问题
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.
回答1:
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/
来源：https://stackoverflow.com/questions/8734453/detect-keypression-when-minimized-and-trayicon