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    copied!<p>As the <a href="http://msdn.microsoft.com/en-us/library/windows/desktop/aa394450%28v=vs.85%29.aspx" rel="nofollow"><code>MSDN</code></a> documentation states, the <code>Win32_SID</code> WMI class cannot be enumerated.</p> <p>So, you cannot use the ExecQuery method, instead use the <a href="http://msdn.microsoft.com/en-us/library/windows/desktop/aa392109%28v=vs.85%29.aspx" rel="nofollow"><code>IWbemServices::GetObject</code></a> function passing the proper WMI <a href="http://msdn.microsoft.com/en-us/library/windows/desktop/aa390350%28v=vs.85%29.aspx" rel="nofollow"><code>object path</code></a>. something like <code>Win32_SID.SID='S-1-5-82-1036420768-1044797643-1061213386-2937092688-4282445334'</code></p> <p>Try this sample</p> <pre><code>#include "stdafx.h" #define _WIN32_DCOM #include &lt;iostream&gt; using namespace std; #include &lt;comdef.h&gt; #include &lt;Wbemidl.h&gt; # pragma comment(lib, "wbemuuid.lib") #pragma argsused int main(int argc, char* argv[]) { BSTR strNetworkResource; strNetworkResource = L"\\\\.\\root\\CIMV2"; // Initialize COM. ------------------------------------------ HRESULT hres; hres = CoInitializeEx(0, COINIT_MULTITHREADED); if (FAILED(hres)) { cout &lt;&lt; "Failed to initialize COM library. Error code = 0x" &lt;&lt; hex &lt;&lt; hres &lt;&lt; endl; cout &lt;&lt; _com_error(hres).ErrorMessage() &lt;&lt; endl; cout &lt;&lt; "press enter to exit" &lt;&lt; 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 &lt;&lt; "Failed to initialize security. Error code = 0x" &lt;&lt; hex &lt;&lt; hres &lt;&lt; endl; cout &lt;&lt; _com_error(hres).ErrorMessage() &lt;&lt; endl; CoUninitialize(); cout &lt;&lt; "press enter to exit" &lt;&lt; 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 *) &amp;pLoc); if (FAILED(hres)) { cout &lt;&lt; "Failed to create IWbemLocator object." &lt;&lt; " Err code = 0x" &lt;&lt; hex &lt;&lt; hres &lt;&lt; endl; cout &lt;&lt; _com_error(hres).ErrorMessage() &lt;&lt; endl; CoUninitialize(); cout &lt;&lt; "press enter to exit" &lt;&lt; endl; cin.get(); return 1; // Program has failed. } // Connect to WMI through the IWbemLocator::ConnectServer method IWbemServices *pSvc = NULL; hres = pLoc-&gt;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 &amp;pSvc // pointer to IWbemServices proxy ); if (FAILED(hres)) { cout &lt;&lt; "Could not connect. Error code = 0x" &lt;&lt; hex &lt;&lt; hres &lt;&lt; endl; cout &lt;&lt; _com_error(hres).ErrorMessage() &lt;&lt; endl; pLoc-&gt;Release(); CoUninitialize(); cout &lt;&lt; "press enter to exit" &lt;&lt; endl; cin.get(); return 1; // Program has failed. } cout &lt;&lt; "Connected to root\\CIMV2 WMI namespace" &lt;&lt; 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 &lt;&lt; "Could not set proxy blanket. Error code = 0x" &lt;&lt; hex &lt;&lt; hres &lt;&lt; endl; cout &lt;&lt; _com_error(hres).ErrorMessage() &lt;&lt; endl; pSvc-&gt;Release(); pLoc-&gt;Release(); CoUninitialize(); cout &lt;&lt; "press enter to exit" &lt;&lt; endl; cin.get(); return 1; // Program has failed. } // Use the IWbemServices pointer to make requests of WMI ---- IWbemClassObject *pclsObj = NULL; hres = pSvc-&gt;GetObject(L"Win32_SID.SID='S-1-5-82-1036420768-1044797643-1061213386-2937092688-4282445334'", 0, NULL, &amp;pclsObj, NULL); if (FAILED(hres)) { cout &lt;&lt; "GetObject failed" &lt;&lt; " Error code = 0x" &lt;&lt; hex &lt;&lt; hres &lt;&lt; endl; cout &lt;&lt; _com_error(hres).ErrorMessage() &lt;&lt; endl; pSvc-&gt;Release(); pLoc-&gt;Release(); CoUninitialize(); cout &lt;&lt; "press enter to exit" &lt;&lt; endl; cin.get(); return 1; // Program has failed. } else { VARIANT vtProp; HRESULT hr = pclsObj-&gt;Get(L"AccountName", 0, &amp;vtProp, 0, 0);// String if (!FAILED(hr)) { if ((vtProp.vt==VT_NULL) || (vtProp.vt==VT_EMPTY)) wcout &lt;&lt; "AccountName : " &lt;&lt; ((vtProp.vt==VT_NULL) ? "NULL" : "EMPTY") &lt;&lt; endl; else wcout &lt;&lt; "AccountName : " &lt;&lt; vtProp.bstrVal &lt;&lt; endl; } VariantClear(&amp;vtProp); pclsObj-&gt;Release(); pclsObj=NULL; } // Cleanup pSvc-&gt;Release(); pLoc-&gt;Release(); if (pclsObj!=NULL) pclsObj-&gt;Release(); CoUninitialize(); cout &lt;&lt; "press enter to exit" &lt;&lt; endl; cin.get(); return 0; // Program successfully completed. } </code></pre>
 

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