是用Delphi一个HTTPGET控件时间的实现的
其代码为
unit HTTPGet;
interface
uses
Windows, Messages, SysUtils, Classes, WinInet;
type
TOnProgressEvent = procedure(Sender: TObject;
TotalSize, Readed: Integer) of object;
TOnDoneFileEvent = procedure(Sender: TObject;
FileName: String;
FileSize: Integer) of object;
TOnDoneStringEvent = procedure(Sender: TObject;
Result: String) of object;
THTTPGetThread = class(TThread)
private
FTAcceptTypes,
FTAgent,
FTURL,
FTFileName,
FTStringResult,
FTUserName,
FTPassword,
FTPostQuery,
FTReferer: String;
FTBinaryData,
FTUseCache: Boolean;
FTResult: Boolean;
FTFileSize: Integer;
FTToFile: Boolean;
BytesToRead, BytesReaded: DWord;
FTProgress: TOnProgressEvent;
procedure UpdateProgress;
protected
procedure Execute;
override;
public
constructor Create(aAcceptTypes, aAgent, aURL, aFileName, aUserName, aPassword, aPostQuery, aReferer: String;
aBinaryData, aUseCache: Boolean;
aProgress: TOnProgressEvent;
aToFile: Boolean);
end;
THTTPGet = class(TComponent)
private
FAcceptTypes: String;
FAgent: String;
FBinaryData: Boolean;
FURL: String;
FUseCache: Boolean;
FFileName: String;
FUserName: String;
FPassword: String;
FPostQuery: String;
FReferer: String;
FWaitThread: Boolean;
FThread: THTTPGetThread;
FError: TNotifyEvent;
FResult: Boolean;
FProgress: TOnProgressEvent;
FDoneFile: TOnDoneFileEvent;
FDoneString: TOnDoneStringEvent;
procedure ThreadDone(Sender: TObject);
public
constructor Create(aOwner: TComponent);
override;
destructor Destroy;
override;
procedure GetFile;
procedure GetString;
procedure Abort;
published
property AcceptTypes: String read FAcceptTypes write FAcceptTypes;
property Agent: String read FAgent write FAgent;
property BinaryData: Boolean read FBinaryData write FBinaryData;
property URL: String read FURL write FURL;
property UseCache: Boolean read FUseCache write FUseCache;
property FileName: String read FFileName write FFileName;
property UserName: String read FUserName write FUserName;
property Password: String read FPassword write FPassword;
property PostQuery: String read FPostQuery write FPostQuery;
property Referer: String read FReferer write FReferer;
property WaitThread: Boolean read FWaitThread write FWaitThread;
property OnProgress: TOnProgressEvent read FProgress write FProgress;
property OnDoneFile: TOnDoneFileEvent read FDoneFile write FDoneFile;
property OnDoneString: TOnDoneStringEvent read FDoneString write FDoneString;
property OnError: TNotifyEvent read FError write FError;
end;
procedure Register;
implementation
// THTTPGetThread
constructor THTTPGetThread.Create(aAcceptTypes, aAgent, aURL, aFileName, aUserName, aPassword, aPostQuery, aReferer: String;
aBinaryData, aUseCache: Boolean;
aProgress: TOnProgressEvent;
aToFile: Boolean);
begin
FreeOnTerminate := True;
inherited Create(True);
FTAcceptTypes := aAcceptTypes;
FTAgent := aAgent;
FTURL := aURL;
FTFileName := aFileName;
FTUserName := aUserName;
FTPassword := aPassword;
FTPostQuery := aPostQuery;
FTReferer := aReferer;
FTProgress := aProgress;
FTBinaryData := aBinaryData;
FTUseCache := aUseCache;
FTToFile := aToFile;
Resume;
end;
procedure THTTPGetThread.UpdateProgress;
begin
FTProgress(Self, FTFileSize, BytesReaded);
end;
procedure THTTPGetThread.Execute;
var
hSession, hConnect, hRequest: hInternet;
HostName, FileName: String;
f: File;
Buf: Pointer;
dwBufLen, dwIndex: DWord;
Data: Array[0..$400] of Char;
TempStr: String;
RequestMethod: PChar;
InternetFlag: DWord;
AcceptType: LPStr;
procedure ParseURL(URL: String;
var HostName, FileName: String);
procedure ReplaceChar(c1, c2: Char;
var St: String);
var
p: Integer;
begin
while Truedo
begin
p := Pos(c1, St);
if p = 0 then
Break
else
St[p] := c2;
end;
end;
var
i: Integer;
begin
if Pos('http://', LowerCase(URL)) <> 0 then
System.Delete(URL, 1, 7);
i := Pos('/', URL);
HostName := Copy(URL, 1, i);
FileName := Copy(URL, i, Length(URL) - i + 1);
if (Length(HostName) > 0) and (HostName[Length(HostName)] = '/') then
SetLength(HostName, Length(HostName) - 1);
end;
procedure CloseHandles;
