C++實現http請求的程式碼，參照網上的修改了下在mfc中使用

1、HttpClient.h

//////////////////////////////////// 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
// 操作失敗
#define FAILURE        1
// 操作超時 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);
	int HttpPut(LPCTSTR strUrl, LPCTSTR strPostData, CString &strResponse);

private:
	int ExecuteRequest(int 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(int strMethod, LPCTSTR strUrl, LPCTSTR strPostData, CString &strResponse)
{
	int result =FAILURE ;
	//WCHAR* wPostData = strPostData.GetBuffer();
	CString strServer;
	CString strObject;
	DWORD dwServiceType;
	INTERNET_PORT nPort;


	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));

		/*設定請求相關引數*/
		m_pFile->AddRequestHeaders(L"Accept: */*,application/json");//accept請求報頭域，表示客戶端接受哪些型別的資訊
		m_pFile->AddRequestHeaders(L"Accept-Charset:UTF8");
		m_pFile->AddRequestHeaders(L"Accept-Language: zh-cn;q=0.8,en;q=0.6,ja;q=0.4");
		m_pFile->AddRequestHeaders(L"Content-Type:application/json");//content為實體報頭域，格式及編碼

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

		/*請求body內容先轉為UTF-8編碼，與服務端保持一致,cword為要傳送內容*/
		char*cword; //ANSI指標
		if (strPostData != NULL){
			DWORD  num = WideCharToMultiByte(CP_UTF8, 0, strPostData, -1, NULL, 0, NULL, NULL);//計算這個UNICODE實際由幾個UTF-8字組成
			cword = (char*)calloc(num, sizeof(char));   //申請空間
			if (cword == NULL)                          //是否申請
			{
				free(cword);
			}
			memset(cword, 0, num*sizeof(char));     //初始化
			WideCharToMultiByte(CP_UTF8, 0, strPostData, -1, cword, num, NULL, NULL);
			printf("content長度為%d\n", strlen(cword));
			m_pFile->SendRequest(NULL, 0, cword, strlen(cword));//傳送請求
		}
		else{
			m_pFile->SendRequest(NULL, 0, NULL, 0);//傳送請求
		}
		

		DWORD dwRet;
		m_pFile->QueryInfoStatusCode(dwRet);//查詢執行狀態
		printf("HTTP_STATUS_code:%d\n", dwRet);
		if (dwRet == HTTP_STATUS_OK){//http請求執行失敗
			result = SUCCESS;
		}

		/*儲存http響應*/
		char szChars[BUFFER_SIZE + 1] = { 0 };
		string 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);
		}

		/*utf8轉unicode*/
		int unicodeLen = MultiByteToWideChar(CP_UTF8, 0, strRawResponse.c_str(), -1, NULL, 0);
		WCHAR *pUnicode = new WCHAR[unicodeLen + 1];
		memset(pUnicode, 0, (unicodeLen + 1)*sizeof(wchar_t));
		MultiByteToWideChar(CP_UTF8, 0, strRawResponse.c_str(), -1, pUnicode, unicodeLen);
		strResponse = pUnicode;//最終響應結果
		//TRACE(strResponse + L"");
		delete[]pUnicode;
		pUnicode = NULL;
		
		Clear();
	}
	catch (CInternetException* e)
	{
		Clear();
		DWORD dwErrorCode = e->m_dwError;
		e->Delete();

		DWORD dwError = GetLastError();

		printf("dwError = %d", dwError, 0);

		strResponse = L"CInternetException\n";

		if (ERROR_INTERNET_TIMEOUT == dwErrorCode)
		{
			return OUTTIME;
		}
		else
		{
			return FAILURE;
		}
	}
	return result;
}

int CHttpClient::HttpGet(LPCTSTR strUrl, LPCTSTR strPostData, CString &strResponse)
{
	return ExecuteRequest(CHttpConnection::HTTP_VERB_GET, strUrl, NULL, strResponse);
}

int CHttpClient::HttpPost(LPCTSTR strUrl, LPCTSTR strPostData, CString &strResponse)
{
	return ExecuteRequest(CHttpConnection::HTTP_VERB_POST, strUrl, strPostData, strResponse);
}
int CHttpClient::HttpPut(LPCTSTR strUrl, LPCTSTR strPostData, CString &strResponse)
{
	return ExecuteRequest(CHttpConnection::HTTP_VERB_PUT, strUrl, strPostData, strResponse);
}