Original Post
I am suffering with these errors. Can anyone suggest anything.The errors and code will be displayed below
Thanks
Window.obj : error LNK2001: unresolved external symbol __imp__wglMakeCurrent@8
Window.obj : error LNK2001: unresolved external symbol __imp__wglCreateContext@4
Window.obj : error LNK2001: unresolved external symbol __imp__wglDeleteContext@4
Window.obj : error LNK2001: unresolved external symbol _gluPerspective@32
Window.obj : error LNK2001: unresolved external symbol __imp__glLoadIdentity@0
Window.obj : error LNK2001: unresolved external symbol __imp__glMatrixMode@4
Window.obj : error LNK2001: unresolved external symbol __imp__glViewport@16
Window.obj : error LNK2001: unresolved external symbol "public: __thiscall Window::~Window(void)" (??1Window@@QAE@XZ)
Debug/Project.exe : fatal error LNK1120: 8 unresolved externals
Error executing link.exe.
/////////////////////////////////////////////////////////////////
Window.h
#ifndef _WINDOW_H_
#define _WINDOW_H_
//HEADER FILE THAT DEFINES A CLASS FOR THE WINDOW
#define WIN32_LEAN_AND_MEAN //trim extra fat from windows
//INCLUDES///////////////////////////////////////////////////////////////////
#include <windows.h> //standard windows app include
#include <gl/gl.h> //standard OpenGL include
#include <gl/glu.h> //OpenGL utilities
#include <gl/glaux.h> //OpenGL auxillary functions
/////////////////////////////////////////////////////////////////////////////
//CLASS DECLERATION//////////////////////////////////////////////////////////
class Window
{
private:
HWND hwnd; //window handle
HGLRC hRC; //rendering context
HDC hDC; //device context
//The Windows Procedure event handler
friend LRESULT CALLBACK WndProc(HWND hwnd,UINT message,WPARAM wParam,LPARAM lParam);
//function to set up the pixel format for the device context
void SetupPixelFormat();
bool Create(); //WM_CREATE
void Destroy(); //WM_DESTROY
void Size(); //WM_SIZE
public:
int width; //width of window
int height; //height of window
bool fullscreen; //Fullscreen??
int bits; //no of bits
//Default Constructor////////////////////////////////////////////////////
Window(){}
//Constructor////////////////////////////////////////////////////////////
Window(const char* windowName,bool fscreen,int w,int h,int b);
//Destructor/////////////////////////////////////////////////////////////
~Window();
//Register Window
//Must be used before the class is used as it is static
static bool RegisterWindow(HINSTANCE hInstance);
};
#endif
///////////////////////////////////////////////////////////////
Window.cpp
#include "Window.h"
/////////////////FUNCTIONS/////////////////////////////////////////////////////////////////
void Window::SetupPixelFormat()
{
int pixelFormat; //the pixel format index
static PIXELFORMATDESCRIPTOR pfd = {
sizeof(PIXELFORMATDESCRIPTOR), //size of structure
1, //version always set to one
PFD_DRAW_TO_WINDOW|PFD_SUPPORT_OPENGL|PFD_DOUBLEBUFFER, //support window,opengl and double buffering
PFD_TYPE_RGBA, //RGBA colour mode
32, //32 bit colour mode
0,0,0,0,0,0, //colour bits not used
0, //no alpha buffer
0, //ignore shift bit
0, //no acclumulation buffer
0,0,0,0, //ignore accumulation bits
16, //16-bit depth buffer
0, //no stencil buffer
0, //no auxillary buffer
PFD_MAIN_PLANE, //main drawing plane
0, //reserved
0,0,0}; //ignore layers mask
//choose best matching pixel format
pixelFormat = ChoosePixelFormat(hDC,&pfd);
//set pixel format to device context
SetPixelFormat(hDC,pixelFormat,&pfd);