begin
InternetCloseHandle(hRequest);
InternetCloseHandle(hConnect);
InternetCloseHandle(hSession);
end;
begin
try
ParseURL(FTURL, HostName, FileName);
if Terminated then
begin
FTResult := False;
Exit;
end;
if FTAgent <> '' then
hSession := InternetOpen(PChar(FTAgent),
INTERNET_OPEN_TYPE_PRECONFIG, nil, nil, 0)
else
hSession := InternetOpen(nil,
INTERNET_OPEN_TYPE_PRECONFIG, nil, nil, 0);
hConnect := InternetConnect(hSession, PChar(HostName),
INTERNET_DEFAULT_HTTP_PORT, PChar(FTUserName), PChar(FTPassword), INTERNET_SERVICE_HTTP, 0, 0);
if FTPostQuery = '' then
RequestMethod := 'GET'
else
RequestMethod := 'POST';
if FTUseCache then
InternetFlag := 0
else
InternetFlag := INTERNET_FLAG_RELOAD;
AcceptType := PChar('Accept: ' + FTAcceptTypes);
hRequest := HttpOpenRequest(hConnect, RequestMethod, PChar(FileName), 'HTTP/1.0',
PChar(FTReferer), @AcceptType, InternetFlag, 0);
if FTPostQuery = '' then
HttpSendRequest(hRequest, nil, 0, nil, 0)
else
HttpSendRequest(hRequest, 'Content-Type: application/x-www-form-urlencoded', 47,
PChar(FTPostQuery), Length(FTPostQuery));
if Terminated then
begin
CloseHandles;
FTResult := False;
Exit;
end;
dwIndex := 0;
dwBufLen := 1024;
GetMem(Buf, dwBufLen);
FTResult := HttpQueryInfo(hRequest, HTTP_QUERY_CONTENT_LENGTH,
Buf, dwBufLen, dwIndex);
if Terminated then
begin
FreeMem(Buf);
CloseHandles;
FTResult := False;
Exit;
end;
if FTResult or not FTBinaryData then
begin
if FTResult then
FTFileSize := StrToInt(StrPas(Buf));
BytesReaded := 0;
if FTToFile then
begin
AssignFile(f, FTFileName);
Rewrite(f, 1);
end
else
FTStringResult := '';
while Truedo
begin
if Terminated then
begin
if FTToFile then
CloseFile(f);
FreeMem(Buf);
CloseHandles;
FTResult := False;
Exit;
end;
if not InternetReadFile(hRequest, @Data, SizeOf(Data), BytesToRead) then
Break
else
if BytesToRead = 0 then
Break
else
begin
if FTToFile then
BlockWrite(f, Data, BytesToRead)
else
begin
TempStr := Data;
SetLength(TempStr, BytesToRead);
FTStringResult := FTStringResult + TempStr;
end;
inc(BytesReaded, BytesToRead);
if Assigned(FTProgress) then
Synchronize(UpdateProgress);
end;
end;
if FTToFile then
FTResult := FTFileSize = Integer(BytesReaded)
else
begin
SetLength(FTStringResult, BytesReaded);
FTResult := BytesReaded <> 0;
end;
if FTToFile then
CloseFile(f);
end;
FreeMem(Buf);
CloseHandles;
except
end;
end;
// HTTPGet
constructor THTTPGet.Create(aOwner: TComponent);
begin
inherited Create(aOwner);
FAcceptTypes := '*/*';
FAgent := 'UtilMind HTTPGet';
end;
destructor THTTPGet.Destroy;
begin
Abort;
inherited Destroy;
end;
procedure THTTPGet.GetFile;
var
Msg: TMsg;
begin
if not Assigned(FThread) then
begin
FThread := THTTPGetThread.Create(FAcceptTypes, FAgent, FURL, FFileName, FUserName, FPassword, FPostQuery, FReferer,
FBinaryData, FUseCache, FProgress, True);
FThread.OnTerminate := ThreadDone;
if FWaitThread then
while Assigned(FThread)do
while PeekMessage(Msg, 0, 0, 0, PM_REMOVE)do
begin
TranslateMessage(Msg);
DispatchMessage(Msg);
end;
end
end;
procedure THTTPGet.GetString;
var
Msg: TMsg;
begin
if not Assigned(FThread) then
begin
FThread := THTTPGetThread.Create(FAcceptTypes, FAgent, FURL, FFileName, FUserName, FPassword, FPostQuery, FReferer,
FBinaryData, FUseCache, FProgress, False);
FThread.OnTerminate := ThreadDone;
if FWaitThread then
while Assigned(FThread)do
while PeekMessage(Msg, 0, 0, 0, PM_REMOVE)do
begin
TranslateMessage(Msg);
DispatchMessage(Msg);
end;
end
end;
procedure THTTPGet.Abort;
begin
if Assigned(FThread) then
begin
FThread.Terminate;
FThread.FTResult := False;
end;
end;
procedure THTTPGet.ThreadDone(Sender: TObject);
begin
FResult := FThread.FTResult;
if FResult then
if FThread.FTToFile then
if Assigned(FDoneFile) then
FDoneFile(Self, FThread.FTFileName, FThread.FTFileSize) else
else
if Assigned(FDoneString) then
FDoneString(Self, FThread.FTStringResult) else
else
if Assigned(FError) then
FError(Self);
FThread := nil;
end;
procedure Register;
begin
RegisterComponents('yjchen', [THTTPGet]);
end;
end.
