禁用和启用网卡.使用windows DDK - David liao Stl C - ...

#include <SetupAPI.h>   
#include <cfgmgr32.h>     
#include <list>
using namespace std;
//     cfgmgr32.h 在Microsoft Windows 2000 DDK 中.   
//     要用 CM_Get_DevNode_Status(...) 来查询状态.   
//---------------------------------------------------------------------------   
typedef struct  NetCardStruct   
...{   
    DWORD    Id;         // 网卡设备号   
    AnsiString   Name;     // 网卡名   
    bool     Disabled;     // 当前是否禁用   
    bool     Changed;         // 是否更改过   
}TNetCardStruct;   
typedef TNetCardStruct*  PNetCardStruct;   
typedef list<TNetCardStruct> TList;

//---------------------------------------------------------------------------   
//     EnumNetCards 枚举出网卡   
//---------------------------------------------------------------------------   
void  __fastcall EnumNetCards(TList  *NetDeviceList)   
...{   
    AnsiString     DevValue;   
    PNetCardStruct NetCard;   
    DWORD  Status, Problem;   
    LPTSTR Buffer   = NULL;   
    DWORD  BufSize  = 0;   
    HDEVINFO hDevInfo   = 0;  

    if(INVALID_HANDLE_VALUE==(hDevInfo=SetupDiGetClassDevs(NULL,NULL,0,DIGCF_PRESENT &brvbar;DIGCF_ALLCLASSES)))   
        return; 

    SP_DEVINFO_DATA  DeviceInfoData =...{sizeof(SP_DEVINFO_DATA)};

    HKEY hKeyClass;   
    char DeviceName[200];   
    for(DWORD DeviceId=0;SetupDiEnumDeviceInfo(hDevInfo,DeviceId,&DeviceInfoData);DeviceId++)   
    ...{   
        if (CM_Get_DevNode_Status(&Status, &Problem, DeviceInfoData.DevInst,0) != CR_SUCCESS)   
            continue;   
        DevValue.SetLength(0);   
        if(GetRegistryProperty(hDevInfo, &DeviceInfoData, SPDRP_CLASS , &Buffer, (PULONG)&BufSize))   
            DevValue = Buffer;   

        if (DevValue == "Net")   
        ...{   
            DevValue.SetLength(0);   

            if (GetRegistryProperty(hDevInfo, &DeviceInfoData, SPDRP_ENUMERATOR_NAME , &Buffer, (PULONG)&BufSize))   
                DevValue = Buffer;   

            if (DevValue != "ROOT")   
            ...{   
                NetCard = new TNetCardStruct;   
                NetCard->Id = DeviceId;   
                NetCard->Name = "<Unknown Device>";   
                if (GetRegistryProperty(hDevInfo, &DeviceInfoData, SPDRP_DRIVER , &Buffer, (PULONG)&BufSize))   
                    if (GetRegistryProperty(hDevInfo, &DeviceInfoData, SPDRP_DEVICEDESC , &Buffer, (PULONG)&BufSize))   
                        NetCard->Name = Buffer;   
                NetCard->Disabled = (Status & DN_HAS_PROBLEM) && (CM_PROB_DISABLED == Problem);   
                NetCard->Changed = false;   
                NetDeviceList->Add(NetCard);   
            }   
        }   
    }   
}   

//---------------------------------------------------------------------------   
bool __fastcall GetRegistryProperty(HDEVINFO DeviceInfoSet,   
                                    PSP_DEVINFO_DATA DeviceInfoData, 
                                    ULONG Property, 
                                    PVOID Buffer,
                                    PULONG Length)   
...{   
    while (!SetupDiGetDeviceRegistryProperty(DeviceInfoSet,   
        DeviceInfoData, Property, NULL, (BYTE *)*(TCHAR **)Buffer, *Length, Length))   
    ...{   
        if (GetLastError() == ERROR_INSUFFICIENT_BUFFER)   
        ...{   
            if (*(LPTSTR *)Buffer) LocalFree(*(LPTSTR *)Buffer);   
            *(LPTSTR *)Buffer = (PCHAR)LocalAlloc(LPTR,*Length);   
        }   
        else return false;   
    }   
    return (*(LPTSTR *)Buffer)[0];   
}   


//---------------------------------------------------------------------------   
//     NetCardStateChange 网卡的启用与禁用   
//             NetCardPoint 是 PNetCardStruct 的指针.   
//             Enabled     true = 启用     false = 禁用   
//---------------------------------------------------------------------------   
bool __fastcall NetCardStateChange(void * NetCardPoint, bool Enabled)   
...{   
    PNetCardStruct NetCard = (PNetCardStruct)NetCardPoint;   
    DWORD DeviceId = NetCard->Id;   
    HDEVINFO hDevInfo = 0;   
    if (INVALID_HANDLE_VALUE == (hDevInfo =   
        SetupDiGetClassDevs(NULL,NULL,0,DIGCF_PRESENT &brvbar;DIGCF_ALLCLASSES)))   
        return false;   
    SP_DEVINFO_DATA DeviceInfoData = ;   
    DWORD Status, Problem;   
    if (!SetupDiEnumDeviceInfo(hDevInfo,DeviceId,&DeviceInfoData))   
        return false;   

    if (CM_Get_DevNode_Status(&Status, &Problem,   
        DeviceInfoData.DevInst,0) != CR_SUCCESS)   
        return false;   

    SP_PROPCHANGE_PARAMS PropChangeParams = ;   
    PropChangeParams.ClassInstallHeader.InstallFunction = DIF_PROPERTYCHANGE;   
    PropChangeParams.Scope = DICS_FLAG_GLOBAL;   
    if (Enabled)   
    ...{   
        if (!((Status & DN_HAS_PROBLEM) && (CM_PROB_DISABLED == Problem)))   
        ...{   
            NetCard->Disabled = false;   
            return false;   
        }   
        PropChangeParams.StateChange = DICS_ENABLE;   
    }   
    else   
    ...{   
        if ((Status & DN_HAS_PROBLEM) && (CM_PROB_DISABLED == Problem))   
        ...{   
            NetCard->Disabled = true;   
            return false;   
        }   
        if (!((Status & DN_DISABLEABLE) && (CM_PROB_HARDWARE_DISABLED != Problem)))   
            return false;   
        PropChangeParams.StateChange = DICS_DISABLE;   
    }   

    if (!SetupDiSetClassInstallParams(hDevInfo, &DeviceInfoData,   
        (SP_CLASSINSTALL_HEADER *)&PropChangeParams, sizeof(PropChangeParams)))   
        return false;   
    if (!SetupDiCallClassInstaller(DIF_PROPERTYCHANGE, hDevInfo, &DeviceInfoData))   
        return false;   
    if (CM_Get_DevNode_Status(&Status, &Problem,   
        DeviceInfoData.DevInst,0) == CR_SUCCESS)   
        NetCard->Disabled = (Status & DN_HAS_PROBLEM) && (CM_PROB_DISABLED == Problem);   
    return true;