}
//Creates the window
bool Window::Create()
{
hDC = GetDC(hwnd); //get windows current device context
SetupPixelFormat(); //call the pixel format setup function
//create rendering context and make it current
hRC = wglCreateContext(hDC);
wglMakeCurrent(hDC,hRC);
return true; //on creation of window retun true
}
//Destroy the window
void Window::Destroy()
{
if(hRC)
{
//deselect rendering context and delete it
wglMakeCurrent(hDC,NULL);
wglDeleteContext(hRC);
}
SetWindowLong(hwnd, GWL_USERDATA, (LONG)NULL);
DestroyWindow(hwnd);
}
//resizing of the window
void Window::Size()
{
if(height ==0) //dont want to divide by zero
{
height =1;
}
//reset the viewport to the new dimensions
glViewport(0,0,width,height);
glMatrixMode(GL_PROJECTION); //set the projection matrix
glLoadIdentity(); //reset projection matrix
//calculate aspect ratio of window
gluPerspective(45.0f,(float)width/(float)height,1.0f,1000.0f);
glMatrixMode(GL_MODELVIEW); //set matrix mode to modelview
glLoadIdentity(); //reset modelview matrix
}
LRESULT CALLBACK WndProc(HWND hwnd,UINT message,WPARAM wParam,LPARAM lParam)
{
Window OpenGLwindow;
switch(message)
{
case WM_CREATE:
{
OpenGLwindow.hwnd = hwnd;
//create the window
OpenGLwindow.Create();
}break;
case WM_QUIT:
case WM_CLOSE:
{
//close the window
OpenGLwindow.Destroy();
PostQuitMessage(0);
return 0;
}break;
case WM_DESTROY:
{
OpenGLwindow.Destroy();
PostQuitMessage(0);
return 0;
}break;
case WM_SIZE:
{
OpenGLwindow.height = HIWORD(lParam); //retrieve width and height
OpenGLwindow.width = LOWORD(lParam);
OpenGLwindow.Size();
return 0;
}break;
default :
break;
}
return (DefWindowProc(hwnd,message,wParam,lParam));
}
bool Window::RegisterWindow(HINSTANCE hInstance)
{
WNDCLASSEX windowClass; //the window class
//fill out the window class structure
windowClass.cbSize = sizeof(WNDCLASSEX);
windowClass.style = CS_HREDRAW|CS_VREDRAW;
windowClass.lpfnWndProc = WndProc;
windowClass.cbClsExtra = 0;
windowClass.cbWndExtra = 0;
windowClass.hInstance = hInstance;
windowClass.hIcon = LoadIcon(NULL,IDI_APPLICATION);
windowClass.hCursor = LoadCursor(NULL,IDC_ARROW);
windowClass.hbrBackground = NULL;
windowClass.lpszMenuName = NULL;
windowClass.lpszClassName = "FatHead Engine";
windowClass.hIconSm = LoadIcon(NULL,IDI_WINLOGO);
//register the class
if(!RegisterClassEx(&windowClass))
return false;
return true;
}
/////////////////////////////////////////////////////////////////
WinMain.cpp
#include <windows.h>
#include "Window.h"
int WINAPI WinMain(HINSTANCE hInstance,HINSTANCE hPrevInstance,LPSTR lpCmdLine,
int nShowCmd)
{
HWND hwnd; //window handle
MSG msg; //message
bool done; //is the application finished
if(!Window::RegisterWindow(hInstance))
{
MessageBox(NULL,"Cannot register window class","Error",MB_OK);
return -1;
}
hwnd = CreateWindowEx(NULL, //extended style
"Fathead Engine", //class name
"Fathead Engine", //application name
WS_OVERLAPPEDWINDOW|WS_VISIBLE|WS_SYSMENU|WS_CLIPCHILDREN|WS_CLIPSIBLINGS,
100,100, //x,y coordinate
400,400, //width,height
NULL,
NULL,
hInstance, //application instance
NULL);
//check if window creation failed hwnd would equal NULL
if(!hwnd)
return 0;
ShowWindow(hwnd,SW_SHOW); //display the window
UpdateWindow(hwnd); //update the window
done = false;
//Main message loop
while(!done)
{
PeekMessage(&msg,hwnd,NULL,NULL,PM_REMOVE);
if(msg.message == WM_QUIT)
{
done = true;
}
else
{
TranslateMessage(&msg); //send event to queue
DispatchMessage(&msg);
}
}
return msg.wParam;
}
