如何定时监控一个文本文件的大小，最好有代码 ( 积分: 100 )

不用Time控件

给你个思路:在线程里用ReadDirectoryChangesW监控目录下文件的变化,然后用完成端口方式把变化的消息传递给调用的程序.暂时木有完整的单独的代码,很久前写过,不过是与其他代码在一起的.有时间整理出来.

unit MainFileShell;

interface

uses
Windows, Messages, SysUtils, Classes, Graphics, Controls, Forms,
Dialogs,StdCtrls,shlobj,Activex,shellapi,Menus, ComCtrls;
const
my_msg=wm_user+100;
const
SHCNE_RENAMEITEM = $1;
SHCNE_CREATE = $2;
SHCNE_DELETE = $4;
SHCNE_MKDIR = $8;
SHCNE_RMDIR = $10;
SHCNE_MEDIAINSERTED = $20;
SHCNE_MEDIAREMOVED = $40;
SHCNE_DRIVEREMOVED = $80;
SHCNE_DRIVEADD = $100;
SHCNE_NETSHARE = $200;
SHCNE_NETUNSHARE = $400;
SHCNE_ATTRIBUTES = $800;
SHCNE_UPDATEDIR = $1000;
SHCNE_UPDATEITEM = $2000;
SHCNE_SERVERDISCONNECT = $4000;
SHCNE_UPDATEIMAGE = $8000;
SHCNE_DRIVEADDGUI = $10000;
SHCNE_RENAMEFOLDER = $20000;
SHCNE_FREESPACE = $40000;
SHCNE_ASSOCCHANGED = $8000000;
SHCNE_DISKEVENTS = $2381F;
SHCNE_GLOBALEVENTS = $C0581E0;
SHCNE_ALLEVENTS = $7FFFFFFF;
SHCNE_INTERRUPT = $80000000;

SHCNF_IDLIST = 0; // LPITEMIDLIST
SHCNF_PATHA = $1; // path name
SHCNF_PRINTERA = $2;// printer friendly name
SHCNF_DWORD = $3; // DWORD
SHCNF_PATHW = $5; // path name
SHCNF_PRINTERW = $6;// printer friendly name
SHCNF_TYPE = $FF;

SHCNF_FLUSH = $1000;

SHCNF_FLUSHNOWAIT = $2000;
SHCNF_PATH = SHCNF_PATHW;
SHCNF_PRINTER = SHCNF_PRINTERW;

WM_SHNOTIFY = $401;
NOERROR = 0;

type
TaForm = class(TForm)
Memo1: TMemo;
poprenwulan: TPopupMenu;
N1: TMenuItem;
N2: TMenuItem;
N3: TMenuItem;
N4: TMenuItem;
N5: TMenuItem;
N6: TMenuItem;
N7: TMenuItem;
msg: TStatusBar;
N8: TMenuItem;
startbt: TMenuItem;
N10: TMenuItem;
procedure FormClose(Sender: TObject; var Action: TCloseAction);
procedure FormCreate(Sender: TObject);
procedure startbtClick(Sender: TObject);
procedure N10Click(Sender: TObject);
procedure N7Click(Sender: TObject);
procedure N5Click(Sender: TObject);
procedure N3Click(Sender: TObject);
private
{ Private declarations }
procedure WMShellReg(var Message:TMessage);message WM_SHNOTIFY;
procedure Whenclickicon(var Message:TMessage);message My_msg;
public
{ Public declarations }
end;

type PSHNOTIFYSTRUCT=^SHNOTIFYSTRUCT;
SHNOTIFYSTRUCT = record
dwItem1 : PItemIDList;
dwItem2 : PItemIDList;
end;

Type PSHFileInfoByte=^SHFileInfoByte;
_SHFileInfoByte = record
hIcon :Integer;
iIcon :Integer;
dwAttributes : Integer;
szDisplayName : array [0..259] of char;
szTypeName : array [0..79] of char;
end;
SHFileInfoByte=_SHFileInfoByte;

