Delphi 用WinInet 单元实现 POST提交数据

由于贪方便，用idhttp控件实现POST部分。结果发现频繁提交的时候总产生10054 等N多不可控错误。遂想换其它方法。百度找了下。基本都是靠webbrowser 、idhttp等控件提交的。于是，摸索着用 wininet.dll的api自己实现了一个webpost。效果不错。特地贴上方便自己以后检索。

代码：

function WebPagePost(sURL,sPostData:string):Pointer;stdcall;const  RequestMethod = 'POST';  HTTP_VERSION  = 'HTTP/1.1';  //HTTP版本 我抓包看过 HTTP/1.0 HTTP/1.1。尚未仔细了解其区别。按MSDN来写的。留空默认是1.0var  dwSize:DWORD;  dwFileSize: Int64;  dwBytesRead,dwReserved:DWORD;  hInte,hConnection,hRequest:HInternet;  ContentSize:array[1..1024] of Char;  HostPort:Integer;  HostName,FileName,sHeader:String;  procedure ParseURL(URL: string;var HostName,FileName:string;var HostPort:Integer);  var    i,p,k: DWORD;    function StrToIntDef(const S: string; Default: Integer): Integer;    var      E: Integer;    begin      Val(S, Result, E);      if E <> 0 then Result := Default;    end;  begin    if lstrcmpi('http://',PChar(Copy(URL,1,7))) = 0 then System.Delete(URL, 1, 7);    HostName := URL;    FileName := '/';    HostPort := INTERNET_DEFAULT_HTTP_PORT;    i := Pos('/', URL);    if i <> 0 then    begin      HostName := Copy(URL, 1, i-1);      FileName := Copy(URL, i, Length(URL) - i + 1);    end;    p:=pos(':',HostName);    if p <> 0 then    begin      k:=Length(HostName)-p;      HostPort:=StrToIntDef(Copy(HostName,p+1,k),INTERNET_DEFAULT_HTTP_PORT);      Delete(HostName,p,k+1);    end;  end;begin  Result := Pointer(-1);  dwFileSize :=0;  ParseURL(sURL,HostName,FileName,HostPort);  // 函数原型见 http://technet.microsoft.com/zh-cn/subscriptions/aa385096(v=vs.85).aspx  hInte := InternetOpen('', //UserAgent                           INTERNET_OPEN_TYPE_PRECONFIG,nil,nil,0);  if hInte<>nil then  begin    hConnection := InternetConnect(hInte,   // 函数原型见 http://technet.microsoft.com/zh-cn/query/ms909418                                   PChar(HostName),                                   HostPort,                                   nil,                                   nil,                                   INTERNET_SERVICE_HTTP,                                   0,                                   0);    if hConnection<>nil then    begin      hRequest := HttpOpenRequest(hConnection,  // 函数原型见 http://msdn.microsoft.com/zh-cn/library/aa917871                                  PChar(RequestMethod),                                  PChar(FileName),                                  HTTP_VERSION,                                  '', //Referrer 来路                                  nil,//AcceptTypes 接受的文件类型 TEXT/HTML */*                                  INTERNET_FLAG_NO_CACHE_WRITE or                                  INTERNET_FLAG_RELOAD,                                  0);      if hRequest<>nil then      begin        sHeader := 'Content-Type: application/x-www-form-urlencoded' + #13#10;    //    +'CLIENT-IP: 216.13.23.33'+#13#10    //    'X-FORWARDED-FOR: 216.13.23.33' + #13#10+; 伪造代理IP        // 函数原型见 http://msdn.microsoft.com/zh-cn/library/aa384227(v=VS.85)        HttpAddRequestHeaders(hRequest,PChar(sHeader),                              Length(sHeader),                              HTTP_ADDREQ_FLAG_ADD or HTTP_ADDREQ_FLAG_REPLACE);        // 函数原型见 http://msdn.microsoft.com/zh-cn/library/windows/desktop/aa384247(v=vs.85).aspx        if HttpSendRequest(hRequest,nil,0,PChar(sPostData),Length(sPostData)) then        begin          dwReserved:=0;          dwSize:=SizeOf(ContentSize);          // 函数原型 http://msdn.microsoft.com/zh-cn/subscriptions/downloads/aa384238.aspx          if HttpQueryInfo(hRequest,HTTP_QUERY_CONTENT_LENGTH,@ContentSize,dwSize,dwReserved) then          begin            dwFileSize:=StrToInt(StrPas(@ContentSize));            GetMem(Result, dwFileSize);            InternetReadFile(hRequest,Result,dwFileSize,dwBytesRead);          end;        end;      end;      InternetCloseHandle(hRequest);    end;    InternetCloseHandle(hConnection);  end;  InternetCloseHandle(hInte);end;

调用方法:

WebPagePost('http://www.xxx.com/register.php','user=xxx;pass=xxx');