纽曼来电通二次开发，遇到问题，求高手来解答
大家好！小弟第一次发帖，第一次接触C#，原先搞JAVA开发，低下两个C#的类文件代码：

C# code

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();}}

C# code

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)        {        }    }

现在就是运行 form1代码没错，但是电话号码就是取不出来，求指点。
在打开设备（纽曼来电通），和设置回调函数（LDTCallBack callback = new LDTCallBack(MyCallBack);
LDT.Setup_Tel(callback, 1);）时没出现问题，但是当有电话打来是listBox1.Items.Add("端口"+port+":　来电号码 "+number);就是不执行！求解


[解决办法]
建议寻求纽曼来电通厂家的技术支持，找他们要那几个API的使用demo，再不行，把你的代码寄给他们，让他们调通后，寄回给你。说点儿好听的给他们听，就搞定了。预祝楼主工作顺利！
[解决办法]
1.在listBox1.Items.Add("端口"+port+":　来电号码 "+number);处按F9设断点，
单步调试一下看看程序有没有走这里；
2.看窗体是不是假死了，在
listBox1.Items.Add("端口"+port+":　来电号码 "+number);
后面加上this.Refresh();试试；
3.Setup_Tel(LDTCallBack CallBack, int y);你确定这个y指的是port？
[解决办法]
我的QQ 448155141 这个我做好了 估计是厂家给你的接口不对
[解决办法]
楼主，这是MSDN上的例子：
C++：
void TestCallBack(FPTR pf, int value);

void TestCallBack2(FPTR2 pf2, char* value);

C#：
public delegate bool FPtr( int value );
public delegate bool FPtr2( String value );

public class LibWrap
{// Declares managed prototypes for unmanaged functions.
[ DllImport( "..\\LIB\\PinvokeLib.dll" )]
public static extern void TestCallBack( FPtr cb, int value );
[ DllImport( "..\\LIB\\PinvokeLib.dll" )]
public static extern void TestCallBack2( FPtr2 cb2, String value );
}
public class App
{
public static void Main()
{
FPtr cb = new FPtr( App.DoSomething );
LibWrap.TestCallBack( cb, 99 );
FPtr2 cb2 = new FPtr2( App.DoSomething2 );
LibWrap.TestCallBack2( cb2, "abc" );
}

public static bool DoSomething( int value )
{
Console.WriteLine( "\nCallback called with param: {0}", value );
…
}
public static bool DoSomething2( String value )
{
Console.WriteLine( "\nCallback called with param: {0}", value );
…
}
}