OnDone event
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OnDone event
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| WinHTTP component.
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| type
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| TWinHTTPDoneEvent = procedure(Sender: TObject;
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| const ContentType: String;
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| FileSize: Integer; Stream: TStream) of object;
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|
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| property OnDone: TWinHTTPDoneEvent;
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| The OnDone event occurs when the WinHTTP component has successfully downloaded requested data from the Web.
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| The component pass to the OnDone event handler 3 following parameters:
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| Parameters | Meaning
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| ContentType | the media type (also known as Multipurpose Internet Mail Extension (MIME) type) of downloaded data. For example if you downloaded usual text-file, the ContentType will be "text/plan". For HTML page ContentType will "text/html", for executable file — "application/binary" and "image/jpeg" for JPEG, JPG and JPE files.
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| For more information about Internet media types, please read RFC 2045, 2046, 2047, 2048, and 2077 (http://www.oac.uci.edu/indiv/ehood/MIME/MIME.html). Check out also the Internet media type registry at ftp://ftp.iana.org/in-notes/iana/assignments/media-types;
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| FileSize | size of downloaded data in bytes;
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| Stream | the memory stream which contains downloaded data (check out description of TMemoryStream class for more info). It can be nil (null) if the OutputFileName property was specified before request (before calling the Read method).
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| procedure TForm1.WinHTTP1Done(Sender: TObject;
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| ContentType: string; FileSize: Integer; Stream: TStream);
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| var
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| Str: String;
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| begin
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| if Stream = nil then
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| Exit; // can be already stored to file specified by OutputFileName
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| with Stream as TMemoryStream do
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| if OutToMemoBox1.Checked then // output to Memo1
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| begin
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| SetLength(Str, Size);
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| Stream.Read(Str[1], Size); // or Move(Memory^, Str[1], Size);
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| Memo1.Text := Str;
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| end
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| else
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| begin // save to file
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| Memo1.Text := 'Saved to c:\httptest.dat';
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| SaveToFile('c:\httptest.dat');
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| end;
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| StatusBar1.Panels[0].Text := 'Successfully downloaded ' + IntToStr(FileSize) + ' bytes';
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| end;
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| void __fastcall TForm1::WinHTTP1Done(TObject *Sender,
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| AnsiString ContentType, int FileSize, TStream *Stream)
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| {
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| AnsiString Str;
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| if (Out1->Checked) {
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| Str.SetLength(Stream->Size);
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| Move(((TMemoryStream*)Stream)->Memory, &Str[1], Stream->Size);
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| Memo1->Text = Str;
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| }else {
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| Memo1->Text = "Saved to c:\httptest.dat";
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| ((TMemoryStream*)Stream)->SaveToFile("c:\httptest.dat");
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| }
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| StatusBar1->Panels->Items[0]->Text = "Successfully downloaded " + IntToStr(FileSize) + " bytes";
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| }
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| OnProgress and OnHTTPError events; Read method;
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| OutputFileName and FileName properties.
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