1 #include "stdafx.h"
  2 #define _WIN32_DCOM
  3 #include <iostream>
  4 using namespace std;
  5 #include <comdef.h>
  6 #include <Wbemidl.h>
  7 # pragma comment(lib, "wbemuuid.lib")
  8 
  9 
 10 // Monitor‘s basic connection parameters
 11 
 12 #pragma argsused
 13 int main(int argc, char* argv[])
 14 {
 15     BSTR strNetworkResource;
 16     //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
 17     strNetworkResource = L"\\\\.\\root\\WMI";
 18 
 19     COAUTHIDENTITY *userAcct =  NULL ;
 20     COAUTHIDENTITY authIdent;
 21 
 22     // Initialize COM. ------------------------------------------
 23 
 24     HRESULT hres;
 25     hres =  CoInitializeEx(0, COINIT_MULTITHREADED);
 26     if (FAILED(hres))
 27     {
 28         cout << "Failed to initialize COM library. Error code = 0x" << hex << hres << endl;
 29         cout << _com_error(hres).ErrorMessage() << endl;
 30         cout << "press enter to exit" << endl;
 31         cin.get();      
 32         return 1;                  // Program has failed.
 33     }
 34 
 35     // Set general COM security levels --------------------------
 36 
 37         hres =  CoInitializeSecurity(
 38             NULL,
 39             -1,                          // COM authentication
 40             NULL,                        // Authentication services
 41             NULL,                        // Reserved
 42             RPC_C_AUTHN_LEVEL_DEFAULT,   // Default authentication
 43             RPC_C_IMP_LEVEL_IMPERSONATE, // Default Impersonation
 44             NULL,                        // Authentication info
 45             EOAC_NONE,                   // Additional capabilities
 46             NULL                         // Reserved
 47             );
 48 
 49     if (FAILED(hres))
 50     {
 51         cout << "Failed to initialize security. Error code = 0x" << hex << hres << endl;
 52         cout << _com_error(hres).ErrorMessage() << endl;
 53         CoUninitialize();
 54         cout << "press enter to exit" << endl;
 55         cin.get();      
 56         return 1;                    // Program has failed.
 57     }
 58 
 59     // Obtain the initial locator to WMI -------------------------
 60 
 61     IWbemLocator *pLoc = NULL;
 62     hres = CoCreateInstance(CLSID_WbemLocator, 0, CLSCTX_INPROC_SERVER, IID_IWbemLocator, (LPVOID *) &pLoc);
 63 
 64     if (FAILED(hres))
 65     {
 66         cout << "Failed to create IWbemLocator object." << " Err code = 0x" << hex << hres << endl;
 67         cout << _com_error(hres).ErrorMessage() << endl;
 68         CoUninitialize();       
 69         cout << "press enter to exit" << endl;
 70         cin.get();      
 71         return 1;                 // Program has failed.
 72     }
 73 
 74     // Connect to WMI through the IWbemLocator::ConnectServer method
 75 
 76     IWbemServices *pSvc = NULL;
 77 
 78         hres = pLoc->ConnectServer(
 79              _bstr_t(strNetworkResource),      // Object path of WMI namespace
 80              NULL,                    // User name. NULL = current user
 81              NULL,                    // User password. NULL = current
 82              0,                       // Locale. NULL indicates current
 83              NULL,                    // Security flags.
 84              0,                       // Authority (e.g. Kerberos)
 85              0,                       // Context object
 86              &pSvc                    // pointer to IWbemServices proxy
 87              );
 88 
 89     if (FAILED(hres))
 90     {
 91         cout << "Could not connect. Error code = 0x" << hex << hres << endl;    
 92         cout << _com_error(hres).ErrorMessage() << endl;
 93         pLoc->Release();
 94         CoUninitialize();
 95         cout << "press enter to exit" << endl;
 96         cin.get();          
 97         return 1;                // Program has failed.
