C / C++ / MFC

Michael ZY wrote:

extern "C" _declspec(dllexport) LRESULT WINAPI MouseProc(int nCode,WPARAM wParam,LPARAM lParam)

extern "C" _declspec(dllexport) LRESULT WINAPI MouseProc(int nCode,WPARAM wParam,LPARAM lParam){   
   if(nCode < 0)      
      return CallNextHookEx(g_hHook,nCode,wParam,lParam);      
   if(nCode == HC_ACTION)   
   {      
      switch(wParam)      
      {         
         case WM_MOUSEWHEEL:            
            short zDelta = (short)HIWORD(wParam);// The 'zDelta' always seem to be zero
            break;
         default:            
            return CallNextHookEx(g_hHook,nCode,wParam,lParam);      
      }   
   }
   return CallNextHookEx(g_hHook,nCode,wParam,lParam);
}

Yanshof wrote:

but my compiler repeat the message "undeclared identifier".

1. Avoid erasing the background prior to redrawing - handle WM_ERASEBKGND
2. Avoid changing the window region when the size hasn't changed - in WM_SIZE, store a copy of the current size, and when it's called again, check to make sure the size has actually changed before setting a new region.
3. Check the speed of your drawing code. Temporarily replace it with something simple (but not too simple), like a pattern fill. If the flicker disappears, you probably need to work on optimizing your code.