用Winsock连接其他电脑，判断是否连接

【实例简介】用Winsock连接对方电脑，判断是否连接

【实例截图】

【核心代码】

VERSION 5.00
Object = "{248DD890-BB45-11CF-9ABC-0080C7E7B78D}#1.0#0"; "MSWINSCK.OCX"
Begin VB.Form Form1 
   Caption         =   "Form1"
   ClientHeight    =   4050
   ClientLeft      =   60
   ClientTop       =   450
   ClientWidth     =   6630
   LinkTopic       =   "Form1"
   ScaleHeight     =   4050
   ScaleWidth      =   6630
   StartUpPosition =   3  '窗口缺省
   Begin MSWinsockLib.Winsock Winsock1 
      Left            =   3480
      Top             =   1320
      _ExtentX        =   741
      _ExtentY        =   741
      _Version        =   393216
   End
End
Attribute VB_Name = "Form1"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = False
Option Explicit
 
Dim m_blnConnect As Boolean
Dim m_blnNoEcho As Boolean
 
Private Sub Form_Load()
    Me.Show
    Me.Winsock1.Protocol = sckTCPProtocol
    Me.Winsock1.Connect "127.0.0.1", 12345
    Do
        DoEvents
    Loop Until m_blnNoEcho Or m_blnConnect
     
    If m_blnNoEcho Then
        MsgBox "对方电脑没开"
        Me.Winsock1.Close
    End If
End Sub
 
Private Sub Form_Unload(Cancel As Integer)
    Me.Winsock1.Close
End Sub
 
Private Sub Winsock1_Connect()
    m_blnConnect
End Sub
 
Private Sub Winsock1_Error(ByVal Number As Integer, Description As String, ByVal Scode As Long, ByVal Source As String, ByVal HelpFile As String, ByVal HelpContext As Long, CancelDisplay As Boolean)
    If Number = 10061 Then m_blnNoEcho = True
End Sub