 98     }
 99 
100     cout << "Connected to root\\WMI WMI namespace" << endl;
101 
102     // Set security levels on the proxy -------------------------
103         hres = CoSetProxyBlanket(
104            pSvc,                        // Indicates the proxy to set
105            RPC_C_AUTHN_WINNT,           // RPC_C_AUTHN_xxx
106            RPC_C_AUTHZ_NONE,            // RPC_C_AUTHZ_xxx
107            NULL,                        // Server principal name
108            RPC_C_AUTHN_LEVEL_CALL,      // RPC_C_AUTHN_LEVEL_xxx
109            RPC_C_IMP_LEVEL_IMPERSONATE, // RPC_C_IMP_LEVEL_xxx
110            NULL,                        // client identity
111            EOAC_NONE                    // proxy capabilities
112         );
113 
114     if (FAILED(hres))
115     {
116         cout << "Could not set proxy blanket. Error code = 0x" << hex << hres << endl;
117         cout << _com_error(hres).ErrorMessage() << endl;
118         pSvc->Release();
119         pLoc->Release();
120         CoUninitialize();
121         cout << "press enter to exit" << endl;
122         cin.get();      
123         return 1;               // Program has failed.
124     }
125 
126     // Use the IWbemServices pointer to make requests of WMI ----
127 
128     IEnumWbemClassObject* pEnumerator = NULL;
129     hres = pSvc->ExecQuery( L"WQL", L"SELECT * FROM WmiMonitorConnectionParams",
130     WBEM_FLAG_FORWARD_ONLY | WBEM_FLAG_RETURN_IMMEDIATELY, NULL, &pEnumerator);
131 
132     if (FAILED(hres))
133     {
134         cout << "ExecQuery failed" << " Error code = 0x"    << hex << hres << endl;
135         cout << _com_error(hres).ErrorMessage() << endl;
136         pSvc->Release();
137         pLoc->Release();
138         CoUninitialize();
139         cout << "press enter to exit" << endl;
140         cin.get();      
141         return 1;               // Program has failed.
142     }
143 
144 
145     // Get the data from the WQL sentence
146     IWbemClassObject *pclsObj = NULL;
147     ULONG uReturn = 0;
148 
149     while (pEnumerator)
150     {
151         HRESULT hr = pEnumerator->Next(WBEM_INFINITE, 1, &pclsObj, &uReturn);
152 
153         if(0 == uReturn || FAILED(hr))
154           break;
155 
156         VARIANT vtProp;
157 
158                 hr = pclsObj->Get(L"Active", 0, &vtProp, 0, 0);// Boolean
159                 if (!FAILED(hr))
160                 {
161                   if ((vtProp.vt==VT_NULL) || (vtProp.vt==VT_EMPTY))
162                     wcout << "Active : " << ((vtProp.vt==VT_NULL) ? "NULL" : "EMPTY") << endl;
163                   else
164                     wcout << "Active : " << (vtProp.boolVal ? "True" : "False") << endl;
165                 }
166                 VariantClear(&vtProp);
167 
168                 hr = pclsObj->Get(L"InstanceName", 0, &vtProp, 0, 0);// String
169                 if (!FAILED(hr))
170                 {
171                   if ((vtProp.vt==VT_NULL) || (vtProp.vt==VT_EMPTY))
172                     wcout << "InstanceName : " << ((vtProp.vt==VT_NULL) ? "NULL" : "EMPTY") << endl;
173                   else
174                     wcout << "InstanceName : " << vtProp.bstrVal << endl;
175                 }
176                 VariantClear(&vtProp);
177 
178                 hr = pclsObj->Get(L"VideoOutputTechnology", 0, &vtProp, 0, 0);// Uint32
179                 if (!FAILED(hr))
180                 {
181                   if ((vtProp.vt==VT_NULL) || (vtProp.vt==VT_EMPTY))
182                     wcout << "VideoOutputTechnology : " << ((vtProp.vt==VT_NULL) ? "NULL" : "EMPTY") << endl;
183                   else
184                     wcout << "VideoOutputTechnology : " << vtProp.uintVal << endl;
185                 }
186                 VariantClear(&vtProp);
187 
188 
189         pclsObj->Release();
190         pclsObj=NULL;
191     }
192 
193     // Cleanup
194 
195     pSvc->Release();
196     pLoc->Release();
197     pEnumerator->Release();
198     if (pclsObj!=NULL)
199      pclsObj->Release();
200 
201     CoUninitialize();
202     cout << "press enter to exit" << endl;
203     cin.get();
204     return 0;   // Program successfully completed.
205 }