Question

有人会在Windows系统中使用 vc ++ 指导我如何获得亮度变化事件吗？或者我需要在它改变时获得亮度滑块值。任何帮助将非常感激。

提前致谢。

Answer 1

迟到的答案，但因为我一直在寻找同样的事情。虽然控制亮度确实不是Windows任务，但有时也是驱动程序的任务，也可能直接与ACPI调用相关，但我们仍然可以通过实现WMI事件从Windows获取有关其更改的一些信息。特别是，您需要实现WmiMonitorBrightnessEvent，它将在Windows收到亮度变化事件时为您提供所需的信息。下面的示例代码是在@RRUZ answer here中直接转换为C＃代码的C ++ / CLI，在那里他使用了WmiMonitorBrightnessEvent。

<强> EventWatcherAsync.h

#pragma once
using namespace System;
using namespace System::Management;

ref class EventWatcherAsync
{
public:
    void WmiEventHandler(Object^ sender, EventArrivedEventArgs^ e);
    EventWatcherAsync();
};

<强> EventWatcherAsync.cpp

#include "stdafx.h"
#include "EventWatcherAsync.h"

void EventWatcherAsync::WmiEventHandler(Object^ sender, EventArrivedEventArgs^ e)
{
    Console::WriteLine("Active :          " + e->NewEvent->Properties["Active"]->Value->ToString());
    Console::WriteLine("Brightness :      " + e->NewEvent->Properties["Brightness"]->Value->ToString());
    Console::WriteLine("InstanceName :    " + e->NewEvent->Properties["InstanceName"]->Value->ToString());
}

EventWatcherAsync::EventWatcherAsync()
{
    try
    {
        System::String^ ComputerName = "localhost";
        System::String^ WmiQuery;
        ManagementEventWatcher^ Watcher;
        ManagementScope^ Scope;


        if (ComputerName != "localhost")
        {
            ConnectionOptions^ Conn = gcnew ConnectionOptions();
            Conn->Username = "";
            Conn->Password = "";
            Conn->Authority = "ntlmdomain:DOMAIN";
            Scope = gcnew ManagementScope(String::Format("\\\\{0}\\root\\WMI", ComputerName), Conn);
        }
        else
            Scope = gcnew ManagementScope(String::Format("\\\\{0}\\root\\WMI", ComputerName));
        Scope->Connect();

        WmiQuery = "Select * From WmiMonitorBrightnessEvent";

        Watcher = gcnew ManagementEventWatcher(Scope, gcnew EventQuery(WmiQuery));
        Watcher->EventArrived += gcnew EventArrivedEventHandler(this, &EventWatcherAsync::WmiEventHandler);
        Watcher->Start();
        Console::Read();
        Watcher->Stop();
    }
    catch (Exception^ e)
    {
        Console::WriteLine("Exception {0} Trace {1}", e->Message, e->StackTrace);
    }
}

<强> Main.cpp的

#include "stdafx.h"
#include "EventWatcherAsync.h"

using namespace System;

int main(array<System::String ^> ^args)
{
    Console::WriteLine("Listening {0}", "WmiMonitorBrightnessEvent");
    Console::WriteLine("Press Enter to exit");
    EventWatcherAsync^ eventWatcher = gcnew EventWatcherAsync();
    Console::Read();
    return 0;
}

在Windows中获取系统亮度事件

1 个答案: