namespace WindowsApplication1
{
    public delegate void LDTCallBack(int port);

    class LDT
    {

        [DllImport("Sandu.dll", EntryPoint = "Setup_Tel")]
        public static extern void Setup_Tel(LDTCallBack CallBack, int y);

        [DllImport("Sandu.dll", EntryPoint = "Begin_Tel")]
        public static extern int Begin_Tel(int Port, char Power);

        [DllImport("Sandu.dll", EntryPoint = "End_Tel")]
        public static extern int End_Tel(int Port);

        [DllImport("Sandu.dll", EntryPoint = "GetNumber_Tel")]
        public static extern StringBuilder GetNumber_Tel(int Port);

        [DllImport("Sandu.dll", EntryPoint = "DevCount_Tel")]
        public static extern int DevCount_Tel();
}
}

public delegate bool CallBack(int hwnd, int lParam);

    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        public void MyCallBack(int port)
        {
            if (port == 0)
            {
                //设备有改变
            }
            else 
            {
                string number;
                number = LDT.GetNumber_Tel(port).ToString();
                listBox1.Items.Add("端口"+port+":　来电号码 "+number);
            }
        }

        private void btnSetup_Click(object sender, EventArgs e)
        {
            //设置回调

            LDTCallBack callback = new LDTCallBack(MyCallBack);

            LDT.Setup_Tel(callback, 1);

            listBox1.Items.Add("设置回调成功");
        }

        private void button1_Click(object sender, EventArgs e)
        {
            //打开设备

            for (int i = 1; i <= LDT.DevCount_Tel(); i++)
            {
                if (LDT.Begin_Tel(i, '1') == 1)
                {
                    listBox1.Items.Add("开启设备" + i.ToString() + "成功");
                }
            }
        }

        private void Form1_FormClosing(object sender, FormClosingEventArgs e)
        {
           // return;
            try
            {
                for (int i = 1; i <= LDT.DevCount_Tel(); i++)
                {
                    LDT.End_Tel(i);
                }
            }
            catch 
            { }
            
        }

        private void button1_Click_1(object sender, EventArgs e)
        {
            frmEnum frm = new frmEnum();

            frm.ShowDialog();

            frm.Close();
        }

        private void Form1_Load(object sender, EventArgs e)
        {

        }

    }