2 replies to this topic

[Stasonix]

how can I check if Ctrl is KeyDown, do some function, but not only in my form, but whole OS? I see a many of examples, but there is only for all keys, I need only for Ctrl.

[WingedPanther]

In that case, you're going to have to use some system hooks. There should be some Windows API functions for this. Torry's Delphi Pages

[LuthfiHakim]

If you okay with polling approach, then you can use windows api GetKeyboardState or GetKeyState in a timer to see if Ctrl is down. For interrupt approach, you need to install system-wide hook to intercept keyboard messages. This hook notifies your program when it detects WM_KEYDOWN with Ctrl key specified.

Visit my tutorial (http://forum.codecal...elphi-code.html) to start learning about keyboard hook. However in your case, function KBHookHandler should not drop all messages, but to look for WM_KEYDOWN with Ctrl key specified messages and notifies (either by postmessage or sendmessage or through named piped) your program.