C++ + WMI + DDK 实现获得显卡信息 代码

//Build   it   in   VC++   2005   with   the   following   command 
//   cl   /Zc:wchar_t-   videocontroller.cpp 
//   by   Onega(www.fruitfruit.com) 
#define   _WIN32_DCOM 
#include   <Wbemidl.h> 
#pragma   comment(lib, "Wbemuuid.lib ") 
#include   <atlbase.h> 
#include   "objbase.h " 
#include   <windows.h> 
#include   <comutil.h> 
#pragma   comment(lib,   "comsupp.lib ") 
#include   <iostream> 

void   print_property(CComBSTR   bstrPropName,   _variant_t&   varProperty) 
...{ 
    std::cout < < "     " < <(LPCTSTR)_bstr_t(bstrPropName); 
    std::cout < < "   =   "; 

    if(varProperty.vt   !=VT_EMPTY   &&   VT_NULL   !=   varProperty.vt) 
    ...{ 
        _variant_t   vDest; 
        HRESULT   hr   =   VariantChangeType(&vDest,   &varProperty,0,VT_BSTR); 
        if(SUCCEEDED(hr)) 
            std::cout < <   (LPCTSTR)_bstr_t(varProperty); 
        else 
        ...{ 
            if(varProperty.vt   ==   (VT_ARRAY   |   VT_I4)   ) 
            ...{ 
                SAFEARRAY*   psa   =   varProperty.parray; 
                int   *pIntArray   =   NULL; 
                SafeArrayAccessData(psa,(VOID**)&pIntArray); 
                UINT   uDim   =   SafeArrayGetDim(psa); 
                if(1==uDim) 
                ...{ 
                    long   lLbound,lRbound; 
                    SafeArrayGetLBound(psa,1,&lLbound); 
                    SafeArrayGetUBound(psa,1,&lRbound); 
                    for(long   i=lLbound;i <=lRbound;i++) 
                    ...{ 
                        std::cout < <   pIntArray[i] < < "   "; 
                    } 
                } 
                SafeArrayUnaccessData(psa); 
            } 
            else 
            ...{ 
                std::cout < <   varProperty.vt   < <   "   type   "; 
            } 
        } 
    } 
    else 
    ...{ 
        if(varProperty.vt   ==   VT_EMPTY) 
            std::cout < <   "VT_EMPTY   "; 
        else 
            std::cout < <   "VT_NULL "; 
    } 
    std::cout < <std::endl; 
} 

int   main() 
...{ 
    CoInitialize(NULL); 
    ...{ 
        HRESULT   hr   =   S_OK; 
        CComPtr <IWbemLocator>   spLoc; 
        hr   =   spLoc.CoCreateInstance(CLSID_WbemLocator); 
        CComBSTR   bstrNamespace( "//./root/CIMV2 "); 
        CComPtr <IWbemServices>   spServices; 
        hr   =   spLoc-> ConnectServer(bstrNamespace,   NULL,   NULL,   0, 
            NULL,   0,   0,   &spServices); 
        hr   =   CoSetProxyBlanket(spServices,   RPC_C_AUTHN_DEFAULT, 
            RPC_C_AUTHZ_NONE,   NULL,   RPC_C_AUTHN_LEVEL_CALL, 
            RPC_C_IMP_LEVEL_IMPERSONATE,   NULL,   EOAC_NONE); 
        ...{ 
            CComPtr <IEnumWbemClassObject>   spEnumInst; 
            hr   =   spServices-> CreateInstanceEnum(CComBSTR( "Win32_VideoController "), 
                WBEM_FLAG_SHALLOW,   NULL,   &spEnumInst); 
            bool   bFinished   =   false; 
            while   (!bFinished) 
            ...{ 
                ULONG   uNumOfInstances   =   0; 
                CComPtr <IWbemClassObject>   spInstance; 
                HRESULT   hrNext   =   spEnumInst-> Next(10000,   1,   &spInstance, 
                    &uNumOfInstances); 
                if   (hrNext   ==   WBEM_S_FALSE) 
                    bFinished   =   true; 
                else   if   (hrNext   ==   WBEM_S_NO_ERROR) 
                ...{ 
                    //PrintObject(spInstance); 
                    _variant_t   varProperty; 
                    CComBSTR   bstrPropName; 
                    bstrPropName   =   CComBSTR( "PNPDeviceID "); 
                    hr   =   spInstance-> Get(bstrPropName,0,&varProperty,NULL,0); 
                    print_property(bstrPropName,varProperty); 
                    bstrPropName   =   CComBSTR( "AdapterRAM "); 
                    hr   =   spInstance-> Get(bstrPropName,0,&varProperty,NULL,0); 
                    print_property(bstrPropName,varProperty); 
                    bstrPropName   =   CComBSTR( "Description "); 
                    hr   =   spInstance-> Get(bstrPropName,0,&varProperty,NULL,0); 
                    print_property(bstrPropName,varProperty); 

                } 
            } 
        } 
    } 
    std::cout < <   "finished   " < <std::endl; 
    CoUninitialize(); 
    system( "pause "); 
    return   0; 
}