C++ OpenGL Shaders errors - opengl

Question

#include <stdio.h>
#include <stdlib.h>
#include <string>
#include <fstream>
#include <GL\glew.h>
#include <GL\freeglut.h>
#include <GLFW\glfw3.h>
std::string LoadFileToString(const char* filepath)
{
std::string fileData;
std::ifstream stream(filepath, std::ios::in);
if (stream.is_open())
{
std::string line = "";
while (getline(stream, line))
{
fileData += "\n" + line;
}
stream.close();
}
return fileData;
}
GLuint LoadShaders(const char* vertShaderPath, const char* fragshaderPath)
{
GLuint vertShader = glCreateShader(GL_VERTEX_SHADER);
GLuint fragShader = glCreateShader(GL_FRAGMENT_SHADER);
std::string vertShaderSource = LoadFileToString(vertShaderPath);
std::string fragShaderSource = LoadFileToString(fragshaderPath);
const char* rawVertShaderSource = vertShaderSource.c_str();
const char* rawFragShaderSource = fragShaderSource.c_str();
glShaderSource(vertShader, 1, &rawVertShaderSource, NULL);
glShaderSource(fragShader, 1, &rawFragShaderSource, NULL);
glCompileShader(vertShader);
glCompileShader(fragShader);
GLuint program = glCreateProgram();
glAttachShader(program, vertShader);
glAttachShader(program, fragShader);
glLinkProgram(program);
return program;
}
int main()
{
if (glfwInit() == false)
{
fprintf(stderr, "GLWF dailed to initialise");
return -1;
}
//4 AA
glfwWindowHint(GLFW_SAMPLES, 4);
glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3);
glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 3);
glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_PROFILE);
GLFWwindow* window;
window = glfwCreateWindow(640, 480, "My OpenGL", NULL, NULL);
if (!window)
{
fprintf(stderr, "Window failed to create");
glfwTerminate();
return -1;
}
glfwMakeContextCurrent(window);
glewExperimental = true;
if (glewInit() != GLEW_OK)
{
fprintf(stderr, "GLEW failed to initialise");
glfwTerminate();
return -1;
}
GLuint vaoID;
glGenVertexArrays(1, &vaoID);
glBindVertexArray(vaoID);
static const GLfloat verts[] = {
-1.0f, -1.0f, 0.0f,
1.0f, -1.0f, 0.0f,
0.0f, 1.0f, 0.0f
};//end static
GLuint program = LoadShaders("shader.vertshader", "shader.fragshader");
GLuint VboID;
glGenBuffers(1, &VboID);
glBindBuffer(GL_ARRAY_BUFFER, VboID);
glBufferData(GL_ARRAY_BUFFER, sizeof(verts), verts, GL_STATIC_DRAW);
do{
glClear(GL_COLOR_BUFFER_BIT);
glEnableVertexAttribArray(0);
glBindBuffer(GL_ARRAY_BUFFER, VboID);
glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 0, (void*)0);
glUseProgram(program);
glDrawArrays(GL_TRIANGLES, 0, 3);
glDisableVertexAttribArray(0);
glfwSwapBuffers(window);
glfwPollEvents();
} while (glfwWindowShouldClose(window) == false);
return 0;
}
When I　run this program, I always get "Window failed to create" on the window, while I　should get a triangle I guess. could anyone help me check please?
and what is "'homework4.exe' (Win32): Loaded 'C:\Users\Wanhua\Desktop\Computer graphic\homework4\homework4\glew32.dll'. Module was built without symbols. " this means???
and that output shows below:
'homework4.exe' (Win32): Loaded 'C:\Users\Wanhua\Desktop\Computer graphic\homework4\Debug\homework4.exe'. Symbols loaded.
'homework4.exe' (Win32): Loaded 'C:\Windows\SysWOW64\ntdll.dll'. Symbols loaded.
'homework4.exe' (Win32): Loaded 'C:\Windows\SysWOW64\kernel32.dll'. Symbols loaded.
