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   源码介绍

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using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;

using System.Runtime.InteropServices;

namespace Ex13_15
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            txtJQHM.Text = GMS.GSMModemGetSnInfoNew(txtCOM.Text, txtBTL.Text);　//机器号码
            txtCOM.Text = GMS.GSMModemGetDevice();　　//ＣＯＭ１
            txtBTL.Text= GMS.GSMModemGetBaudrate();　　//波特率
        }

        private void btnSend_Click(object sender, EventArgs e)
        {
			if(txtSJHM.Text == "") 
			{
				MessageBox.Show("手机号码不能为空！","提示", MessageBoxButtons.OK);
				txtSJHM.Focus();
				return;
			}
			if(txtContent.Text=="")
			{
				MessageBox.Show("短信内容不能为空！", "提示", MessageBoxButtons.OK);
				txtContent.Focus();
				return;
			}

			//连接设备
			if(GMS.GSMModemInitNew(txtCOM.Text, txtBTL.Text, null, null, false, txtPower.Text)==false)
			{
				MessageBox.Show("设备连接失败!"   GMS.GSMModemGetErrorMsg(),"提示", MessageBoxButtons.OK);
				return;
			}
			// 发送短信
            if (GMS.GSMModemSMSsend(null, 8, txtContent.Text, Encoding.Default.GetByteCount(txtContent.Text),txtSJHM.Text, false) == true)
				MessageBox.Show("短信发送成功!", "提示", MessageBoxButtons.OK);
			else
				MessageBox.Show("短信发送失败!"   GMS.GSMModemGetErrorMsg(), "提示", MessageBoxButtons.OK);
        }

        private void btnResvice_Click(object sender, EventArgs e)
        {
            //连接设备
            if (GMS.GSMModemInitNew(txtCOM.Text, txtBTL.Text, null, null, false, txtPower.Text) == false)
            {
                MessageBox.Show("连接失败!"   GMS.GSMModemGetErrorMsg(), "提示", MessageBoxButtons.OK);
                return;
            }
            //接收短信
            txtContent.Text = GMS.GSMModemSMSReadAll(1);
            if (txtContent.Text.Length <= 0)
            {
                MessageBox.Show("暂时没有新的信息！","系统提示",MessageBoxButtons.OK,MessageBoxIcon.Information);
                return;
            }
            txtSJHM.Text = txtContent.Text.Substring(0, 13);
            txtContent.Text = txtContent.Text.Substring(13, txtContent.Text.Length-13);
        }
    }
}

class GMS
{
    //初始化gsm modem,并连接gsm modem
    [DllImport("dllforvc.dll",
         EntryPoint = "GSMModemInitNew",
         CharSet = CharSet.Ansi,
         CallingConvention = CallingConvention.StdCall)]
    public static extern bool GSMModemInitNew(
        string device,
        string baudrate,
        string initstring,
        string charset,
        bool swHandshake,
        string sn);

    //获取短信猫新的标识号码
    [DllImport("dllforvc.dll",
         EntryPoint = "GSMModemGetSnInfoNew",
         CharSet = CharSet.Ansi,
         CallingConvention = CallingConvention.StdCall)]
    public static extern string GSMModemGetSnInfoNew(string device, string baudrate);

    //获取当前通讯端口
    [DllImport("dllforvc.dll",
         EntryPoint = "GSMModemGetDevice",
         CharSet = CharSet.Ansi,
         CallingConvention = CallingConvention.StdCall)]
    public static extern string GSMModemGetDevice();

    //获取当前通讯波特率
    [DllImport("dllforvc.dll",
         EntryPoint = "GSMModemGetBaudrate",
         CharSet = CharSet.Ansi,
         CallingConvention = CallingConvention.StdCall)]
    public static extern string GSMModemGetBaudrate();

    //断开连接并释放内存空间		
    [DllImport("dllforvc.dll",
         EntryPoint = "GSMModemRelease",
         CharSet = CharSet.Ansi,
         CallingConvention = CallingConvention.StdCall)]
    public static extern void GSMModemRelease();

    //取得错误信息	
    [DllImport("dllforvc.dll",
         EntryPoint = "GSMModemGetErrorMsg",
         CharSet = CharSet.Ansi,
         CallingConvention = CallingConvention.StdCall)]
    public static extern string GSMModemGetErrorMsg();

    //发送短信息
    [DllImport("dllforvc.dll",
         EntryPoint = "GSMModemSMSsend",
         CharSet = CharSet.Ansi,
         CallingConvention = CallingConvention.StdCall)]
    public static extern bool GSMModemSMSsend(
        string serviceCenterAddress,
        int encodeval,
        string text,
        int textlen,
        string phonenumber,
        bool requestStatusReport);

    //接收短信息返回字符串格式为:手机号码|短信内容||手机号码|短信内容||
    //RD_opt为１接收短信息后不做任何处理，０为接收后删除信息
    [DllImport("dllforvc.dll",
         EntryPoint = "GSMModemSMSReadAll",
         CharSet = CharSet.Ansi,
         CallingConvention = CallingConvention.StdCall)]
    public static extern string GSMModemSMSReadAll(int RD_opt);
}