/// Copyright(c) Emtronix Inc.
/// 
/// 程序作者：李林 leeleen@emtronix.com
///                leeleen@sjtu.org
///                leeleen@263.net
/// 
/// 最后修改時間：2008-05-23 汶川8級地震余震期間
/// +86-28-86180660
/// 成都英創信息技術有限公司
/// Emtronix是英創公司的注冊商標
/// 本程序免費提供給購買英創公司EM9000產品的客戶使用
/// 未購買英創公司產品的客戶或未獲得英創授權的客戶不得使用
/// 
/// 本程序注意事項：
/// （1）由于調用WIN32 API RASDial需要用到不安全代碼，需要在『項目』—『屬性』—『生成』里面選擇“允許不安全代碼”；
/// （2）上電過程需要調用EM9000_ISA_DLL.dll動態鏈接庫，所以請將該動態鏈接庫下載到目標平臺的相關目錄里；
/// （3）GPRS模塊上電過程在Program.cs里面實現（調用ISA動態鏈接庫），撥號過程在Form1.cs里面實現；
/// （4）本程序上電過程適用于華為GTM9000 GPRS模塊。

using System;
using System.Text;
using System.Windows.Forms;
using System.Runtime.InteropServices;

namespace EM9000_GPRS_Dial
{
    public partial class GPRS_FORM : Form
    {
        #region Win32 API RASDial函數聲明
        [DllImport("coredll.dll")]
        public static extern uint RasDial(IntPtr dialExtensions, IntPtr phoneBookPath, IntPtr rasDialParam, uint NotifierType, IntPtr notifier, ref IntPtr pRasConn);

        [DllImport("coredll.dll")]
        public static extern uint RasHangUp(IntPtr pRasConn);
        #endregion

        //再次提醒：GPRS模塊上電過程在Program.cs里實現，請在Program.cs里參見相關代碼
        IntPtr Connect = IntPtr.Zero;

        public GPRS_FORM()
        {
            InitializeComponent();
        }

        private void Exit_button_Click(object sender, EventArgs e)
        {
            this.Close();
        }

        private void Dial_button_Click(object sender, EventArgs e)
        {
            Connect = IntPtr.Zero;

            uint result = myRasDial("GPRS", "", "", out Connect);

            if (result != 0)
            {
                MessageBox.Show("連接失敗！");
                RasHangUp(Connect);
            }
            else
                MessageBox.Show("連接成功！");
        }

        private void Hang_button_Click(object sender, EventArgs e)
        {
            if (RasHangUp(Connect) == 0)
            {
                MessageBox.Show("掛斷成功！");
            }
            else
                MessageBox.Show("掛斷失敗！");
        }

        unsafe public static uint myRasDial(string EntryName, string UserName, string Password, out IntPtr RasConn)
        {
            /*EntryName ,UserName,Password - same as in RASDIALPARAMS structure (see MSDN)*/
            uint r = 0;
            RasConn = IntPtr.Zero;
            byte[] bRASDIALPARAMS = new byte[1464];
            fixed (byte* pAddr = bRASDIALPARAMS)
            {
                byte* pCurrent = pAddr;
                Marshal.WriteInt32((IntPtr)pCurrent, bRASDIALPARAMS.Length);
                pCurrent += 4;
                foreach (byte b in Encoding.Unicode.GetBytes(EntryName))
                {
                    Marshal.WriteByte((IntPtr)pCurrent, b);
                    pCurrent++;
                }
                pCurrent = pAddr + 0x192;//0x192 - offset for RASDIALPARAMS.UserName
                foreach (byte b in Encoding.Unicode.GetBytes(UserName))
                {
                    Marshal.WriteByte((IntPtr)pCurrent, b);
                    pCurrent++;
                }
                pCurrent = pAddr + 0x394;//0x394 - offset for RASDIALPARAMS.Password
                foreach (byte b in Encoding.Unicode.GetBytes(Password))
                {
                    Marshal.WriteByte((IntPtr)pCurrent, b);
                    pCurrent++;
                }
                r = RasDial(IntPtr.Zero, IntPtr.Zero, (IntPtr)pAddr, 0, IntPtr.Zero, ref RasConn);
            }
            return r;
        }
    }
}