C#调用C++Dll例程

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//Form1.cs内容：using System;using System.Windows.Forms;using System.Runtime.InteropServices;using System.Text;namespace WindowsFormsApplication1{    public partial class Form1 : Form    {        public Form1()        {            InitializeComponent();        }        //申明DLL中函数         [DllImport("KB_Dll.dll", EntryPoint = "InputKey")]        //不加密输入密码        private static extern int InputKey(string m_comm, string extCom, int time_out, int Cmd, StringBuilder Pwd);//不加密输入密码//[Out,MarshalAs(UnmanagedType.LPArray)]        private void button1_Click(object sender, EventArgs e)        {            string m_comm = "USB_vid4754&pid9020";            string extCom="NULL";            int timeout=20;            int Cmd;                        StringBuilder Pwd = new StringBuilder(300);            Cmd = 1;            int recv = 0;            recv = InputKey(m_comm, extCom, timeout, Cmd, Pwd);            MessageBox.Show(Pwd.ToString());                    }        private void Form1_Load(object sender, EventArgs e)        {        }    }}