发布一些总结先人的DELPHI基础开发技巧,欢迎大家有机会也补充(1分)

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先人的DELPHI基础开发技巧
整理:房客 来源:大富翁论坛
◇[DELPHI]网络邻居复制文件
uses shellapi;
copyfile(pchar('newfile.txt'),pchar('//computername/direction/targer.txt'),false);
◇[DELPHI]产生鼠标拖动效果
通过MouseMove事件、DragOver事件、EndDrag事件实现,例如在PANEL上的LABEL:
var xpanel,ypanel,xlabel,ylabel:integer;
PANEL的MouseMove事件:xpanel:=x;ypanel:=y;
PANEL的DragOver事件:xpanel:=x;ypanel:=y;
LABEL的MouseMove事件:xlabel:=x;ylabel:=y;
LABEL的EndDrag事件:label.left:=xpanel-xlabel;label.top:=ypanel-ylabel;
◇[DELPHI]取得WINDOWS目录
uses shellapi;
var windir:array[0..255] of char;
getwindowsdirectory(windir,sizeof(windir));
或者从注册表中读取,位置:
HKEY_LOCAL_MACHINE/Software/Microsoft/Windows/CurrentVersion
SystemRoot键,取得如:C:/WINDOWS
◇[DELPHI]在FORM或其他容器上画线
var x,y:array [0..50] of integer;
canvas.pen.color:=clred;
canvas.pen.style:=psDash;
form1.canvas.moveto(trunc(x),trunc(y));
form1.canvas.lineto(trunc(x[j]),trunc(y[j]));
◇[DELPHI]字符串列表使用
var tips:tstringlist;
tips:=tstringlist.create;
tips.loadfromfile('filename.txt');
edit1.text:=tips[0];
tips.add('last line addition string');
tips.insert(1,'insert string at NO 2 line');
tips.savetofile('newfile.txt');
tips.free;
◇[DELPHI]简单的剪贴板操作
richedit1.selectall;
richedit1.copytoclipboard;
richedit1.cuttoclipboard;
edit1.pastefromclipboard;
◇[DELPHI]关于文件、目录操作
Chdir('c:/abcdir');转到目录
Mkdir('dirname');建立目录
Rmdir('dirname');删除目录
GetCurrentDir;//取当前目录名,无'/'
Getdir(0,s);//取工作目录名s:='c:/abcdir';
Deletfile('abc.txt');//删除文件
Renamefile('old.txt','new.txt');//文件更名
ExtractFilename(filelistbox1.filename);//取文件名
ExtractFileExt(filelistbox1.filename);//取文件后缀
◇[DELPHI]处理文件属性
attr:=filegetattr(filelistbox1.filename);
if (attr and faReadonly)=faReadonly then
... //只读
if (attr and faSysfile)=faSysfile then
... //系统
if (attr and faArchive)=faArchive then
... //存档
if (attr and faHidden)=faHidden then
... //隐藏
◇[DELPHI]执行程序外文件
WINEXEC//调用可执行文件
winexec('command.com /c copy *.* c:/',SW_Normal);
winexec('start abc.txt');
ShellExecute或ShellExecuteEx//启动文件关联程序
function executefile(const filename,params,defaultDir:string;showCmd:integer):THandle;
ExecuteFile('C:/abc/a.txt','x.abc','c:/abc/',0);
ExecuteFile('http://tingweb.yeah.net','','',0);
ExecuteFile('mailto:tingweb@wx88.net','','',0);
◇[DELPHI]取得系统运行的进程名
var hCurrentWindow:HWnd;szText:array[0..254] of char;
begin
hCurrentWindow:=Getwindow(handle,GW_HWndFrist);
while hCurrentWindow <> 0do
begin
if Getwindowtext(hcurrnetwindow,@sztext,255)>0 then
listbox1.items.add(strpas(@sztext));
hCurrentWindow:=Getwindow(hCurrentwindow,GW_HWndNext);
end;
end;

◇[DELPHI]关于汇编的嵌入
Asm end;
可以任意修改EAX、ECX、EDX;不能修改ESI、EDI、ESP、EBP、EBX。
◇[DELPHI]关于类型转换函数
FloatToStr//浮点转字符串
FloatToStrF//带格式的浮点转字符串
IntToHex//整数转16进制
TimeToStr
DateToStr
DateTimeToStr
FmtStr//按指定格式输出字符串
FormatDateTime('YYYY-MM-DD,hh-mm-ss',DATE);
◇[DELPHI]字符串的过程和函数
Insert(obj,target,pos);//字符串target插入在pos的位置。如插入结果大于target最大长度,多出字符将被截掉
。如Pos在255以外,会产生运行错。例如,st:='Brian',则Insert('OK',st,2)会使st变为'BrOKian'。
Delete(st,pos,Num);//从st串中的pos(整型)位置开始删去个数为Num(整型)个字符的子字串。例
如,st:='Brian',则Delete(st,3,2)将变为Brn。
Str(value,st);//将数值value(整型或实型)转换成字符串放在st中。例如,a=2.5E4时,则str(a:10,st)将使st的
值为' 25000'。
Val(st,var,code);//把字符串表达式st转换为对应整型或实型数值,存放在var中。St必须是一个表示数值的字符
串,并符合数值常数的规则。在转换过程中,如果没有检测出错误,变量code置为0,否则置为第一个出错字
符的位置。例如,st:=25.4E3,x是一个实型变量,则val(st,x,code)将使X值为25400,code值为0。
Copy(st.pos.num);//返回st串中一个位置pos(整型)处开始的,含有num(整型)个字符的子串。如果pos大
于st字符串的长度,那就会返回一个空串,如果pos在255以外,会引起运行错误。例
如,st:='Brian',则Copy(st,2,2)返回'ri'。
Concat(st1,st2,st3……,stn);//把所有自变量表示出的字符串按所给出的顺序连接起来,并返回连接后的值。如
果结果的长度255,将产生运行错误。例如,st1:='Brian',st2:=' ',st3:='Wilfred',则Concat(st1,st2,st3)返
回'Brian Wilfred'。
Length(st);//返回字符串表达式st的长度。例如,st:='Brian',则Length(st)返回值为5。
Pos(obj,target);//返回字符串obj在目标字符串target的第一次出现的位置,如果target没有匹配的串,Pos函数
的返回值为0。例如,target:='Brian Wilfred',则Pos('Wil',target)的返回值是7,Pos('hurbet',target)的返回值
是0。
◇[DELPHI]关于处理注册表
uses Registry;
var reg:Tregistry;
reg:=Tregistry.create;
reg.rootkey:='HKey_Current_User';
reg.openkey('Control Panel/Desktop',false);
reg.WriteString('Title Wallpaper','0');
reg.writeString('Wallpaper',filelistbox1.filename);
reg.closereg;
reg.free;
◇[DELPHI]关于键盘常量名
VK_BACK/VK_TAB/VK_RETURN/VK_SHIFT/VK_CONTROL/VK_MENU/VK_PAUSE/VK_ESCAPE
/VK_SPACE/VK_LEFT/VK_RIGHT/VK_UP/VK_DOWN
F1--F12:$70(112)--$7B(123)
A-Z:$41(65)--$5A(90)
0-9:$30(48)--$39(57)
◇[DELPHI]初步判断程序母语
DELPHI软件的DOS提示:This Program Must Be Run Under Win32.
VC++软件的DOS提示:This Program Cannot Be Run Indo
S Mode.
◇[DELPHI]操作Cookie
response.cookies("name").domain:='http://www.086net.com';
with response.cookies.adddo
begin
name:='username';
value:='username';
end
◇[DELPHI]增加到文档菜单连接
uses shellapi,shlOBJ;
shAddToRecentDocs(shArd_path,pchar(filepath));//增加连接
shAddToRecentDocs(shArd_path,nil);//清空
◇[杂类]备份智能ABC输入法词库
windows/system/user.rem
windows/system/tmmr.rem
◇[DELPHI]判断鼠标按键
if GetAsyncKeyState(VK_LButton)<>0 then
... //左键
if GetAsyncKeyState(VK_MButton)<>0 then
... //中键
if GetAsyncKeyState(VK_RButton)<>0 then
... //右键
◇[DELPHI]设置窗体的最大显示
onFormCreate事件
self.width:=screen.width;
self.height:=screen.height;
◇[DELPHI]按键接受消息
OnCreate事件中处理:Application.OnMessage:=MyOnMessage;
procedure TForm1.MyOnMessage(var MSG:TMSG;var Handle:Boolean);
begin
if msg.message=256 then
... //ANY键
if msg.message=112 then
... //F1
if msg.message=113 then
... //F2
end;

