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。。
  1 // WinHttpTest.cpp : 定义控制台应用程序的入口点。
  2 //
  3 //#include <stdafx.h>
  4 #include <vector>
  5 #include <winsock2.h>
  6 #include <Winhttp.h>
  7 //#include <urlmon.h>
  8 #include <windows.h>
  9 #include <iostream>
 10 #include <fstream>
 11 #include <string>
 12 #include "AtlBase.h"
 13 #include "AtlConv.h"
 14 using namespace std;
 15 #pragma comment(lib, "winhttp")//这一句不能省略
 16 string GetHost(string strUrl)
 17 {
 18    int indexHttp = strUrl.find("http://");
 19    if(indexHttp != -1)
 20    {
 21        strUrl = strUrl.substr(7);
 22    }
 23    else
 24        return "";
 25    int indexSlash = strUrl.find("/");
 26    if(indexSlash != -1)
 27    {
 28        return strUrl.substr(0, indexSlash);
 29    }
 30    else
 31        return strUrl;
 32    return "";
 33 }
 34 string GetRequestStr(string strUrl)
 35 {
 36    int indexHttp = strUrl.find("http://");
 37    if(indexHttp != -1)
 38    {
 39        strUrl = strUrl.substr(7);
 40    }
 41    else
 42        return "";
 43    int indexSlash = strUrl.find("/");
 44    if(indexSlash == -1)
 45    {
 46        return "";
 47    }
 48    else
 49        return strUrl.substr(indexSlash);
 50 }
 51 void GetHtml(string strUrl)
 52 {
 53    string strHost = GetHost(strUrl);//获取Host
 54    string strRequestStr = GetRequestStr(strUrl);//获取请求路径
 55    USES_CONVERSION;
 56     //2014年7月9日10:02:29
 57     //LPCWSTR的定义 typedef const wchar_t* LPCWSTR;
 58     //LPSTR的定义   typedef char* LPCWSTR;
 59     //LPWSTR的定义  typedef wchar_t* LPWSTR;
 60    LPCWSTR host = A2CW(strHost.c_str());//string转换为常量指针类型
 61    LPCWSTR requestStr = A2CW(strRequestStr.c_str());
 62    //Variables
 63    DWORD dwSize = 0;
 64    BOOL  bResults = FALSE;
 65    
 66    //Note the definition of HINTERNET
 67    HINTERNET  hSession = NULL,
 68        hConnect = NULL,
 69        hRequest = NULL;
 70        
 71    //2014年7月9日10:39:33
 72    //Search the WinHttp API
 73    //what to do when call the function WinHttpOpen？
 74    // Use WinHttpOpen to obtain a session handle.
 75    hSession = WinHttpOpen(L"WinHTTP Example/1.0",
 76        WINHTTP_ACCESS_TYPE_DEFAULT_PROXY,
 77        WINHTTP_NO_PROXY_NAME,
 78        WINHTTP_NO_PROXY_BYPASS, 0);
 79  // Specify an HTTP server.
 80    if (hSession)
 81        hConnect = WinHttpConnect(hSession, host,
 82        INTERNET_DEFAULT_HTTP_PORT, 0);
 83  // Create an HTTP request handle.
 84    if (hConnect)
 85        hRequest = WinHttpOpenRequest(hConnect, L"GET", requestStr,
 86        NULL, WINHTTP_NO_REFERER,
 87        NULL,
 88        NULL);
 89  // Send a request.
 90    if (hRequest)
 91        bResults = WinHttpSendRequest(hRequest,
 92        WINHTTP_NO_ADDITIONAL_HEADERS,
 93        0, WINHTTP_NO_REQUEST_DATA, 0,
 94        0, 0);
 95 // End the request.
 96    if (bResults)
 97        bResults = WinHttpReceiveResponse(hRequest, NULL);
 98        
 99 //2014年7月9日16:35:40  
100 //获取请求Header
101      LPVOID lpOutBuffer = NULL;
102      int temp;
103      if (bResults)
104     {
105         //此处的参数与获取响应的Header参数不同
106         WinHttpQueryHeaders( hRequest, WINHTTP_QUERY_RAW_HEADERS_CRLF|WINHTTP_QUERY_FLAG_REQUEST_HEADERS,
107                              WINHTTP_HEADER_NAME_BY_INDEX, NULL,
108                              &dwSize, WINHTTP_NO_HEADER_INDEX);
109 
110         // Allocate memory for the buffer.
111         if( GetLastError() == ERROR_INSUFFICIENT_BUFFER )
112         {
113             temp = dwSize/sizeof(WCHAR);
114             lpOutBuffer = new WCHAR[temp];
115 
116             // Now, use WinHttpQueryHeaders to retrieve the header.
117             bResults = WinHttpQueryHeaders( hRequest,
118                                        WINHTTP_QUERY_RAW_HEADERS_CRLF|WINHTTP_QUERY_FLAG_REQUEST_HEADERS,
119                                        WINHTTP_HEADER_NAME_BY_INDEX,
120                                        lpOutBuffer, &dwSize,
121                                        WINHTTP_NO_HEADER_INDEX);
122         }
123         
124         
125     }
126     //两种输出方式。。输出header，此处cout行不通
127     wcout<<(WCHAR*)lpOutBuffer;
128     if (bResults)
129        printf("
%S",lpOutBuffer);
130        
131     delete [] lpOutBuffer;
132  
133  //2014年7月9日14:43:20 获取响应头部
134      if (bResults)
135     {
136         WinHttpQueryHeaders( hRequest, WINHTTP_QUERY_RAW_HEADERS_CRLF,
137                              WINHTTP_HEADER_NAME_BY_INDEX, NULL,
138                              &dwSize, WINHTTP_NO_HEADER_INDEX);
139 
140         // Allocate memory for the buffer.
141         if( GetLastError() == ERROR_INSUFFICIENT_BUFFER )
142         {
143             temp = dwSize/sizeof(WCHAR);
144             lpOutBuffer = new WCHAR[temp];
145 
146             // Now, use WinHttpQueryHeaders to retrieve the header.
147             bResults = WinHttpQueryHeaders( hRequest,
148                                        WINHTTP_QUERY_RAW_HEADERS_CRLF,
149                                        WINHTTP_HEADER_NAME_BY_INDEX,
150                                        lpOutBuffer, &dwSize,
151                                        WINHTTP_NO_HEADER_INDEX);
152         }
153         
154         
155     }
156     //两种输出方式。。输出header，此处cout行不通
157     wcout<<(WCHAR*)lpOutBuffer;
158     if (bResults)
159        printf("
%S",lpOutBuffer);
160        
161     delete [] lpOutBuffer;
162 }
163 int _tmain(int argc, _TCHAR* argv[])
164 {
165 
166    GetHtml("http://bbs.bccn.net/thread-294526-1-1.html");
167    system("pause");
168    return 0;
169 }