Delphi使用通过WinHTTP下载的文件保存到磁盘

相关资料：

https://www.jb51.cc/delphi/103143.html 使用Delphi XE将通过WinHTTP下载的文件保存到磁盘

https://www.cnblogs.com/huangjacky/archive/2009/12/30/1635830.html Delphi - 我的代码之简单封装WinHttpRequest

实例：下面这代码是我下载ZIP包时用到的，亲证可用。

{$APPTYPE CONSOLE}
 
uses
  Variants,ActiveX,Classes,AxCtrls,WinHttp_TLB,SysUtils;
 
 
function Download(const url,filename: String): Boolean;
var
   http: IWinHttpRequest;
   wUrl: WideString;
   fs:TFileStream;
   HttpStream :IStream;
   sz,wr:Int64;
   FStatus : Integer;
   OleStream: TOleStream;
begin
  try
   wUrl := url;
   http := CoWinHttpRequest.Create;
   http.open('GET',False);
   http.send(EmptyParam);
 
   FStatus := http.status; // 200=OK!
   result := FStatus=200;
 
   if result then
   begin
    HttpStream:=IUnknown(http.ResponseStream) as IStream;
    OleStream:= TOleStream.Create(HttpStream);
    try
      fs:= TFileStream.Create(FileName,fmCreate);
      try
        OleStream.Position:= 0;
        fs.CopyFrom(OleStream,OleStream.Size);
      finally
        fs.Free;
      end;
    finally
      OleStream.Free;
    end;
   end;
 
  except
      result := false;
      // do not raise exceptions.
  end;
end;
 
 
begin
  try
    Download('http://foo.html','C:\Foo\anyfile.foo');
  except
    on E: Exception do
      Writeln(E.ClassName,': ',E.Message);
  end;
end.