◇[杂类]隐藏共享文件夹
共享效果:可访问,但不可见(在资源管理、网络邻居中)
取共享名为:direction$
访问://computer/dirction/
◇[Java Script]Java Script网页常用效果
网页60秒定时关闭
<script language="java script"><!--
settimeout('window.close();',60000)
--></script>
关闭窗口
<a href="/" onclick="javascript:window.close();return false;">关闭</a>
定时转URL
<meta http-equiv="refresh" content="40;url=http://www.086net.com">
设为首页
<a
onclick="this.style.behavior='url(#default#homepage)';this.sethomepage('http://086net.com');"href="#">设
为首页</a>
收藏本站
<a href="javascript:window.external.addfavorite('http://086net.com','[未名码头]')">收藏本站</a>
加入频道
<a href="javascript:window.external.addchannel('http://086net.com')">加入频道</a>
◇[DELPHI]文本编辑相关
checkbox1.checked:=not checkbox1.checked;
if checkbox1.checked then
richedit1.font.style:=richedit1.font.style+[fsBold] else

richedit1.font.style:=richedit1.font.style-[fsBold]//粗体
if checkbox1.checked then
richedit1.font.style:=richedit1.font.style+[fsItalic] else

richedit1.font.style:=richedit1.font.style-[fsItalic]//斜体
if checkbox1.checked then
richedit1.font.style:=richedit1.font.style+[fsUnderline] else

richedit1.font.style:=richedit1.font.style-[fsUnderline]//下划线
memo1.alignment:=taLeftJustify;//居左
memo1.alignment:=taRightJustify;//居右
memo1.alignment:=taCenter;//居中
◇[DELPHI]随机产生文本色
randomize;//随机种子
memo1.font.color:=rgb(random(255),random(255),random(255));
◇[DELPHI]DELPHI5 UPDATE升级补丁序列号
1000003185
90X25fx0
◇[DELPHI]文件名的非法字符过滤
for i:=1 to length(s)do
if s in ['/','/',':','*','?','<','>','|'] then

◇[DELPHI]转换函数的定义及说明
datetimetofiledate (datetime:Tdatetime):longint;
将Tdatetime格式的日期时间值转换成DOS格式的日期时间值
datetimetostr (datetime:Tdatetime):string;
将Tdatatime格式变量转换成字符串,如果datetime参数不包含日期
值,返回字符串日期显示成为00/00/00,如果datetime参数中没有时间值,返回字符串中的时间部分显示成为
00:00:00 AM
datetimetostring (var result string;
const format:string;
datetime:Tdatetime);
根据给定的格式字符串转换时间和日期值,result为结果字符串,format为转换格式字符
串,datetime为日期时间值
datetostr (date:Tdatetime) 使用shortdateformat全局变量定义的格式字符串将date参数转换成对应的字符串
floattodecimal (var result:Tfloatrec;value:
extended;precision,decimals:
integer);
将浮点数转换成十进制表示
floattostr (value:extended):string 将浮点数value转换成字符串格式,该转换使用普通数字格式,转换的有效位
数为15位。
floattotext (buffer:pchar;value:extended;
format:Tfloatformat;precision,
digits:integer):integer;
用给定的格式、精度和小数将浮点值value转换成十进制表示形式,转换结果存放
于buffer参数中,函数返回值为存储到buffer中的字符位数,buffer是非0结果的字符串缓冲区。
floattotextfmt (buffer:pchar;value:extended;
format:pchar):integer 用给定的格式将浮点值value转换成十进制表示形式,转换结果存放于buffer参数中,函
数返回值为存储到buffer中的字符位数。
inttohex (value:longint;digits:integer):
string;
将给定的数值value转换成十六进制的字符串。参数digits给出转换结果字符串包含的数字位数。
inttostr (value:longint):string 将整数转换成十进制形式字符串
strtodate (const S:string):Tdatetime 将字符串转换成日期值,S必须包含一个合法的格式日期的字符串。
strtodatetime (const S:string):Tdatetime 将字符串S转换成日期时间格式,S必须具有MM/DD/YY
HH:MM:SS[AM|PM]格式,其中日期和时间分隔符与系统时期时间常量设置相关。如果没有指定AM或PM信息
,表示使用24小时制。
strtofloat (const S:string):extended;
将给定的字符串转换成浮点数,字符串具有如下格式:
[+|-]nnn…[.]nnn…[<+|-><E|e><+|->nnnn]
strtoint (const S:string):longint 将数字字符串转换成整数,字符串可以是十进制或十六进制格式,如果字符串
不是一个合法的数字字符串,系统发生ECONVERTERROR异常
strtointdef (const S:string;default:
longint):longint;
将字符串S转换成数字,如果不能将S转换成数字,strtointdef函数返回参数default的值。
strtotime (const S:string):Tdatetime 将字符串S转换成TDATETIME值,S具有HH:MM:SS[AM|PM]格式,实际
的格式与系统的时间相关的全局变量有关。
timetostr (time:Tdatetime):string;
将参数TIME转换成字符串。转换结果字符串的格式与系统的时间相关常量的
设置有关。
◇[DELPHI]程序不出现在ALT+CTRL+DEL
在implementation后添加声明:
function RegisterServiceProcess(dwProcessID, dwType: Integer): Integer;
stdcall;
external 'KERNEL32.DLL';
RegisterServiceProcess(GetCurrentProcessID, 1);//隐藏
RegisterServiceProcess(GetCurrentProcessID, 0);//显示
用ALT+DEL+CTRL看不见
◇[DELPHI]程序不出现在任务栏
uses windows
var
ExtendedStyle : Integer;
begin
Application.Initialize;
//==============================================================
ExtendedStyle := GetWindowLong (Application.Handle, GWL_EXSTYLE);
SetWindowLong(Application.Handle, GWL_EXSTYLE, ExtendedStyle OR WS_EX_TOOLWINDOW
AND NOT WS_EX_APPWINDOW);
//===============================================================
Application.CreateForm(TForm1, Form1);
Application.Run;
end.

◇[DELPHI]如何判断拨号网络是开还是关
if GetSystemMetrics(SM_NETWORK) AND $01 = $01 then

showmessage('在线!')
else
showmessage('不在线!');
◇[DELPHI]实现IP到域名的转换
function GetDomainName(Ip:string):string;
var
pH:PHostent;
data:twsadata;
ii:dword;
begin
WSAStartup($101, Data);
ii:=inet_addr(pchar(ip));
pH:=gethostbyaddr(@ii,sizeof(ii),PF_INET);
if (ph<>nil) then
result:=pH.h_name
else

result:='';
WSACleanup;
end;

◇[DELPHI]处理“右键菜单”方法
var
reg: TRegistry;
begin
reg := TRegistry.Create;
reg.RootKey:=HKEY_CLASSES_ROOT;
reg.OpenKey('*/shell/check/command', true);
reg.WriteString('', '"' + application.ExeName + '" "%1"');
reg.CloseKey;
reg.OpenKey('*/shell/diary', false);
reg.WriteString('', '操作(&amp;C)');
reg.CloseKey;
reg.Free;
showmessage('DONE!');
end;

◇[DELPHI]发送虚拟键值ctrl V
procedure sendpaste;
begin
keybd_event(VK_Control, MapVirtualKey(VK_Control, 0), 0, 0);
keybd_event(ord('V'), MapVirtualKey(ord('V'), 0), 0, 0);
keybd_event(ord('V'), MapVirtualKey(ord('V'), 0), KEYEVENTF_KEYUP, 0);
keybd_event(VK_Control, MapVirtualKey(VK_Control, 0), KEYEVENTF_KEYUP, 0);
end;

◇[DELPHI]当前的光驱的盘符
procedure getcdrom(var cd:char);
var
str:string;
drivers:integer;
driver:char;
i,temp:integer;
begin
drivers:=getlogicaldrives;
temp:=(1 and drivers);
for i:=0 to 26do
begin
if temp=1 then
begin
driver:=char(i+integer('a'));
str:=driver+':';
if getdrivetype(pchar(str))=drive_cdrom then
begin
cd:=driver;
exit;
end;
end;
drivers:=(drivers shr 1);
temp:=(1 and drivers);
end;
end;

◇[DELPHI]字符的加密与解密
function cryptstr(const s:string;
stype: dword):string;
var
i: integer;
fkey: integer;
begin
result:='';
case stype of
0: setpass;
begin
randomize;
fkey := random($ff);
for i:=1 to length(s)do
result := result+chr( ord(s) xor i xor fkey);
result := result + char(fkey);
end;
1: getpass
begin
fkey := ord(s[length(s)]);
for i:=1 to length(s) - 1do
result := result+chr( ord(s) xor i xor fkey);
end;
end;

□◇[DELPHI]向其他应用程序发送模拟键
var
h: THandle;
begin
h := FindWindow(nil, '应用程序标题');
PostMessage(h, WM_KEYDOWN, VK_F9, 0);//发送F9键
end;

