frmclient.frm

关于WINSOCK控件基本编程的例程,提供电子邮件例程

VERSION 5.00
Object = "{248DD890-BB45-11CF-9ABC-0080C7E7B78D}#1.0#0"; "MSWINSCK.OCX"
Object = "{F9043C88-F6F2-101A-A3C9-08002B2F49FB}#1.2#0"; "COMDLG32.OCX"
Begin VB.Form frmClient 
   BackColor       =   &H80000000&
   BorderStyle     =   4  'Fixed ToolWindow
   Caption         =   "文件传输－客户"
   ClientHeight    =   4500
   ClientLeft      =   30
   ClientTop       =   330
   ClientWidth     =   5400
   BeginProperty Font 
      Name            =   "Times New Roman"
      Size            =   9
      Charset         =   0
      Weight          =   400
      Underline       =   0   'False
      Italic          =   0   'False
      Strikethrough   =   0   'False
   EndProperty
   LinkTopic       =   "Form1"
   MaxButton       =   0   'False
   MinButton       =   0   'False
   ScaleHeight     =   4500
   ScaleWidth      =   5400
   ShowInTaskbar   =   0   'False
   Begin VB.CommandButton cmdClear 
      Caption         =   "清除"
      Height          =   252
      Left            =   4320
      TabIndex        =   10
      Top             =   3840
      Width           =   972
   End
   Begin VB.TextBox txtView 
      Height          =   1332
      Left            =   50
      MultiLine       =   -1  'True
      ScrollBars      =   2  'Vertical
      TabIndex        =   8
      Top             =   2400
      Width           =   5292
   End
   Begin VB.CommandButton cmdDisconnect 
      Caption         =   "断开"
      Height          =   375
      Left            =   240
      TabIndex        =   7
      Top             =   1320
      Width           =   1095
   End
   Begin VB.CommandButton cmdConnect 
      Caption         =   "连接"
      Height          =   375
      Left            =   240
      TabIndex        =   6
      Top             =   840
      Width           =   1095
   End
   Begin VB.CommandButton cmdSend 
      Caption         =   "发送"
      Height          =   375
      Left            =   2640
      TabIndex        =   5
      Top             =   840
      Width           =   1095
   End
   Begin VB.CommandButton cmdBrowse 
      Caption         =   "浏览"
      Height          =   375
      Left            =   4200
      TabIndex        =   4
      Top             =   360
      Width           =   972
   End
   Begin VB.TextBox txtFileName 
      Height          =   300
      Left            =   120
      TabIndex        =   2
      Top             =   360
      Width           =   3615
   End
   Begin MSWinsockLib.Winsock tcpClient 
      Left            =   4440
      Top             =   120
      _ExtentX        =   741
      _ExtentY        =   741
      _Version        =   393216
   End
   Begin MSComDlg.CommonDialog cdOpen 
      Left            =   4800
      Top             =   120
      _ExtentX        =   688
      _ExtentY        =   688
      _Version        =   393216
   End
   Begin VB.CommandButton cmdClose 
      Caption         =   "关闭"
      Height          =   375
      Left            =   2640
      TabIndex        =   0
      Top             =   1320
      Width           =   1095
   End
   Begin VB.Label Label1 
      AutoSize        =   -1  'True
      BackStyle       =   0  'Transparent
      Caption         =   "文件传递监视："
      ForeColor       =   &H80000007&
      Height          =   225
      Left            =   120
      TabIndex        =   9
      Top             =   2160
      Width           =   1260
   End
   Begin VB.Label Label3 
      AutoSize        =   -1  'True
      BackStyle       =   0  'Transparent
      Caption         =   "要发送文件："
      ForeColor       =   &H80000008&
      Height          =   225
      Index           =   0
      Left            =   120
      TabIndex        =   3
      Top             =   120
      Width           =   1080
   End
   Begin VB.Label lblStatus 
      BorderStyle     =   1  'Fixed Single
      Caption         =   " 状态：没有连接"
      Height          =   252
      Left            =   48
      TabIndex        =   1
      Top             =   4200
      Width           =   5292
   End
End
Attribute VB_Name = "frmClient"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = False
Option Explicit

Private Sub cmdClear_Click()
    txtView = ""
    txtFileName = ""
End Sub

Private Sub cmdClose_Click()
    End
End Sub

Private Sub cmdConnect_Click()
    bReplied = False
    tcpClient.Connect "127.0.0.1", 2001
    lTIme = 0
    While (Not bReplied) And (lTIme < 100000)
        DoEvents
        lTIme = lTIme + 1
    Wend
    If lTIme >= 100000 Then
        MsgBox "不能连接到服务器！", vbCritical, "连接错误"
        tcpClient.Close
        Exit Sub
    End If
End Sub

Private Sub cmdDisconnect_Click()
    tcpClient.Close
    Form_Load
End Sub

Private Sub cmdSend_Click()
    Dim FName_Only As String
    
    If txtFileName = "" Then
       MsgBox "没有选择文件", vbCritical
    Else ' 发送文件
       If tcpClient.State <> sckClosed Then
          FName_Only$ = GetFileName(txtFileName)
          SendFile FName_Only$
       End If
    End If
End Sub

Private Sub Form_Load()
    Status "Disconnected."
    bReplied = False
End Sub
Private Sub tcpClient_Close()
    If tcpClient.State <> sckClosed Then tcpClient.Close
End Sub
Private Sub tcpClient_DataArrival(ByVal bytesTotal As Long)
    Dim Command      As String
    Dim NewArrival   As String
    Dim Data         As String
    Static DataCnt   As Long
    
    tcpClient.GetData NewArrival$, vbString
    Command$ = EvalData(NewArrival$, 1)
    Data$ = EvalData(NewArrival$, 2)
    Select Case Command
        Case "Accepted"       '服务器接收连接
             bReplied = True
             Status "已经连接"
        Case "ServerClosed"   '服务器关闭
             Form_Load
             tcpClient.Close
             
        Case "OpenFile"  ' 打开文件
           Dim Fname As String
           Fname$ = App.Path & "\" & Data$
           Open Fname$ For Binary As #1
           Status "打开文件…" & Data$
               
        Case "CloseFile" ' 关闭文件
           ' 文件传递完毕
           Close #1
           Status "文件传递完毕…"
           Pause 3000
           Status "已经连接"
        Case Else '写入文件
           Put #1, , NewArrival$
           txtView = txtView & NewArrival$
           DataCnt& = DataCnt& + 1
           Status "获得文件中…" & (MAX_CHUNK * DataCnt&) & " bytes"
            
    End Select
    
End Sub

Private Sub cmdBrowse_Click()
    cdOpen.ShowOpen
    If Not vbCancel Then
       txtFileName = cdOpen.FileName
    End If
End Sub