下载并显示网上的图片 - 回复 "fancy" 的问题

问题来源: http://www.cnblogs.com/del/archive/2008/07/29/1254211.html#1271136

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本例效果图:

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代码文件:

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unit Unit1;



interface



uses

  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,

  Dialogs, StdCtrls;



type

  TForm1 = class(TForm)

    Button1: TButton;

    procedure Button1Click(Sender: TObject);

  end;



var

  Form1: TForm1;



implementation



{$R *.dfm}



uses GDIPOBJ, GDIPAPI, UrlMon;



procedure TForm1.Button1Click(Sender: TObject);

const

  TestPath = 'c:\temp\net.gif';                      {下载后临时存放}

  DownUrl = 'http://del.cnblogs.com/Images/xml.gif'; {要下载的文件}

var

  img: TGPImage;

  g: TGPGraphics;

begin

  if UrlDownloadToFile(nil, DownUrl, TestPath, 0, nil) = 0 then

  begin

    img := TGPImage.Create(TestPath);

    g := TGPGraphics.Create(Canvas.Handle);

    g.DrawImage(img, 10, 10, img.GetWidth, img.GetHeight);

    g.Free;

    img.Free;

  end;

end;



end.


 
   

窗体文件:

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object Form1: TForm1

  Left = 0

  Top = 0

  Caption = 'Form1'

  ClientHeight = 127

  ClientWidth = 249

  Color = clBtnFace

  Font.Charset = DEFAULT_CHARSET

  Font.Color = clWindowText

  Font.Height = -11

  Font.Name = 'Tahoma'

  Font.Style = []

  OldCreateOrder = False

  PixelsPerInch = 96

  TextHeight = 13

  object Button1: TButton

    Left = 152

    Top = 80

    Width = 75

    Height = 25

    Caption = 'Button1'

    TabOrder = 0

    OnClick = Button1Click

  end

end