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用VB实现聊天讨论室和点对点会话




Private Sub Comm1_Click()

a.Close 注释：关闭连接

Form1.WindowState = 1

End Sub



Private Sub Comm2_Click()

If Comm2.Caption = "断开连接" Then

a.Close

Comm2.Caption = "连接"

Label3.Caption = "等待连接"

Combo1.Enabled = True

Timer1.Enabled = False

Comm2.MousePointer = 0

Form1.MousePointer = 0

Else

Text2.Text = ""

Label3.Caption = "正在连接.."

Comm2.MousePointer = 11

Form1.MousePointer = 11

Timer1.Enabled = True

flag = False

a.Protocol = sckTCPProtocol

a.RemoteHost = Combo1.Text

a.RemotePort = 3000

a.Connect

End If

End Sub



Private Sub Form_DblClick()

If MsgBox("关闭本聊天室! 确认吗？", 36, "退出系统") = 6 Then

End

Else

Form1.WindowState = 1

End If

End Sub



Private Sub Form_Load()

If App.PrevInstance Then

MsgBox "本系统已经加载，请看任务拦！", 48, "提示"

End

End If

flag = False

Load Form2 ‘读入form2进入监听

End Sub



Private Sub Send_Click()

Dim S As String

On Error GoTo ffff ‘防止链路中断

Send.MousePointer = 11

If Right(Text1.Text, 1) <> Chr(10) Then

S = Text1.Text + Chr(13) + Chr(10)

Else

S = Text1.Text

End If

If flag Then

a.SendData S

End If

Exit Sub

ffff:

MsgBox "连接中断!", 48, "提示"

a.Close

Send.MousePointer = 0

Comm2.Caption = "连接"

Label3.Caption = "等待连接"

Combo1.Enabled = True

Comm2.MousePointer = 0

Form1.MousePointer = 0

Exit Sub

End Sub



Private Sub Timer1_Timer()

flag = False

Timer1.Enabled = False

Comm2.MousePointer = 0

Form1.MousePointer = 0

MsgBox "网络连接失败(超时) ！"

Label3.Caption = "等待连接"

Combo1.Enabled = True

Combo1.SetFocus

a.Close

Comm2.Caption = "连接"

End Sub



⑶ 在Form2的各控件事件中加入如下代码:

Const maxn = 200 ‘最大同时连接本机的客户数

Dim user(maxn) As Boolean



Private Sub Command1_Click()

Form2.Hide

End Sub



Private Sub Command2_Click()

Load Form1

Form1.Show

End Sub



Private Sub Form_Load()

Dim str1 As String

Form2.Caption = "雷萌通信软件"

注释：winsock控件 a 作为服务器程序监听

a.LocalPort = 3000

a.Listen

End Sub



Private Sub a_ConnectionRequest(ByVal requestID As Long)

Dim i As Long

For i = 1 To maxn ‘当一客户请求时给启动一Winsock控件标志号

If Not user(i) Then

user(i) = True

Exit For

End If

Next i

If i > maxn Then

Exit Sub

End If

Load b(i) ‘当一客户请求时启动一Winsock控件

b(i).Accept requestID 注释：实际建立连接

If Text1.Text = "" Then 注释：发送数据

b(i).SendData Chr(0)

Else

b(i).SendData Text1.Text

End If

Form2.Show

End Sub



Private Sub s_Close(Index As Integer)

b(Index).Close 注释：关闭连接

Unload b(Index) 注释：卸载 一个WinSock 控件

user(Index) = False

End Sub

Private Sub b_DataArrival(Index As Integer, ByVal bytesTotal As Long)

Dim str As String

Dim i As Long

b(Index).GetData str

Text1.Text = Text1.Text + str

For i = 1 To maxn

If user(i) Then

b(i).SendData str

End If

Next i

End Sub

三·运行

本程序在VB6.0中编译通过，运行后最小化到任务栏上，也可以用API的Shell_Notifyicon 函数做入右下角的指示器栏中常驻内存。你可以在网络中用一个固定的机器地址作为聊天讨论室，其他用户都选该机地址连接进入该室聊天或讨论。各用户也可选各自熟悉的地址进行连接对话,双击form1空白处从内存中撤出系统。根据同样的原理可以制作电子邮件系统。

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