PostMessage seems not working

[henry1999sg]

I want to change SendMessage to PostMessage in a C++ application. but I never receive a message by using the PostMessage. below is the code.

1.create a thread
  HWND mainWnd =((CWnd *)g_pCalltaker_form)->GetSafeHwnd();
  HANDLE hc = (HANDLE)_beginthread( PostAcceptEvent, 0, mainWnd );

2.postMessage
void PostAcceptEvent( void *dummy )
{
  HWND mainWnd =(HWND)dummy;
  long state = 3;
  ::PostMessage(mainWnd,WM_POST_BUTTONSATE,state,0);
}

3. SetWindowsHookEx (The currentThread is the main window thread)
g_hookHandle = SetWindowsHookEx(WH_CALLWNDPROC, CallWndProc, NULL, GetCurrentThreadId());

4.CallWndProc
LRESULT CALLBACK CallWndProc(int ncode, WPARAM wParam, LPARAM lParam)
{
  if (ncode != HC_ACTION )
  {
    return CallNextHookEx(g_hookHandle, ncode, wParam, lParam);
  }
  
  AFX_MANAGE_STATE(AfxGetStaticModuleState());
  CWPSTRUCT *Struct = (CWPSTRUCT *)lParam;
  if (WM_POST_BUTTONSATE==Struct->message )
  {
    log.debug() << "--WM_POST_BUTTONSATE,wParam="<<(long)Struct- >wParam<<",lParam="<<(long)Struct->lParam<<"\n";
  }
}

But it works with SendMessage().. Any idea, gurus ?

thanks in advance.!

[kbw]

You many threading issues. I'm not sure what the context is. You may need PostThreadMessage