MFC实现http连接、发送和接收数据

	#include <afxinet.h>
	// 设置超时
	cinternetsession session;
	session.setoption(internet_option_connect_timeout, 2000);
	session.setoption(internet_option_connect_retries, 3);
	session.setoption(internet_option_send_timeout, 10000);
	session.setoption(internet_option_receive_timeout, 20000);
	// 打开http连接
	chttpconnection *phttpconnection = session.gethttpconnection(strhost, internet_flag_keep_connection, iport);
	if (null == phttpconnection) 
	{
		return false;
	}
	// 开启一个http请求
	chttpfile *phttpfile = phttpconnection->openrequest(_t("post"), strrequesturl,	null, 1, null, null, internet_flag_keep_connection);
	if (null == phttpfile) {
		return false;
	}
	// 设置http请求包头
	phttpfile->addrequestheaders(_t("user-agent: myproduct/1.0.0 (windows)"));
	phttpfile->addrequestheaders(_t("content-type: application/octet-stream"));  
	phttpfile->addrequestheaders(_t("charset: utf-8"));
	// 发送数据
	bool bresult = phttpfile->sendrequest(null, 0, (lpvoid)output.data(), (dword)output.length());
	if (!bresult) {
		return false;
	}
	// 查询状态
	dword dwhttpcode = 0;
	bresult = phttpfile->queryinfostatuscode(dwhttpcode);
	if (!bresult)
	{
		return false;
	}
	// 出错的原因
	if ((dwhttpcode < 200) || (dwhttpcode >= 300))
	{
		bool bresult = phttpfile->queryinfo(http_query_status_text, szbuffer, &dwbuffersize);
	}
	// 接收响应
	while ((nreadbytes = phttpfile->read((void*)szbuffer, 4096)) > 0) 
	{
		buffer.write(szbuffer, nreadbytes);
		memset(szbuffer, 0, 4096 * sizeof(char));
	}
	// 释放资源
	if (null != phttpfile) {
		phttpfile->close();
		delete phttpfile;
		phttpfile = null;
	}
	if (null != phttpconnection) {
		phttpconnection->close();
		delete phttpconnection;
		phttpconnection = null;
	}
	session.close();

　以上为伪代码示范过程。