Hi all, I try use glew. This my code

if (glewInit() == GLEW_NO_ERROR)
    {
      GLuint vertexbuffer;
      glGenBuffers(1, &vertexbuffer);
    }

and I get an error on glGenBuffers An unhandled exception of type 'System.AccessViolationException' occurred in ManagedLib.dll, in compiled my dll c++/cli

I believe you still have to create a OpenGL Context before using OpenGL Calls like that.

https://open.gl/context

I create context on event form_load

GLManagedWrapper::GLManagedWrapper(INT_PTR hWnd)
	{

		if (!glewInit()) return;
		glewExperimental = GL_TRUE;


		m_Hwnd = (HWND)hWnd;
		if (!m_Hwnd) return;

		int m_Width, m_Height;
		LPRECT rect = (LPRECT)malloc(sizeof(RECT));
		if (GetWindowRect(m_Hwnd, rect))
		{
			m_Width = rect->right - rect->left;
			m_Height = rect->bottom - rect->top;
		}
		else return;

		free(rect);

		m_Hdc = GetDC(m_Hwnd);

		if (m_Hdc)
		{
			GLSetPixelFormat(m_Hdc);
			ReSizeGLScene(m_Width, m_Height);
			InitGL();
		}
	}

I try minimal example and have error

#include "TestGlew.h"

using namespace TestTest;

void Test1::Test()
{
	glewExperimental = GL_TRUE;
	glewInit();
	GLuint vertexBuffer;
	glGenBuffers(1, &vertexBuffer);
	printf("%u\n", vertexBuffer);
}

and C# call dll

var t = new Test1();
            t.Test();

As you are using C# i assume your OS is Windows?

I had a similary error once, where everything worked fine until i tried to create the first buffer in OpenGL.

Unfortunately i don't remember the excact solution an have currently no acces to my code, but i believe it was some wrong header/header order.

Yes, Windows 7

#define GLEW_STATIC
#include <glew.h>
#include <stdio.h>

namespace TestTest
{
	public ref class Test1
	{
	public:
		void Test();
	};
};

and include glew32.lib

Shouldn't it be glew32s.lib if you define GLEW_STATIC

I replaced to glew32s.lib, don't help

I've found some other code which words for me on windows: IIRC the crash was somewhere deep in the driver.

I included my headers the following order:

#include <windows.h>
#include <glew.h>
#include <wglew.h>

this is how i initialized glew and OpenGL

	m_hDC = GetDC(m_hWnd);
	m_hGlrc = wglCreateContext(m_hDC);
	wglMakeCurrent(m_hDC, m_hGlrc);
	glewInit();
        wglMakeCurrent(m_hDC, m_hGlrc);

Hope you can find there what you are missing