Type PIDLSTRUCT = ^IDLSTRUCT;
_IDLSTRUCT = record
pidl : PItemIDList;
bWatchSubFolders : Integer;
end;
IDLSTRUCT =_IDLSTRUCT;


function SHNotify_Register(hWnd : Integer) : Bool;
function SHNotify_UnRegister:Bool;
function
SHEventName(strPath1,strPath2:string;lParam:Integer):string;

Function SHChangeNotifyDeregister(hNotify:integer):integer;stdcall;
external 'Shell32.dll' index 4;
Function
SHChangeNotifyRegister(hWnd,uFlags,dwEventID,uMSG,cItems:LongWord;
lppsIDLSTRUCT):integer;stdcall;external 'Shell32.dll'
index 2;
Function SHGetFileInfoPidl(pidl : PItemIDList;
dwFileAttributes : Integer;
psfib : PSHFILEINFOBYTE;
cbFileInfo : Integer;
uFlags : Integer):Integer;stdcall;
external 'Shell32.dll' name 'SHGetFileInfoA';

var
aForm: TaForm;
rwlicon:TNotifyIconData;
m_hSHNotify:Integer;
m_pidlDesktop : PItemIDList;
implementation

uses GuoluUnit;
{$R *.DFM}
procedure TaForm.Whenclickicon(var Message:TMessage);
var
p:TPoint;
begin
//
if message.LParam=wm_lbuttonDown then
BEGIN
GetCursorPos(p);
poprenwulan.Popup(p.x,p.y);
END;
//
end;
function
SHEventName(strPath1,strPath2:string;lParam:Integer):string;
var
sEvent:String;
begin
case lParam of //根据参数设置提示消息
SHCNE_RENAMEITEM: sEvent := '重命名文件'+strPath1+'为'+strpath2;
SHCNE_CREATE: sEvent := '建立文件 文件名：'+strPath1;
SHCNE_DELETE: sEvent := '删除文件 文件名：'+strPath1;
SHCNE_MKDIR: sEvent := '新建目录 目录名：'+strPath1;
SHCNE_RMDIR: sEvent := '删除目录 目录名：'+strPath1;
SHCNE_MEDIAINSERTED: sEvent := strPath1+'中插入可移动存储介质';
SHCNE_MEDIAREMOVED: sEvent := strPath1+'中移去可移动存储介质'+strPath1+''+strpath2;
SHCNE_DRIVEREMOVED: sEvent := '移去驱动器'+strPath1;
SHCNE_DRIVEADD: sEvent := '添加驱动器'+strPath1;
SHCNE_NETSHARE: sEvent := '改变目录'+strPath1+'的共享属性';

SHCNE_ATTRIBUTES: sEvent := '改变文件目录属性 文件名'+strPath1;
SHCNE_UPDATEDIR: sEvent := '更新目录'+strPath1;
SHCNE_UPDATEITEM: sEvent := '更新文件 文件名：'+strPath1;
SHCNE_SERVERDISCONNECT: sEvent := '断开与服务器的连接'+strPath1+''+strpath2;
SHCNE_UPDATEIMAGE: sEvent := 'SHCNE_UPDATEIMAGE';
SHCNE_DRIVEADDGUI: sEvent := 'SHCNE_DRIVEADDGUI';
SHCNE_RENAMEFOLDER: sEvent := '重命名文件夹'+strPath1+'为'+strpath2;
SHCNE_FREESPACE: sEvent := '磁盘空间大小改变';
SHCNE_ASSOCCHANGED: sEvent := '改变文件关联';
else
sEvent:='未知操作'+IntToStr(lParam);
end;
Result:=sEvent;
end;

function SHNotify_Register(hWnd : Integer) : Bool;
var
psIDLSTRUCT;
begin
{$R-}
Result:=False;
If m_hSHNotify = 0 then begin
//获取桌面文件夹的Pidl
if SHGetSpecialFolderLocation(0, CSIDL_DESKTOP,
m_pidlDesktop)<> NOERROR then
aForm.close;
if Boolean(m_pidlDesktop) then begin
ps.bWatchSubFolders := 1;
ps.pidl := m_pidlDesktop;

