c++ 下載網頁(使用WinHttp)

本文轉載自查看原文 2012-02-16 17:11 3995 C++

// WinHttpTest.cpp : 定義控制台應用程序的入口點。
//
#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;
string GetHost( string strUrl)
{
     int indexHttp = strUrl.find( " http:// ");
     if(indexHttp != - 1)
    {
        strUrl = strUrl.substr( 7);
    }
     else
         return "";
     int indexSlash = strUrl.find( " / ");
     if(indexSlash != - 1)
    {
         return strUrl.substr( 0, indexSlash);
    }
     else
         return strUrl;
     return "";
}

string GetRequestStr( string strUrl)
{
     int indexHttp = strUrl.find( " http:// ");
     if(indexHttp != - 1)
    {
        strUrl = strUrl.substr( 7);
    }
     else
         return "";
     int indexSlash = strUrl.find( " / ");
     if(indexSlash == - 1)
    {
         return "";
    }
     else
         return strUrl.substr(indexSlash);
}

string GetHtml( string strUrl)
{
     string strHost = GetHost(strUrl);
     string strRequestStr = GetRequestStr(strUrl);
    USES_CONVERSION;
    LPCWSTR host = A2CW(strHost.c_str());
    LPCWSTR requestStr = A2CW(strRequestStr.c_str());

     // Variables
    DWORD dwSize = 0;
    DWORD dwDownloaded = 0;
    LPSTR pszOutBuffer;
    vector < string>  vFileContent;
    BOOL  bResults = FALSE;
    HINTERNET  hSession = NULL,
        hConnect = NULL,
        hRequest = NULL;

     // 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, 0);

     // Specify an HTTP server.
     if (hSession)
        hConnect = WinHttpConnect(hSession, host,
        INTERNET_DEFAULT_HTTP_PORT, 0);

     // 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,
         0, WINHTTP_NO_REQUEST_DATA, 0,
         0, 0);

     // End the request.
     if (bResults)
        bResults = WinHttpReceiveResponse(hRequest, NULL);

     // Keep checking for data until there is nothing left.
     if (bResults)
         do
        {

             // Check for available data.
            dwSize = 0;
             if (!WinHttpQueryDataAvailable( hRequest, &dwSize))
                printf( " Error %u in WinHttpQueryDataAvailable.\n ",
                GetLastError());

             // Allocate space for the buffer.
            pszOutBuffer = new char[dwSize+ 1];
             if (!pszOutBuffer)
            {
                printf( " Out of memory\n ");
                dwSize= 0;
            }
             else
            {
                 // Read the Data.
                ZeroMemory(pszOutBuffer, dwSize+ 1);

                 if (!WinHttpReadData( hRequest, (LPVOID)pszOutBuffer,
                    dwSize, &dwDownloaded))
                {
                    printf( " Error %u in WinHttpReadData.\n ",
                        GetLastError());
                }
                 else
                {
                    printf( " %s ", pszOutBuffer);
                     // Data in vFileContent
                    vFileContent.push_back(pszOutBuffer);
                }

                 // Free the memory allocated to the buffer.
                delete [] pszOutBuffer;
            }

        } while (dwSize> 0);

         // Report any errors.
         if (!bResults)
            printf( " Error %d has occurred.\n ",GetLastError());

         // Close any open handles.
         if (hRequest) WinHttpCloseHandle(hRequest);
         if (hConnect) WinHttpCloseHandle(hConnect);
         if (hSession) WinHttpCloseHandle(hSession);
         string strHtml = "";
         for ( int i = 0; i < ( int) vFileContent.size();i++)
        {
            strHtml += vFileContent[i];
        }
         // Write vFileContent to file
         // 寫入文件
         // ofstream out("test.txt",ios::binary);

         // for (int i = 0; i < (int) vFileContent.size();i++)
         // {
         //     string str = vFileContent[i];
         //     out << str;
         //      // cout << str << endl;
         // }
         // out.close();
         // int iTest;
         // cin >> iTest;
         return strHtml;
}

int _tmain( int argc, _TCHAR* argv[])
{
     string str = GetHtml( " http://bbs.bccn.net/thread-294526-1-1.html ");
    cout << str << endl;
    system( " pause ");
     return 0;
}

源碼下載

免責聲明！

本站轉載的文章為個人學習借鑒使用，本站對版權不負任何法律責任。如果侵犯了您的隱私權益，請聯系本站郵箱yoyou2525@163.com刪除。

猜您在找 c++ 使用WinHTTP實現文件下載功能 C++編程筆記：使用WinHTTP實現HTTP訪問使用 WinHttp 實現文件下載 Dev C++的下載和使用 VS2008 C++ 利用WinHttp API獲取任意Http網址的源碼 VS2008 C++ 利用WinHttp API獲取Http請求/響應頭部Header 【C++】純C++實現http打開網頁下載內容的功能 POST教程筆記 - WinHttp獲取網頁源碼 C++ JsonCpp 使用(含源碼下載) 使用WinINet和WinHTTP實現Http訪問