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5.8

SetWindowsHookEx keep crashing the program that I'm hooking.

Asked by redhat in Windows Programming

Tags: setwindowshookex

I have no idea why this happens. Perhaps my codes is not safe...
The following is the hooking part of my hooker program..

In my MainProc:

case WM_CREATE:
if(hAver == NULL)
{
  hAver = FindWindow( "AfxFrameOrView42s", "Aver Remote Control");
}
 if(hAver == NULL)
{
  MessageBox(NULL, "Aver Remote is not up or not detected", "Error",   MB_OK);
}
             
dwThreadID = GetWindowThreadProcessId( hAver, NULL );
       
hook = SetWindowsHookEx( WH_CALLWNDPROC ,
                                 (HOOKPROC)CallWndProc,       
                                 hInst,      
                                 dwThreadID       
                              );
if(hook==NULL)
{
   MessageBox(NULL, "Something is wrong with SetWindowsHookEx",    "Error", MB_OK);
}
break;


And this in the CallBack Procedure of the hook...
LRESULT CALLBACK CallWndProc( int nCode, WPARAM wParam,
LPARAM lParam )
{      
    if (nCode==HC_ACTION)
    {
       if(((CWPSTRUCT *)lParam)->message==WM_GETTEXT)
       {
          MessageBox(NULL, "WM_GETTEXT is sent", "Alright Already", MB_OK);        }

    return CallNextHookEx(hook, nCode, wParam, lParam);
}

I got the message box to appear , then the program that I'm hooking and my program freezes. At least I need to know how I can check where is the problem. By the way, if coincidentally, anyone who is using AVerMedia TVPhone, I'm actually trying to hook the remote control messages. I have seen someone done it to control winamp, I'm trying to do the same but to control another program. Please excuse my unprofessional codes.
[+][-]03/30/00 02:11 PM, ID: 2671031

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About this solution

Zone: Windows Programming
Tags: setwindowshookex
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Solution Provided By: NickRepin
Participating Experts: 4
Solution Grade: A
 
 
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