// 利用SHChangeNotifyRegister函数注册系统消息处理
m_hSHNotify := SHChangeNotifyRegister(hWnd, (SHCNF_TYPE Or
SHCNF_IDLIST),
(SHCNE_ALLEVENTS Or
SHCNE_INTERRUPT),
WM_SHNOTIFY, 1, ps);
Result := Boolean(m_hSHNotify);
end
Else
// 如果出现错误就使用 CoTaskMemFree函数来释放句柄
CoTaskMemFree(m_pidlDesktop);
End;
{$R+}
end;

function SHNotify_UnRegister:Bool;
begin
Result:=False;
If Boolean(m_hSHNotify) Then
//取消系统消息监视，同时释放桌面的Pidl
If Boolean(SHChangeNotifyDeregister(m_hSHNotify)) Then begin
{$R-}
m_hSHNotify := 0;
CoTaskMemFree(m_pidlDesktop);
Result := True;
{$R-}
End;
end;

procedure TaForm.WMShellReg(var Message:TMessage);
//系统消息处理函数
var
strPath1,strPath2:String;
charPath:array[0..259]of char;
pidlItemSHNOTIFYSTRUCT;
begin
pidlItem:=PSHNOTIFYSTRUCT(Message.wParam);
//获得系统消息相关得路径
SHGetPathFromIDList(pidlItem.dwItem1,charPath);
strPath1:=charPath;
SHGetPathFromIDList(pidlItem.dwItem2,charPath);
strPath2:=charPath;


Memo1.Lines.Add(SHEvEntName(strPath1,strPath2,Message.lParam)+chr(13)+chr(10));
end;

procedure TaForm.FormClose(Sender: TObject; var Action:
TCloseAction);
begin
// file://在程序退出的同时删除监视
if Boolean(m_pidlDesktop) then
SHNotify_Unregister;
//////////////////////////
rwlicon.cbSize:=sizeof(rwlicon);
rwlicon.Wnd:=handle;
rwlicon.uID:=1;
shell_notifyIcon(nim_delete,@rwlicon);
end;

procedure TaForm.FormCreate(Sender: TObject);
begin
rwlicon.cbSize:=sizeof(rwlicon);
rwlicon.Wnd:=handle;
rwlicon.uID:=1;
rwlicon.hIcon:=application.Icon.Handle;
rwlicon.szTip:='';
rwlicon.uCallbackMessage:=My_msg;
rwlicon.uFlags:=nif_icon or nif_tip or nif_message;
shell_notifyIcon(nim_add,@rwlicon);
end;

procedure TaForm.startbtClick(Sender: TObject);
begin
m_hSHNotify:=0;
if SHNotify_Register(aForm.Handle) then begin //file://注册Shell监视
ShowMessage('Shell监视程序成功注册');
startBt.Enabled := False;
end
else
ShowMessage('Shell监视程序注册失败');
end;

procedure TaForm.N10Click(Sender: TObject);
begin
if Boolean(m_pidlDesktop) then
SHNotify_Unregister;
end;

procedure TaForm.N7Click(Sender: TObject);
begin
close;
end;

procedure TaForm.N5Click(Sender: TObject);
begin
aform.Show;
end;

procedure TaForm.N3Click(Sender: TObject);
begin
aformguolu.show;
end;

end.

楼上的兄弟，我是要实时或定时的知道文本文件的大小或者修改时间是否有改变捏，你的代码估计实现不了啊

那个就是实时的监控文件.
操作系统提供的接口.
你Baidu或Google查查SHNotify_Register就知道了

但是里面没有单个文件的处理

都告诉你百度一下那个函数了.怎么这么懒

呵呵，多谢了，看来你很闲啊。我打算用另外一个函数将就用下了FindFirstChangeNotification，一看你就是高手啊，想请教下另外一个问题，该如何解决呢？这是问题的连接：http://www.delphibbs.com/delphibbs/dispq.asp?lid=3859636