笔记本屏幕亮度背光调节工具 c++ 用来解决亮度调节功能键失效问题

某次windows10 大更新，坑啊，调节亮度的快捷键失效了，多次卸载集显驱动和重新安装没有解决，无奈使用电源管理里面的亮度滑竿几个月后，更新了win10 1803，本想能解决这个问题，然而。。。无奈只能自力更生，通过其他办法解决问题

一开始看到的是 Monitor Monitor Configuration Functions ，
https://blog.csdn.net/tody_guo/article/details/16898749
https://msdn.microsoft.com/en-us/library/ms775232(v=vs.85).aspx
估计微软停止维护这套api很久了，获取的 physical monitor handle 总是为0，此法不行
然后找到一个瞎眼的调gammer。。。。
最后找到这个 https://blog.csdn.net/tody_guo/article/details/30255233
获得最终解决办法

本文工具核心代码以及思路均来自
https://blog.csdn.net/tody_guo/article/details/30255233

核心原理是使用 c++连接 wmi 服务，进而修改笔记本屏幕 lcd 背光亮度
wmi 接口路径
调节亮度类接口
root\wmi\WmiMonitorBrightnessMethods
获取当前亮度类接口
root\wmi\WmiMonitorBrightness

使用和细节：
因为无法使用fn当作热键，所以我使用 shift + alt 来代替
此程序目前硬编码为
shift + alt + f8 降低 5% 亮度
shift + alt + f9 提升 5% 亮度
可以在第252行和第253行修改硬编码的热键
在第184行修改硬编码一阶亮度值

