(C++)从本机获取WMI数据.
下面的步骤被用于执行WMI程序. 第1步到第5步包含了建立和连接WMI的所有步骤。第6,7步用于数据查询和获取。
1. 通过调用CoInitialzeEx来初始化COM参数.
2. 通过调用CoInitializeSecurity来初始化COM过程安全.
3. 通过调用CoCreateInstance来实例化。
4. 通过调用IWbemLocator::ConnectServer来获取一个本机root\cimv2命名空间的IWbemServices的指针。
5. 设置IWbemServices代理安全，WMI service可以通过调用CoSetProxyBlanket来模拟客户端。
6. 用IWbmeServices指针来查询WMI. 本例子通过调用IWbemServies::ExecQuery 来查询操作系统名称.
SELEC * FROM Win32_OperatingSystem
7. 获取和现实WQL查询的数据.
- VARIANT vtProp;
- // Get the value of the Name property
- hr = pclsObj->Get(L"Name", 0, &vtProp, 0, 0);
环境说明：VS2012 + WIN8 64位 Console Application
完整代码:
// GetWMIInfo.cpp : Defines the entry point for the console application. // #include "stdafx.h" #include <iostream> using namespace std; #include <comdef.h> #include <Wbemidl.h> # pragma comment(lib, "wbemuuid.lib") int _tmain(int argc, _TCHAR* argv[]) { HRESULT hres; // Step 1: -------------------------------------------------- // 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. } // Step 2: -------------------------------------------------- // Set general COM security levels -------------------------- // Note: If you are using Windows 2000, you need to specify - // the default authentication credentials for a user by using // a SOLE_AUTHENTICATION_LIST structure in the pAuthList ---- // parameter of CoInitializeSecurity ------------------------ hres = CoInitializeSecurity( NULL, -1, // COM authentication NULL, // Authentication services NULL, // Reserved RPC_C_AUTHN_LEVEL_DEFAULT, // Default authentication RPC_C_IMP_LEVEL_IMPERSONATE, // Default Impersonation NULL, // Authentication info EOAC_NONE, // Additional capabilities NULL // Reserved ); if (FAILED(hres)) { cout << "Failed to initialize security. Error code = 0x" << hex << hres << endl; CoUninitialize(); return 1; // Program has failed. } // Step 3: --------------------------------------------------- // Obtain the initial locator to WMI ------------------------- IWbemLocator *pLoc = NULL; 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. } // Step 4: ----------------------------------------------------- // Connect to WMI through the IWbemLocator::ConnectServer method IWbemServices *pSvc = NULL; // 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"), // 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)) { cout << "Could not connect. Error code = 0x" << hex << hres << endl; pLoc->Release(); CoUninitialize(); return 1; // Program has failed. } cout << "Connected to ROOT\\CIMV2 WMI namespace" << endl; // Step 5: -------------------------------------------------- // Set security levels on the proxy ------------------------- 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)) { cout << "Could not set proxy blanket. Error code = 0x" << hex << hres << endl; pSvc->Release(); pLoc->Release(); CoUninitialize(); return 1; // Program has failed. } // Step 6: -------------------------------------------------- // Use the IWbemServices pointer to make requests of WMI ---- // For example, get the name of the operating system IEnumWbemClassObject* pEnumerator = NULL; hres = pSvc->ExecQuery( bstr_t("WQL"), bstr_t("SELECT * FROM Win32_OperatingSystem"), WBEM_FLAG_FORWARD_ONLY | WBEM_FLAG_RETURN_IMMEDIATELY, NULL, &pEnumerator); if (FAILED(hres)) { cout << "Query for operating system name failed." << " Error code = 0x" << hex << hres << endl; pSvc->Release(); pLoc->Release(); CoUninitialize(); return 1; // Program has failed. } // Step 7: ------------------------------------------------- // Get the data from the query in step 6 ------------------- IWbemClassObject *pclsObj = NULL; ULONG uReturn = 0; while (pEnumerator) { HRESULT hr = pEnumerator->Next(WBEM_INFINITE, 1, &pclsObj, &uReturn); if(0 == uReturn) { break; } VARIANT vtProp; // Get the value of the Name property hr = pclsObj->Get(L"Name", 0, &vtProp, 0, 0); wcout << " OS Name : " << vtProp.bstrVal << endl; VariantClear(&vtProp); pclsObj->Release(); } // Cleanup // ======== if (pclsObj!=NULL){ pclsObj->Release(); } if (pEnumerator!=NULL){ pEnumerator->Release(); } pSvc->Release(); pLoc->Release(); CoUninitialize(); return 0; // Program successfully completed. } 原文:http://msdn.microsoft.com/en-us/library/windows/desktop/aa390423(v=vs.85).aspx
