What is wrong with this context creation? - c++

Question

I would like to create a render context to use opengl.
The wglMakeCurrent(hdc, hrc) is returning true.
But for some reason OpenGL functions are ignored.
Here is the code for context creation:
int pixelFormat;
hdc = GetDC(hwnd);
PIXELFORMATDESCRIPTOR pfd;
memset(&pfd, 0, sizeof(PIXELFORMATDESCRIPTOR));
pfd.nSize = sizeof(PIXELFORMATDESCRIPTOR);
pfd.nVersion = 1;
pfd.dwFlags = PFD_DOUBLEBUFFER | PFD_SUPPORT_OPENGL | PFD_DRAW_TO_WINDOW;
pfd.iPixelType = PFD_TYPE_RGBA;
pfd.cColorBits = 32;
pfd.cDepthBits = 32;
pfd.iLayerType = PFD_MAIN_PLANE;
pixelFormat = ChoosePixelFormat(hdc,&pfd);
SetPixelFormat(hdc,pixelFormat,&pfd);
hrc = wglCreateContext(hdc);
wglMakeCurrent(hdc, hrc);
And the window creation:
hinst = GetModuleHandle(NULL);
WNDCLASSEX wnd;
memset(&wnd, 0, sizeof(WNDCLASSEX));
wnd.hInstance = hinst;
wnd.style = CS_HREDRAW | CS_VREDRAW;
wnd.cbSize = sizeof(WNDCLASSEX);
wnd.lpszClassName = "__myGLApp__";
wnd.lpfnWndProc = WndProc;
RegisterClassEx(&wnd);
hwnd = CreateWindowEx(WS_EX_TOOLWINDOW,
"__myGLApp__",
"valami",
WS_VISIBLE,
xpos,
ypos,
width,
height,
NULL,
NULL,
hinst,
NULL);
Where am going I wrong?

Answer 1

you can use the glGetError() function to get an error code. You can also get a textual description with the functions gluErrorString() and gluErrorUnicodStringEXT() from the utility library. Something like this:
char *message;
message = gluErrorString(glGetError());
printf("OpenGL error: %s\n", message);