结束程序请使用任务管理器直接结束
程序使用单例模式
程序没有窗口，请在任务管理器里面检查程序是否启动成功

vs2017工程
微云：https://share.weiyun.com/5cluRgV

完整源代码如下

#include <iostream>
#include <string>
#include <windows.h>
#include <objbase.h>
#include <wbemidl.h>
#include <comdef.h>
#include <mutex>#pragma comment(lib, "wbemuuid.lib")
#pragma comment(lib, "comsuppw.lib")using namespace std;// wmi namespace
IWbemLocator  *wmiLocator = NULL;
IWbemServices *wmiNamespace = 0;
BSTR wmiPath = SysAllocString(L"root\\wmi");
HRESULT hr = S_OK;// brightnessAdjustmentClass
IWbemClassObject *brightnessAdjustmentClass = NULL;
IWbemClassObject *brightnessAdjustmentClassInstant = NULL;
IWbemClassObject *brightnessAdjustmentClassObject = NULL;
IWbemClassObject *brightnessAdjustmentMethodInstant = NULL;
IEnumWbemClassObject *brightnessAdjustmentClassEnum = NULL;BSTR brightnessAdjustmentClassPath = SysAllocString(L"WmiMonitorBrightnessMethods");
BSTR brightnessAdjustmentMethodName = SysAllocString(L"WmiSetBrightness");
BSTR brightnessAdjustmentMethodArgName1 = SysAllocString(L"Timeout");
BSTR brightnessAdjustmentMethodArgName2 = SysAllocString(L"Brightness");
BSTR brightnessAdjustmentClassQuery = SysAllocString(L"Select * from WmiMonitorBrightnessMethods");// brightnessClass
IEnumWbemClassObject *brightnessClassEnum = NULL;
//IWbemClassObject *brightnessClass = NULL;
IWbemClassObject *brightnessClassObject = NULL;BSTR brightnessClassPath = SysAllocString(L"WmiMonitorBrightness");
BSTR brightnessVariableName = SysAllocString(L"CurrentBrightness");
BSTR brightnessQuery = SysAllocString(L"Select * from WmiMonitorBrightness");int Init()
{// Initialize COM and connect up to CIMOM  hr = CoInitialize(0);if (FAILED(hr))return -1;hr = CoInitializeSecurity(NULL, -1, NULL, NULL, RPC_C_AUTHN_LEVEL_DEFAULT, RPC_C_IMP_LEVEL_IMPERSONATE, NULL, EOAC_NONE, NULL);if (FAILED(hr))return -1;hr = CoCreateInstance(CLSID_WbemLocator, 0, CLSCTX_INPROC_SERVER, IID_IWbemLocator, (LPVOID *)&wmiLocator);if (FAILED(hr))return -1;hr = wmiLocator->ConnectServer(wmiPath, NULL, NULL, NULL, 0, NULL, NULL, &wmiNamespace);if (hr != WBEM_S_NO_ERROR)return -1;hr = CoSetProxyBlanket(wmiNamespace, 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)return -1;// query variable enumhr = wmiNamespace->ExecQuery(_bstr_t(L"WQL"), brightnessAdjustmentClassQuery, WBEM_FLAG_FORWARD_ONLY | WBEM_FLAG_RETURN_IMMEDIATELY, NULL, &brightnessAdjustmentClassEnum);if (hr != WBEM_S_NO_ERROR)return -1;/*hr = wmiNamespace->ExecQuery(_bstr_t(L"WQL"), brightnessQuery, WBEM_FLAG_FORWARD_ONLY | WBEM_FLAG_RETURN_IMMEDIATELY, NULL, &brightnessClassEnum);if (hr != WBEM_S_NO_ERROR)return -1;*/// get class objULONG ret;hr = brightnessAdjustmentClassEnum->Next(WBEM_INFINITE, 1, &brightnessAdjustmentClassObject, &ret);if (hr != WBEM_S_NO_ERROR)return -1;hr = wmiNamespace->GetObject(brightnessAdjustmentClassPath, 0, NULL, &brightnessAdjustmentClass, NULL);if (hr != WBEM_S_NO_ERROR)return -1;// get brightness adjust method instanthr = brightnessAdjustmentClass->GetMethod(brightnessAdjustmentMethodName, 0, &brightnessAdjustmentClassInstant, NULL);if (hr != WBEM_S_NO_ERROR)return -1;hr = brightnessAdjustmentClassInstant->SpawnInstance(0, &brightnessAdjustmentMethodInstant);if (hr != WBEM_S_NO_ERROR)return -1;return 0;
}int GetBrightness()
{// 每次都需要查询if (brightnessClassEnum) brightnessClassEnum->Release();if (brightnessClassObject) brightnessClassObject->Release();HRESULT hr = wmiNamespace->ExecQuery(_bstr_t(L"WQL"), brightnessQuery, WBEM_FLAG_FORWARD_ONLY | WBEM_FLAG_RETURN_IMMEDIATELY, NULL, &brightnessClassEnum);if (hr != WBEM_S_NO_ERROR)return -1;DWORD ret;hr = brightnessClassEnum->Next(WBEM_INFINITE, 1, &brightnessClassObject, &ret);if (hr != WBEM_S_NO_ERROR)return -1;// 获得亮度值VARIANT brightnessValue;VariantInit(&brightnessValue);hr = brightnessClassObject->Get(brightnessVariableName, 0, &brightnessValue, 0, 0);if (hr != WBEM_S_NO_ERROR)return -1;return brightnessValue.uintVal;
