Getting GLFW together with glad to work on windows [duplicate] - c++

Question

I'm having a problem where the following lines of code always print "Failed to initialize glad" and then exits the program:
if (!gladLoadGLLoader((GLADloadproc)glfwGetProcAddress))
{
std::cout << "Failed to initialize GLAD" << std::endl;
return -1;
}
I have been using https://learnopengl.com/ as a guide and have been following the steps in the getting started section. I am writing this using Visual Studio, I have moved the glad.c source file into the build to get this working and added the header files to the same location where I specified the glfw header would be, but I haven't been able to find anyone with a problem similar to mine.
Commenting out return -1; line results in an access violation exception, so it is definitely here that the program is having trouble.
Here is the entire program in case there is something else I am missing:
#include "stdafx.h"
#include <GLFW/glfw3.h>
#include <glad/glad.h>
#include <iostream>
using namespace std;
void init_glfw();
void framebuffer_size_callback(GLFWwindow*, int, int);
int main(int argc, char **argv)
{
init_glfw();
GLFWwindow* window = glfwCreateWindow(800, 600, "Lab3", NULL, NULL);
if (window == NULL)
{
cout << "Failed to create GLFW window" << endl;
glfwTerminate();
return -1;
}
if (!gladLoadGLLoader((GLADloadproc)glfwGetProcAddress))
{
std::cout << "Failed to initialize GLAD" << std::endl;
return -1;
}
glViewport(0, 0, 800, 600);
glfwSetFramebufferSizeCallback(window, framebuffer_size_callback);
while (!glfwWindowShouldClose(window))
{
glfwSwapBuffers(window);
glfwPollEvents();
}
glfwTerminate();
return 0;
}
void init_glfw()
{
glfwInit();
glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3);
glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 3);
glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);
}
void framebuffer_size_callback(GLFWwindow* window, int width, int height)
{
glViewport(0, 0, width, height);
}

Answer 1

You never made your GL context current via glfwMakeContextCurrent(). Unlike other GL windowing frameworks GLFW doesn't leave the GL context current when glfwCreateWindow() succeeds.
Call glfwMakeContextCurrent() after glfwCreateWindow() succeeds:
GLFWwindow* window = glfwCreateWindow(800, 600, "Lab3", NULL, NULL);
if (window == NULL)
{
cout << "Failed to create GLFW window" << endl;
glfwTerminate();
return -1;
}
glfwMakeContextCurrent( window );
if (!gladLoadGLLoader((GLADloadproc)glfwGetProcAddress))
{
std::cout << "Failed to initialize GLAD" << std::endl;
return -1;
}