用VC写的自定义控件的程序 该控件是一个MFC常规DLL，它实现了一个简单的功能，类似于Static控件。 它可以显示一段文本 当用户利用鼠标左键单击时，该控件就给父窗口发送一个单击通知消息 可以响应两个用户自定义消息，WM_SETCONTROLTEXT（设置显示的文本）-VC write OCX control of the process is a conventional MFC DLL, it achieved a simple function, like Static Control. It can show a text when users click the left mouse button, the controls became a father window click send alerts to respond to two user-defined information. WM_SETCONTROLTEXT (setting displays the text) WM_GETCONTROLTEXT (to be shown in the text)