捕获键盘键preSS背景 [英] Capture a keyboard keypress in the background

问题描述

我有在后台运行的应用程序一个。我不得不产生一些事件，每当用户preSS <大骨节病> F12 在任何时候。所以我需要一个捕获键盘preSS。在我的应用程序中，如果任何时候用户preSS <大骨节病> F10 将进行一些活动。我不明白该怎么做？

I have a application that runs in the background. I have to generate some event whenever a user press F12 at anytime. So what I need that to capture a key-press. In my application, if any time a user press F10 some event will be performed. I don't understand how to do that?

任何人有任何想法如何做到这一点？

Have anyone any idea how to do that?

N：A：
这是一个WinForms应用程序。它并不需要有关注我的形式。我的主窗口可能会保留在系统托盘中，但仍然要抓住关键preSS。

N:B: It is a winforms application. It doesn't need to have focus my form. My main window may remain in system tray but still it have to capture the keypress.

推荐答案

你想要的是一个全局热键

1. 导入所需的库在你的类的顶部：

1. Import needed libraries at the top of your class:

// DLL libraries used to manage hotkeys
[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);

添加在你的类中的字段，这将成为在code中的热键的引用：

Add a field in your class that will be a reference for the hotkey in your code:

const int MYACTION_HOTKEY_ID = 1;

注册热键（在Windows窗体的实例的构造函数）：

Register the hotkey (in the constructor of your Windows Form for instance):

// Modifier keys codes: Alt = 1, Ctrl = 2, Shift = 4, Win = 8
// Compute the addition of each combination of the keys you want to be pressed
// ALT+CTRL = 1 + 2 = 3 , CTRL+SHIFT = 2 + 4 = 6...
RegisterHotKey(this.Handle, MYACTION_HOTKEY_ID, 6, (int) Keys.F12);

在你的类中添加以下方法可以处理输入键：

Handle the typed keys by adding the following method in your class:

protected override void WndProc(ref Message m) {
    if (m.Msg == 0x0312 && m.WParam.ToInt32() == MYACTION_HOTKEY_ID) {
        // My hotkey has been typed

        // Do what you want here
        // ...
    }
    base.WndProc(ref m);
}

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