□◇[DELPHI]DELPHI 支持的DAO数据格式
td.Fields.Append(td.CreateField ('dbBoolean',dbBoolean,0));
td.Fields.Append(td.CreateField ('dbByte',dbByte,0));
td.Fields.Append(td.CreateField ('dbInteger',dbInteger,0));
td.Fields.Append(td.CreateField ('dbLong',dbLong,0));
td.Fields.Append(td.CreateField ('dbCurrency',dbCurrency,0));
td.Fields.Append(td.CreateField ('dbSingle',dbSingle,0));
td.Fields.Append(td.CreateField ('dbDouble',dbDouble,0));
td.Fields.Append(td.CreateField ('dbDate',dbDate,0));
td.Fields.Append(td.CreateField ('dbBinary',dbBinary,0));
td.Fields.Append(td.CreateField ('dbText',dbText,0));
td.Fields.Append(td.CreateField ('dbLongBinary',dbLongBinary,0));
td.Fields.Append(td.CreateField ('dbMemo',dbMemo,0));
td.Fields['ID'].Set_Attributes(dbAutoIncrField);//自增字段
□◇[DELPHI]DELPHI配置MS SQL 7和BDE步骤
第一步,配置ODBC:
先在ODBC 中设数据源,安装过SQL Server7.0 后,ODBC中有一项"系统DSN"应该有两项
数据源,一个是MQIS,一个是LocalSever,任选一个选后点击配置按钮,不知你的SQL7.0
是不是安装在本地机器上,如果是的话直接进行下一步,如果不是,在服务器一栏中填上
Server,然后进行下一步,填写登录ID 和密码(登录ID,和密码是在SQL7.0中的用户选项
中设的)。
第二步,配置BDE:
打开Delphi的BDE,然后点击MQIS 或 LocalServer,就会提示用户名和密码,这和
ODBC的用户名和密码是一样的,填上就行了。
第三步,配置程序:
如果用的是TTable,就在TTable的DatabaseName中选择MQIS 或LocalServer,然后在
TableName中选择Sale就行了,然后将Active改为True,Delphi弹出提示对话,填入用户
名和密码。
如果用的是TQuery,在TQuery上点击右键,再击"SQL Builder",这是以界面方式配置
SQL语句,或者在TQuery的SQL中填入SQL语句。最后,别忘了将Active改为True。
在运行也可能配置TQuery,具体见Delphi帮助。
□◇[DELPHI]得到图像上某一点的RGB值
procedure TForm1.Image1MouseDown(Sender: TObject;
Button: TMouseButton;
Shift: TShiftState;
X, Y: Integer);
var
red,green,blue:byte ;
i:integer;
begin
i:= image1.Canvas.Pixels[x,y];
Blue:= GetBValue(i);
Green:= GetGValue(i):
Red:= GetRValue(i);
Label1.Caption:=inttostr(Red);
Label2.Caption:=inttostr(Green);
Label3.Caption:=inttostr(Blue);
end;

□◇[DELPHI]关于日期格式分解转换
var year,month,day:word;now2:Tdatatime;
now2:=date();
decodedate(now2,year,month,day);
lable1.Text :=inttostr(year)+'年'+inttostr(month)+'月'+inttostr(day)+'日';

◇[DELPHI]如何判断当前网络连接方式
判断结果是MODEM、局域网或是代理服务器方式。
uses wininet;
Function ConnectionKind :boolean;
var flags: dword;
begin

Result := InternetGetConnectedState(@flags, 0);
if Result then

begin

if (flags and INTERNET_CONNECTION_MODEM) = INTERNET_CONNECTION_MODEM then

begin

showmessage('Modem');
end;

if (flags and INTERNET_CONNECTION_LAN) = INTERNET_CONNECTION_LAN then

begin

showmessage('LAN');
end;

if (flags and INTERNET_CONNECTION_PROXY) = INTERNET_CONNECTION_PROXY then

begin

showmessage('Proxy');
end;

if (flags and INTERNET_CONNECTION_MODEM_BUSY)=INTERNET_CONNECTION_MODEM_BUSY then

begin

showmessage('Modem Busy');
end;

end;

end;

◇[DELPHI]如何判断字符串是否是有效EMAIL地址
function IsEMail(EMail: String): Boolean;
var s: String;ETpos: Integer;
begin

ETpos:= pos('@', EMail);
if ETpos > 1 then

begin

s:= copy(EMail,ETpos+1,Length(EMail));
if (pos('.', s) > 1) and (pos('.', s) < length(s)) then

Result:= true else
Result:= false;
end
else

Result:= false;
end;

◇[DELPHI]判断系统是否连接INTERNET
需要引入URL.DLL中的InetIsOffline函数。
函数申明为:
function InetIsOffline(Flag: Integer): Boolean;
stdcall;
external 'URL.DLL';
然后就可以调用函数判断系统是否连接到INTERNET
if InetIsOffline(0) then
ShowMessage('not connected!')
else
ShowMessage('connected!');
该函数返回TRUE如果本地系统没有连接到INTERNET。
附:
大多数装有IE或OFFICE97的系统都有此DLL可供调用。
InetIsOffline
BOOL InetIsOffline(
DWORD dwFlags,
);
◇[DELPHI]简单地播放和暂停WAV文件
uses mmsystem;
function PlayWav(const FileName: string): Boolean;
begin

Result := PlaySound(PChar(FileName), 0, SND_ASYNC);
end;

procedure StopWav;
var
buffer: array[0..2] of char;
begin

buffer[0] := #0;
PlaySound(Buffer, 0, SND_PURGE);
end;

◇[DELPHI]取机器BIOS信息
with Memo1.Linesdo

begin

Add('MainBoardBiosName:'+^I+string(Pchar(Ptr($FE061))));
Add('MainBoardBiosCopyRight:'+^I+string(Pchar(Ptr($FE091))));
Add('MainBoardBiosDate:'+^I+string(Pchar(Ptr($FFFF5))));
Add('MainBoardBiosSerialNo:'+^I+string(Pchar(Ptr($FEC71))));
end;

◇[DELPHI]网络下载文件
uses UrlMon;
functiondo
wnloadFile(Source, Dest: string): Boolean;
begin

try
Result := UrlDownloadToFile(nil, PChar(source), PChar(Dest), 0, nil) = 0;
except
Result := False;
end;

end;

ifdo
wnloadFile('http://www.borland.com/delphi6.zip, 'c:/kylix.zip') then

ShowMessage('Download succesful')
else
ShowMessage('Download unsuccesful')
◇[DELPHI]解析服务器IP地址
uses winsock
function IPAddrToName(IPAddr : String): String;
var
SockAddrIn: TSockAddrIn;
HostEnt: PHostEnt;
WSAData: TWSAData;
begin

WSAStartup($101, WSAData);
SockAddrIn.sin_addr.s_addr:= inet_addr(PChar(IPAddr));
HostEnt:= gethostbyaddr(@SockAddrIn.sin_addr.S_addr, 4, AF_INET);
if HostEnt<>nil then
result:=StrPas(Hostent^.h_name) else
result:='';
end;

◇[DELPHI]取得快捷方式中的连接
function ExeFromLink(const linkname: string): string;
var
FDir,
FName,
ExeName: PChar;
z: integer;
begin

ExeName:= StrAlloc(MAX_PATH);
FName:= StrAlloc(MAX_PATH);
FDir:= StrAlloc(MAX_PATH);
StrPCopy(FName, ExtractFileName(linkname));
StrPCopy(FDir, ExtractFilePath(linkname));
z:= FindExecutable(FName, FDir, ExeName);
if z > 32 then

Result:= StrPas(ExeName)
else

Result:= '';
StrDispose(FDir);
StrDispose(FName);
StrDispose(ExeName);
end;

◇[DELPHI]控制TCombobox的自动完成
{'Sorted' property of the TCombobox to true }
var lastKey: Word;
//全局变量
//TCombobox的OnChange事件
procedure TForm1.AutoCompleteChange(Sender: TObject);
var
SearchStr: string;
retVal: integer;
begin

SearchStr := (Sender as TCombobox).Text;
if lastKey <> VK_BACK then
// backspace: VK_BACK or $08
begin

retVal := (Sender as TCombobox).Perform(CB_FINDSTRING, -1, LongInt(PChar(SearchStr)));
if retVal > CB_Err then

begin

(Sender as TCombobox).ItemIndex := retVal;
(Sender as TCombobox).SelStart := Length(SearchStr);
(Sender as TCombobox).SelLength :=
(Length((Sender as TCombobox).Text) - Length(SearchStr));
end;
// retVal > CB_Err
end;
// lastKey <> VK_BACK
lastKey := 0;
// reset lastKey
end;

//TCombobox的OnKeyDown事件
procedure TForm1.AutoCompleteKeyDown(Sender: TObject;
var Key: Word;
Shift: TShiftState);
begin

lastKey := Key;
end;

◇[DELPHI]如何清空一个目录
function EmptyDirectory(TheDirectory :String ;
Recursive : Boolean) :
Boolean;
var
SearchRec : TSearchRec;
Res : Integer;
begin
Result := False;
TheDirectory := NormalDir(TheDirectory);
Res := FindFirst(TheDirectory + '*.*', faAnyFile, SearchRec);
try
while Res = 0do
begin
if (SearchRec.Name <> '.') and (SearchRec.Name <> '..') then
begin
if ((SearchRec.Attr and faDirectory) > 0) and Recursive
then
begin
EmptyDirectory(TheDirectory + SearchRec.Name, True);
RemoveDirectory(PChar(TheDirectory + SearchRec.Name));
end
else
begin
DeleteFile(PChar(TheDirectory + SearchRec.Name))
end;
end;
Res := FindNext(SearchRec);
end;
Result := True;
finally
FindClose(SearchRec.FindHandle);
end;
end;

◇[DELPHI]如何计算一个目录的大小
function GetDirectorySize(const ADirectory: string): Integer;
var
Dir: TSearchRec;
Ret: integer;
Path: string;
begin
Result := 0;
Path := ExtractFilePath(ADirectory);
Ret := Sysutils.FindFirst(ADirectory, faAnyFile, Dir);
if Ret <> NO_ERROR then
exit;
try
while ret=NO_ERRORdo
begin
inc(Result, Dir.Size);
if (Dir.Attr in [faDirectory]) and (Dir.Name[1] <> '.') then
Inc(Result, GetDirectorySize(Path + Dir.Name + '/*.*'));
Ret := Sysutils.FindNext(Dir);
end;
finally
Sysutils.FindClose(Dir);
end;
end;

