Why does glGetString(GL_VERSION) return null / zero instead of the OpenGL version?

Question

I\'m on Linux Mint 13 XFCE. My problem is that when I run in terminal the command:

glxinfo | grep \"OpenGL version\"

I get the following o

Answer 1

glutInit() doesn't create a GL context or make one current. You need a current GL context for glewInit() and glGetString() to work.

Try this:

#include 
#include 
#include 

int main(int argc, char **argv)
{
    glutInit(&argc, argv);
    glutCreateWindow("GLUT");

    glewInit();
    printf("OpenGL version supported by this platform (%s): \n", glGetString(GL_VERSION));
}