}int SetBrightness(int brightness)
{// 亮度范围是 [0, 100]brightness = min(max(brightness, 0), 100);// write brightness adjust paramsVARIANT var;VariantInit(&var);V_VT(&var) = VT_BSTR;// write timeout paramV_BSTR(&var) = SysAllocString(L"0");hr = brightnessAdjustmentMethodInstant->Put(brightnessAdjustmentMethodArgName1, 0, &var, CIM_UINT32);if (hr != WBEM_S_NO_ERROR)return -1;// write brightness paramV_BSTR(&var) = SysAllocString(to_wstring(brightness).c_str());hr = brightnessAdjustmentMethodInstant->Put(brightnessAdjustmentMethodArgName2, 0, &var, CIM_UINT8);VariantClear(&var);if (hr != WBEM_S_NO_ERROR)return -1;// 获取 method instant path 和 executeVARIANT pathVariable;VariantInit(&pathVariable);hr = brightnessAdjustmentClassObject->Get(_bstr_t(L"__PATH"), 0, &pathVariable, NULL, NULL);if (hr != WBEM_S_NO_ERROR)return -1;hr =wmiNamespace->ExecMethod(pathVariable.bstrVal, brightnessAdjustmentMethodName, 0, NULL, brightnessAdjustmentMethodInstant, NULL, NULL);VariantClear(&pathVariable);if (hr != WBEM_S_NO_ERROR)return -1;return 0;
}void Cleanup()
{// 清理SysFreeString(wmiPath);SysFreeString(brightnessAdjustmentClassPath);SysFreeString(brightnessAdjustmentMethodName);SysFreeString(brightnessAdjustmentMethodArgName1);SysFreeString(brightnessAdjustmentMethodArgName2);SysFreeString(brightnessAdjustmentClassQuery);SysFreeString(brightnessClassPath);SysFreeString(brightnessVariableName);SysFreeString(brightnessQuery);brightnessAdjustmentClass->Release();brightnessAdjustmentMethodInstant->Release();brightnessAdjustmentClassInstant->Release();brightnessAdjustmentClassObject->Release();brightnessAdjustmentClassEnum->Release();//if (brightnessClass) brightnessClass->Release();brightnessClassObject->Release();brightnessClassEnum->Release();wmiNamespace->Release();wmiLocator->Release();CoUninitialize();
}// 亮度进阶值
const int incrementValue = 5;void IncreaseBrightness()
{// 提升一阶亮度int i = GetBrightness();SetBrightness(i + incrementValue);
}
void ReduceBrightness()
{// 降低一阶亮度int i = GetBrightness();SetBrightness(i - incrementValue);
}ATOM hotKeyId1, hotKeyId2;LRESULT __stdcall WndProc(HWND hWnd, UINT Msg, WPARAM wParam, LPARAM lParam)
{switch (Msg){case WM_DESTROY:PostQuitMessage(0);break;case WM_HOTKEY:if (wParam == hotKeyId1)PostMessageA(0, WM_USER + 1, 0, 0);else if (wParam == hotKeyId2)PostMessageA(0, WM_USER + 2, 0, 0);break;}return DefWindowProcA(hWnd, Msg, wParam, lParam);
}int __stdcall WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nCmdShow)
{// 全局唯一auto m = CreateMutexA(NULL, TRUE, "{CAF16FA1-1E0C-419B-9D45-99B5719ED318}");if (ERROR_ALREADY_EXISTS == GetLastError())return -1;int r = Init();if (r != 0)return -1;//创建隐藏窗口，仅用于捕获热键WNDCLASSEX wcex;memset(&wcex, 0, sizeof(wcex));wcex.cbSize     = sizeof(wcex);wcex.style      = 0;wcex.lpfnWndProc= WndProc;wcex.cbClsExtra = 0;wcex.cbWndExtra = 0;wcex.hInstance  = GetModuleHandleA(0);wcex.hIcon      = 0;wcex.hCursor    = 0;wcex.hbrBackground  = 0;wcex.lpszMenuName   = 0;wcex.lpszClassName  = "test";if (RegisterClassExA(&wcex) == FALSE)return -1;HWND hwnd = CreateWindowA("test", "", WS_EX_NOACTIVATE, 0, 0, 0, 0, 0, 0, GetModuleHandleA(0), 0);ShowWindow(hwnd, SW_HIDE);//注册热键hotKeyId1 = GlobalAddAtom("MonitorBrightnessAdjuster1") - 0xc000;hotKeyId2 = GlobalAddAtom("MonitorBrightnessAdjuster2") - 0xc000;int b = RegisterHotKey(hwnd, hotKeyId1, MOD_SHIFT | MOD_ALT, VK_F8);b = RegisterHotKey(hwnd, hotKeyId2, MOD_SHIFT | MOD_ALT, VK_F9);MSG msg;while (GetMessageA(&msg, 0, 0, 0)){TranslateMessage(&msg);DispatchMessageW(&msg);if (msg.message == WM_USER + 1)ReduceBrightness();else if (msg.message == WM_USER + 2)IncreaseBrightness();}// 一般不会到达这里，一般是直接任务管理器结束此程序// 清理UnregisterHotKey(hwnd, hotKeyId1);UnregisterHotKey(hwnd, hotKeyId2);GlobalDeleteAtom(hotKeyId1);GlobalDeleteAtom(hotKeyId2);Cleanup();return 0;
}

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