🚀 go-pugleaf

"nicolasr" <nicolasrATSIGNgmx.net> wrote in message
news:3e834e27$1@newsgroups.borland.com...

> I tried WH_GETMESSAGE together with PostMessage()
> as you suggested and this works well now.

Just be careful with PostMessage().  Keep in mind that it returns
immediately, it does not wait for the message to actually be processed.  So
if you're passing pointers, especially local ones as your earlier samples
with COPYDATASTRUCT were doing, and your code exits and frees the data
before the receiver gets a chance to process the message, the receiver is
going to blow up from accessing invalid memory.

> The hook callback is called for other messages (redraw
> etc.)

Those are posted to the message queue, thus the WH_GETMESSAGE hook would
pick them up.

> but never for my SendMessage().

Did you call SetWindowsHookEx() a second time to register the WH_CALLWNDPROC
hook as well?

> Which window proc is actually hooked, the main form,
> the application window?

All of the procedures for all of the windows associated with the thread ID
you specified to SetWindowsHookEx().


Gambit