◇[DELPHI]安装程序如何添加到Uninstall列表
操作注册表,如下:
1.在HKEY_LOCAL_MACHINE/SOFTWARE/Microsoft/Windows/CurrentVersion/Uninstall键下建立一个主键,名
称任意。
例HKEY_LOCAL_MACHINE/SOFTWARE/Microsoft/Windows/CurrentVersion/Uninstall/MyUninstall
2.在HKEY_LOCAL_MACHINE/SOFTWARE/Microsoft/Windows/CurrentVersion/Uninstall/MyUnistall下键两个串值

这两个串值的名称是特定的:DisplayName和UninstallString。
3.给串DisplayName赋值为显示在“删除应用程序列表”中的名称,如'Aiming Uninstall one';
给串UninstallString赋值为执行的删除命令,如 C:/WIN97/uninst.exe -f"C:/TestPro/aimTest.isu"
◇[DELPHI]截获WM_QUERYENDSESSION关机消息
type
TForm1 = class(TForm)
procedure WMQueryEndSession(var Message: TWMQueryEndSession);
message WM_QUERYENDSESSION;
procedure CMEraseBkgnd(var Message:TWMEraseBkgnd);Message WM_ERASEBKGND;
private
{ Private declarations }
public
{ Public declarations }
end;

procedure TForm1.WMQueryEndSession(var Message: TWMQueryEndSession);
begin
Showmessage('computer is about to shutdo
wn');
end;

◇[DELPHI]获取网上邻居
procedure getnethood();//NT做服务器,WIN98上调试通过。
var
a,i:integer;
errcode:integer;
netres:array[0..1023] of netresource;
enumhandle:thandle;
enumentries:dword;
buffersize:dword;
s:string;
mylistitems:tlistitems;
mylistitem:tlistitem;
alldomain:tstrings;
begin
//listcomputer is a listview to list all computers;controlcenter is a form.
alldomain:=tstringlist.Create ;
with netres[0]do
begin
dwscope :=RESOURCE_GLOBALNET;
dwtype :=RESOURCETYPE_ANY;
dwdisplaytype :=RESOURCEDISPLAYTYPE_DOMAIN;
dwusage :=RESOURCEUSAGE_CONTAINER;
lplocalname :=nil;
lpremotename :=nil;
lpcomment :=nil;
lpprovider :=nil;
end;
// 获取所有的域
errcode:=wnetopenenum(RESOURCE_GLOBALNET,RESOURCETYPE_ANY,RESOURCEUSAGE_CONTAINER,@
netres[0],enumhandle);
if errcode=NO_ERROR then
begin
enumentries:=1024;
buffersize:=sizeof(netres);
errcode:=wnetenumresource(enumhandle,enumentries,@netres[0],buffersize);
end;
a:=0;
mylistitems :=controlcenter.lstcomputer.Items ;
mylistitems.Clear ;
while (string(netres[a].lpprovider)<>'') and (errcode=NO_ERROR)do
begin
alldomain.Add (netres[a].lpremotename);
a:=a+1;
end;
wnetcloseenum(enumhandle);
// 获取所有的计算机
mylistitems :=controlcenter.lstcomputer.Items ;
mylistitems.Clear ;
for i:=0 to alldomain.Count-1do
begin
with netres[0]do
begin
dwscope :=RESOURCE_GLOBALNET;
dwtype :=RESOURCETYPE_ANY;
dwdisplaytype :=RESOURCEDISPLAYTYPE_SERVER;
dwusage :=RESOURCEUSAGE_CONTAINER;
lplocalname :=nil;
lpremotename :=pchar(alldomain);
lpcomment :=nil;
lpprovider :=nil;
end;
ErrCode:=WNetOpenEnum(RESOURCE_GLOBALNET,RESOURCETYPE_ANY,RESOURCEUSAGE_CONTAINER,
@netres[0],EnumHandle);
if errcode=NO_ERROR then
begin
EnumEntries:=1024;
BufferSize:=SizeOf(NetRes);
ErrCode:=WNetEnumResource(EnumHandle,EnumEntries,@NetRes[0],BufferSize);
end;
a:=0;
while (string(netres[a].lpprovider)<>'') and (errcode=NO_ERROR)do
begin
mylistitem :=mylistitems.Add ;
mylistitem.ImageIndex :=0;
mylistitem.Caption :=uppercase(stringreplace(string(NetRes[a].lpremotename),'//','',[rfReplaceAll]));
a:=a+1;
end;
wnetcloseenum(enumhandle);
end;
end;

◇[DELPHI]获取某一计算机上的共享目录
procedure getsharefolder(const computername:string);
var
errcode,a:integer;
netres:array[0..1023] of netresource;
enumhandle:thandle;
enumentries,buffersize:dword;
s:string;
mylistitems:tlistitems;
mylistitem:tlistitem;
mystrings:tstringlist;
begin
with netres[0]do
begin
dwscope :=RESOURCE_GLOBALNET;
dwtype :=RESOURCETYPE_DISK;
dwdisplaytype :=RESOURCEDISPLAYTYPE_SHARE;
dwusage :=RESOURCEUSAGE_CONTAINER;
lplocalname :=nil;
lpremotename :=pchar(computername);
lpcomment :=nil;
lpprovider :=nil;
end;
// 获取根结点
errcode:=wnetopenenum(RESOURCE_GLOBALNET,RESOURCETYPE_DISK,RESOURCEUSAGE_CONTAINER,
@netres[0],enumhandle);
if errcode=NO_ERROR then
begin
EnumEntries:=1024;
BufferSize:=SizeOf(NetRes);
ErrCode:=WNetEnumResource(EnumHandle,EnumEntries,@NetRes[0],BufferSize);
end;
wnetcloseenum(enumhandle);
a:=0;
mylistitems:=controlcenter.lstfile.Items ;
mylistitems.Clear ;
while (string(netres[a].lpprovider)<>'') and (errcode=NO_ERROR)do
begin
with mylistitemsdo
begin
mylistitem:=add;
mylistitem.ImageIndex :=4;
mylistitem.Caption :=extractfilename(netres[a].lpremotename);
end;
a:=a+1;
end;
end;

◇[DELPHI]得到硬盘序列号
var SerialNum : pdword;
a, b : dword;
Buffer : array [0..255] of char;
begin

if GetVolumeInformation('c:/', Buffer, SizeOf(Buffer), SerialNum, a, b, nil, 0) then
Label1.Caption :=
IntToStr(SerialNum^);
end;

◇[DELPHI]MEMO的自动翻页
Procedure ScrollMemo(Memo : TMemo;
Direction : char);
begin

case direction of
'd': begin

SendMessage(Memo.Handle, { HWND of the Memo Control }
WM_VSCROLL, { Windows Message }
SB_PAGEDOWN, { Scroll Command }
0) { Not Used }
end;

'u' : begin

SendMessage(Memo.Handle, { HWND of the Memo Control }
WM_VSCROLL, { Windows Message }
SB_PAGEUP, { Scroll Command }
0);
{ Not Used }
end;

end;

end;

procedure TForm1.Button1Click(Sender: TObject);
begin

ScrollMemo(Memo1,'d');
//上翻页
end;

procedure TForm1.Button1Click(Sender: TObject);
begin

ScrollMemo(Memo1,'u');
//下翻页
end;

◇[DELPHI]DBGrid中回车到下个位置(Tab键)
procedure TForm1.DBGrid1KeyPress(Sender: TObject;
var Key: Char);
begin
if Key = #13 then
if DBGrid1.Columns.Grid.SelectedIndex < DBGrid1.Columns.Count - 1 then
DBGrid1.Columns[DBGrid1.Columns.grid.SelectedIndex + 1].Field.FocusControl
else
begin

Table1.next;
DBGrid1.Columns[0].field.FocusControl;
end;
end;

◇[DELPHI]如何安装控件
安装方法:
1.对于单个控件,Component-->install component..-->PAS或DCU文件-->install
2.对于带*.dpk文件的控件包,File-->open(下拉列表框中选*.dpk)-->install即可.
3.对于带*.dpl文件的控件包,Install Packages-->Add-->dpl文件名即可。
4.如果以上Install按钮为失效的话,试试Compile按钮。
5.是run time lib则在option下的packages下的runtimepackes加之.
如果编译时提示文件找不到的话,一般是控件的安装目录不在delphi的Lib目录中,有两种方法可以解决:
1.把安装的原文件拷入到delphi的Lib目录下。
2.或者Tools-->Environment Options中把控件原代码路径加入到Delphi的Lib目录中即可。
◇[DELPHI]目录完全删除(deltree)
procedure TForm1.DeleteDirectory(strDir:String);
var
sr: TSearchRec;
FileAttrs: Integer;
strfilename:string;
strPth:string;
begin

strpth:=Getcurrentdir();
FileAttrs := faAnyFile;
if FindFirst(strpth+'/'+strdir+'/*.*', FileAttrs, sr) = 0 then

begin

if (sr.Attr and FileAttrs) = sr.Attr then

begin

strfilename:=sr.Name;
if fileexists(strpth+'/'+strdir+'/'+strfilename) then

deletefile(strpth+'/'+strdir+'/'+strfilename);
end;

while FindNext(sr) = 0do

begin

if (sr.Attr and FileAttrs) = sr.Attr then

begin

strfilename:=sr.name;
if fileexists(strpth+'/'+strdir+'/'+strfilename) then

deletefile(strpth+'/'+strdir+'/'+strfilename);
end;

end;

