Detect input focus on any external window

[Champak]

I searched through windows messages and couldn't come up with a solution, or combination of solutions. What I want to do is click on a text box/combo box of any external app and return the control id and window of the app that was clicked. I found $WM_NCACTIVATE, but that only sends a message when going to/from my app; I need something that will register something when ANY app is clicked on from any other app, and then send me the control id if I click in one. Is this possible?

[jguinch]

Maybe with _WinAPI_SetWindowsHookEx ?

[junkew]

see in examples section the iuiautomation thread which shows some event cachin logic

[Champak]

Thanks, ill check them out.