最小化时检测按键和托盘图标
对于我的测试，我用 C# 创建了一个小程序，用以下代码来检测按键：
protected override void OnKeyDown(KeyEventArgs e)
{
if (e.KeyCode == Keys.F12) MessageBox.Show("f12 pressed");
}
当表单聚焦且处于活动状态时，此方法可以正常工作。我花了很多时间寻找如何在最小化时将其设置为工作，我在这里找到了添加系统托盘图标的解决方案。我遵循了解决方案，但不再起作用了。
当我最小化它时，图标托盘出现并工作，但我没有检测到按键。
For my test I've created a little program in C# to detect key presses with this code:
protected override void OnKeyDown(KeyEventArgs e)
{
if (e.KeyCode == Keys.F12) MessageBox.Show("f12 pressed");
}
This works fine when the form is focused and active. I've spent many time to find how to set it for works when minimized, I found a solution here to add system tray icon. I followed solution but didn't work anymore.
When i minimize it, the icon tray appears and works, but i didn't detect key presses.
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您的表单仅在获得焦点时才会接收按键事件，要接收其他按键事件，您需要注册全局热键。
http://www.dreamincode.net/forums/topic/180436-global-热键/
Your form will only receive keypress events when it has focus, to receive other keypress events you would need to register a global hotkey.
http://www.dreamincode.net/forums/topic/180436-global-hotkeys/