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笔者最近开发系统中需要写个下载文件功能以前用BCBAPI写很烦琐忽然想起有个API就可以搞定了于是大早就来搜索这个API就是UrlDownloadToFile不仅如此Delphi些Control控件也可以轻松实现下载如NMHTTP指定NMHTTP1.InputFileMode := ture; 指定Body为本地文件名指定Get就可以下载了下面是详细代码均出自CSDN我把它们都整理到这儿让大家方便查阅


uses UrlMon;
function DownloadFile(Source, Dest: ): Boolean;
begin
  try
    Result := UrlDownloadToFile(nil, PChar(source), PChar(Dest), 0, nil) = 0;
    except
      Result := False;
    end;
  end;
  
   DownloadFile(''http://www.borland.com/delphi6.zip, ''c:\kylix.zip'') then
ShowMessage(''Download succesful'')
ShowMessage(''Download unsuccesful'')





例程:



Uses URLMon, ShellApi;
function DownloadFile(SourceFile, DestFile: ): Boolean;
begin
try
Result := UrlDownloadToFile(nil, PChar(SourceFile), PChar(DestFile), 0, nil) = 0;
except
Result := False;
end;
end;

procedure TForm1.Button1.Click(Sender: TObject);
const
// URL Location
SourceFile := ''http://www.google.com/l/de/images/home_title.g'';
// Where to save the file
DestFile := ''c:\temp\google-image.g'';
begin
   DownloadFile(SourceFile, DestFile) then
  begin
    ShowMessage(''Download succesful!'');
    // Show downloaded image in your browser
ShellExecute(Application.Handle,PChar(''open''),PChar(DestFile),PChar(''''),nil,SW_NORMAL)
  end
  
  ShowMessage(''Error while downloading '' + SourceFile)
end;




=

加入如下代码:



NMHTTP1.InputFileMode := ture;
NMHTTP1.Body := ''本地文件名'';
NMHTTP1.Header := ''Head.txt'';
NMHTTP1.OutputFileMode := FALSE;
NMHTTP1.ReportLevel := Status_Basic;
NMHTTP1.Proxy := ''代理服务器IP地址'';
NMHTTP1.ProxyPort := ''代理服务器端口号'';
With NMHTTP1.HeaderInfo do
  
  Begin
    Cookie := '''';
    LocalMailAddress := '''';
    LocalProgram := '''';
    Referer := '''';
    UserID := ''用户名称'';
    Password := ''用户口令'';
    End;
    
    NMHTTP1.Get(‘http://www.abcdefg.com/software/a.zip'');




试试吧Delphi目录中有TNMHTTPControl控件例子NT4+,Win95+,IE3+,你可以用URL Moniker功能



uses URLMon;

...

OleCheck(URLDownloadToFile(nil,''URL'',''Filename'',0,nil));




其中最后个参数你还可以传入个IBindStatusCallback实现以跟踪下载进度或控制中止下载简单场合句话就搞定了

BTW, URL Moniker封装了大多数URL而不是像NMHTTP那样封装协议因此你可以用URLDownloadToFile下载HTTPFTP甚至本地文件和局域网文件还有其他custom moniker比如MSITSTORE(MSDN Library文档moniker实现)




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;

//---------------------------




结束