当窗口用户将焦点输入到输入区域时如何响应事件？

Question

I'm going to implementing an On Screen Keyboard for Window which requires the OSK app to show when an user enter an input area. For example, when a user open notepad.exe and start clicking on it, my OSK app (currently run in system tray) should be showed.

I have no idea how to catch those event (user click on notepad app) but I guess it relates to the Win32 things. Can anybody give me a hint for this ? Would be highly appreciated.

Thanks

Answer 1

You'll probably have to set a global hook , using eg SetWindowsHookEx() , in order to monitor the WM_SETFOCUS messages sent to all the edit controls in all the applications.

That's quite intrusive, and that won't be easy. Good luck.