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