监控屏幕背光Brightness变化的通知

最新推荐文章于 2025-05-25 16:50:21 发布

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最新推荐文章于 2025-05-25 16:50:21 发布 · 1.3k 阅读

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CC 4.0 BY-SA版权

文章标签：

#Brightness #Backlight #WmiMonitorBrightness #WmiMonitorBrightnessMethods

MS网站上给出了用Power Shell的方式用来设置/获取Brightness的值。

为了方便使用，将相关接口进行了封装：

#pragma once

#include <initguid.h>
#include <cguid.h>
#include <atlcomcli.h>
#include <atlcoll.h>
#include <comdef.h>
#include <WbemIdl.h>
#pragma comment(lib, "wbemuuid.lib")

typedef void (*PFN_CALLBACK)(DWORD dwBrightness, LPVOID lpContext);

class CBrightnessCtrl : public IWbemObjectSink
{
public:
	CBrightnessCtrl(PFN_CALLBACK pCallback, LPVOID lpContext);
	~CBrightnessCtrl(void);

public:
	inline BOOL VerifyValid(void) { return (NULL != this) ? m_bValid : FALSE; }
	BOOL Get(DWORD* pdwValue);
	BOOL Set(DWORD dwValue);

public:
	virtual ULONG STDMETHODCALLTYPE AddRef();
	virtual ULONG STDMETHODCALLTYPE Release();
	virtual HRESULT STDMETHODCALLTYPE QueryInterface(REFIID riid, void** ppv);
	virtual HRESULT STDMETHODCALLTYPE Indicate(LONG lObjectCount, IWbemClassObject __RPC_FAR *__RPC_FAR *apObjArray);
	virtual HRESULT STDMETHODCALLTYPE SetStatus(
		/* [in] */ LONG lFlags,
		/* [in] */ HRESULT hResult,
		/* [in] */ BSTR strParam,
		/* [in] */ IWbemClassObject __RPC_FAR *pObjParam
	);

private:
	BOOL Initialize(void);
	void Uninitialize(void);
	BOOL m_bValid;

private:
	LONG m_lRefCount;

	IWbemLocator* m_pLocator;
	IWbemServices* m_pService;
	IUnsecuredApartment* m_pUnsecuredApartment;
	IUnknown* m_pStubUnkown;
	IWbemObjectSink* m_pStubSink;

	PFN_CALLBACK m_pCallback;
	LPVOID m_pContext;
};

#include "stdafx.h"
#include "BrightnessCtrl.h"


CBrightnessCtrl::CBrightnessCtrl(PFN_CALLBACK pCallback, LPVOID lpContext)
	: m_pCallback(pCallback)
	, m_pContext(lpContext)
	, m_pLocator(NULL)
	, m_pService(NULL)
	, m_pUnsecuredApartment(NULL)
	, m_pStubUnkown(NULL)
	, m_pStubSink(NULL)
	, m_bValid(FALSE