MFC HttpClient

 HttpClient.h
#ifndef HTTPCLIENT_H
#define HTTPCLIENT_H
#include <afxinet.h>
#include <string>
using namespace std;
#define  IE_AGENT  _T("Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; .NET CLR 2.0.50727)")
// 操作成功
#define SUCCESS        0
// 操作失败
#define FAILURE        1
// 操作超时 www.it165.net
#define OUTTIME        2
class CHttpClient
{
public:
    	CHttpClient(LPCTSTR strAgent = IE_AGENT);
    	virtual ~CHttpClient(void);
	
    	int HttpGet(LPCTSTR strUrl, LPCTSTR strPostData, CString &strResponse);
    	int HttpPost(LPCTSTR strUrl, LPCTSTR strPostData, CString &strResponse);
private:
  	 int ExecuteRequest(LPCTSTR strMethod, LPCTSTR strUrl, LPCTSTR strPostData, CString &strResponse);
    	void Clear();
private:
    CInternetSession *m_pSession;
    CHttpConnection *m_pConnection;
    CHttpFile *m_pFile;
};
#endif // HTTPCLIENT_H

// HttpClient.cpp
#include "StdAfx.h"
#include "HttpClient.h"

#define  BUFFER_SIZE       1024
#define  NORMAL_CONNECT             INTERNET_FLAG_KEEP_CONNECTION
#define  SECURE_CONNECT             NORMAL_CONNECT | INTERNET_FLAG_SECURE
#define  NORMAL_REQUEST             INTERNET_FLAG_RELOAD | INTERNET_FLAG_DONT_CACHE 
#define  SECURE_REQUEST             NORMAL_REQUEST | INTERNET_FLAG_SECURE | INTERNET_FLAG_IGNORE_CERT_CN_INVALID

CHttpClient::CHttpClient(LPCTSTR strAgent)
{
    m_pSession = new CInternetSession(strAgent);
    m_pConnection = NULL;
    m_pFile = NULL;
}

CHttpClient::~CHttpClient(void)
{
    Clear();
    if(NULL != m_pSession)
    {
        m_pSession->Close();
        delete m_pSession;
        m_pSession = NULL;
    }
}

void CHttpClient::Clear()
{
    if(NULL != m_pFile)
    {
        m_pFile->Close();
        delete m_pFile;
        m_pFile = NULL;
    }

    if(NULL != m_pConnection)
    {
        m_pConnection->Close();
        delete m_pConnection;
        m_pConnection = NULL;
    }
}

int CHttpClient::ExecuteRequest(LPCTSTR strMethod, LPCTSTR strUrl, LPCTSTR strPostData, CString &strResponse)
{
    CString strServer;
    CString strObject;
    DWORD dwServiceType;
    INTERNET_PORT nPort;
    strResponse = "";

    AfxParseURL(strUrl, dwServiceType, strServer, strObject, nPort);

    if(AFX_INET_SERVICE_HTTP != dwServiceType && AFX_INET_SERVICE_HTTPS != dwServiceType)
    {
        return FAILURE;
    }

    try
    {
        m_pConnection = m_pSession->GetHttpConnection(strServer,
            dwServiceType == AFX_INET_SERVICE_HTTP ? NORMAL_CONNECT : SECURE_CONNECT,
            nPort);
        m_pFile = m_pConnection->OpenRequest(strMethod, strObject, 
            NULL, 1, NULL, NULL, 
            (dwServiceType == AFX_INET_SERVICE_HTTP ? NORMAL_REQUEST : SECURE_REQUEST));

        m_pFile->AddRequestHeaders("Accept: *,*/*");
        //m_pFile->AddRequestHeaders("Accept-Language: zh-cn");
        m_pFile->AddRequestHeaders("Content-Type: application/x-www-form-urlencoded");
        //m_pFile->AddRequestHeaders("Accept-Encoding: gzip, deflate");

        m_pFile->SendRequest(NULL, 0, (LPVOID)(LPCTSTR)strPostData, strPostData == NULL ? 0 : _tcslen(strPostData));

        char szChars[BUFFER_SIZE + 1] = {0};
        CString strRawResponse = "";
        UINT nReaded = 0;
        while ((nReaded = m_pFile->Read((void*)szChars, BUFFER_SIZE)) > 0)
        {
            szChars[nReaded] = '\0';
            strRawResponse += szChars;
            memset(szChars, 0, BUFFER_SIZE + 1);
        }
        strResponse = strRawResponse;
        Clear();
    }
    catch (CInternetException* e)
    {
        Clear();
        DWORD dwErrorCode = e->m_dwError;
        e->Delete();
        DWORD dwError = GetLastError();
        if (ERROR_INTERNET_TIMEOUT == dwErrorCode)
        {
            return OUTTIME;
        }
        else
        {
            return FAILURE;
        }
    }
    return SUCCESS;
}

int CHttpClient::HttpGet(LPCTSTR strUrl, LPCTSTR strPostData, CString &strResponse)
{
    return ExecuteRequest("GET", strUrl, strPostData, strResponse);
}

int CHttpClient::HttpPost(LPCTSTR strUrl, LPCTSTR strPostData, CString &strResponse)
{
    return ExecuteRequest("POST", strUrl, strPostData, strResponse);
}