VS2008 C++ 利用WinHttp API获取Http请求/响应头部Header

http://www.cnblogs.com/LCCRNblog/p/3833472.html

这一篇博客中，实现了获取http请求/响应后的html源码，现在需要获取http请求/响应的头部Header。。通过对WinHttp Api的查看，现给出实现代码。。

 // WinHttpTest.cpp : 定义控制台应用程序的入口点。
 //
 //#include <stdafx.h>
 #include <vector>
 #include <winsock2.h>
 #include <Winhttp.h>
 //#include <urlmon.h>
 #include <windows.h>
 #include <iostream>
 #include <fstream>
 #include <string>
 #include "AtlBase.h"
 #include "AtlConv.h"
 using namespace std;
 #pragma comment(lib, "winhttp")//这一句不能省略
 string GetHost(string strUrl)
 {
    int indexHttp = strUrl.find("http://");
    if(indexHttp != -)
    {
        strUrl = strUrl.substr();
    }
    else
        return "";
    int indexSlash = strUrl.find("/");
    if(indexSlash != -)
    {
        return strUrl.substr(, indexSlash);
    }
    else
        return strUrl;
    return "";
 }
 string GetRequestStr(string strUrl)
 {
    int indexHttp = strUrl.find("http://");
    if(indexHttp != -)
    {
        strUrl = strUrl.substr();
    }
    else
        return "";
    int indexSlash = strUrl.find("/");
    if(indexSlash == -)
    {
        return "";
    }
    else
        return strUrl.substr(indexSlash);
 }
 void GetHtml(string strUrl)
 {
    string strHost = GetHost(strUrl);//获取Host
    string strRequestStr = GetRequestStr(strUrl);//获取请求路径
    USES_CONVERSION;
     //2014年7月9日10:02:29
     //LPCWSTR的定义 typedef const wchar_t* LPCWSTR;
     //LPSTR的定义   typedef char* LPCWSTR;
     //LPWSTR的定义  typedef wchar_t* LPWSTR;
    LPCWSTR host = A2CW(strHost.c_str());//string转换为常量指针类型
    LPCWSTR requestStr = A2CW(strRequestStr.c_str());
    //Variables
    DWORD dwSize = ;
    BOOL  bResults = FALSE;

    //Note the definition of HINTERNET
    HINTERNET  hSession = NULL,
        hConnect = NULL,
        hRequest = NULL;

    //2014年7月9日10:39:33
    //Search the WinHttp API
    //what to do when call the function WinHttpOpen？
    // Use WinHttpOpen to obtain a session handle.
    hSession = WinHttpOpen(L"WinHTTP Example/1.0",
        WINHTTP_ACCESS_TYPE_DEFAULT_PROXY,
        WINHTTP_NO_PROXY_NAME,
        WINHTTP_NO_PROXY_BYPASS, );
  // Specify an HTTP server.
    if (hSession)
        hConnect = WinHttpConnect(hSession, host,
        INTERNET_DEFAULT_HTTP_PORT, );
  // Create an HTTP request handle.
    if (hConnect)
        hRequest = WinHttpOpenRequest(hConnect, L"GET", requestStr,
        NULL, WINHTTP_NO_REFERER,
        NULL,
        NULL);
  // Send a request.
    if (hRequest)
        bResults = WinHttpSendRequest(hRequest,
        WINHTTP_NO_ADDITIONAL_HEADERS,
        , WINHTTP_NO_REQUEST_DATA, ,
        , );
 // End the request.
    if (bResults)
        bResults = WinHttpReceiveResponse(hRequest, NULL);

 //2014年7月9日16:35:40
 //获取请求Header
      LPVOID lpOutBuffer = NULL;
      int temp;
      if (bResults)
     {
         //此处的参数与获取响应的Header参数不同
         WinHttpQueryHeaders( hRequest, WINHTTP_QUERY_RAW_HEADERS_CRLF|WINHTTP_QUERY_FLAG_REQUEST_HEADERS,
                              WINHTTP_HEADER_NAME_BY_INDEX, NULL,
                              &dwSize, WINHTTP_NO_HEADER_INDEX);

         // Allocate memory for the buffer.
         if( GetLastError() == ERROR_INSUFFICIENT_BUFFER )
         {
             temp = dwSize/sizeof(WCHAR);
             lpOutBuffer = new WCHAR[temp];

             // Now, use WinHttpQueryHeaders to retrieve the header.
             bResults = WinHttpQueryHeaders( hRequest,
                                        WINHTTP_QUERY_RAW_HEADERS_CRLF|WINHTTP_QUERY_FLAG_REQUEST_HEADERS,
                                        WINHTTP_HEADER_NAME_BY_INDEX,
                                        lpOutBuffer, &dwSize,
                                        WINHTTP_NO_HEADER_INDEX);
         }

     }
     //两种输出方式。。输出header，此处cout行不通
     wcout<<(WCHAR*)lpOutBuffer;
     if (bResults)
        printf("\n%S",lpOutBuffer);

     delete [] lpOutBuffer;

  //2014年7月9日14:43:20 获取响应头部
      if (bResults)
     {
         WinHttpQueryHeaders( hRequest, WINHTTP_QUERY_RAW_HEADERS_CRLF,
                              WINHTTP_HEADER_NAME_BY_INDEX, NULL,
                              &dwSize, WINHTTP_NO_HEADER_INDEX);

         // Allocate memory for the buffer.
         if( GetLastError() == ERROR_INSUFFICIENT_BUFFER )
         {
             temp = dwSize/sizeof(WCHAR);
             lpOutBuffer = new WCHAR[temp];

             // Now, use WinHttpQueryHeaders to retrieve the header.
             bResults = WinHttpQueryHeaders( hRequest,
                                        WINHTTP_QUERY_RAW_HEADERS_CRLF,
                                        WINHTTP_HEADER_NAME_BY_INDEX,
                                        lpOutBuffer, &dwSize,
                                        WINHTTP_NO_HEADER_INDEX);
         }

     }
     //两种输出方式。。输出header，此处cout行不通
     wcout<<(WCHAR*)lpOutBuffer;
     if (bResults)
        printf("\n%S",lpOutBuffer);

     delete [] lpOutBuffer;
 }
 int _tmain(int argc, _TCHAR* argv[])
 {

    GetHtml("http://bbs.bccn.net/thread-294526-1-1.html");
    system("pause");
    return ;
 }