frmcheckmailonly.frm

vb发送文件,检查邮件,串口操作,查看文件等关于socket的源代码!

VERSION 5.00
Object = "{248DD890-BB45-11CF-9ABC-0080C7E7B78D}#1.0#0"; "MSWINSCK.OCX"
Begin VB.Form FrmCheckMailOnly 
   Caption         =   "检测Pop3信箱是否有信"
   ClientHeight    =   2520
   ClientLeft      =   1785
   ClientTop       =   2355
   ClientWidth     =   7035
   LinkTopic       =   "Form1"
   ScaleHeight     =   2520
   ScaleWidth      =   7035
   Begin VB.CommandButton cmdCheck 
      Caption         =   "开始检测"
      Height          =   510
      Left            =   5175
      TabIndex        =   7
      Top             =   675
      Width           =   1215
   End
   Begin VB.TextBox txtPassword 
      Height          =   330
      IMEMode         =   3  'DISABLE
      Left            =   2400
      PasswordChar    =   "*"
      TabIndex        =   6
      Text            =   "123"
      Top             =   1800
      Width           =   2565
   End
   Begin VB.TextBox txtUser 
      Height          =   330
      Left            =   2400
      TabIndex        =   5
      Text            =   "abc"
      Top             =   1305
      Width           =   2565
   End
   Begin VB.TextBox txtPOP3 
      Height          =   330
      Left            =   2400
      TabIndex        =   1
      Text            =   "pop.sina.com"
      Top             =   765
      Width           =   2565
   End
   Begin MSWinsockLib.Winsock Winsck 
      Left            =   450
      Top             =   990
      _ExtentX        =   741
      _ExtentY        =   741
      _Version        =   393216
   End
   Begin VB.Label Label2 
      AutoSize        =   -1  'True
      Caption         =   "口令："
      Height          =   180
      Index           =   2
      Left            =   1800
      TabIndex        =   4
      Top             =   1890
      Width           =   540
   End
   Begin VB.Label Label2 
      AutoSize        =   -1  'True
      Caption         =   "用户名："
      Height          =   180
      Index           =   1
      Left            =   1650
      TabIndex        =   3
      Top             =   1395
      Width           =   720
   End
   Begin VB.Label Label2 
      AutoSize        =   -1  'True
      Caption         =   "POP3 SERVER："
      Height          =   180
      Index           =   0
      Left            =   1200
      TabIndex        =   2
      Top             =   855
      Width           =   1170
   End
   Begin VB.Label lblTip 
      AutoSize        =   -1  'True
      Caption         =   "仅检测指定的信箱中是否有信"
      Height          =   180
      Left            =   375
      TabIndex        =   0
      Top             =   315
      Width           =   2340
   End
End
Attribute VB_Name = "FrmCheckMailOnly"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = False
Option Explicit

Private Sub cmdCheck_Click()
    With Me.Winsck
        .RemoteHost = Me.txtPOP3
        .RemotePort = 110
        .Connect
    End With
End Sub

Private Sub Winsck_DataArrival(ByVal bytesTotal As Long)
    Static sStep As String  ' 当前的步骤
    Dim sCmd As String
    Dim sBuff As String
    Dim I As Integer, Ct As Integer
    
    Call Me.Winsck.GetData(sBuff)   ' 读取返回的信息
    
    If Left(sBuff, 1) = "+" Or Left(sBuff, 1) = "-" Then    ' +成功；-失败
        Select Case Left(sBuff, 3)
        Case "+OK"
            Select Case sStep
            Case ""                 ' 第一步：认证
                sCmd = "USER " & Me.txtUser & vbCrLf
                Me.Winsck.SendData sCmd
                sStep = "USER"
            Case "USER"
                sCmd = "PASS " & Me.txtPassword & vbCrLf
                Me.Winsck.SendData sCmd
                sStep = "PASS"
            Case "PASS"             ' PASS命令的返回格式为“+OK username has nnn messages(s).”
                sBuff = UCase(sBuff)
                I = InStr(sBuff, "HAS")
                sBuff = Mid(sBuff, I + 3)
                I = InStr(sBuff, " ")
                Ct = CInt(Trim(Left(sBuff, I - 1)))
                Me.lblTip.Caption = "提示：有" & Ct & "封信"
                sStep = "WAIT"
            Case "QUIT"
                sStep = "QUIT"
                Me.Winsck.Close
            End Select
        Case "-ERR"
            Me.lblTip.Caption = "出错：" & sBuff
            sCmd = "QUIT" & vbCrLf
            Me.Winsck.SendData sCmd ' 出错，则关闭端口返回
            sStep = "QUIT"
        End Select
        
    Else
        ' 忽略其他命令
    End If
    
End Sub