初识Wininet:抓网页-优快云博客

本文介绍了一个使用C++实现的简单网页抓取程序。该程序利用Wininet库进行HTTP请求，获取指定URL的内容，并将其保存到本地文件中。通过此示例，读者可以了解到如何使用C++和Windows API来完成基本的网络交互任务。

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#include "stdafx.h"
#include<windows.h>
#include<Wininet.h>
#include<iostream>
#include<fstream>
#include<string>

#pragma comment(lib,"WinInet.lib")

using namespace std;

int main()
{
    HINTERNET hINet, hHttpFile;
    char szSizeBuffer[32];

    DWORD dwLengthSizeBuffer = sizeof(szSizeBuffer);

    hINet = InternetOpen("IE6.0", INTERNET_OPEN_TYPE_PRECONFIG, NULL, NULL, 0 );

    string url = "http://www.sina.com";
    if ( !hINet )
    {
        cout << "InternetOpen fail" << endl;
        return 1;
    }

hHttpFile = InternetOpenUrl(hINet, url.c_str(), NULL, 0, 0, 0);

    if(!hHttpFile)
    {
        cout << "error open url" << endl;
        return 1;
    }

    BOOL bQuery = HttpQueryInfo(hHttpFile,
                                HTTP_QUERY_CONTENT_LENGTH,
                                szSizeBuffer,
                                &dwLengthSizeBuffer, NULL);

    if(bQuery ==false)
    {
        InternetCloseHandle(hINet);
        cout << "error query info" << endl;
        return 3;
    }
    int FileSize=atol(szSizeBuffer);

string revData;

    revData.resize(FileSize);

    DWORD dwBytesRead;

BOOL bRead = InternetReadFile(hHttpFile, &revData[0], FileSize, &dwBytesRead);

    if(!bRead)
    {
        cout << "error to read file" << endl;
        return 4;
    }

ofstream out_file("wangye.txt");
out_file << revData;

    InternetCloseHandle(hHttpFile);
    InternetCloseHandle(hINet);

    cout << "capture success !/n" << endl;
    system("pause");
    return 0;

}