1. //只需初始化一次，初始化多次时会报错 
  2. bool InitWmi（void） 
  3. { 
  4.     HRESULT hres; 
  5.     hres =  CoInitializeEx(0, COINIT_MULTITHREADED);   
  6.     if (FAILED(hres))  
  7.     {  
  8.         cout << "Failed to initialize COM library. Error code = 0x"<< hex << hres << endl;  
  9.         return FALSE;                  
  10.     } 
  11.     hres =  CoInitializeSecurity(  
  12.         NULL,   
  13.         -1,                          // COM authentication  
  14.         NULL,                        // Authentication services  
  15.         NULL,                        // Reserved  
  16.         RPC_C_AUTHN_LEVEL_DEFAULT,   // Default authentication   
  17.         RPC_C_IMP_LEVEL_IMPERSONATE, // Default Impersonation    
  18.         NULL,                        // Authentication info  
  19.         EOAC_NONE,                   // Additional capabilities   
  20.         NULL                         // Reserved  
  21.         );  
  22.  
  23.     if (FAILED(hres))  
  24.     {  
  25.         cout << "Failed to initialize security. Error code = 0x"<< hex << hres << endl;  
  26.         CoUninitialize();  
  27.         return FALSE;                   
  28.     } 
  29.    return TRUE; 
  30. } 
  31.  
  32. BOOL mywmi::GetInfoWithWmi(BSTR sUsedWmiNamespacePath, // Object path of WMI namespace such as "ROOT\\CIMV2" 	BSTR sQueryStatement, //input you query statement,such as "SELECT * FROM Win32_Process" 	vector<WCHAR *>cQueryValue, //把要查询的值存放到vector中,such as Name ProcessID.. 	vector<vector<string> > &vRt //2维数组，保存所有查询到的项的值 	) { 	try 	{ 		HRESULT hres;   		//创建一个CLSID_WebmLocator对象.   		IWbemLocator *pLoc = NULL;   		hres = CoCreateInstance( CLSID_WbemLocator, 0, CLSCTX_INPROC_SERVER,IID_IWbemLocator, (LPVOID *) &pLoc);   		if (FAILED(hres))   		{    			throw "Failed to create IWbemLocator object."; 		}    		//连接WMI   		IWbemServices *pSvc = NULL;    		hres = pLoc->ConnectServer(   			sUsedWmiNamespacePath, // Object path of WMI namespace   			NULL,                    // User name. NULL = current user   			NULL,                    // User password. NULL = current   			0,                       // Locale. NULL indicates current   			NULL,                    // Security flags.   			0,                       // Authority (e.g. Kerberos)   			0,                       // Context object    			&pSvc                    // pointer to IWbemServices proxy   			);    		if (FAILED(hres))   		{   			pLoc->Release();        			throw "Could not connect."; 		}    		// Step 5: --------------------------------------------------   		// Set security levels on the proxy -------------------------   		// 设置连接的安全级别   		hres = CoSetProxyBlanket(   			pSvc,                        // Indicates the proxy to set   			RPC_C_AUTHN_WINNT,           // RPC_C_AUTHN_xxx   			RPC_C_AUTHZ_NONE,            // RPC_C_AUTHZ_xxx   			NULL,                        // Server principal name    			RPC_C_AUTHN_LEVEL_CALL,      // RPC_C_AUTHN_LEVEL_xxx    			RPC_C_IMP_LEVEL_IMPERSONATE, // RPC_C_IMP_LEVEL_xxx   			NULL,                        // client identity   			EOAC_NONE                    // proxy capabilities    			);    		if (FAILED(hres))   		{   			pSvc->Release();   			pLoc->Release();        			throw "Could not set proxy blanket.";              		}   		//开始查询 		IEnumWbemClassObject* pEnumerator = NULL;   		hres = pSvc->ExecQuery(   			bstr_t("WQL"),    			sQueryStatement,   			WBEM_FLAG_FORWARD_ONLY | WBEM_FLAG_RETURN_IMMEDIATELY,    			NULL,   			&pEnumerator);    		if (FAILED(hres))   		{   			pSvc->Release();   			pLoc->Release();   			throw "Query for operating system name failed."; 		}    		// Step 7: -------------------------------------------------   		// Get the data from the query in step 6 -------------------   		//枚举查询   		IWbemClassObject *pclsObj;   		ULONG uReturn = 0;   		string cTmp; 		while (pEnumerator)   		{   			vector<std::string>sTmpVec;  			HRESULT hr = pEnumerator->Next(WBEM_INFINITE, 1, &pclsObj, &uReturn);    			if(0 == uReturn)   			{   				break;   			}    			VARIANT vtProp;    			for (UINT i = 0; i<cQueryValue.size();i++) 			{ 				hr = pclsObj->Get(cQueryValue[i], 0, &vtProp, 0, 0);  				switch(vtProp.vt) 				{ 				case 0: 				case 1: 					sTmpVec.push_back(""); 					break; 				case 3: 					{ 						char buf[10]={0}; 						sprintf_s(buf,"%d",vtProp.intVal); 						sTmpVec.push_back(buf); 					}  					break; 				case 8: 					{ 						char *buf = _com_util::ConvertBSTRToString(vtProp.bstrVal); 						sTmpVec.push_back(buf); 						delete buf; 					}  					break; 				default: 					sTmpVec.push_back(""); 					break; 				}  				VariantClear(&vtProp);   			}			 			vRt.push_back(sTmpVec);  			pclsObj->Release();   		}    		pSvc->Release();   		pLoc->Release();   		pEnumerator->Release();   	} 	catch (char * str) 	{ 		CoUninitialize();  		cout<<str<<endl; 		return FALSE; 	}  	return TRUE; }