FindClose(sr);
removedir(strpth+'/'+strdir);
end;

end;

◇[DELPHI]取得TMemo 控件当前光标的行和列信息到Tpoint中
1.function ReadCursorPos(SourceMemo: TMemo): TPoint;
var Point: TPoint;
begin

 point.y := SendMessage(SourceMemo.Handle,EM_LINEFROMCHAR,SourceMemo.SelStart,0);
 point.x := SourceMemo.SelStart-SendMessage(SourceMemo.Handle,EM_LINEINDEX,point.y,0);
 Result := Point;
end;

2.LineLength:=SendMessage(memol.handle,EM—LINELENGTH,Cpos,0);//行长
◇[DELPHI]读硬盘序列号
function GetDiskSerial(DiskChar: Char): string;
var
SerialNum : pdword;
a, b : dword;
Buffer : array [0..255] of char;
begin
result := "";
if GetVolumeInformation(PChar(diskchar+":/"), Buffer, SizeOf(Buffer), SerialNum,
a, b, nil, 0) then
 Result := IntToStr(SerialNum^);
end;

◇[INTERNET]CSS常用综合技巧
1。P:first-letter { font-size: 300%;
float: left }//首字会比普通字体加大三倍。
2。<LINK REL=StyleSheet HREF="basics.css" TITLE="Contemporary">//连接一个外部样式表
3。嵌入一个样式表
<STYLE TYPE="text/css" MEDIA=screen>
<!--
@import url(http://www.htmlhelp.com/style.css);//外部导入一个样式表
@import url(/stylesheets/punk.css);//同上
BODY { background: url(foo.gif) red;
color: black }
.punk { color: lime;
background: #ff80c0 }//引用见5。
#wdg97 { font-size: larger }//引用见6。
-->
</STYLE>
4。<P STYLE="color: red;
font-family: 'New Century Schoolbook', serif"> //内联样式
<SPAN STYLE="font-family: Arial">Arial</SPAN>//SPAN接受STYLE、CLASS和ID属性
<DIV CLASS=note><P>DIV可以包含段落、标题、表格甚至其它部分</P></DIV>
5。<H1 CLASS=punk>CLASS属性</H1>//定义见3。
6。<P ID=wdg97>ID属性</P>//定义见3。
7。属性列表
字体风格:font-style: [normal | italic | oblique];
字体大小:font-size: [xx-small | x-small | small | medium | large | x-large | xx-large | larger | smaller | <长度>
| <百分比>]
文本修饰:text-decoration:[ underline || overline || line-through || blink ]
文本转换:text-transform:[none | capitalize | uppercase | lowercase]
背景颜色:background-color:[<颜色> | transparent]
背景图象:background-image:[<URLs> | none]
行高:line-height: [normal | <数字> | <长度> | <百分比>]
边框样式:border-style: [ none |do
tted | dashed | solid |do
uble | groove | ridge | inset | outset ]
漂浮:float: [left | right | none]
8。长度单位
相对单位:
em (em,元素的字体的高度)
ex (x-height,字母 "x" 的高度)
px (像素,相对于屏幕的分辨率)
绝对长度:
in (英寸,1英寸=2.54厘米)
cm (厘米,1厘米=10毫米)
mm (米)
pt (点,1点=1/72英寸)
pc (帕,1帕=12点)
◇[DELPHI]VCL制作简要步骤
1.创建部件属性方法事件
(建立库单元,继承为新的类型,添加属性、方法、事件,注册部件,建立包文件)
2.消息处理
3.异常处理
4.部件可视
◇[DELPHI]动态连接库的装载
静态装载:procedure name;external 'lib.dll';
动态装载:var handle:Thandle;
handle:=loadlibrary('lib.dll');
if handle<>0 then
begin
{dosomething}
freelibrary(handle);
end;

◇[DELPHI]指针变量和地址
var x,y:integer;p:^integer;//指向INTEGER变量的指针
x:=10;//变量赋值
p:=@x;//变量x的地址
y:=p^;//为Y赋值指针P
@@procedure//返回过程变量的内存地址
◇[DELPHI]判断字符是汉字的一个字符
ByteType('你好haha吗',1) = mbLeadByte//是第一个字符
ByteType('你好haha吗',2) = mbTrailByte//是第二个字符
ByteType('你好haha吗',5) = mbSingleByte//不是中文字符
◇[DELPHI]memo的定位操作
memo1.lines.delete(0)//删除第1行
memo1.selstart:=10//定位10字节处
◇[DELPHI]获得双字节字符内码
function getit(s: string): integer;
begin
Result := byte(s[1]) * $100 + byte(s[2]);
end;
使用:getit('计')//$bcc6 即十进制 48326
◇[DELPHI]调用ADD数据存储过程
存储过程如下:
create procedure addrecord(
record1 varchar(10)
record2 varchar(20)
)
as
begin
insert into tablename (field1,field2) values(:record1,:record2)
end
执行存储过程:
EXECUTE procedure addrecord("urrecord1","urrecord2")
◇[DELPHI]将文件存到blob字段中
function blobcontenttostring(const filename: string):string;
begin
with tfilestream.create(filename,fmopenread)do
try
setlength(Result,size);
read(Pointer(Result)^,size);
finally
free;
end;
end;
//保存字段
begin
if (opendialog1.execute) then
begin
sFileName:=OpenDialog1.FileName;
adotable1.edit;
adotable1.fieldbyname('visio').asstring:=Blobcontenttostring(FileName);
adotable1.post;
end;

◇[DELPHI]把文件全部复制到剪贴板
uses shlobj,activex,clipbrd;
procedure Tform1.copytoclipbrd(var FileName:string);
var
FE:TFormatEtc;
Medium: TStgMedium;
dropfiles:PDropFiles;
pFile:PChar;
begin
FE.cfFormat := CF_HDROP;
FE.dwAspect := DVASPECT_CONTENT;
FE.tymed := TYMED_HGLOBAL;
Medium.hGlobal := GlobalAlloc(GMEM_SHARE or GMEM_ZEROINIT, SizeOf(TDropFiles)+length(FileName)+1);
if Medium.hGlobal<>0 then
begin
Medium.tymed := TYMED_HGLOBAL;
dropfiles := GlobalLock(Medium.hGlobal);
try
dropfiles^.pfiles := SizeOf(TDropFiles);
dropfiles^.fwide := False;
longint(pFile) := longint(dropfiles)+SizeOf(TDropFiles);
StrPCopy(pFile,FileName);
Inc(pFile, Length(FileName)+1);
pFile^ := #0;
finally
GlobalUnlock(Medium.hGlobal);
end;
Clipboard.SetAsHandle(CF_HDROP,Medium.hGlobal);
end;
end;

◇[DELPHI]列举当前系统运行进程
uses TLHelp32;
procedure TForm1.Button1Click(Sender: TObject);
var lppe: TProcessEntry32;
found : boolean;
Hand : THandle;
begin
Hand := CreateToolhelp32Snapshot(TH32CS_SNAPALL,0);
found := Process32First(Hand,lppe);
while founddo
begin
ListBox1.Items.Add(StrPas(lppe.szExeFile));
found := Process32Next(Hand,lppe);
end;
end;

◇[DELPHI]根据BDETable1建立新表Table2
Table2:=TTable.Create(nil);
try
Table2.DatabaseName:=Table1.DatabaseName;
Table2.FieldDefs.Assign(Table1.FieldDefs);
Table2.IndexDefs.Assign(Table1.IndexDefs);
Table2.TableName:='new_table';
Table2.CreateTable();
finally
Table2.Free();
end;

◇[DELPHI]最菜理解DLL建立和引用
//先看DLL source(FILE-->NEW-->DLL)
library project1;
uses
SysUtils, Classes;
function addit(f:integer;s:integer):integer;export;
begin
makeasum:=f+s;
end;
exports
addit;
end.
//调用(IN ur PROJECT)
implementation
function addit(f:integer;s:integer):integer;far;external 'project1';//申明
{调用就是addit(2,4);结果显示6}
◇[DELPHI]动态读取程序自身大小
function GesSelfSize: integer;
var
f: file of byte;
begin
filemode := 0;
assignfile(f, application.exename);
reset(f);
Result := filesize(f);//单位是字节
closefile(f);
end;

◇[DELPHI]读取BIOS信息
with Memo1.Linesdo

begin

Add('MainBoardBiosName:'+^I+string(Pchar(Ptr($FE061))));
Add('MainBoardBiosCopyRight:'+^I+string(Pchar(Ptr($FE091))));
Add('MainBoardBiosDate:'+^I+string(Pchar(Ptr($FFFF5))));
Add('MainBoardBiosSerialNo:'+^I+string(Pchar(Ptr($FEC71))));
end;

◇[DELPHI]动态建立MSSQL别名
procedure TForm1.Button1Click(Sender: TObject);
var MyList: TStringList;
begin
MyList := TStringList.Create;
try
with MyListdo
begin
Add('SERVER NAME=210.242.86.2');
Add('DATABASE NAME=db');
Add('USER NAME=sa');
end;
Session1.AddAlias('TESTSQL', 'MSSQL', MyList);
//?ミMSSQL??
Session1.SaveConfigFile;
finally
MyList.Free;
Session1.Active:=True;
Database1.DatabaseName:='DB';
Database1.AliasName:='TESTSQL';
Database1.LoginPrompt:=False;
Database1.Params.Add('USER NAME=sa');
Database1.Params.Add('PASSWORD=');
Database1.Connected:=True;
end;
end;

procedure TForm1.Button2Click(Sender: TObject);
begin
Database1.Connected:=False;
Session1.DeleteAlias('TESTSQL');
??
end;

