#include <windows.h>#include <gl/gl.h>LRESULT CALLBACK WindowHandler(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam){  switch(msg){    case WM_CLOSE:         DestroyWindow(hwnd);    break;    case WM_DESTROY:         PostQuitMessage(0);    break;    default: return DefWindowProc(hwnd, msg, wParam, lParam);  }}int WINAPI WinMain(HINSTANCE hThisInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nCmdShow){ WNDCLASSEX wincl;  wincl.cbSize = sizeof(WNDCLASSEX); wincl.style = CS_OWNDC; wincl.hIcon = LoadIcon(NULL, IDI_APPLICATION); wincl.hCursor = LoadCursor(NULL, IDC_ARROW); wincl.hbrBackground = (HBRUSH) GetStockObject(BLACK_BRUSH); wincl.cbClsExtra = 0; wincl.cbWndExtra = 0; wincl.hInstance = hThisInstance; wincl.lpszMenuName = NULL; wincl.lpszClassName = "MyWindowClass"; wincl.lpfnWndProc = WindowHandler;  RegisterClassEx(&wincl);  HWND hwnd;  hwnd = CreateWindow(   "MyWindowClass",   "OpenGl",   WS_POPUPWINDOW | WS_VISIBLE,   70, 70,   700,   510,   NULL,   NULL,   hThisInstance,   NULL );  HDC hDc; HGLRC hRc; PIXELFORMATDESCRIPTOR pfd; int iFormat;  hDc = GetDC(hwnd);  ZeroMemory(&pfd, sizeof(pfd)); pfd.nSize = sizeof(pfd); pfd.nVersion = 1; pfd.dwFlags = PFD_DRAW_TO_WINDOW | PFD_DOUBLEBUFFER | PFD_SUPPORT_OPENGL; pfd.iPixelType = PFD_TYPE_RGBA; pfd.cColorBits = 24; pfd.cDepthBits = 16;  pfd.iLayerType = PFD_MAIN_PLANE;  iFormat = ChoosePixelFormat(hDc, &pfd); SetPixelFormat(hDc, iFormat, &pfd);  /*Create & enable rendering context*/ hRc = wglCreateContext(hDc); wglMakeCurrent(hDc, hRc);  BOOL bQuit = false; MSG msg;  while(!bQuit){    if(PeekMessage(&msg, NULL, 0, 0, PM_REMOVE)){         if(msg.message == WM_QUIT){                        bQuit = true;                        }         else{            TranslateMessage(&msg);            DispatchMessage(&msg);         }                                             }    else{       /*Drawing scene goes here*/       glClearColor(0.0f, 0.0f, 0.0f, 0.0f);       glClear(GL_COLOR_BUFFER_BIT);        glBegin(GL_POINTS);         glVertex2f(0.2f, 0.2f);        glEnd();       SwapBuffers(hDc);                    }                              }  wglMakeCurrent(NULL, NULL); wglDeleteContext(hRc); ReleaseDC(hwnd, hDc);  DestroyWindow(hwnd);    }