'homework4.exe' (Win32): Loaded 'C:\Windows\SysWOW64\KernelBase.dll'. Symbols loaded.
'homework4.exe' (Win32): Loaded 'C:\Users\Wanhua\Desktop\Computer graphic\homework4\homework4\glew32.dll'. Module was built without symbols.
'homework4.exe' (Win32): Loaded 'C:\Windows\SysWOW64\user32.dll'. Symbols loaded.
'homework4.exe' (Win32): Loaded 'C:\Windows\SysWOW64\gdi32.dll'. Symbols loaded.
'homework4.exe' (Win32): Loaded 'C:\Windows\SysWOW64\shell32.dll'. Symbols loaded.
'homework4.exe' (Win32): Loaded 'C:\Windows\SysWOW64\msvcp120d.dll'. Symbols loaded.
'homework4.exe' (Win32): Loaded 'C:\Windows\SysWOW64\opengl32.dll'. Symbols loaded.
'homework4.exe' (Win32): Loaded 'C:\Windows\SysWOW64\msvcr120d.dll'. Symbols loaded.
'homework4.exe' (Win32): Loaded 'C:\Windows\SysWOW64\msvcrt.dll'. Symbols loaded.
'homework4.exe' (Win32): Loaded 'C:\Windows\SysWOW64\combase.dll'. Symbols loaded.
'homework4.exe' (Win32): Loaded 'C:\Windows\SysWOW64\shlwapi.dll'. Symbols loaded.
'homework4.exe' (Win32): Loaded 'C:\Windows\SysWOW64\advapi32.dll'. Symbols loaded.
'homework4.exe' (Win32): Loaded 'C:\Windows\SysWOW64\glu32.dll'. Symbols loaded.
'homework4.exe' (Win32): Loaded 'C:\Windows\SysWOW64\ddraw.dll'. Symbols loaded.
'homework4.exe' (Win32): Loaded 'C:\Windows\SysWOW64\rpcrt4.dll'. Symbols loaded.
'homework4.exe' (Win32): Loaded 'C:\Windows\SysWOW64\sechost.dll'. Symbols loaded.
'homework4.exe' (Win32): Loaded 'C:\Windows\SysWOW64\dciman32.dll'. Symbols loaded.
'homework4.exe' (Win32): Loaded 'C:\Windows\SysWOW64\sspicli.dll'. Symbols loaded.
'homework4.exe' (Win32): Loaded 'C:\Windows\SysWOW64\cryptbase.dll'. Symbols loaded.
'homework4.exe' (Win32): Loaded 'C:\Windows\SysWOW64\bcryptprimitives.dll'. Symbols loaded.
'homework4.exe' (Win32): Loaded 'C:\Windows\SysWOW64\imm32.dll'. Symbols loaded.
'homework4.exe' (Win32): Loaded 'C:\Windows\SysWOW64\msctf.dll'. Cannot find or open the PDB file.
'homework4.exe' (Win32): Loaded 'C:\Windows\SysWOW64\uxtheme.dll'. Symbols loaded.
'homework4.exe' (Win32): Loaded 'C:\Windows\SysWOW64\winmm.dll'. Symbols loaded.
'homework4.exe' (Win32): Loaded 'C:\Windows\SysWOW64\winmmbase.dll'. Symbols loaded.
'homework4.exe' (Win32): Loaded 'C:\Windows\SysWOW64\cfgmgr32.dll'. Symbols loaded.
'homework4.exe' (Win32): Loaded 'C:\Windows\SysWOW64\devobj.dll'. Symbols loaded.
'homework4.exe' (Win32): Loaded 'C:\Windows\SysWOW64\dwmapi.dll'. Symbols loaded.
'homework4.exe' (Win32): Unloaded 'C:\Windows\SysWOW64\winmmbase.dll'
'homework4.exe' (Win32): Unloaded 'C:\Windows\SysWOW64\devobj.dll'
'homework4.exe' (Win32): Unloaded 'C:\Windows\SysWOW64\cfgmgr32.dll'
'homework4.exe' (Win32): Unloaded 'C:\Windows\SysWOW64\winmm.dll'
'homework4.exe' (Win32): Unloaded 'C:\Windows\SysWOW64\dwmapi.dll'
The program '[14652] homework4.exe' has exited with code -1 (0xffffffff).

Answer 1

This call looks invalid:
glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_PROFILE);
The first parameter is fine, but you're passing the same value for the second parameter. The second parameter specifies which profile you want to use, where the valid options are:
GLFW_OPENGL_COMPAT_PROFILE: compatibility profile
GLFW_OPENGL_CORE_PROFILE: core profile
So for using the core profile, the correct call is:
glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);