要求用户正确输入用户名和密码，然后才能进入系统。刚好前几天有个人问俺如何在程序启动时先启动登录对话框的问题，俺就给他写了个示例程序，今天拿出来给大伙共享，有什么...

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要求用户正确输入用户名和密码，然后才能进入系统。刚好前几天有个人问俺如何在程序启动时先启动登录对话框的问题，俺就给他写了个示例程序，今天拿出来给大伙共享，有什么不正确的地方请大家多多指教。-require users to input the correct user name and password before they can access. Just a few days ago I asked how individuals at the time of commencement of first launching the login dialog, winning Actius notebook line he wrote a sample program today to show everyone to share what is in the right place Please exhibitions.