Windows Hook WNDPROC

Hi and sorry for my bad english,
i need to Hook a single form of a process (.exe) and i need to get all windows messages.

I've tyred to wirte a function so that:

    if FHWND <> 0 then begin
      LPID := GetWindowPID(FHWND);
      LProcess := OpenProcess(PROCESS_CREATE_THREAD +
      if LPID <> 0 then begin
        KBHook := SetWindowsHookEx(WH_CALLWNDPROC, @HookProc, LProcess, FHWND);

but my HookProc don't receive any message.
I must write a procedure to get the message like Spy++ on a specified form (Handle).

Thank 2 all
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carmas123Author Commented:
Hi and thanks very much for your solution,
but this solve my problem partialy.

I've edited the sample for me, but i've another problem now.
I want to intercept the message like WM_ACTIVATE or other like WM_USER
for only one form in a process, but your sample attach the wndproc to
a threadID and i receive all the message from all form in this thread.

I attach my sample.
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