First OpenGL problem

  
#define WIN32_LEAN_AND_MEAN

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

float angle = 0.0f;
HDC g_HDC;

void SetupPixelFormat(HDC hDC)
{
	int nPixelFormat;

	static PIXELFORMATDESCRIPTOR pfd = {
		sizeof(PIXELFORMATDESCRIPTOR),
		1,
		PFD_DRAW_TO_WINDOW |
		PFD_SUPPORT_OPENGL |
		PFD_DOUBLEBUFFER,
		PFD_TYPE_RGBA,
		32,
		0, 0, 0, 0, 0, 0,
		0,
		0,
		0,
		0, 0, 0, 0,
		16,
		0,
		0,
		PFD_MAIN_PLANE,
		0,
		0, 0, 0 };
	
	nPixelFormat = ChoosePixelFormat(hDC, &pfd);

	SetPixelFormat(hDC, nPixelFormat, &pfd);

}

LRESULT CALLBACK WndProc(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
{
	static HGLRC hRC;
	static HDC hDC;
	char string[] = "Hello, World!";
	int width, height;

	switch(message)
	{
		case WM_CREATE:

			hDC = GetDC(hwnd);
			g_HDC= hDC;
			SetupPixelFormat(hDC);

			hRC = wglCreateContext(hDC);
			wglMakeCurrent(hDC, hRC);

			return 0;
			break;

		case WM_CLOSE:

			wglMakeCurrent(hDC, NULL);
			wglDeleteContext(hRC);

			PostQuitMessage(0);

			return 0;
			break;

		case WM_SIZE:
				
			height = HIWORD(lParam);
			width = LOWORD(wParam);

			if (height==0)
			{
				height = 1;
			}
			glViewport(0, 0, width, height);
			glMatrixMode(GL_PROJECTION);
			glLoadIdentity();

			gluPerspective(45.0f,(GLfloat)width/(GLfloat)height,1.0f,1000.0f);

			glMatrixMode(GL_MODELVIEW);
			glLoadIdentity();

			return 0;
			break;

		default:
			break;

	}
	
	return (DefWindowProc(hwnd, message, wParam, lParam));
}

int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nShowCmd)
{
	WNDCLASSEX windowClass;
	HWND hwnd;
	MSG msg;
	bool done;

	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	= "MyClass";
	windowClass.hIconSm			= LoadIcon(NULL, IDI_WINLOGO);

	if (!RegisterClassEx(&windowClass))
		return 0;

	hwnd = CreateWindowEx(NULL,
						"MyClass",
						"The OpenGL Window Application",
						WS_OVERLAPPEDWINDOW | WS_VISIBLE |
						WS_SYSMENU | WS_CLIPCHILDREN |
						WS_CLIPSIBLINGS,
						100, 100,
						400, 400,
						NULL,
						NULL,
						hInstance,
						NULL);

	if (!hwnd)
		return 0;

	ShowWindow(hwnd, SW_SHOW);
	UpdateWindow(hwnd);

	done = false;

	while (!done)
	{
		
		PeekMessage(&msg, hwnd, NULL, NULL, PM_REMOVE);

		if (msg.message == WM_QUIT)
		{
			done = true;
		}
		else
		{
			glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
			glLoadIdentity();

			angle = angle + 0.1f;
			if (angle >= 360.0f)
				angle = 0.0f;
			glTranslatef(0.0f,0.0f,-5.0f);
			glRotatef(angle, 0.0f,0.0f,1.0f);

			glColor3f(1.0f,0.0f,0.0f);
			glBegin(GL_TRIANGLES);
				glVertex3f(0.0f,0.0f,0.0f);
				glVertex3f(1.0f,0.0f,0.0f);
				glVertex3f(1.0f,1.0f,0.0f);
			glEnd();

			SwapBuffers(g_HDC);

			TranslateMessage(&msg);
			DispatchMessage(&msg);

		}

	}
	return msg.wParam;
}