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Ladda en JPEG-bild från internet
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Kategori: Internet
Inlagt: 2005-05-21
Läst: 1460
Inlagt av: Staffan Berg
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Beskrivning |
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Ladda en JPEG-bild från internet med hjälp av detta exempel. Vilka komponenter som krävs framgår av uses-listan.
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Kod |
unit Unit1;
interface
uses
Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls,
Forms,
Dialogs, ExtCtrls, StdCtrls, IdBaseComponent, IdComponent,
IdTCPConnection, IdTCPClient, IdHTTP,jpeg, ComCtrls,
IdAntiFreezeBase,
IdAntiFreeze;
type
TForm1 = class(TForm)
Client: TIdHTTP;
bGetImage: TButton;
ImageFromNet: TImage;
IdAntiFreeze1: TIdAntiFreeze;
ProgressBar: TProgressBar;
Label1: TLabel;
procedure bGetImageClick(Sender: TObject);
procedure ClientWorkBegin(Sender: TObject; AWorkMode: TWorkMode;
const AWorkCountMax: Integer);
procedure ClientWork(Sender: TObject; AWorkMode: TWorkMode;
const AWorkCount: Integer);
procedure ClientWorkEnd(Sender: TObject; AWorkMode: TWorkMode);
private
{ Private declarations }
public
{ Public declarations }
end;
var
Form1: TForm1;
implementation
{$R *.dfm}
procedure TForm1.bGetImageClick(Sender: TObject);
var imagestream : TStringSTream;
jpg : TJPEGIMAGE;
begin
Label1.Caption := '';
ImageFromNet.Picture := nil;
imagestream := TStringStream.Create(''); //this will hold the http
stream
jpg := TJPEGIMAGE.Create;
try
Client.Get('http://www.fuzzydizzie.com/sb.jpg',imagestream);
//get the image
imagestream.Seek(0,sofrombeginning); //go to the beginning of the
stream
jpg.LoadFromStream(imagestream); //this will load the stream into
the JPEG object
ImageFromNet.Picture.Assign(jpg); //Finally load the jpeg .. :)
except
ShowMessage('An error occured while loading the jpeg from the
NET');
end;
jpg.Free;
imagestream.Free;
end;
procedure TForm1.ClientWorkBegin(Sender: TObject; AWorkMode:
TWorkMode;
const AWorkCountMax: Integer);
begin
ProgressBar.Max := AWorkCountMax;
ProgressBar.Position := 0;
end;
procedure TForm1.ClientWork(Sender: TObject; AWorkMode: TWorkMode;
const AWorkCount: Integer);
begin
ProgressBar.Position := AWorkCount;
end;
procedure TForm1.ClientWorkEnd(Sender: TObject; AWorkMode: TWorkMode);
begin
Label1.Caption := 'Image received !'
end;
end.
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