I'm using Visual Studio 2013 and am new to C++. I installed GLEW and freeglut. I try to build my file "main.c", and I receive this:
1>------ Build started: Project: testGlut1, Configuration: Debug Win32 ------
1> main.c
1>main.obj : error LNK2019: unresolved external symbol __imp__glewInit@0 referenced function _Initialize
1>main.obj : error LNK2019: unresolved external symbol __imp__glewGetErrorString@4 referenced in function _Initialize
1>C:\Users\User\documents\visual studio 2013\Projects\testGlut1\Debug\testGlut1.exe : fatal error LNK1120: 2 unresolved externals
========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped ==========
I read through a similar issue, however the solution didn't work for me, in fact, nothing changed. Also, I only have 2 unresolved externals whereas the aforementioned issue showed 16 unresolved externals. Why? Why are those two errors isolated as such?
The source code for my program:
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <GL/glew.h>
#include <GL/freeglut.h>
#define WINDOW_TITLE_PREFIX "Chapter 1"
int CurrentWidth = 800,
CurrentHeight = 600,
WindowHandle = 0;
unsigned FrameCount = 0;
void Initialize(int, char*[]);
void InitWindow(int, char*[]);
void ResizeFunction(int, int);
void RenderFunction(void);
void TimerFunction(int);
void IdleFunction(void);
int main(int argc, char* argv[])
{
Initialize(argc, argv);
glutMainLoop();
exit(EXIT_SUCCESS);
}
void Initialize(int argc, char* argv[])
{
GLenum GlewInitResult;
InitWindow(argc, argv);
GlewInitResult = glewInit();
if (GLEW_OK != GlewInitResult) {
fprintf(
stderr,
"ERROR: %s\n",
glewGetErrorString(GlewInitResult)
);
exit(EXIT_FAILURE);
}
fprintf(
stdout,
"INFO: OpenGL Version: %s\n",
glGetString(GL_VERSION)
);
glClearColor(0.0f, 0.0f, 0.0f, 0.0f);
}
void InitWindow(int argc, char* argv[])
{
glutInit(&argc, argv);
glutInitContextVersion(4, 0);
glutInitContextFlags(GLUT_FORWARD_COMPATIBLE);
glutInitContextProfile(GLUT_CORE_PROFILE);
glutSetOption(
GLUT_ACTION_ON_WINDOW_CLOSE,
GLUT_ACTION_GLUTMAINLOOP_RETURNS
);
glutInitWindowSize(CurrentWidth, CurrentHeight);
glutInitDisplayMode(GLUT_DEPTH | GLUT_DOUBLE | GLUT_RGBA);
WindowHandle = glutCreateWindow(WINDOW_TITLE_PREFIX);
if (WindowHandle < 1) {
fprintf(
stderr,
"ERROR: Could not create a new rendering window.\n"
);
exit(EXIT_FAILURE);
}
glutReshapeFunc(ResizeFunction);
glutDisplayFunc(RenderFunction);
glutIdleFunc(IdleFunction);
glutTimerFunc(0, TimerFunction, 0);
}
void ResizeFunction(int Width, int Height)
{
CurrentWidth = Width;
CurrentHeight = Height;
glViewport(0, 0, CurrentWidth, CurrentHeight);
}
void RenderFunction(void)
{
++FrameCount;
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glutSwapBuffers();
glutPostRedisplay();
}
void IdleFunction(void)
{
glutPostRedisplay();
}
void TimerFunction(int Value)
{
if (0 != Value) {
char* TempString = (char*)
malloc(512 + strlen(WINDOW_TITLE_PREFIX));
sprintf(
TempString,
"%s: %d Frames Per Second @ %d x %d",
WINDOW_TITLE_PREFIX,
FrameCount * 4,
CurrentWidth,
CurrentHeight
);
glutSetWindowTitle(TempString);
free(TempString);
}
FrameCount = 0;
glutTimerFunc(250, TimerFunction, 1);
}
Here are my additional dependencies:
Here is the Debug folder in MyDocuments:
There were simply incompatibilities between the OS versions of the linked files. I thought that the process was using SysWOW64 to search for the DLL files of GLUT and GLEW since my OS is Windows 64-bit. Anyway, I used the tool, Dependecy Walker 2.2, to track an previously created .exe file and learned that my OS was searching C:\Windows\System32 for the DLL files. That changed everything, annoyingly. Out of frustration in having searched for answers for over a day and a half, I went into C:\Program Files (x86)\Windows Kits\8.1\Lib\winv6.3\um\x86 and swapped the glew32.lib (64-bit) for glew32.lib (32-bit), and voila, I can run my program without any errors. Since I am not an expert, or even practiced in C programming, I can only say that this is a temporary solution for my problem. I'm not sure why the program searches through C:\Windows\System32 rather than C:\Windows\SysWOW64. But, I hope that this solution helps those whom have exprienced a mysterious linker error messages when trying to use GLEW, GLUT, and Microsoft Visual Studio.