◇[DELPHI]播放背景音乐
uses mmsystem
//播放音乐
MCISendString('OPEN e:/1.MID TYPE SEQUENCER ALIAS NN', '', 0, 0);
MCISendString('PLAY NN FROM 0', '', 0, 0);
MCISendString('CLOSE ANIMATION', '', 0, 0);
end;
//停止播放
MCISendString('OPEN e:/1.MID TYPE SEQUENCER ALIAS NN', '', 0, 0);
MCISendString('STOP NN', '', 0, 0);
MCISendString('CLOSE ANIMATION', '', 0, 0);
◇[DELPHI]接口和类的一个范例代码
Type{接口和类申明:区别在于不能在接口中申明数据成员、任何非公有的方法、公共方法不使用PUBLIC关键
字}
Isample=interface//定义Isample接口
function getstring:string;
end;
Tsample=class(TInterfacedObject,Isample)
public
function getstring:string;
end;
//function定义
function Tsample.getstring:string;
begin
result:='what show is ';
end;
//调用类对象
var sample:Tsample;
begin
sample:=Tsample.create;
showmessage(sample.getstring+'class object!');
sample.free;
end;
//调用接口
var sampleinterface:Isample;
sample:Tsample;
begin
sample:=Tsample.create;
sampleInterface:=sample;//Interface的实现必须使用class
{以上两行也可表达成sampleInterface:=Tsample.create;}
showmessage(sampleInterface.getstring+'Interface!');
//sample.free;{和局部类不同,Interface中的类自动释放}
sampleInterface:=nil;{释放接口对象}
end;

◇[DELPHI]任务条就看不当程序
var
ExtendedStyle : Integer;
begin
Application.Initialize;
ExtendedStyle := GetWindowLong (Application.Handle, GWL_EXSTYLE);
SetWindowLong(Application.Handle, GWL_EXSTYLE, ExtendedStyle OR WS_EX_TOOLWINDOW AND NOT
WS_EX_APPWINDOW);
Application.CreateForm(TForm1, Form1);
Application.Run;
end.

◇[DELPHI]ALT+CTRL+DEL看不到程序
在implementation后添加声明:
function RegisterServiceProcess(dwProcessID, dwType: Integer): Integer;
stdcall;
external 'KERNEL32.DLL';
RegisterServiceProcess(GetCurrentProcessID, 1);//隐藏
RegisterServiceProcess(GetCurrentProcessID, 0);//显示
◇[DELPHI]检测光驱符号
var drive:char;
cdromID:integer;
begin
for drive:='d' to 'z'do
begin
cdromID:=GetDriveType(pchar(drive+':/'));
if cdromID=5 then
showmessage('你的光驱为:'+drive+'盘!');
end;
end;

◇[DELPHI]检测声卡
if auxGetNumDevs()<=0 then
showmessage('No soundcard found!') else
showmessage('Any soundcard
found!');
◇[DELPHI]在字符串网格中画图
StringGrid.OnDrawCell事件
with StringGrid1.Canvasdo

Draw(Rect.Left, Rect.Top, Image1.Picture.Graphic);

◇[SQL SERVER]SQL中代替Like语句的另一种写法
比如查找用户名包含有"c"的所有用户, 可以用
use mydatabase
select * from table1 where username like'%c%"
下面是完成上面功能的另一种写法:
use mydatabase
select * from table1 where charindex('c',username)>0
这种方法理论上比上一种方法多了一个判断语句,即>0, 但这个判断过程是最快的, 我想信80%以上的运算都是
花在查找字
符串及其它的运算上, 所以运用charindex函数也没什么大不了. 用这种方法也有好处, 那就是对%,|等在不能直
接用like
查找到的字符中可以直接在这charindex中运用, 如下:
use mydatabase
select * from table1 where charindex('%',username)>0
也可以写成:
use mydatabase
select * from table1 where charindex(char(37),username)>0
ASCII的字符即为%
◇[DELPHI]SQL显示多数据库/表
SELECT DISTINCT A.bianhao,a.xingming, b.gongzi FROM "jianjie.dbf" a, "gongzi.DBF" b
WHERE A.bianhao=b.bianhao
◇[DELPHI]RFC(Request For Comment)相关
IETF(Internet Engineering Task Force)维护RFC文档http://www.ietf.cnri.reston.va.us
RFC882:报文头标结构
RFC1521:MIME第一部分,传输报文方法
RFC1945:多媒体文档传输文档
◇[DELPHI]TNMUUProcessor的使用
var inStream,outStream:TFileStream;
begin
inStream:=TFileStream.create(infile.txt,fmOpenRead);
outStream:=TFileStream(outfile.txt,fmCreate);
NMUUE.Method:=uuCode;{UUEncode/Decode}
//NMUUE.Method:=uuMIME;{MIME}
NMUUE.InputStream:=InStream;
NMUUE.OutputStream:=OutStream;
NMUUE.Encode;{编码处理}
//NMUUE.Decode;{解码处理}
inStream.free;
outStream.free;
end;

◇[DELPHI]TFileStream的操作
//从文件流当前位置读count字节到缓冲区BUFFER
function read(var buffer;count:longint):longint;override;
//将缓冲区BUFFER读到文件流中
function write(const buffer;count:longint):longint;override;
//设置文件流当前读写指针为OFFSET
function seek(offset:longint;origin:word):longint;override;
origin={soFrombegin
ning,soFromCurrent,soFromEnd}
//从另一文件流中当前位置复制COUNT到当前文件流当前位置
function copyfrom(source:TStream;count:longint):longint;
//读指定文件到文件流
var myFStream:TFileStream;
begin
myFStream:=TFileStream.create(OpenDialog1.filename,fmOpenRead);
end;

[JavaScript]检测是否安装IE插件Shockwave&amp;Quicktime
<script LANGUAGE="JavaScript">
var myPlugin = navigator.plugins["Shockwave"];
if (myPlugin)
document.writeln("你已经安装了 Shockwave!")
else
document.writeln("你尚未安装 Shockwave!")
</script><br>
<script LANGUAGE="JavaScript">
var myPlugin = navigator.plugins["Quicktime"];
if (myPlugin)
document.writeln("你已经安装了Quicktime!")
else
document.writeln("你尚未安装 Quicktime!")
</script>

[INTERNET]表格中引用IFRAME效果
<table border="0" cellpadding="0" cellspacing="0" width="100%">
<tr>
<td><ILAYER id="ad1" visibility="hidden" height="60"></ILAYER> <NOLAYER> <IFRAME
SRC="i:/jinhtml/zj/h21.htm" width="500" height="200" marginwidth="0" marginheight="110" hspace="10"
vspace="20" frameborder="0" scrolling="1"></IFRAME> </NOLAYER> </td>
</tr>
</table>
◇[DELPHI]WebBrowser控件技巧
1。实现打印功能
var vaIn, vaOut: OleVariant;
WebBrowser.ControlInterface.ExecWB(OLECMDID_PRINT, OLECMDEXECOPT_DONTPROMPTUSER, vaIn,
vaOut);
2。WebBrowser从流中读取页面
function TForm1.LoadFromStream(const AStream: TStream): HRESULT;
begin
AStream.seek(0, 0);
Result := (WebBrowser1.Document as IPersistStreamInit).Load(TStreamAdapter.Create(AStream));
end;
3。"about:" protocol will let you Navigate to an HTML string:
procedure TForm1.LoadHTMLString(sHTML: String);
var Flags, TargetFrameName, PostData, Headers: OleVariant;
WebBrowser1.Navigate('about:' + sHTML, Flags, TargetFrameName, PostData, Headers)
4。"res:" protocol will let you Navigate to an HTML file stored as a resource. More informations is available from
the Microsoft site:
procedure TForm1.LoadHTMLResource;
var Flags, TargetFrameName, PostData, Headers: OleVariant;
WebBrowser1.Navigate('res://' + Application.ExeName + '/myhtml', Flags, TargetFrameName, PostData,
Headers)
使用brcc32.exe建立资源文件 (*.rc)
MYHTML 23 "./html/myhtml.htm"
MOREHTML 23 "./html/morehtml.htm"
{$R HTML.RES} //html.rc被编译成html.res
5。保存完整的HTML文件
var
HTMLDocument: IHTMLDocument2;
PersistFile: IPersistFile;
begin
HTMLDocument := WebBrowser1.Document as IHTMLDocument2;
PersistFile := HTMLDocument as IPersistFile;
PersistFile.Save(StringToOleStr('test.htm'), True);
while HTMLDocument.readyState <> 'complete'do
Application.ProcessMessages;
end;

◇[DELPHI]安装WebBrowser控件(内嵌IE控件)
你必须先确定系统已安装Internet Explorer4或以后版本,DELPHI菜单--Component- - Import ActiveX Contro
,列表中选择Microsoft Internet Controls"并ADD到一个已存在的包文件中,WebBrowser控件将显示在ActiveX
控件面板。
◇[DELPHI]实现windows2000半透明窗体
function SetLayeredWindowAttributes(hwnd:HWND;
crKey:Longint;
bAlpha:byte;
dwFlags:longint ):longint;

stdcall;
external user32;//函数声明
procedure TForm1.FormCreate(Sender: TObject);
var l:longint;
begin
l:=getWindowLong(Handle, GWL_EXSTYLE);
l := l Or $80000;
SetWindowLong (handle, GWL_EXSTYLE, l);
SetLayeredWindowAttributes(handle, 0, 180, 2);
end;

