Can't include

Question

I\'m using Visual Studio 2010. I\'m trying to write simple Camera class in OpenGL. I need to include gl/gl.h in Camera.h
gl/gl.h is already included in main.cpp and Camera.h

Answer 1

Edit: Obviously Colin Hebert solved the problem, but as a general tip I`d like to say:

In Camera.h write

#ifndef _CAMERA_H
#define _CAMERA_H

above all other includes. And include all header files needed in your .cpp file in your .h file.

At least that`s what I think is best practice.

Answer 2

Just do an include of windows.h first.

#include <windows.h>

As it's said in the OpenGL FAQ :

Also, note that you'll need to put an #include <windows.h> statement before the #include<GL/gl.h>. Microsoft requires system DLLs to use a specific calling convention that isn't the default calling convention for most Win32 C compilers, so they've annotated the OpenGL calls in gl.h with some macros that expand to nonstandard C syntax. This causes Microsoft's C compilers to use the system calling convention. One of the include files included by windows.h defines the macros.

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Resources :

• social.msdn.microsoft.com - OpenGL problems
• OpenGL FAQ - Why am I getting compile, link, and runtime errors?