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POSet Fan Speed on Windows in C++
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  1. POSet Fan Speed on Windows in C++
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    copied!<p>I have this copied code from <a href="http://msdn.microsoft.com/en-us/library/aa390421%28VS.85%29.aspx" rel="nofollow noreferrer">Example: Calling a Provider Method</a>, it modified it now should it change CPU fan speed:</p> <pre><code>#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") int main(int iArgCnt, char ** argv) { if(IsDebuggerPresent())cout&lt;&lt;"Debugee?\n"; HRESULT hres; // Step 1: -------------------------------------------------- // Initialize COM. ------------------------------------------ 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; return 1; // Program has failed. } // Step 2: -------------------------------------------------- // Set general COM security levels -------------------------- // Note: If you are using Windows 2000, you must 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 negotiates service 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; 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 *) &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; CoUninitialize(); return 1; // Program has failed. } // Step 4: --------------------------------------------------- // Connect to WMI through the IWbemLocator::ConnectServer method IWbemServices *pSvc = NULL; // Connect to the local root\cimv2 namespace // and obtain pointer pSvc to make IWbemServices calls. hres = pLoc-&gt;ConnectServer( _bstr_t(L"ROOT\\CIMV2"), NULL, NULL, 0, NULL, 0, 0, &amp;pSvc ); if (FAILED(hres)) { cout &lt;&lt; "Could not connect. Error code = 0x" &lt;&lt; hex &lt;&lt; hres &lt;&lt; endl; pLoc-&gt;Release(); CoUninitialize(); return 1; // Program has failed. } cout &lt;&lt; "Connected to ROOT\\CIMV2 WMI namespace" &lt;&lt; endl; // Step 5: -------------------------------------------------- // Set security levels for 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; pSvc-&gt;Release(); pLoc-&gt;Release(); CoUninitialize(); return 1; // Program has failed. } // Step 6: -------------------------------------------------- // Use the IWbemServices pointer to make requests of WMI ---- BSTR MethodName = SysAllocString(L"SetSpeed"); BSTR ClassName = SysAllocString(L"CIM_Fan"); IWbemClassObject* pClass = NULL; hres = pSvc-&gt;GetObject(ClassName, 0, NULL, &amp;pClass, NULL); IWbemClassObject* pInParamsDefinition = NULL; hres = pClass-&gt;GetMethod(MethodName, 0, &amp;pInParamsDefinition, NULL); IWbemClassObject* pClassInstance = NULL; hres = pInParamsDefinition-&gt;SpawnInstance(0, &amp;pClassInstance); // Create the values for the in parameters VARIANT varCommand; varCommand.vt = VT_BSTR; varCommand.bstrVal = L"10"; // Store the value for the in parameters hres = pClassInstance-&gt;Put(L"CommandLine", 0, &amp;varCommand, 0); wprintf(L"The command is: %s\n", V_BSTR(&amp;varCommand)); // Execute Method IWbemClassObject* pOutParams = NULL; hres = pSvc-&gt;ExecMethod(ClassName, MethodName, 0, NULL, pClassInstance, &amp;pOutParams, NULL); if (FAILED(hres)) { cout &lt;&lt; "Could not execute method. Error code = 0x" &lt;&lt; hex &lt;&lt; hres &lt;&lt; endl; try{ VariantClear(&amp;varCommand); SysFreeString(ClassName); SysFreeString(MethodName); pClass-&gt;Release(); pInParamsDefinition-&gt;Release(); // pOutParams-&gt;Release(); pSvc-&gt;Release(); pLoc-&gt;Release(); CoUninitialize(); } catch(...){ cout&lt;&lt;""; // NOTHING }; system("pause"); return 1; // Program has failed. } // To see what the method returned, // use the following code. The return value will // be in &amp;varReturnValue VARIANT varReturnValue; hres = pOutParams-&gt;Get(_bstr_t(L"ReturnValue"), 0, &amp;varReturnValue, NULL, 0); // Clean up //-------------------------- VariantClear(&amp;varCommand); VariantClear(&amp;varReturnValue); SysFreeString(ClassName); SysFreeString(MethodName); pClass-&gt;Release(); pInParamsDefinition-&gt;Release(); pOutParams-&gt;Release(); pLoc-&gt;Release(); pSvc-&gt;Release(); CoUninitialize(); system("pause"); return 0; } </code></pre> <p>When I run this, it not work. What I should change?</p>
 

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