delphi 从http 上下载文件的几种方法_delphi urldownloadtofile下载文件失败-优快云博客

本文介绍使用Delphi进行文件下载的两种方法：一种是通过UrlMon单元提供的UrlDownloadToFile函数，另一种是借助IdHTTP组件来完成文件下载任务。这两种方法均可有效实现从远程服务器下载文件到本地。

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1、利用函数：
unit downloadTest;
interface
uses
Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
Dialogs, StdCtrls,UrlMon;
type
TForm1 = class(TForm)
Button1: TButton;
procedure Button1Click(Sender: TObject);
private
{ Private declarations }
public
{ Public declarations }
end;
var
Form1: TForm1;
implementation
{$R *.dfm}
//文件下载
function DownloadFile(Source, Dest: string): Boolean;
begin
try
Result := UrlDownloadToFile(nil, PChar(source), PChar(Dest), 0, nil) = 0;
except
Result := False;
end;
end;
procedure TForm1.Button1Click(Sender: TObject);
var filedir,downloadUrl:string;
begin
filedir :='D:\delphi\download\client.zip';
downloadUrl :='http://download.pingan.com.cn/bank/client.zip';
if DownloadFile(downloadUrl,filedir) then
showMessage('文件下载成功')
else
showMessage('文件下载失败');
end;
end.

2、用IdHTTP控件吧！
var
DownLoadFile:TFileStream;
beginio
DownLoadFile:=TFileStream.Create('c:\aa.rar',fmCreate);
IdHTTP1.Get('http://www.sina.com.cn/download/aa.rar',DownLoadFile);
DownLoadFile.Free;
end;