◇[DELPHI]程序显示广告WebBrowser加载图片
var Flag, frame, pData, Header: OLEVariant;
begin
WebBrowser1.Navigate('http://www.chineseall.com/images/logo.jpg', flag, frame,pData, Header)
end;

◇[DELPHI]计算一个目录的大小
function GetDirectorySize(const ADirectory: string): Integer;
var
Dir: TSearchRec;
Ret: integer;
Path: string;
begin

Result := 0;
Path := ExtractFilePath(ADirectory);
Ret := Sysutils.FindFirst(ADirectory, faAnyFile, Dir);
if Ret <> NO_ERROR then

exit;
try
while ret=NO_ERRORdo

begin

inc(Result, Dir.Size);
//如果是目录,且不是'.'或'..'则进行递归调用
if (Dir.Attr in [faDirectory]) and (Dir.Name[1] <> '.') then

Inc(Result, GetDirectorySize(Path + Dir.Name + '/*.*'));
Ret := Sysutils.FindNext(Dir);
end;

finally
Sysutils.FindClose(Dir);
end;

end;

◇[DELPHI]清空一个目录
function EmptyDirectory(TheDirectory :String ;
Recursive : Boolean) :
Boolean;
var
SearchRec : TSearchRec;
Res : Integer;
begin
Result := False;
TheDirectory := NormalDir(TheDirectory);
Res := FindFirst(TheDirectory + '*.*', faAnyFile, SearchRec);
try
while Res = 0do
begin
if (SearchRec.Name <> '.') and (SearchRec.Name <> '..') then
begin
if ((SearchRec.Attr and faDirectory) > 0) and Recursive
then
begin
EmptyDirectory(TheDirectory + SearchRec.Name, True);
RemoveDirectory(PChar(TheDirectory + SearchRec.Name));
end
else
begin
DeleteFile(PChar(TheDirectory + SearchRec.Name))
end;
end;
Res := FindNext(SearchRec);
end;
Result := True;
finally
FindClose(SearchRec.FindHandle);
end;
end;

◇[DELPHI]发布ADO程序之安装ADO
运行一次 MDac_typ.exe ,这个文件在微软的 Windows、IE、Office、Visual Studio 中都有。
安装程序所安装后的目录与程序中设置的目录路径一样,C:/Program Files/Common Files/System/ado文件夹
中有没有ADO组件,装ACCESS2000就有ADO2.1,没有则安装MS OFfice2000,编译要去
掉project->Option->Packages对话框中的Build With RunTime Library的勾。
◇[DELPHI]拦截Windows系统消息:WM_CLOSE消息
procedure WMClose(var Msg: TMessage);message WM_CLOSE;
procedure TMainForm.WMClose(var Msg: TMessage);
begin
m_bCloseNoQuery := false;
inherited;
end;
 
真的很好,十分感谢!!!
 
很好!对我很有帮助
 
好同志!应该加分予以鼓励。
 
好多呀,看来是不用不充了,收藏:)
 
好像VK_DELETE不是对应的键盘上面的删除。没效果。不知道为什么!
 
强!
大致看了一下,提两个修改意见:
◇[DELPHI]设置窗体的最大显示
onFormCreate事件
self.width:=screen.width;
self.height:=screen.height;
修改:
self.windowstate := wsmaxmized;
◇[DELPHI]文件名的非法字符过滤
for i:=1 to length(s)do
if s in ['/','/',':','*','?','<','>','|'] then
修改:
try
slist := tstringlist.create;
slist.savetofile(s);
result := true;
deletefile(s);
except
result := false;
end;
利用异常机制,这样可以兼容linux的文件命名。
 
常用的几个字符串函数
/////////////////////////////////////////////////////////////////
整理: savenight 来自Delphi help
/////////////////////////////////////////////////////////////////
{Splits a string into multiple lines as its
length approaches a specified size.}
procedure TForm1.btn_WrapTextClick(Sender: TObject);
var
s: string;
begin
s := 'www.delphibbs.com is a wonderful place to learn delphi, kylix, java etc. I love it';
Label1.Caption := s;
s := WrapText(s, #13#10 + 'wj', ['.', ' ', #9, '-'], 30);
Label2.Caption := s;
end;

{Converts a string to a numeric representation.
if the string is invalid, the index of the offending
character is stored in Code;
otherwise,
Code is set to zero. }
procedure TForm1.btn_ValClick(Sender: TObject);
var
s: string;
c: integer;
i:do
uble;
begin
s := '1234.86.233';
val(s, i, c);
caption := 'i:' + floattostr(i) + ' ' + 'c:' + inttostr(c);
end;

{Returns a string with a specified number of
repeating characters.}
procedure TForm1.btn_StringOfCharClick(Sender: TObject);
begin
caption := StringOfChar('w', 10);
end;

{Returns the quoted version of a string.
A single quote character (') is inserted at
the begin
ning and end of string S, and each
single quote character in the string is repeated.
}
procedure TForm1.btnQuotedStrClick(Sender: TObject);
var
s: string;
begin
s := 'delphi''s pascal';
s := QuotedStr(s);
caption := s;
end;

{Sets the contents and length of the given string.
SetString procedure sets the length of string S to Length,
then
copies Length characters from c to the string.
}
procedure TForm1.btn_SetStringClick(Sender: TObject);
var
s: string;
c: array[0..88] of char;
size: cardinal;
begin
size := sizeof(c);
//here size=88;
GetUserName(c, size);
//here size=14;
caption := caption + 'old length:' + inttostr(length(s));
SetString(s, c, size);
caption := caption + ' new length:' + inttostr(length(s));
end;

{Returns the index value of the first character in
a specified substring that occurs in a given string.}
procedure TForm1.btn_PosClick(Sender: TObject);
var
s: string;
i: integer;
begin
s := 'savenight is a cool guy!';
i := Pos('ni', s);
//i=5;
caption := inttostr(i);
end;

{Returns True if a specified character in a string
matches one of a set of delimiters starting from
byte position Index.}
procedure TForm1.btn_IsDelimiterClick(Sender: TObject);
var
s: string;
begin
s := 'hello everyone';
if IsDelimiter('o', s, 5) then
caption := 'yes'
else
caption := 'no';
end;

procedure TForm1.btn_InsertClick(Sender: TObject);
var
S: string;
begin
S := 'savenight delphi';
Insert(' love ', S, 10);
caption := s;
end;
 
very good!!!
Thanks!
 
真得很不错!我代大家谢谢你!!!
 
意图很好,只是这样一来帖子实在太长了
打开一下要老半天,我看还是给个链接的好
 
追加部分
[DELPHI]配置ODBC的代码
var
reg: TRegistry;
Driver: string;
begin
//建立和更新odbc数据源
//查找ODBCINST.INI键,如果sql server的驱动程序没有安装,则提示退出
//如果存在,则进行配置
reg := TRegistry.Create;
try
with regdo
begin
RootKey := HKEY_LOCAL_MACHINE;
if OpenKey('Software/ODBC/ODBCINST.INI/SQL Server', False) then
begin
//如果存在sql server 驱动程序
Driver := ReadString('Driver');
CloseKey;
if OpenKey('Software/ODBC/ODBC.INI/ODBC Data Sources', True) then
begin
//注册一个DSN名称
WriteString(Edit_DataSource.Text, 'SQL Server');
end
else
begin
//创建键值失败
Application.MessageBox(pchar('在创建DSN' + edit_datasource.text + '时发生错误'), '创建ODBC数据源失败', MB_ICONINFORMATION or MB_OK);
exit;
end;
CloseKey;
//end 建立dsn
if OpenKey('Software/ODBC/ODBC.INI/' + Edit_DataSource.Text, True) then
begin
WriteString('Database', Edit_DataSource.Text);
WriteString('Driver', Driver);
WriteString('LastUser', Edit_LoginUser.Text);
WriteString('Server', Edit_Ip.Text);
end
else
begin
//创建键值失败
Application.MessageBox(pchar('在创建DSN' + edit_datasource.text + '时发生错误'), '创建ODBC数据源失败', MB_ICONINFORMATION or MB_OK);
exit;
end;
CloseKey;
end
else
Application.MessageBox('在当前机器上没有安装 SQL Server的ODBC 驱动程序!,请安装相应的驱动程序', '驱动程序出错', MB_ICONINFORMATION or MB_OK);
CloseKey;
end;
finally
reg.Free;
end;
end;

[DELPHI]验证邮件地址有效函数
function IsValidEmail(const Value: string): boolean;
function CheckAllowed(const s: string): boolean;
var
i: integer;
begin

Result:= false;
for i:= 1 to Length(s)do

begin

// illegal char in s -> no valid address
if not (s in ['a'..'z','A'..'Z','0'..'9','_','-','.']) then

Exit;
end;

Result:= true;
end;

var
i: integer;
namePart, serverPart: string;
begin
// of IsValidEmail
Result:= false;
i:= Pos('@', Value);
if (i = 0) or (pos('..', Value) > 0) then

