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通过WMI的方式去设置LCD背光亮度
code如下:
#include "stdafx.h" #include <objbase.h> #include <windows.h> #include <stdio.h> #include <wbemidl.h> #include <comdef.h> #pragma comment(lib, "wbemuuid.lib") #pragma comment(lib, "comsuppw.lib") int _tmain(int argc, _TCHAR* argv[]) { IWbemLocator * pLocator = NULL; IWbemServices * pNamespace = 0; IWbemClassObject * pClass = NULL; IWbemClassObject * pInClass = NULL; IWbemClassObject * pInInst = NULL; IEnumWbemClassObject *pEnum = NULL; HRESULT hr = S_OK; BSTR path = SysAllocString(L"root\\wmi"); BSTR ClassPath = SysAllocString(L"WmiMonitorBrightnessMethods"); BSTR MethodName = SysAllocString(L"WmiSetBrightness"); BSTR ArgName0 = SysAllocString(L"Timeout"); BSTR ArgName1 = SysAllocString(L"Brightness"); BSTR bstrQuery = SysAllocString(L"Select * from WmiMonitorBrightnessMethods"); if (!path || ! ClassPath || !MethodName || ! ArgName0) { printf("SysAllocString failed. Out of memory.\n"); {printf("\n[-] Err: xxx");goto cleanup;} } // Initialize COM and connect up to CIMOM hr = CoInitialize(0); if (FAILED(hr)) { printf("CoInitialize returned 0x%x:", hr); {printf("\n[-] Err: CoInitialize");goto cleanup;} } // NOTE: // When using asynchronous WMI API's remotely in an environment where the "Local System" account // has no network identity (such as non-Kerberos domains), the authentication level of // RPC_C_AUTHN_LEVEL_NONE is needed. However, lowering the authentication level to // RPC_C_AUTHN_LEVEL_NONE makes your application less secure. It is wise to // use semi-synchronous API's for accessing WMI data and events instead of the asynchronous ones. hr = CoInitializeSecurity(NULL, -1, NULL, NULL, RPC_C_AUTHN_LEVEL_DEFAULT, RPC_C_IMP_LEVEL_IMPERSONATE, NULL, EOAC_NONE, //change to EOAC_NONE if you change dwAuthnLevel to RPC_C_AUTHN_LEVEL_NONE NULL ); if (FAILED(hr)) { printf("CoInitializeSecurity returned 0x%x:", hr); {printf("\n[-] Err: CoInitializeSecurity");goto cleanup;} } hr = CoCreateInstance(CLSID_WbemLocator, 0, CLSCTX_INPROC_SERVER, IID_IWbemLocator, (LPVOID *) &pLocator); if (FAILED(hr)) { printf("CoCreateInstance returned 0x%x:", hr); {printf("\n[-] Err: CoCreateInstance");goto cleanup;} } hr = pLocator->ConnectServer(path, NULL, NULL, NULL, 0, NULL, NULL, &pNamespace); printf("\nConnectServer returned 0x%x:", hr); if(hr != WBEM_S_NO_ERROR) {printf("\n[-] Err: ConnectServer");goto cleanup;} hr = CoSetProxyBlanket(pNamespace, RPC_C_AUTHN_WINNT, RPC_C_AUTHZ_NONE, NULL, RPC_C_AUTHN_LEVEL_CALL, RPC_C_IMP_LEVEL_IMPERSONATE, NULL, EOAC_NONE); if(hr != WBEM_S_NO_ERROR) {printf("\n[-] Err: CoSetProxyBlanket");goto cleanup;} hr =pNamespace->ExecQuery(_bstr_t(L"WQL"), //Query Language bstrQuery, //Query to Execute WBEM_FLAG_FORWARD_ONLY | WBEM_FLAG_RETURN_IMMEDIATELY, //Make a semi-synchronous call NULL, //Context &pEnum /*Enumeration Interface*/); if(hr != WBEM_S_NO_ERROR) {printf("\n[-] Err: ExecQuery");goto cleanup;} hr = WBEM_S_NO_ERROR; ULONG ulReturned; IWbemClassObject *pObj; DWORD retVal = 0; //Get the Next Object from the collection hr = pEnum->Next(WBEM_INFINITE, //Timeout 1, //No of objects requested &pObj, //Returned Object &ulReturned /*No of object returned*/); if(hr != WBEM_S_NO_ERROR) {printf("\n[-] Err: Next");goto cleanup;} // Get the class object hr = pNamespace->GetObject(ClassPath, 0, NULL, &pClass, NULL); printf("\nGetObject returned 0x%x:", hr); if(hr != WBEM_S_NO_ERROR) {printf("\n[-] Err: GetObject");goto cleanup;} // Get the input argument and set the property hr = pClass->GetMethod(MethodName, 0, &pInClass, NULL); printf("\nGetMethod returned 0x%x:", hr); if(hr != WBEM_S_NO_ERROR) {printf("\n[-] Err: GetMethod");goto cleanup;} hr = pInClass->SpawnInstance(0, &pInInst); printf("\nSpawnInstance returned 0x%x:", hr); if(hr != WBEM_S_NO_ERROR) {printf("\n[-] Err: SpawnInstance");goto cleanup;} VARIANT var1; VariantInit(&var1); V_VT(&var1) = VT_BSTR; V_BSTR(&var1) = SysAllocString(L"0"); hr = pInInst->Put(ArgName0, 0, &var1, CIM_UINT32); //CIM_UINT64 //var1.vt = VT_I4; //var1.ullVal = 0; //hr = pInInst->Put(ArgName0, 0, &var1, 0); printf("\nPut ArgName0 returned 0x%x:", hr); VariantClear(&var1); if(hr != WBEM_S_NO_ERROR) {printf("\n[-] Err: Put ArgName0");goto cleanup;} VARIANT var; VariantInit(&var); V_VT(&var) = VT_BSTR; V_BSTR(&var) = SysAllocString(L"100"); hr = pInInst->Put(ArgName1, 0, &var, CIM_UINT8); //var.vt=VT_UI1; //var.uiVal = 100; //hr = pInInst->Put(ArgName1, 0, &var, 0); VariantClear(&var); printf("\nPut ArgName1 returned 0x%x:", hr); if(hr != WBEM_S_NO_ERROR) {printf("\n[-] Err: Put ArgName1");goto cleanup;} // Call the method VARIANT pathVariable; VariantInit(&pathVariable); hr = pObj->Get(_bstr_t(L"__PATH"), 0, &pathVariable, NULL, NULL); printf("\npObj Get returned 0x%x:", hr); if(hr != WBEM_S_NO_ERROR) {printf("\n[-] Err: Get");goto cleanup;} hr =pNamespace->ExecMethod(pathVariable.bstrVal, MethodName, 0, NULL, pInInst, NULL, NULL); VariantClear(&pathVariable); printf("\nExecMethod returned 0x%x:", hr); if(hr != WBEM_S_NO_ERROR) {printf("\n[-] Err: ExecMethod");goto cleanup;} printf("Terminating normally\n"); // Free up resources cleanup: SysFreeString(path); SysFreeString(ClassPath); SysFreeString(MethodName); SysFreeString(ArgName0); SysFreeString(ArgName1); SysFreeString(bstrQuery); if (pClass) pClass->Release(); if (pInInst) pInInst->Release(); if (pInClass) pInClass->Release(); if (pLocator) pLocator->Release(); if (pNamespace) pNamespace->Release(); CoUninitialize(); return 0; }
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