about grobal message hook (WH_CALLWNDPROC) (illegal operation)

From: Qzg=FCr=20TU=D0RUL?= (oztugrul_at_hacettepe.edu.tr)
Date: 12/31/03 

Date: Wed, 31 Dec 2003 15:14:13 +0200

hi everybody,

i want to capture all windows messages so i wrote a message hook program
to run my function in my dll ... the problem is when i click the button
windows says "illegal operation" for every programs in windows ...
actually, i guess i know the reason ... in my function (it's in my dll),
i'm tryin' to write all messages to a textfile ... i think this causes
that errors (illegal operation) ... anyway here is my codes ... please
tell me how can i catch all windows' messages ? (like WinSight)

the function in my dll :

function GlobalMessageHook(code: integer; wParam: word; lParam:
longword): longword; stdcall;
begin

    if code<0 then begin

GlobalMessageHook:=CallNextHookEx(CurrentHook,code,wParam,lparam);
       Exit;
    end;

    with PMsg(lParam)^ do begin
            assignfile(CurFile,'log.txt');
            if fileexists('log.txt')=false then rewrite(CurFile) else
reset(CurFile);
            writeLn(CurFile, message, hwnd, lparam, wparam);
            closefile(CurFile);
    end;
    CallNextHookEx(CurrentHook,code,wParam,lparam);
    GlobalMessageHook:=0;
    Exit;
end;

============================================
Özgür TUĞRUL

Application & System Programmer
Ass. Database & System Adm.
Statistician & Research Ass.

Hacettepe University Office of the Registrar
Data Processing Department - System Room

oztugrul@hacettepe.edu.tr
http://yunus.hacettepe.edu.tr/~oztugrul/
============================================

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