Question

我正在使用dev c ++，Wininet lib从web下载文件。我正在尝试更改引用者或用户代理。我使用这段代码，它下载成功，但我不知道如何更改http标头。感谢。

#include <Windows.h>
#include <Wininet.h>
#include <iostream>
#include <fstream>

namespace {

    ::HINTERNET netstart ()
    {
        const ::HINTERNET handle =
            ::InternetOpenW(0, INTERNET_OPEN_TYPE_DIRECT, 0, 0, 0);
        if ( handle == 0 )
        {
            const ::DWORD error = ::GetLastError();
            std::cerr
                << "InternetOpen(): " << error << "."
                << std::endl;
        }
        return (handle);
    }

    void netclose ( ::HINTERNET object )
    {
        const ::BOOL result = ::InternetCloseHandle(object);
        if ( result == FALSE )
        {
            const ::DWORD error = ::GetLastError();
            std::cerr
                << "InternetClose(): " << error << "."
                << std::endl;
        }
    }

    ::HINTERNET netopen ( ::HINTERNET session, ::LPCWSTR url )
    {
        const ::HINTERNET handle =
            ::InternetOpenUrlW(session, url, 0, 0, 0, 0);
        if ( handle == 0 )
        {
            const ::DWORD error = ::GetLastError();
            std::cerr
                << "InternetOpenUrl(): " << error << "."
                << std::endl;
        }
        return (handle);
    }

    void netfetch ( ::HINTERNET istream, std::ostream& ostream )
    {
        static const ::DWORD SIZE = 1024;
        ::DWORD error = ERROR_SUCCESS;
        ::BYTE data[SIZE];
        ::DWORD size = 0;
        do {
            ::BOOL result = ::InternetReadFile(istream, data, SIZE, &size);
            if ( result == FALSE )
            {
                error = ::GetLastError();
                std::cerr
                    << "InternetReadFile(): " << error << "."
                    << std::endl;
            }
            ostream.write((const char*)data, size);
        }
        while ((error == ERROR_SUCCESS) && (size > 0));
    }

}

int main ( int, char ** )
{
    const ::WCHAR URL[] = L"http://google.com";
    const ::HINTERNET session = ::netstart();
    if ( session != 0 )
    {
        const ::HINTERNET istream = ::netopen(session, URL);
        if ( istream != 0 )
        {
            std::ofstream ostream("googleindex.html", std::ios::binary);
            if ( ostream.is_open() ) {
                ::netfetch(istream, ostream);
            }
            else {
                std::cerr << "Could not open 'googleindex.html'." << std::endl;
            }
            ::netclose(istream);
        }
        ::netclose(session);
    }
}

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

Answer 1

将用户代理字符串作为第一个参数传递给InternetOpen

使用HttpOpenRequest和HttpSendRequest代替InternetOpenUrl。 Referer string是HttpOpenRequest

的第五个参数

Answer 2

InternetOpenUrl的第三个参数是 lpszHeaders [in] （来自MSDN）：

指向以null结尾的字符串的指针，该字符串指定要发送到HTTP服务器的标头。有关更多信息，请参阅HttpSendRequest函数中lpszHeaders参数的说明。

您可以像这样设置Referer和User agent：

LPWSTR headers = L"User-Agent: myagent\r\nReferer: my.referer.com\r\n\r\n\r\n";
//and then call
::InternetOpenUrlW(session, url, headers, -1, 0, 0);

您必须将每个标题与\ r \ n分开并使用\ r \ n \ r \ n

关闭该块

C ++ Wininet自定义http标头

2 个答案: