using Microsoft.Win32;
using System;
using System.IO;
using System.IO.Ports;
using System.Runtime.InteropServices;
using System.Threading;
using System.Windows.Forms;
using 优软MES.CustomControl;
namespace 优软MES
{
    public partial class Weigher : Form
    {
        [DllImport("user32.dll")]
        public static extern bool ReleaseCapture();
        [DllImport("user32.dll")]
        public static extern bool SendMessage(IntPtr hwnd, int wMsg, int wParam, int lParam);
        public const int WM_SYSCOMMAND = 0x0112;
        public const int SC_MOVE = 0xF010;
        public const int HTCAPTION = 0x0002;
        string LastData="";
        //实例化一个串口
        SerialPort serialPort1 = new SerialPort();
        Thread thread;
        bool getData;
        public Weigher()
        {
            InitializeComponent();
            CheckForIllegalCrossThreadCalls = false;
            GetComList();
        }

        private void Weigher_Load(object sender, EventArgs e)
        {
            this.headBar1.MouseDown += new MouseEventHandler(headBar_MouseDown);
        }

        private void GetSeriadlData_Click(object sender, EventArgs e)
        {
            getData = true;
            thread = new Thread(getSerialData);
            thread.Start();
        }

  
        private void StopGetSeriadlData_Click(object sender, EventArgs e)
        {
            getData = false;
            Thread.Sleep(1000);
            serialPort1.Close();
        }
        //开始接受串口数据
        private void getSerialData(){

            if (!serialPort1.IsOpen)
            {
                serialPort1.PortName = this.comboBox1.Text;
                serialPort1.BaudRate =int.Parse(BaudRate.Text);
                serialPort1.Open();
                DataFlush.Text = "开始接受数据\n";
                while (getData)
                {
                    try { ShowData(serialPort1.ReadLine() + "\n"); }
                    catch (IOException ex) { MessageBox.Show(ex.Message); }
                }
            }
            else {
                MessageBox.Show("请勿重复打开端口", "警告");
            }
        }

        // 获取串口列表
        private void GetComList()
        {
            RegistryKey keyCom = Registry.LocalMachine.OpenSubKey("Hardware\\DeviceMap\\SerialComm");
            
            if (keyCom != null)
            {
                string[] sSubKeys = keyCom.GetValueNames();
                //获取串口的名称
                //for (int i = 0; i < sSubKeys.Length; i++)
                //{
                //    string sValue = (string)(sSubKeys[i]);
                //    comboBox1.Items.Add(sValue);
                //    comboBox1.SelectedIndex = i;
                //}
                
                //获取串口号
                for (int i = 0; i < sSubKeys.Length; i++)
                {
                    string sValue = (string)keyCom.GetValue(sSubKeys[i]);
                    comboBox1.Items.Add(sValue);
                    comboBox1.SelectedIndex = i;
                }
            }
        }

        private void headBar_MouseDown(object sender, MouseEventArgs e)
        {
            ReleaseCapture();
            SendMessage(this.Handle, WM_SYSCOMMAND, SC_MOVE + HTCAPTION, 0);
        }

        private void ShowData(string Data) {
            //判断数据是否稳定，将稳定值展示到称量结果
            if (Data.Substring(0, 1) == "S")
            {
                    WeigherData.Text = Data;    
            }
            //判断数据和上一条是否相等
            if (!(LastData == Data)) {
                DataFlush.AppendText(Data);
            }
            LastData = Data;
        }

        private void Weigher_FormClosing(object sender, FormClosingEventArgs e)
        {
            if (serialPort1.IsOpen)
            {
                MessageBoxButtons messButton = MessageBoxButtons.YesNo;
                string logout_confirm = MessageBox.Show(this.ParentForm, "端口尚未关闭，仍要关闭窗口？", "警告！", messButton).ToString();
                if (!(logout_confirm == "Yes"))
                {
                    e.Cancel = true;
                }
            }
        }
    }
}