Liste toutes les propriétés de classe WMI en C++

Question

Deos quelqu'un connait un moyen, en C++, pour obtenir une liste complète de tous les biens disponibles dans une classe WMI donné? J'ai trouvé des questions similaires ici sur SO, mais ils utilisent tous Powershell, VB ou C#.

Answer 1

Vous pouvez utiliser la méthode GetObject pour obtenir une instance de la classe WMI et, en utilisant la méthode GetNames, vous pouvez récupérer les noms de propriétés.

Essayez cet échantillon.

#include "stdafx.h" 
#define _WIN32_DCOM 
#include <iostream> 
using namespace std; 
#include <comdef.h> 
#include <Wbemidl.h> 
# pragma comment(lib, "wbemuuid.lib") 

#pragma argsused 
int main(int argc, char* argv[]) 
{ 
    BSTR strNetworkResource; 
    //To use a WMI remote connection set localconn to false and configure the values of the pszName, pszPwd and the name of the remote machine in strNetworkResource 
    bool localconn = true; 
    strNetworkResource = localconn ? L"\\\\.\\root\\CIMV2" : L"\\\\remote--machine\\root\\CIMV2"; 

    // Initialize COM. ------------------------------------------ 

    HRESULT hres; 
    hres = CoInitializeEx(0, COINIT_MULTITHREADED); 
    if (FAILED(hres)) 
    { 
     cout << "Failed to initialize COM library. Error code = 0x" << hex << hres << endl; 
     cout << _com_error(hres).ErrorMessage() << endl; 
     cout << "press enter to exit" << endl; 
     cin.get();  
     return 1;     // Program has failed. 
    } 

    // Set general COM security levels -------------------------- 


     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; 
     cout << _com_error(hres).ErrorMessage() << endl; 
     CoUninitialize(); 
     cout << "press enter to exit" << endl; 
     cin.get();  
     return 1;     // Program has failed. 
    } 

    // 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; 
     cout << _com_error(hres).ErrorMessage() << endl; 
     CoUninitialize();  
     cout << "press enter to exit" << endl; 
     cin.get();  
     return 1;     // Program has failed. 
    } 

    // Connect to WMI through the IWbemLocator::ConnectServer method 

    IWbemServices *pSvc = NULL; 


     hres = pLoc->ConnectServer(
      _bstr_t(strNetworkResource),  // 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;  
     cout << _com_error(hres).ErrorMessage() << endl; 
     pLoc->Release(); 
     CoUninitialize(); 
     cout << "press enter to exit" << endl; 
     cin.get();   
     return 1;    // Program has failed. 
    } 

    cout << "Connected to root\\CIMV2 WMI namespace" << endl; 

    // 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; 
     cout << _com_error(hres).ErrorMessage() << endl; 
     pSvc->Release(); 
     pLoc->Release(); 
     CoUninitialize(); 
     cout << "press enter to exit" << endl; 
     cin.get();  
     return 1;    // Program has failed. 
    } 

    // Use the IWbemServices pointer to make requests of WMI ---- 
    IWbemClassObject* pClass = NULL; 
    hres = pSvc->GetObject(L"Win32_Process", 0, NULL, &pClass, NULL); 

    if (FAILED(hres)) 
    { 
     cout << "GetObject failed" << " Error code = 0x" << hex << hres << endl; 
     cout << _com_error(hres).ErrorMessage() << endl; 
     pSvc->Release(); 
     pLoc->Release(); 
     CoUninitialize(); 
     cout << "press enter to exit" << endl; 
     cin.get();  
     return 1;    // Program has failed. 
    } 

    SAFEARRAY *psaNames = NULL; 
    hres = pClass->GetNames(
     NULL, 
     WBEM_FLAG_ALWAYS | WBEM_FLAG_NONSYSTEM_ONLY, 
     NULL, 
     &psaNames); 


    if (FAILED(hres)) 
    { 
     cout << "GetNames failed" << " Error code = 0x" << hex << hres << endl; 
     cout << _com_error(hres).ErrorMessage() << endl; 
     pSvc->Release(); 
     pLoc->Release(); 
     CoUninitialize(); 
     cout << "press enter to exit" << endl; 
     cin.get();  
     return 1;    // Program has failed. 
    } 


    // Get the number of properties. 
    long lLower, lUpper; 
    BSTR PropName = NULL; 
    SafeArrayGetLBound(psaNames, 1, &lLower); 
    SafeArrayGetUBound(psaNames, 1, &lUpper); 

     for (long i = lLower; i <= lUpper; i++) 
     { 
      // Get this property. 
      hres = SafeArrayGetElement(
       psaNames, 
       &i, 
       &PropName); 

       wcout << PropName<< endl; 
       SysFreeString(PropName); 
     } 

    SafeArrayDestroy(psaNames); 
    ULONG uReturn = 0; 


    pSvc->Release(); 
    pLoc->Release(); 

    CoUninitialize(); 
    cout << "press enter to exit" << endl; 
    cin.get(); 
    return 0; // Program successfully completed. 
} 

Answer 2

Vous utilisez IWbemClassObject::GetNames pour obtenir une liste des propriétés après avoir obtenu une instance de classe à partir d'une requête WMI ou énumération.