DispSink 属性示例说明单身服务器对象（只能有一个实例的对象），该对象有自己的双重接口和用于引发事件的调度接口。-Property DispSink example illustrates a single server object [there can be only one instance of the object], the object has its own dual interface and used to trigger event scheduling interf

一个完整的 ATL 控件，只能输入大小写字母，对于非字母的输入会触发事件。非常完整的例子。-A complete ATL control can only enter uppercase and lowercase letters, for non-alphabetic input trigger event. Very complete example.