一个简单的在纯C语言环境使用WindowsAPI进行编程的SDK应用程序。颠覆传统虚拟桌面时钟的风格，生成圆形窗口的时钟，实时显示当前系统时间，平滑转动表针，支持窗口透明等-A simple Win32API based application under C environment. This is a virtual screen clock, which shows the current system time real-time, with its circled-window whi