#include <windows.h>

LRESULT CALLBACK WndProc(HWND, UINT, WPARAM, LPARAM);
char szClassNme[] = "sample window";

int APIENTRY WinMain(HINSTANCE hInstance, HINSTANCE hPreInst, LPSTR lpCmdLine,
	int nCmdShow) {
	HWND hWnd;
	MSG msg;
	WNDCLASS wndcls;
	if (!hPreInst) {
		wndcls.style = CS_HREDRAW | CS_VREDRAW;
		wndcls.lpfnWndProc = WndProc;
		wndcls.cbClsExtra = 0;
		wndcls.cbWndExtra = 0;
		wndcls.hInstance = hInstance;
		wndcls.hIcon = NULL;
		wndcls.hCursor = LoadCursor(NULL, IDC_ARROW);
		wndcls.hbrBackground = (HBRUSH)GetStockObject(WHITE_BRUSH);
		wndcls.lpszMenuName = NULL;
		wndcls.lpszClassName = szClassNme;
		if (!RegisterClass(&wndcls))
			return FALSE;
	}
	hWnd = CreateWindow(szClassNme, lpCmdLine, WS_OVERLAPPEDWINDOW,
		CW_USEDEFAULT, CW_USEDEFAULT, 320, 240, NULL, NULL, hInstance, NULL);
	ShowWindow(hWnd, nCmdShow);
	UpdateWindow(hWnd);


	while(1){
		if(PeekMessage(&msg,0,0,0,PM_REMOVE)){
			if(msg.message == WM_QUIT)
				return 0;
			TranslateMessage(&msg);
			DispatchMessage(&msg);
		}
	}
}

LRESULT CALLBACK WndProc(HWND hWnd, UINT msg, WPARAM wParam, LPARAM lParam) {
	switch (msg) {
		case WM_DESTROY:
			PostQuitMessage(0);
			break;
		case WM_PAINT:
		  {
    			HDC hDC=GetDC(hWnd);
			for(int a=0;a<100;++a)
    				SetPixelV(hDC,a+100,a+100,RGB(255,0,0));
    			ReleaseDC(hWnd,hDC);
    		  }
		break;
		default:
			return(DefWindowProc(hWnd, msg, wParam, lParam));
	}
	return (0L);
}