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#include <windows.h> 
LRESULT CALLBACK WndProc(HWND, UINT, WPARAM, LPARAM);
LPCTSTR lpszClass = TEXT("HelloClass");

int APIENTRY WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nShowCmd)
{
    HWND hWnd;
    MSG Message;
    WNDCLASS WndClass;

    WndClass.cbClsExtra = 0;
    WndClass.cbWndExtra = 0;
    WndClass.hbrBackground = (HBRUSH)GetStockObject(WHITE_BRUSH); 
    WndClass.hCursor = LoadCursor(NULL, IDC_ARROW);
    WndClass.hIcon = LoadIcon(NULL, IDI_APPLICATION);
    WndClass.hInstance = hInstance;
    WndClass.lpfnWndProc = WndProc;
    WndClass.lpszClassName = lpszClass;
    WndClass.lpszMenuName = NULL;
    WndClass.style = CS_HREDRAW | CS_VREDRAW;
    RegisterClass(&WndClass);

    hWnd = CreateWindow(lpszClass, lpszClass, WS_OVERLAPPEDWINDOW,
                CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT, 
                NULL, (HMENU)NULL, hInstance, NULL);
    ShowWindow(hWnd, nShowCmd);

    while ( GetMessage(&Message, NULL, 0, 0) )
    {
        TranslateMessage(&Message);
        DispatchMessage(&Message);
    }
    return (int)Message.wParam;
}
LRESULT CALLBACK WndProc(HWND hWnd, UINT iMessage, WPARAM wParam, LPARAM lParam)
{
    switch (iMessage)
    {
    case WM_DESTROY:
        PostQuitMessage(0);
        return 0;
    }
    return DefWindowProc(hWnd, iMessage, wParam, lParam);
}