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zee
01-03-2006, 03:20 PM
I do not know what the problem is here, it is simple sample code from the tutorial website in the openGL site.



//
// GLSAMPLE.CPP
// by Blaine Hodge
//

// Includes

#include <windows.h>
#include <gl/gl.h>

// Function Declarations

LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam);
void EnableOpenGL(HWND hWnd, HDC * hDC, HGLRC * hRC);
void DisableOpenGL(HWND hWnd, HDC hDC, HGLRC hRC);

// WinMain

int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance,
LPSTR lpCmdLine, int iCmdShow)
{
WNDCLASS wc;
HWND hWnd;
HDC hDC;
HGLRC hRC;
MSG msg;
BOOL quit = FALSE;
float theta = 0.0f;

// register window class
wc.style = CS_OWNDC;
wc.lpfnWndProc = WndProc;
wc.cbClsExtra = 0;
wc.cbWndExtra = 0;
wc.hInstance = hInstance;
wc.hIcon = LoadIcon( NULL, IDI_APPLICATION );
wc.hCursor = LoadCursor( NULL, IDC_ARROW );
wc.hbrBackground = (HBRUSH)GetStockObject( BLACK_BRUSH );
wc.lpszMenuName = NULL;
wc.lpszClassName = TEXT("GLSample");
RegisterClass( &amp;wc );

// create main window
hWnd = CreateWindow(
TEXT("GLSample"), TEXT("OpenGL Sample"),
WS_CAPTION | WS_POPUPWINDOW | WS_VISIBLE,
0, 0, 256, 256,
NULL, NULL, hInstance, NULL );

// enable OpenGL for the window
EnableOpenGL( hWnd, &amp;hDC, &amp;hRC );

// program main loop
while ( !quit )
{

// check for messages
if ( PeekMessage( &amp;msg, NULL, 0, 0, PM_REMOVE ) )
{

// handle or dispatch messages
if ( msg.message == WM_QUIT )
{
quit = TRUE;
}
else
{
TranslateMessage( &amp;msg );
DispatchMessage( &amp;msg );
}

}
else
{

// OpenGL animation code goes here

glClearColor( 0.0f, 0.0f, 0.0f, 0.0f );
glClear( GL_COLOR_BUFFER_BIT );

glPushMatrix();
glRotatef( theta, 0.0f, 0.0f, 1.0f );
glBegin( GL_TRIANGLES );
glColor3f( 1.0f, 0.0f, 0.0f ); glVertex2f( 0.0f, 1.0f );
glColor3f( 0.0f, 1.0f, 0.0f ); glVertex2f( 0.87f, -0.5f );
glColor3f( 0.0f, 0.0f, 1.0f ); glVertex2f( -0.87f, -0.5f );
glEnd();
glPopMatrix();

SwapBuffers( hDC );

theta += 1.0f;

}

}

// shutdown OpenGL
DisableOpenGL( hWnd, hDC, hRC );

// destroy the window explicitly
DestroyWindow( hWnd );

return msg.wParam;

}

// Window Procedure

LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
{

switch (message)
{

case WM_CREATE:
return 0;

case WM_CLOSE:
PostQuitMessage( 0 );
return 0;

case WM_DESTROY:
return 0;

case WM_KEYDOWN:
switch ( wParam )
{

case VK_ESCAPE:
PostQuitMessage(0);
return 0;

}
return 0;

default:
return DefWindowProc( hWnd, message, wParam, lParam );

}

}

// Enable OpenGL

void EnableOpenGL(HWND hWnd, HDC * hDC, HGLRC * hRC)
{
PIXELFORMATDESCRIPTOR pfd;
int format;

// get the device context (DC)
*hDC = GetDC( hWnd );

// set the pixel format for the DC
ZeroMemory( &amp;pfd, sizeof( pfd ) );
pfd.nSize = sizeof( pfd );
pfd.nVersion = 1;
pfd.dwFlags = PFD_DRAW_TO_WINDOW | PFD_SUPPORT_OPENGL | PFD_DOUBLEBUFFER;
pfd.iPixelType = PFD_TYPE_RGBA;
pfd.cColorBits = 24;
pfd.cDepthBits = 16;
pfd.iLayerType = PFD_MAIN_PLANE;
format = ChoosePixelFormat( *hDC, &amp;pfd );
SetPixelFormat( *hDC, format, &amp;pfd );

// create and enable the render context (RC)
*hRC = wglCreateContext( *hDC );
wglMakeCurrent( *hDC, *hRC );

}

// Disable OpenGL

void DisableOpenGL(HWND hWnd, HDC hDC, HGLRC hRC)
{
wglMakeCurrent( NULL, NULL );
wglDeleteContext( hRC );
ReleaseDC( hWnd, hDC );
}I get these errors:



------ Build started: Project: RTS, Configuration: Debug Win32 ------
Compiling...
glsample.cpp
c:\web2\game\rts\rts\glsample.cpp(104) : warning C4244: 'return' : conversion from 'WPARAM' to 'int', possible loss of data
Linking...
glsample.obj : error LNK2019: unresolved external symbol __imp__glPopMatrix@0 referenced in function _WinMain@16
glsample.obj : error LNK2019: unresolved external symbol __imp__glEnd@0 referenced in function _WinMain@16
glsample.obj : error LNK2019: unresolved external symbol __imp__glVertex2f@8 referenced in function _WinMain@16
glsample.obj : error LNK2019: unresolved external symbol __imp__glColor3f@12 referenced in function _WinMain@16
glsample.obj : error LNK2019: unresolved external symbol __imp__glBegin@4 referenced in function _WinMain@16
glsample.obj : error LNK2019: unresolved external symbol __imp__glRotatef@16 referenced in function _WinMain@16
glsample.obj : error LNK2019: unresolved external symbol __imp__glPushMatrix@0 referenced in function _WinMain@16
glsample.obj : error LNK2019: unresolved external symbol __imp__glClear@4 referenced in function _WinMain@16
glsample.obj : error LNK2019: unresolved external symbol __imp__glClearColor@16 referenced in function _WinMain@16
glsample.obj : error LNK2019: unresolved external symbol __imp__wglMakeCurrent@8 referenced in function "void __cdecl EnableOpenGL(struct HWND__ *,struct HDC__ * *,struct HGLRC__ * *)" (?EnableOpenGL@@YAXPAUHWND__@@PAPAUHDC__@@PAPAUHGL RC__@@@Z)
glsample.obj : error LNK2019: unresolved external symbol __imp__wglCreateContext@4 referenced in function "void __cdecl EnableOpenGL(struct HWND__ *,struct HDC__ * *,struct HGLRC__ * *)" (?EnableOpenGL@@YAXPAUHWND__@@PAPAUHDC__@@PAPAUHGL RC__@@@Z)
glsample.obj : error LNK2019: unresolved external symbol __imp__wglDeleteContext@4 referenced in function "void __cdecl DisableOpenGL(struct HWND__ *,struct HDC__ *,struct HGLRC__ *)" (?DisableOpenGL@@YAXPAUHWND__@@PAUHDC__@@PAUHGLRC_ _@@@Z)
C:\web2\game\RTS\Debug\RTS.exe : fatal error LNK1120: 12 unresolved externals
Build log was saved at "file://c:\web2\game\RTS\RTS\Debug\BuildLog.htm"
thank you for the help

01-03-2006, 05:40 PM
Did you link to opengl32.lib?

Add

#pragma comment(lib,"opengl32.lib")

to your source code, or add the library name to your import list from the project options dialog.

Cheers.