#include <windows.h>

LRESULT CALLBACK wnd_proc(HWND hwnd, UINT message, WPARAM wp, LPARAM lp) {
    switch(message) {
    case WM_CLOSE:
        DestroyWindow(hwnd);
        break;
    case WM_DESTROY:
        PostQuitMessage(0);
    default:
        return DefWindowProc(hwnd, message, wp, lp);
    }
    return 0;
}

int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE, LPSTR, int) {

    WNDCLASSEX wc;

    wc.cbSize = sizeof(WNDCLASSEX);
    wc.cbClsExtra = 0;
    wc.style = 0;
    wc.lpfnWndProc = wnd_proc;
    wc.cbWndExtra = 0;
    wc.hInstance = hInstance;
    wc.hIcon = LoadIcon(NULL, IDI_APPLICATION);
    wc.hIconSm = LoadIcon(NULL, IDI_APPLICATION);
    wc.hCursor = LoadCursor(NULL, IDC_ARROW);
    wc.hbrBackground = (HBRUSH)(COLOR_WINDOW+1);
    wc.lpszMenuName = NULL;
    wc.lpszClassName = "NAZWA_KLASY";

    RegisterClassEx(&wc);
	
	HWND window = CreateWindowEx(0, "NAZWA_KLASY", "Tytuł", 
		WS_OVERLAPPEDWINDOW | WS_VISIBLE,
		CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT, 
		NULL, NULL, hInstance, NULL);
    
	if(!window) return -1;
    
	MSG msg;
	while( GetMessage( &msg, 0, 0, 0 ) ) {
		TranslateMessage( &msg );
		DispatchMessage( &msg );
	}
	
	return 1;
}