C++使用CHttpFile实现Http请求

//////////////////////////////////// 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);
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));

/*设置请求相关参数*/
m_pFile->AddRequestHeaders(L"Accept: */*,application/json");//accept请求报头域，表示客户端接受哪些类型的信息
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为实体报头域，格式及编码

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

/*请求body内容先转为UTF-8编码，与服务端保持一致,cword为要发送内容*/
char*cword; //ANSI指针
if (strPostData != NULL){
DWORD  num = WideCharToMultiByte(CP_UTF8, 0, strPostData, -1, NULL, 0, NULL, NULL);//計算這個UNICODE实际由几个UTF-8字組成
cword = (char*)calloc(num, sizeof(char));   //申请空间
if (cword == NULL)                          //是否申请
{
free(cword);
}
memset(cword, 0, num*sizeof(char));     //初始化
WideCharToMultiByte(CP_UTF8, 0, strPostData, -1, cword, num, NULL, NULL);
printf("content长度为%d\n", strlen(cword));
m_pFile->SendRequest(NULL, 0, cword, strlen(cword));//发送请求
}
else{
m_pFile->SendRequest(NULL, 0, NULL, 0);//发送请求
}

DWORD dwRet;
m_pFile->QueryInfoStatusCode(dwRet);//查询执行状态
printf("HTTP_STATUS_code:%d\n", dwRet);
if (dwRet == HTTP_STATUS_OK){//http请求执行失败
result = SUCCESS;
}

/*保存http响应*/
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转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;//最终响应结果
//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);
}