Option Explicit On
Imports System.IO
Imports System.Net.Sockets

Public Class Form5
    Dim Listener As New TcpListener(8000)
    Dim Client As TcpClient
    Dim appPath As String = Application.StartupPath()
    Dim Newline As String
    Dim message As String
    Dim nStart As Integer
    Dim nLast As Integer
    Private IsFormBeingDragged As Boolean = False

    Private MouseDownX As Integer

    Private MouseDownY As Integer

    Dim z As String

    Private Sub Form1_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
        For counter = 10 To 90 Step +20

            Me.Opacity = counter / 100

            Me.Refresh()

            Threading.Thread.Sleep(50)
        Next


        Me.Opacity = 100

    End Sub



    Private Sub Form1_MouseDown(ByVal sender As Object, ByVal e As MouseEventArgs) Handles MyBase.MouseDown



        If e.Button = MouseButtons.Left Then

            IsFormBeingDragged = True

            MouseDownX = e.X

            MouseDownY = e.Y

        End If

    End Sub



    Private Sub Form1_MouseUp(ByVal sender As Object, ByVal e As MouseEventArgs) Handles MyBase.MouseUp



        If e.Button = MouseButtons.Left Then

            IsFormBeingDragged = False

        End If

    End Sub



    Private Sub Form1_MouseMove(ByVal sender As Object, ByVal e As MouseEventArgs) Handles MyBase.MouseMove



        If IsFormBeingDragged Then

            Dim temp As Point = New Point()



            temp.X = Me.Location.X + (e.X - MouseDownX)

            temp.Y = Me.Location.Y + (e.Y - MouseDownY)
            Me.Location = temp

            temp = Nothing

        End If

    End Sub
    Private Sub Form5_Disposed(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Disposed
        Listener.Stop()
    End Sub

    Private Sub Form5_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
        Timer1.Start()
        Listener.Start()
    End Sub

    Private Sub Timer1_Tick(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Timer1.Tick
      
        If Listener.Pending = True Then
            message = ""
            Client = Listener.AcceptTcpClient()
            Dim reader As New StreamReader(Client.GetStream())
            While reader.Peek <> -1
                message &= Convert.ToChar(reader.Read()).ToString
            End While
            Dim Newline As String
            Newline = System.Environment.NewLine
            If message.Contains("</>") Then
                nStart = InStr(message, "</>") + 4
                nLast = InStr(message, "<\>")
                message = Newline & "對方：" & Mid(message, nStart, nLast - nStart)
            End If
          
        End If

        TextBox1.Text += message
        TextBox1.SelectionStart = TextBox1.TextLength
        TextBox1.ScrollToCaret()
        message = ""



    End Sub

    Private Sub Button5_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button5.Click
        Dim iCount As Integer

        For iCount = 90 To 10 Step -10
            Me.Opacity = iCount / 100
            Threading.Thread.Sleep(50)
        Next
        Me.Close()
    End Sub

    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        Dim client As TcpClient
        If TextBox3.Text = "" Then
            MsgBox("未設定對方IP地址")
        End If
        Try
            client = New TcpClient(TextBox3.Text, 8000)
            Dim writer As New StreamWriter(client.GetStream())
            writer.Write("</>" & " " & TextBox2.Text & "<\>")
            writer.Flush()
        Catch ex As Exception
            MsgBox(ex.Message & "對方啟動了嗎？")
        End Try
        Newline = System.Environment.NewLine
        TextBox1.Text += Newline & "本地：" & TextBox2.Text
        TextBox1.SelectionStart = TextBox1.TextLength
        TextBox1.ScrollToCaret()
        TextBox2.Text = ""
    End Sub

    Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs)
      
    End Sub

    
    Private Sub Button3_Click(ByVal sender As System.Object, ByVal e As System.EventArgs)

    End Sub

    Private Sub Button2_Click_1(ByVal sender As System.Object, ByVal e As System.EventArgs)

    End Sub

    
    Private Sub PictureBox1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles PictureBox1.Click

    End Sub

    Private Sub Button2_Click_2(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click
        Dim sb As New System.Text.StringBuilder
        Dim sfile As System.IO.FileStream
        If My.Computer.FileSystem.FileExists(appPath & "\聊天室對話" & ".txt") = False Then
            sfile = System.IO.File.Create(appPath & "\聊天室對話" & ".txt")
            sfile.Dispose()
        End If

        sb.AppendLine(TextBox1.Text)
        IO.File.WriteAllText((appPath & "\聊天室對話" & ".txt"), sb.ToString(), System.Text.Encoding.GetEncoding(950))
        MsgBox("對話已儲存")
    End Sub
End Class