Is CALLBACK WndProc() an interrupt driven function.

[Perman]

After been working for many years with RTOS for all different kind of controllers (8bit - 32bit) I was wondering of the callback handler in Win32 GUI is interrupt driven. So when any i/o, timers or function calls like Updatewindow() are called it actually generate an interrupt that call the vector of the callback function. Or does it work completely different? Anybody know. Common interest to get an understanding of the code flow. Thanks.

[kbw]

It is not interrupt driven.

Callbacks are pointers to functions that are called in some processing loop (like EnumWindows).

Messasges are sent as and when Windows get around to it.

[Perman]

Thanks kbw. I was just wondering because in the very low level part of it, it must come down to the windows OS and is an overlay of that. Who know what will happen if the Win32 GUI took over the windows os. Ha Ha. Thank. Just a thought.