获取指定地址的 JPG 图片 - 回复 "bangrj" 的问题-优快云博客

本文介绍了一种使用Delphi编程语言通过HTTP从指定URL下载图片的方法，并将其显示在应用程序界面上。该示例利用了IdHTTP组件来执行网络请求，同时使用了TJPEGImage类来处理和绘制图片。

问题来源: http://www.cnblogs.com/del/archive/2009/02/27/1370907.html#1463071

本例效果图:

代码文件:

unit Unit1;

interface

uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, IdBaseComponent, IdComponent, IdTCPConnection, IdTCPClient, IdHTTP,
  StdCtrls;

type
  TForm1 = class(TForm)
    Button1: TButton;
    IdHTTP1: TIdHTTP;
    procedure Button1Click(Sender: TObject);
  end;

var
  Form1: TForm1;

implementation

{$R *.dfm}

uses jpeg;

procedure TForm1.Button1Click(Sender: TObject);
const
  url = 'http://ptlogin2.qq.com/getimage?aid=15000701&0.9129723031485226';
var
  ms: TMemoryStream;
  jpg: TJPEGImage;
begin
  ms := TMemoryStream.Create;
  jpg := TJPEGImage.Create;

  IdHTTP1.Get(url, ms);
  ms.Position := 0;

  jpg.LoadFromStream(ms);
  Canvas.Draw(10, 10, jpg);

  jpg.Free;
  ms.Free;
end;

end.

窗体文件:

object Form1: TForm1
  Left = 0
  Top = 0
  Caption = 'Form1'
  ClientHeight = 126
  ClientWidth = 158
  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 = 40
    Top = 88
    Width = 75
    Height = 25
    Caption = 'Button1'
    TabOrder = 0
    OnClick = Button1Click
  end
  object IdHTTP1: TIdHTTP
    AllowCookies = True
    ProxyParams.BasicAuthentication = False
    ProxyParams.ProxyPort = 0
    Request.ContentLength = -1
    Request.Accept = 'text/html, */*'
    Request.BasicAuthentication = False
    Request.UserAgent = 'Mozilla/3.0 (compatible; Indy Library)'
    HTTPOptions = [hoForceEncodeParams]
    Left = 8
    Top = 8
  end
end

转载于:https://my.oschina.net/hermer/blog/320902