这里是我修改后的HTTPGet控件，可以Post大数据文件，但是只是生数据而已，不同于IE上传文件的标准
相关标准参看RFC1867标准
{*************************************************************}
{ HTTPGet component for Delphi 32 }
{ Version: 1.94 }
{ E-Mail: info@utilmind.com }
{ WWW: http://www.utilmind.com }
{ Created: October 19, 1999 }
{ Modified: June 6, 2000 }
{ Legal: Copyright (c) 1999-2000, UtilMind Solutions }
{*************************************************************}
{ PROPERTIES: }
{ Agent: String - User Agent }
{ }
{* BinaryData: Boolean - This setting specifies which type }
{* of data will taken from the web. }
{* If you set this property TRUE then }
{* component will determinee the size }
{* of files *before* getting them from }
{* the web. }
{* If this property is FALSE then as we}
{* do not knows the file size the }
{* OnProgress event will doesn't work. }
{* Also please remember that is you set}
{* this property as TRUE you will not }
{* capable to get from the web ASCII }
{* data and ofter got OnError event. }
{ }
{ FileName: String - Path to local file to store the data }
{ taken from the web }
{ Password, UserName - set this properties if you trying to }
{ get data from password protected }
{ directories. }
{ Referer: String - Additional data about referer document }
{ URL: String - The url to file or document }
{ UseCache: Boolean - Get file from the Internet Explorer's }
{ cache if requested file is cached. }
{*************************************************************}
{ METHODS: }
{ GetFile - Get the file from the web specified in the URL }
{ property and store it to the file specified in }
{ the FileName property }
{ GetString - Get the data from web and return it as usual }
{ String. You can receive this string hooking }
{ the OnDoneString event. }
{ Abort - Stop the current session }
{*************************************************************}
{ EVENTS: }
{ OnDoneFile - Occurs when the file is downloaded }
{ OnDoneString - Occurs when the string is received }
{ OnError - Occurs when error happend }
{ OnProgress - Occurs at the receiving of the BINARY DATA }
{*************************************************************}
{ Please see demo program for more information. }
{*************************************************************}
{ IMPORTANT NOTE: }
{ This software is provided 'as-is', without any express or }
{ implied warranty. In no event will the author be held }
{ liable for any damages arising from the use of this }
{ software. }
{ Permission is granted to anyone to use this software for }
{ any purpose, including commercial applications, and to }
{ alter it and redistribute it freely, subject to the }
{ following restrictions: }
{ 1. The origin of this software must not be misrepresented, }
{ you must not claim that you wrote the original software. }
{ If you use this software in a product, an acknowledgment }
{ in the product documentation would be appreciated but is }
{ not required. }
{ 2. Altered source versions must be plainly marked as such, }
{ and must not be misrepresented as being the original }
{ software. }
{ 3. This notice may not be removed or altered from any }
{ source distribution. }
{*************************************************************}
unit HTTPGet;
interface
uses
Windows, Messages, SysUtils, Classes, WinInet;
type
TOnProgressEvent = procedure(Sender: TObject; FisDown:boolean; 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,FisDown: Boolean;
FTFileSize: Integer;
FTToFile: Boolean;
FTFromFile: 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, aFromFile: Boolean);
end;
THTTPGet = class(TComponent)
private
FAcceptTypes: String;
FAgent: String;
FBinaryData: Boolean;
FURL: String;
FUseCache: Boolean;
FFromFile: Boolean;
FFileName: String;
FUserName: String;
FPassword: String;
FPostQuery: String;
FReferer: String;
FStringResult: string;
FWaitThread: Boolean;
FThread: THTTPGetThread;
FError: TNotifyEvent;
FResult: integer;
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 FromFile: Boolean read FFromFile write FFromFile;
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 StringResult: string read FStringResult;
property Result: integer read FResult;
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, aFromFile: 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;
