TAPI (Telephony application programming interface)

注意：在接口转换时，我们不再调用QueryInterface( ) 而是只用强制转换就可以了。

using System;

using System. Drawing;

using System. Collections;

using System. ComponentModel;

using System. Windows. Forms;

using System. Data;

using TAPI3Lib;

namespace Ҷƪл˵?