利用C语言实现POST数据，以下是我写的代码，但返回数据是空，求高手指教
#include "stdio.h"
#include "stdlib.h"
#include "winsock2.h"
#pragma comment(lib,"ws2_32.lib")
int main(int argc, char* argv[])
{

SOCKET hsocket;
SOCKADDR_IN saServer;
WSADATA wsadata;
LPHOSTENT lphostent;
int nRet;
char Dest[3000];
char* host_name="http://www.baidu.com/";
char* req="GET / HTTP/1.1\r\n" //此为要发送的数据包
"Accept: image/gif, image/x-xbitmap, image/jpeg, image/pjpeg, application/x-shockwave-flash, application/vnd.ms-excel, application/vnd.ms-powerpoint, application/msword, */*\r\n"
"Accept-Encoding: gzip, deflate\r\n"
"Accept-Language: zh-cn\r\n"
"Connection: Keep-Alive\r\n"
"Cookie: BAIDUID=2117178CCBCFAC00102E289A601B4AAD:FG=1; BDUSS=21sZUxVbUtKbkkyZW84dTF5NVZqRlZtUjRpamlFeG9iQmo0Y2owODF4eEF0fkpRQVFBQUFBJCQAAAAAAAAAAAokNw4JWvgTeXVhbjg1NzgxAAAAAAAAAAAAAAAAAAAAAAAAAAAAAACAYIArMAAAAOD6RHMAAAAALWdCAAAAAAAxMC4zNi4xNEBpBVBAaQVQM; BDUT=dl7o2117178CCBCFAC00102E289A601B4AAD138a304254a38\r\n"
"Host: www.baidu.com\r\n"
"User-Agent: Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; .NET CLR 1.1.4322; .NET CLR 2.0.50727)\r\n";

// 初始化套接字
if(WSAStartup(MAKEWORD(2,2),&wsadata))
printf("初始化SOCKET出错！");
lphostent=gethostbyname(host_name);
if(lphostent==NULL)
printf("lphostent为空！");
hsocket = socket(AF_INET,SOCK_STREAM,IPPROTO_TCP);
saServer.sin_family = AF_INET;
saServer.sin_port = htons(80);
saServer.sin_addr =*((LPIN_ADDR)*lphostent->h_addr_list);
// 利用SOCKET连接
nRet = connect(hsocket,(LPSOCKADDR)&saServer,sizeof(SOCKADDR_IN));
if(nRet == SOCKET_ERROR)
{
printf("建立连接时出错！");
closesocket(hsocket);
return 0;
}
// 利用SOCKET发送

nRet = send(hsocket,req,strlen(req),0);
if(nRet==SOCKET_ERROR)
{
printf("发送数据包时出错！");
closesocket(hsocket);
}
nRet=1;
while(nRet>0)
{
// 接收返回数据包
nRet=recv(hsocket,(LPSTR)Dest,sizeof(Dest),0);
if(nRet>0)
Dest[nRet]=0;
else
Dest[0]=0;
// 显示返回数据包的大小、内容
printf("\nReceived bytes:%d\n",nRet);
printf("Result:\n%s",Dest);
}
}

[解决办法]
req要以\r\n\r\n结尾，你的少了一个\r\n。
[解决办法]
String ResponseText = Net::WebClient::GetResponseText(T("http://www.baidu.com"));

http://blog.csdn.net/rrrfff/article/details/7340074