FTFromFile := aFromFile;
Resume;
end;
procedure THTTPGetThread.UpdateProgress;
begin
FTProgress(Self, FisDown , FTFileSize, BytesReaded);
end;
procedure THTTPGetThread.Execute;
var
hSession, hConnect, hRequest: hInternet;
HostName, FileName: String;
Port: integer;
f: File;
f2: TFileStream;
Buf: Pointer;
BufferIn: INTERNET_BUFFERS;
dwBufLen, dwIndex: DWord;
Data: Array[0..$FFFF] of Char;
TempStr: String;
RequestMethod: PChar;
InternetFlag: DWord;
AcceptType: LPStr;
procedure ParseURL(URL: String; var HostName, FileName: String; var Port:integer);
procedure ReplaceChar(c1, c2: Char; var St: String);
var
p: Integer;
begin
while True do
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);
if i=0 then i:=length(URL)-1;
HostName := Copy(URL, 1, i - 1);
FileName := Copy(URL, i, Length(URL) - i + 1);
i := Pos(':', HostName);
Port:=80;
if i>0 then
begin
Port := StrToIntDef(Copy(HostName, i+1, Length(HostName) - i),80);
HostName := Copy(HostName, 1, i - 1);
end;
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, Port);
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),
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
begin
if FTFromFile then
begin
FisDown:=False;
BufferIn.Next:=0;
BufferIn.lpcszHeader:=0;
BufferIn.dwHeadersLength:=0;
BufferIn.dwHeadersTotal:=0;
BufferIn.lpvBuffer:=0;
BufferIn.dwBufferLength:=0;
BufferIn.dwOffsetLow:=0;
BufferIn.dwOffsetHigh:=0;
BufferIn.dwStructSize:=sizeof(INTERNET_BUFFERS);
//AssignFile(f2, FTPostQuery);
//Reset(f2,1);
f2:=TFileStream.Create(FTPostQuery,fmOpenRead+fmShareDenyNone);
BufferIn.dwBufferTotal:=f2.Size;
FTFileSize:=BufferIn.dwBufferTotal;
dwIndex:=0;
BytesReaded:=0;
if HttpSendRequestEx(hRequest, @BufferIn, 0, 0, 0) then
repeat
//BlockRead(f2, Data, SizeOf(Data), BytesToRead);
BytesToRead:=f2.Read(Data,SizeOf(Data));
if not InternetWriteFile(hRequest, @Data, BytesToRead, BytesToRead) then Break;
dwIndex:=dwIndex+BytesToRead;
inc(BytesReaded, BytesToRead);
if Assigned(FTProgress) then
Synchronize(UpdateProgress);
until (BytesToRead <> SizeOf(Data)) ;
HttpEndRequest(hRequest, 0, 0, 0);
f2.Destroy;
end
else
HttpSendRequest(hRequest, 'Content-Type: application/x-www-form-urlencoded', 47,
PChar(FTPostQuery), Length(FTPostQuery));
end;
if Terminated then
begin
CloseHandles;
FTResult := False;
Exit;
end;
dwIndex := 0;
dwBufLen := 1024;
GetMem(Buf, dwBufLen);
FisDown:=True;
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 True do
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, FFromFile);
FThread.OnTerminate := ThreadDone;
if FWaitThread then
while Assigned(FThread) do
while PeekMessage(Msg, 0, 0, 0, PM_REMOVE) do
begin
Sleep(20);
TranslateMessage(Msg);
DispatchMessage(Msg);
end;
end
end;
procedure THTTPGet.GetString;
var
Msg: TMsg;
begin
FStringResult:='';
if not Assigned(FThread) then
begin
FThread := THTTPGetThread.Create(FAcceptTypes, FAgent, FURL, FFileName, FUserName, FPassword, FPostQuery, FReferer,
FBinaryData, FUseCache, FProgress, False, FFromFile);
FThread.OnTerminate := ThreadDone;
if FWaitThread then
while Assigned(FThread) do
while PeekMessage(Msg, 0, 0, 0, PM_REMOVE) do
begin
Sleep(20);
if FThread=nil then break;
TranslateMessage(Msg);
DispatchMessage(Msg);
end;
end
{ if FWaitThread then
WaitForSingleObject(FThread.Handle,6000);
{while WaitForSingleObject(FThread.Handle,20)<> WAIT_ABANDONED do
begin
TranslateMessage(Msg);
DispatchMessage(Msg);
end;
while PeekMessage(Msg, 0, 0, 0, PM_REMOVE) or (FThread<>nil) do
begin
if (FThread<>nil) then if FThread.Terminated then break;
Sleep(20);
TranslateMessage(Msg);
DispatchMessage(Msg);
end;
end }
end;
procedure THTTPGet.Abort;
begin
if Assigned(FThread) then
begin
FThread.Terminate;
FThread.FTResult := False;
FResult:= -1;
end;
end;
procedure THTTPGet.ThreadDone(Sender: TObject);
begin
if FThread.FTResult then FResult:=1 else FResult:=0;
if FResult=1 then
if FThread.FTToFile then
if Assigned(FDoneFile) then FDoneFile(Self, FThread.FTFileName, FThread.FTFileSize) else
else
begin
FStringResult:=FThread.FTStringResult;
if Assigned(FDoneString) then FDoneString(Self, FThread.FTStringResult) else
end
else
if Assigned(FError) then FError(Self);
FThread := nil;
end;
procedure Register;
begin
RegisterComponents('UtilMind', [THTTPGet]);
end;
end.
