using WndProc as a function parameter ?

  
bool InsiDer::idCreateWindow (char *Title,char *Class,int Width,int Height,unsigned int Style, HINSTANCE Hinstance,HWND Hwnd,WNDPROC WndProc)

{
  WNDCLASS Wc;

  Wc.cbClsExtra = 0;
  Wc.cbWndExtra = 0;
  Wc.hbrBackground = (HBRUSH) GetStockObject (BLACK_BRUSH);
  Wc.hCursor = LoadCursor (NULL,IDC_ARROW);
  Wc.hIcon = LoadIcon (NULL,IDI_APPLICATION);
  Wc.hInstance = Hinstance;
  Wc.lpfnWndProc = WndProc; // THIS IS WHAT IS NOT RIGHT ! :D

  Wc.lpszClassName = Class;
  Wc.lpszMenuName = NULL;
  Wc.style = CS_OWNDC | CS_VREDRAW | CS_HREDRAW;

 if (!RegisterClass (&Wc))
 {
   MessageBox (NULL,"Window class registration     failed !","InsiDer",MB_OK|MB_ICONEXCLAMATION);
   return false;
 }

 Hwnd = CreateWindow (Class,Title,Style,CW_USEDEFAULT,CW_USEDEFAULT,Width,Height,NULL,NULL,Hinstance,NULL);

  return true;
  }

  

      

#include <windows.h>

#include "InsiDer.h"

LRESULT CALLBACK WndProc ( ...);

int WINAPI WinMain ( ... )
{
  MSG Msg;
  InsiDer *Wrapper;

  Wrapper->idCreateWindow ( ... );
  ShowWindow ( ...);

  //Message Looping 


  ....

  return Msg.wParam;
}

LRESULT CALLBACK WndProc ( ...)
{
 ...
}

      

  
#ifndef _InsiDer_H

#define _InsiDer_H

#pragma comment (lib,"glu32.lib")

#pragma comment (lib,"opengl32.lib")

#include <windows.h> 

#include <gl/gl.h>

#include <gl/glu.h> 

#define DE _declspec (dllexport)

namespace InsiDer_Engine
{
	class DE InsiDer
	{
		public:
			/*-------------------------------------------------------------*\
			|idCreateWindow - Wraper to an easy window creation			   |				
			\*-------------------------------------------------------------*/
			static bool idCreateWindow (char *Title,char *Class,int Width,int Height,unsigned int Style,
			                            HINSTANCE Hinstance,HWND Hwnd,WNDPROC WndProc);
			/*-------------------------------------------------------------*\
			|idEnableRenderer - Enables Opengl to a window				   |				
			|idDisableRenderer - Disables Opengl to a window			   |		
			|idChangeResolution - Changes screen resolution				   |
			|idResizeSceneModel - Resize a scene using perspective         |
			|idResizeSceneOrtho - Resize a scene using orthographic        |
			\*-------------------------------------------------------------*/
			static bool idEnableRenderer   (HWND &Hwnd,HDC &Hdc,HGLRC &Hrc,int Colors,int Depth);
			static bool idDisableRenderer  (HWND Hwnd,HDC Hdc,HGLRC Hrc);
			static bool idChangeResolution (int Width,int Height,int Depth);
			
			static void idResizeSceneModel (int Width,int Height,float Start,float End,bool Cinema);
			static void idResizeSceneOrtho (int Left,int Right,int Top,int Bottom,bool Cinema);

			

	};
	
}

#endif
  

  
include "InsiDer.h" 

namespace InsiDer_Engine
{
	bool InsiDer::idCreateWindow (char *Title,char *Class,int Width,int Height,unsigned int Style,
			                     HINSTANCE Hinstance,HWND Hwnd,WNDPROC WndProc)
	{
		WNDCLASS Wc;

		Wc.cbClsExtra = 0;
		Wc.cbWndExtra = 0;
		Wc.hbrBackground = (HBRUSH) GetStockObject (BLACK_BRUSH);
		Wc.hCursor = LoadCursor (NULL,IDC_ARROW);
		Wc.hIcon = LoadIcon (NULL,IDI_APPLICATION);
		Wc.hInstance = Hinstance;
		Wc.lpfnWndProc = WndProc;
		Wc.lpszClassName = Class;
		Wc.lpszMenuName = NULL;
		Wc.style = CS_OWNDC | CS_VREDRAW | CS_HREDRAW;

		if (!RegisterClass (&Wc))
		{
			MessageBox (NULL,"Window class registration failed !","InsiDer",MB_OK|MB_ICONEXCLAMATION);
			return false;
		}

		Hwnd = CreateWindow (Class,Title,Style,CW_USEDEFAULT,CW_USEDEFAULT,
								   Width,Height,NULL,NULL,Hinstance,NULL);

		return true;
	}
}