在C#中使用全局热键捕获键 [英] key capture using global hotkey in C#

问题描述

我有一个在后台运行的应用程序，就像我可以将我的应用程序保留在系统托盘中.如果它仍保留在系统托盘中，则我的应用程序将完成它的工作.每当用户按下F10或F9时，便会完成一些工作.我试过了:

I have a application that runs in the background like i may keep my app in the system tray.If it remains on system tray my app will do it's job. Whenever a user press F10 or F9 some works will be done. i tried this:

public partial class Form1 : Form
{
    public int a = 1;

    [DllImport("user32.dll")]
    public static extern bool RegisterHotKey(IntPtr hWnd, int id, int fsModifiers, int vlc);
    [DllImport("user32.dll")]
    public static extern bool UnregisterHotKey(IntPtr hWnd, int id);


    [DllImport("User32.dll")]
    private static extern short GetAsyncKeyState(System.Windows.Forms.Keys vKey);
    [DllImport("User32.dll")]
    private static extern short GetAsyncKeyState(System.Int32 vKey);

    const int MYACTION_HOTKEY_ID = 1;

    public Form1()
    {
        InitializeComponent();
        RegisterHotKey(this.Handle, MYACTION_HOTKEY_ID, 0, (int) Keys.F9);
        RegisterHotKey(this.Handle, MYACTION_HOTKEY_ID, 0, (int)Keys.F10);

        this.ShowInTaskbar = false;
    }

    protected override void WndProc(ref Message m)
    {
        if (m.Msg == 0x0312 && m.WParam.ToInt32() == MYACTION_HOTKEY_ID && (GetAsyncKeyState(Keys.F9) == -32767))
        {
            if ((a % 2) != 0)
            {
                a++;
                MessageBox.Show(a.ToString()+"not equal F9");
                label1.Text = "not equal F9";
            }

            if ((a % 2) == 0)
            {
                a++;
                MessageBox.Show(a.ToString()+"equal F9");
                label1.Text = " equal F9";
            }

        }

        else if (m.Msg == 0x0312 && m.WParam.ToInt32() == MYACTION_HOTKEY_ID && (GetAsyncKeyState(Keys.F10) == -32767))
        {
            if ((a % 2) != 0)
            {
                a++;
                MessageBox.Show(a.ToString() + "not equal F10");
                label1.Text = "not equal F10";
            }

            if ((a % 2) == 0)
            {
                a++;
                MessageBox.Show(a.ToString() + "equal F10");
                label1.Text = " equal F10";
            }

        }
        base.WndProc(ref m);
    }

}

当我使用set"this.ShowInTaskbar = false"时，此行不起作用.但是，如果我不设置此行，它将正常工作.对于我的应用程序，我必须使用此行.如何解决此问题? ???

As i use set "this.ShowInTaskbar = false" this line it doesn't work.But if i don't set this it works fine.For my app i have to use this line.How can i solve this????

推荐答案

您需要订阅操作系统通过诸如RegisterHotKey()之类的本机函数调用发送的某些消息.调用此函数时，通过指定窗口的Handle来告诉操作系统将消息发送到哪个窗口，可以将其视为地址.当您设置ShowInTaskbar = false时，句柄将发生更改，因此操作系统将不知道可以到达您的位置.

You need to subscribe to certain messages that the operating system sends by means of a native function call like RegisterHotKey(). When you call this function You tell the operating system which window to send the messages to by specifying the Handle of the window, this can be considered an address. When you set ShowInTaskbar = false the handle changes so the operating system will not know where to reach you.

请参阅第一个方案:

RegisterHotKey(this.Handle, MYACTION_HOTKEY_ID, 0, (int) Keys.F9);

要解决您的问题，您可以创建一个从提供窗口句柄和窗口过程的低级封装."并从该类中(或至少使用该类的句柄，具体取决于您的实施)，请使用永不更改的句柄注册热键.

To resolve your issue you can create a class that derives from NativeWindow which "Provides a low-level encapsulation of a window handle and a window procedure." and from within that class (or at least using that class's handle depending on your implementation), register the hotkeys using a handle that will never change.

public sealed class HotkeyManager : NativeWindow, IDisposable
{
    public HotkeyManager()
    {
        CreateHandle(new CreateParams());
    }

    protected override void WndProc(ref Message m)
    {
        if (m.Msg == Constants.WM_HOTKEY)
        {
             //handle hotkey message
        }
        base.WndProc(ref m);
    }

    public void Dispose()
    {
        DestroyHandle();
    }
}

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