禁用启用网卡
http://www.donews.net/zwell/archive/2004/07/30/54476.aspx

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/*****************************************************************************
演示如何编程实现启用禁用网卡
Mady By ZwelL
2004.7.29
zwell@sohu.com
*****************************************************************************/
#include 
#include 
#include 
#include 
#pragma comment(lib,"ws2_32.lib")
#pragma comment(lib,"setupapi.lib")

BOOL DisableNetInterface(bool bStatus)
{
    IN LPTSTR HardwareId ;
    //硬件ComponentId，注册表地址：system\currentcontrolset\class\{4D36E972-E325-11CE-BFC1-08002BE10318}\0000
    
    HardwareId="PCI\\VEN_10EC&DEV_8139&SUBSYS_813910EC" ;
    
    DWORD NewState ;
    
    if(bStatus)
    {
        NewState=DICS_DISABLE ;
        //禁用
    }
    else 
    {
        NewState=DICS_ENABLE ;
        //启用
    }
    
    //调用ddk函数，来禁用网卡
    
    DWORD i,err ;
    BOOL Found=false ;
    
    HDEVINFO hDevInfo ;
    SP_DEVINFO_DATA spDevInfoData ;
    
    //访问系统的硬件库
    hDevInfo=SetupDiGetClassDevs(NULL,"PCI",NULL,DIGCF_ALLCLASSES|DIGCF_PRESENT);
    if(hDevInfo==INVALID_HANDLE_VALUE)
    {
        printf("访问系统硬件出错！");
        return false ;
    }
    
    //枚举硬件，获得需要的接口
    spDevInfoData.cbSize=sizeof(SP_DEVINFO_DATA);
    for(i=0;SetupDiEnumDeviceInfo(hDevInfo,i,&spDevInfoData);i++)
    {
        DWORD DataT ;
        LPTSTR p,buffer=NULL ;
        DWORD buffersize=0 ;
        
        //获得硬件的属性值
        while(!SetupDiGetDeviceRegistryProperty(
    hDevInfo,
    &spDevInfoData,
    SPDRP_HARDWAREID,
    &DataT,
    (PBYTE)buffer,
    buffersize,
    &buffersize))
        {
            if(GetLastError()==ERROR_INVALID_DATA)
            {
                //不存在HardwareID. Continue.
                break ;
            }
            else if(GetLastError()==ERROR_INSUFFICIENT_BUFFER)
            {
                //buffer size不对.
                if(buffer)
                LocalFree(buffer);
                buffer=(char*)LocalAlloc(LPTR,buffersize);
            }
            else 
            {
                //未知错误
                goto cleanup_DeviceInfo ;
            }
        }
        
        if(GetLastError()==ERROR_INVALID_DATA)
        continue ;
        
        //比较，找到和网卡ID相同的项
        for(p=buffer;*p&&(p<&buffer[buffersize]);p+=lstrlen(p)+sizeof(TCHAR))
        {
            
            if(!_tcscmp(HardwareId,p))
            {
                //找到网卡
                Found=TRUE ;
                break ;
            }
        }
        
        if(buffer)
        LocalFree(buffer);
        
        //如果相等
        if(Found)
        {
            //禁用该设备
            
            SP_PROPCHANGE_PARAMS spPropChangeParams ;
            
            spPropChangeParams.ClassInstallHeader.cbSize=sizeof(SP_CLASSINSTALL_HEADER);
            spPropChangeParams.ClassInstallHeader.InstallFunction=DIF_PROPERTYCHANGE ;
            spPropChangeParams.Scope=DICS_FLAG_GLOBAL ;
            spPropChangeParams.StateChange=NewState ;
            //禁用：DICS_DISABLE，DICS_ENABLE启用
            
            //
            if(!SetupDiSetClassInstallParams(hDevInfo,&spDevInfoData,(SP_CLASSINSTALL_HEADER*)&spPropChangeParams,sizeof(spPropChangeParams)))
            {
                DWORD errorcode=GetLastError();
            }
            
            if(!SetupDiCallClassInstaller(DIF_PROPERTYCHANGE,hDevInfo,&spDevInfoData))
            {
                DWORD errorcode=GetLastError();
            }
            
            switch(NewState)
            {
                case DICS_DISABLE :
     printf("成功禁用网络！");
                break ;
                case DICS_ENABLE :
     printf("成功启用网络！");
                break ;
            }
            
            break ;
        }
        
    }
    
    //退出时，清理工作环境
    cleanup_DeviceInfo :
    err=GetLastError();
    SetupDiDestroyDeviceInfoList(hDevInfo);
    SetLastError(err);
    
    return true ;
}

void usage(char *exefile)
{
 printf("Usage:%s [-e|-d]\r\n", exefile);
 printf("\t-e: Enable the network card.\r\n");
 printf("\t-d: Disable the network card.\r\n");
 exit(0);
}


int main(int argc,char**argv)
{
 if(argc<2)
  usage(argv[0]);
 if(!DisableNetInterface((strstr(argv[1],"-d")>0?TRUE:FALSE)))
  printf("对网卡操作失败!");
    return 0;
}

拷过来做个资料收藏，kingza别介意~

windowsXP 注册表中没有system\currentcontrolset\class\{4D36E972-E325-11CE-BFC1-08002BE10318}\0000 该项。