Exit;
namePart:= Copy(Value, 1, i - 1);
serverPart:= Copy(Value, i + 1, Length(Value));
if (Length(namePart) = 0) // @ or name missing
or ((Length(serverPart) < 4)) // name or server missing or
then
Exit;
// too short
i:= Pos('.', serverPart);
// must havedo
t and at least 3 places from end
if (i = 0) or (i >= (Length(serverPart) - 2)) then

Exit;
Result:= CheckAllowed(namePart) and CheckAllowed(serverPart);
end;

[DELPHI]设定IE的默认打开主页
procedure SetStartPage(StartPage:string);
var
Reg:TRegistry;
begin
Reg:=TRegistry.Create;
Reg.RootKey:=HKEY_CURRENT_USER;
Reg.OpenKey(StartPagePath,False);
Reg.WriteString('Start Page',StartPage);
Reg.Free;
end;

[DELPHI]FORM边缘特效
procedure TForm1.FormCreate(Sender: TObject);
var
Region1 : array of tPoint;
Region1hrgn : hRgn;
begin
SetLength(Region1,59);
Region1[0].X:=12;
Region1[0].Y:=6;
Region1[1].X:=484;
Region1[1].Y:=6;
Region1[2].X:=484;
Region1[2].Y:=7;
Region1[3].X:=486;
Region1[3].Y:=7;
Region1[4].X:=486;
Region1[4].Y:=8;
Region1[5].X:=487;
Region1[5].Y:=8;
Region1[6].X:=487;
Region1[6].Y:=9;
Region1[7].X:=488;
Region1[7].Y:=9;
Region1[8].X:=488;
Region1[8].Y:=10;
Region1[9].X:=489;
Region1[9].Y:=10;
Region1[10].X:=489;
Region1[10].Y:=12;
Region1[11].X:=490;
Region1[11].Y:=12;
Region1[12].X:=490;
Region1[12].Y:=285;
Region1[13].X:=489;
Region1[13].Y:=285;
Region1[14].X:=489;
Region1[14].Y:=287;
Region1[15].X:=488;
Region1[15].Y:=287;
Region1[16].X:=488;
Region1[16].Y:=288;
Region1[17].X:=487;
Region1[17].Y:=288;
Region1[18].X:=487;
Region1[18].Y:=289;
Region1[19].X:=486;
Region1[19].Y:=289;
Region1[20].X:=486;
Region1[20].Y:=290;
Region1[21].X:=484;
Region1[21].Y:=290;
Region1[22].X:=484;
Region1[22].Y:=291;
Region1[23].X:=101;
Region1[23].Y:=291;
Region1[24].X:=100;
Region1[24].Y:=290;
Region1[25].X:=99;
Region1[25].Y:=290;
Region1[26].X:=98;
Region1[26].Y:=289;
Region1[27].X:=97;
Region1[27].Y:=288;
Region1[28].X:=96;
Region1[28].Y:=287;
Region1[29].X:=95;
Region1[29].Y:=286;
Region1[30].X:=95;
Region1[30].Y:=284;
Region1[31].X:=94;
Region1[31].Y:=283;
Region1[32].X:=94;
Region1[32].Y:=200;
Region1[33].X:=93;
Region1[33].Y:=199;
Region1[34].X:=93;
Region1[34].Y:=198;
Region1[35].X:=92;
Region1[35].Y:=197;
Region1[36].X:=91;
Region1[36].Y:=196;
Region1[37].X:=90;
Region1[37].Y:=195;
Region1[38].X:=89;
Region1[38].Y:=194;
Region1[39].X:=88;
Region1[39].Y:=194;
Region1[40].X:=87;
Region1[40].Y:=193;
Region1[41].X:=14;
Region1[41].Y:=193;
Region1[42].X:=13;
Region1[42].Y:=192;
Region1[43].X:=12;
Region1[43].Y:=192;
Region1[44].X:=11;
Region1[44].Y:=191;
Region1[45].X:=10;
Region1[45].Y:=190;
Region1[46].X:=9;
Region1[46].Y:=189;
Region1[47].X:=8;
Region1[47].Y:=188;
Region1[48].X:=8;
Region1[48].Y:=187;
Region1[49].X:=7;
Region1[49].Y:=186;
Region1[50].X:=7;
Region1[50].Y:=184;
Region1[51].X:=6;
Region1[51].Y:=183;
Region1[52].X:=6;
Region1[52].Y:=12;
Region1[53].X:=7;
Region1[53].Y:=11;
Region1[54].X:=7;
Region1[54].Y:=10;
Region1[55].X:=8;
Region1[55].Y:=9;
Region1[56].X:=9;
Region1[56].Y:=8;
Region1[57].X:=10;
Region1[57].Y:=7;
Region1[58].X:=11;
Region1[58].Y:=7;
Region1hrgn:=CreatePolygonRgn(Region1[0],59,2);
SetWindowRgn(Handle, Region1hrgn, True);
end;

[DELPHI]LISTVIEW实现隔行背景颜色
procedure TForm1.ListView1AdvancedCustomDrawItem(Sender: TCustomListView;
Item: TListItem;
State: TCustomDrawState;
Stage: TCustomDrawStage;
var DefaultDraw: Boolean);
begin
if item.Index mod 2 = 1 then
begin
sender.Canvas.Brush.Color:=clYellow;
end
else
sender.Canvas.Brush.Color:=clwhite;
end;

[DELPHI]判断机器是否网络状态
uses WinInet;
procedure TForm1.Button1Click(Sender: TObject);
function GetOnlineStatus : Boolean;
var ConTypes : Integer;
begin
ConTypes := INTERNET_CONNECTION_MODEM + INTERNET_CONNECTION_LAN + INTERNET_CONNECTION_PROXY;
if (InternetGetConnectedState(@ConTypes, 0) = False)
then
Result := False
else
Result := True;
end;
begin
if not GetOnlineStatus then
ShowMessage('Not Connected');
end;

[DELPHI]窗体渐渐出现
AnimateWindow(Handle,1000,AW_CENTER);
//在窗体创建事件中
[DELPHI]制作竖式菜单图片的关键代码
ONDrawItem事件
begin
acanvas.Draw(0,2,image1.picture.bitmap);
anvas.TextOut(arect.left+image1.picture.bitmap.width+2,arect.top,tmenuitem(sender).caption);
end;

[软件开发]目前几个热门开发工具含义
Borland Enterprise Studio, Java Edition 是一个完整的电子商务开发平台,能够加速
J2EE架构的电子商务应用系统投向市场的周期。
Borland Enterprise Studio提供了完整的应用程序开发周期解决方案,
全面集成业界领先的Java 应用设计、开发和过程管理解决方案。
包含以下技术:
Borland JBuilder:市场份额居首位的 Java 开发工具
Borland AppServer:企业级 J2EE 应用服务器
Rational Rose Modeler 2001:世界领先的可视化建模工具
Rational Rose with JBuilder integration:建立在 Rose 模型和 JBuilder 应用程序之间的双向引擎
Rational Unified Process:最先进的软件开发管理思想和工具
Macromedia Dreamweaver UltraDev 4:提供专业的 Web 应用开发支持
[软件开发]Rational的工具集的功能解释
Rational Suite是Rational公司开发的一套为协助软件开发者进行软件开发的协
助工具套件,主要由以下几个软件构成(中文译名按Rational中国代理翻译):
Rational Unified Process
Requisite Pro需求管理工具(整个开发过程)
Clear Case配置管理工具(整个开发过程,包括版本管理、进程控制)
Clear Quest变更请求管理工具(整个开发过程)
SoDA自动文档管理工具(整个开发过程)
ROSE可视化建模工具(建立软件模型,进行正向、逆向软件工程[engineering])
Robot(软件测试用,通过Script自动模拟输入输出)
TestFactory(软件测试用)
Pure Coverage(测试时用,能自动检查那些代码没有被测试)
Purify(测试时用,检查运行时内存错误)
Quantify(性能检测工具,查出系统瓶颈以便改进运行速度)
LoadTest
Performance Architect
面向不同的用户,Rational把以上的软件打成不同的开发包:
Analyst Studio 主要面向系统分析员
Development Studio 主要面向软件开发者
Test Studio 主要面向测试工作者
Performance Studio
Enterprise 主要面向企业
[软件开发]除rose以外UML设计工具
国内常见:
1、Visual Modeler——微软的,安装Visual Studio就有,只是功能有点简单;
2、Rational Rose2000——Rational公司的,不用说啦,你嫌贵;
3、Paradigm Plus——CA公司的,太平洋公司代理,和Rose差不多具有强大的功能,只是Rational别的支持系统(如配置管理、测试)就不和他兼容了;
4、PlayCase——中科院沈阳研究所的,免费(强烈推荐试一试,因为它同时支持IDEF,也支持中国的MIS系统的要命的步骤:组织结构图——业务结构),可到http://www.mrcase.net去下载;
5、Viso2000——也是微软的了,价格也不算太贵,不过用来做软件有点麻烦;
国外的可以到:
http://www.objectsbydesign.com/tools/umltools_byCompany.html
去看看。
 
全文下载/保存地址
http://jp.njuct.edu.cn/crystal/uploadtools/DELPHI_skills.htm
 
yi后还会有吗?
 
Very Good!
为了向房客学习,我也来一点吧:
http://smelless.delphibbs.com/forum/forum.asp?forum_id=10&amp;cat_id=5
这儿是我收藏的部分技巧,希望对大家有用。
 
收藏先。
 
后退
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