glCreateProgram访问冲突执行位置0x00000000

Question

I have initialized GLFW and i can call other gl functions. It is possible to draw faces using the OpenGL pipeline. It, however gives me this error when executing glCreateProgram() .

Error:

Exception thrown at 0x00000000 in Voxel.exe: 0xC0000005: Access violation executing location 0x00000000.

Simplified code:

void error_callback(int error, const char* description)
{
    cerr << description << endl;
}
[...]
if (!glfwInit())
    {
        cout << "Failed to create GLFW3 / OpenGL context";
        system("PAUSE");
        exit(EXIT_FAILURE);
    }
    else
        cout << "GLFW3 initialized!" << endl;

    glfwSetErrorCallback(error_callback);

    glFrontFace(GL_CW);
    glCullFace(GL_BACK);
    glEnable(GL_CULL_FACE);
    glEnable(GL_DEPTH_TEST);
width = 600;
    height = 600;
    this->window = glfwCreateWindow(width, height, "voxel", NULL, NULL);
    glfwSetWindowSize(this->window, width, height);
    glfwGetFramebufferSize(window, &width, &height);
    glViewport(0, 0, width, height);
    if (!this->window)
    {
        glfwTerminate();
        exit(EXIT_FAILURE);
    }
    glfwMakeContextCurrent(this->window);
    glfwSwapInterval(0);

    cout << "OpenGL version: " << glGetString(GL_VERSION) << endl;
GLuint program = glCreateProgram();
[...]

I do not see, why this is happening.

Answer 1

GLFW doesn't load extensions and modern functionality for you. Hence glCreateProgram is uninitialized.

You need an actual extension loader. Also you have to check that glCreateProgram et al. are actually supported by your target system.