编程设置IE代理的几种方式

编程设置IE代理有几种方式，看到最多的一种方式就是修改IE代理相关的注册表项，CodeProject上有使用这种方法完整的例子：“Change Internet Explorer 7 Proxy Setting without Restarting Internet Explorer”和“Change Internet Proxy settings”，一个是C#的，一个是vc++的程序。

第二种方法是使用WMI管理VBS脚本，WMI的Win32_Proxy类的方法SetProxySetting可以设置代理服务器名称和端口：

Set objWMIService = GetObject("winmgmts:\\.\root\CIMV2")   
Set objproxy = objWMIService.Get("Win32_Proxy.ServerName='localhost'")    
objproxy.SetProxySetting "127.0.0.1","8087"

使用WMI脚本可以设置代理，但是无法禁止或者启用代理。

第三种方法就是直接使用WINAPI，在Wininet.dll中提供了函数InternetQueryOption()查询IE的配置，函数InternetSetOption()来更改IE的配置，下面是一段切换IE代理的C＋＋程序，参照http://support.microsoft.com/kb/226473/en-us：

#include <stdio.h>
#include <tchar.h>
#include <Windows.h>
#include <Wininet.h>
#include<iostream> 


BOOL QueryProxy()
{
    BOOL ret=FALSE;

    INTERNET_PER_CONN_OPTION_LIST    List;
    INTERNET_PER_CONN_OPTION         Option[5];
    unsigned long                    nSize = sizeof(INTERNET_PER_CONN_OPTION_LIST);

    Option[0].dwOption = INTERNET_PER_CONN_AUTOCONFIG_URL;
    Option[1].dwOption = INTERNET_PER_CONN_AUTODISCOVERY_FLAGS;
    Option[2].dwOption = INTERNET_PER_CONN_FLAGS;
    Option[3].dwOption = INTERNET_PER_CONN_PROXY_BYPASS;
    Option[4].dwOption = INTERNET_PER_CONN_PROXY_SERVER;

    List.dwSize = sizeof(INTERNET_PER_CONN_OPTION_LIST);
    List.pszConnection = NULL;
    List.dwOptionCount = 5;
    List.dwOptionError = 0;
    List.pOptions = Option;

    if(!InternetQueryOption(NULL, INTERNET_OPTION_PER_CONNECTION_OPTION, &List, &nSize))
        _tprintf(_T("InternetQueryOption failed! (%d)\n"), GetLastError());
    if(Option[0].Value.pszValue != NULL)
        _tprintf(_T("%s\n"), Option[0].Value.pszValue);

    if((Option[2].Value.dwValue & PROXY_TYPE_AUTO_PROXY_URL) == PROXY_TYPE_AUTO_PROXY_URL)
        _tprintf(_T("PROXY_TYPE_AUTO_PROXY_URL\n"));

    if((Option[2].Value.dwValue & PROXY_TYPE_AUTO_DETECT) == PROXY_TYPE_AUTO_DETECT)
        _tprintf(_T("PROXY_TYPE_AUTO_DETECT\n"));
    if((Option[2].Value.dwValue &  PROXY_TYPE_PROXY) == PROXY_TYPE_PROXY)
        {
            _tprintf(_T("Proxy ENABLED!\n"));
            ret=TRUE;
        }
    else _tprintf(_T("Proxy DISABLED!\n"));
     
    _tprintf(_T("Current proxy:%s\n"),Option[4].Value.pszValue);

    INTERNET_VERSION_INFO      Version;
    nSize = sizeof(INTERNET_VERSION_INFO);

    InternetQueryOption(NULL, INTERNET_OPTION_VERSION, &Version, &nSize);

    if(Option[0].Value.pszValue != NULL)
        GlobalFree(Option[0].Value.pszValue);

    if(Option[3].Value.pszValue != NULL)
        GlobalFree(Option[3].Value.pszValue);

    if(Option[4].Value.pszValue != NULL)
        GlobalFree(Option[4].Value.pszValue);

    return ret;
}

void SetProxy(BOOL enableproxy)
{
        TCHAR buff[256] = _T("127.0.0.1:8087"); 
    // To include server for FTP, HTTPS, and so on, use the string
    // (ftp=http://<ProxyServerName>:80; https=https://<ProxyServerName>:80) 
    INTERNET_PER_CONN_OPTION_LIST    List; 
    INTERNET_PER_CONN_OPTION         Option[3]; 
    unsigned long                    nSize = sizeof(INTERNET_PER_CONN_OPTION_LIST); 


    Option[0].dwOption = INTERNET_PER_CONN_PROXY_SERVER; 
    Option[0].Value.pszValue = buff; 

    Option[1].dwOption = INTERNET_PER_CONN_FLAGS; 
    Option[1].Value.dwValue = PROXY_TYPE_DIRECT ; 
    if(enableproxy) Option[1].Value.dwValue |= PROXY_TYPE_PROXY; 
    // This option sets all the possible connection types for the client. 
    // This case specifies that the proxy can be used or direct connection is possible.

    Option[2].dwOption = INTERNET_PER_CONN_PROXY_BYPASS; 
    Option[2].Value.pszValue = _T("<local>"); 



    List.dwSize = sizeof(INTERNET_PER_CONN_OPTION_LIST); 
    List.pszConnection = NULL; 
    List.dwOptionCount = 3; 
    List.dwOptionError = 0; 
    List.pOptions = Option; 

    if(!InternetSetOption(NULL, INTERNET_OPTION_PER_CONNECTION_OPTION, &List, nSize)) 
        _tprintf(_T("InternetSetOption failed! (%d)\n"), GetLastError()); 

    InternetSetOption(NULL, INTERNET_OPTION_REFRESH, NULL,NULL); 
    //The connection settings for other instances of Internet Explorer. 

    _tprintf(_T("Proxy was %s!\n"),enableproxy?_T("ENABLED"):_T("DISABLED"));
}


int _tmain(int argc, _TCHAR* argv[])
{


    SetProxy(!QueryProxy());

    std::cin.get();

    return 0;
}