使用WMI获取硬盘信息

    WMI可以进行的操作很多，想Windows优化大师就有很多操作是通过WMI进行的。在这篇文章中主要是给出一个使用WMI来获取数据的一个范例，如果要获取其他数据，可以先使用WMI studio tools查询，然后copy代码就可以了。我要贴上去代码也是msdn中的范例了。

int GetStorageInfo(CString szClass,REQHARDWAREINFO& HardInfo){HRESULT hres ;HTREEITEMhItem;CString szWQL = _T("SELECT FileSystem,FreeSpace,Name,Size,DriveType from ") + szClass;// Initialize COM.hres=CoInitializeEx(0,COINIT_MULTITHREADED);if(FAILED(hres)){cout<<"Failed to initialize COM library. Error code = 0x" <<hex<<hres<<endl ;return 1 ;// Program has failed.}// Initializehres=CoInitializeSecurity(NULL,-1,NULL,NULL,RPC_C_AUTHN_LEVEL_DEFAULT,RPC_C_IMP_LEVEL_IMPERSONATE,NULL,EOAC_NONE,NULL);if(FAILED(hres)){cout<<"Failed to initialize security. Error code = 0x" <<hex<<hres<<endl ;CoUninitialize();return 1 ;// Program has failed.}// Obtain the initial locator to Windows Management on a particular host computer.IWbemLocator*pLoc=0 ;hres=CoCreateInstance(CLSID_WbemLocator,0,CLSCTX_INPROC_SERVER,IID_IWbemLocator,(LPVOID*)&pLoc);if(FAILED(hres)){cout<<"Failed to create IWbemLocator object. Err code = 0x" <<hex<<hres<<endl ;CoUninitialize();return 1 ;// Program has failed.}IWbemServices*pSvc=0 ;// Connect to the root/cimv2 namespace with the current user and obtain pointer pSvc// to make IWbemServices calls.hres=pLoc->ConnectServer(_bstr_t(L"ROOT//CIMV2"),NULL,NULL,0,NULL,0,0,&pSvc);if(FAILED(hres)){cout<<"Could not connect. Error code = 0x" <<hex<<hres<<endl ;pLoc->Release();CoUninitialize();return 1 ;// Program has failed.}cout<<"Connected to WMI"<<endl ;// Set the IWbemServices proxy so that impersonation of the user (client) occurs.hres=CoSetProxyBlanket(pSvc,RPC_C_AUTHN_WINNT,RPC_C_AUTHZ_NONE,NULL,RPC_C_AUTHN_LEVEL_CALL,RPC_C_IMP_LEVEL_IMPERSONATE,NULL,EOAC_NONE);if(FAILED(hres)){cout<<"Could not set proxy blanket. Error code = 0x" <<hex<<hres<<endl ;pSvc->Release();pLoc->Release();CoUninitialize();return 1 ;// Program has failed.}// Use the IWbemServices pointer to make requests of WMI.// Make requests here:// For example, query for print queues that have more than 10 jobsIEnumWbemClassObject*pEnumerator=NULL ;hres=pSvc->ExecQuery(bstr_t("WQL"),bstr_t((LPTSTR)(LPCTSTR)szWQL),WBEM_FLAG_FORWARD_ONLY|WBEM_FLAG_RETURN_IMMEDIATELY,NULL,&pEnumerator);if(FAILED(hres)){cout<<"Query for print queues failed. Error code = 0x" <<hex<<hres<<endl ;pSvc->Release();pLoc->Release();CoUninitialize();return 1 ;// Program has failed.}else {//clist.DeleteAllItems();IWbemClassObject*pInstance=NULL ;ULONG dwCount ;while(pEnumerator->Next(WBEM_INFINITE,1,&pInstance,&dwCount)==S_OK){SAFEARRAY*pvNames=NULL ;VARIANT vName,vFileSystem,vFreeSpace,vSize,vDriveType;pInstance->Get(L"DriveType",0,&vDriveType,NULL,NULL);CString szDriveType = VariantToString(vDriveType);//固定磁盘检查if (szDriveType.Compare("3")!=0){continue;}pInstance->Get(L"FileSystem",0,&vFileSystem,NULL,NULL);CString szFileSystem = VariantToString(vFileSystem);pInstance->Get(L"FreeSpace",0,&vFreeSpace,NULL,NULL);CString szFreeSpace = VariantToString(vFreeSpace);pInstance->Get(L"Size",0,&vSize,NULL,NULL);CString szSize = VariantToString(vSize);pInstance->Get(L"Name",0,&vName,NULL,NULL);CString szName = VariantToString(vName);if(pvNames)SafeArrayDestroy(pvNames);}if(pInstance)pInstance->Release();}// Cleanup// ========pEnumerator->Release();pSvc->Release();pLoc->Release();CoUninitialize();return 0;}