frmcnn.frm

<Visual Basic 数据库开发实例精粹（第二版）>一书首先介绍了Visual Basic(简称VB)开发的技巧和重点技术

VERSION 5.00
Begin VB.Form FrmCnn 
   BackColor       =   &H00D9722D&
   BorderStyle     =   1  'Fixed Single
   Caption         =   "连接服务器"
   ClientHeight    =   2070
   ClientLeft      =   5700
   ClientTop       =   4260
   ClientWidth     =   4080
   LinkTopic       =   "Form2"
   MaxButton       =   0   'False
   MDIChild        =   -1  'True
   ScaleHeight     =   2070
   ScaleWidth      =   4080
   Begin VB.TextBox TextSvrIP 
      Height          =   375
      Left            =   1680
      TabIndex        =   6
      Text            =   "127.0.0.1"
      Top             =   1080
      Width           =   2295
   End
   Begin VB.CommandButton CmdCancel 
      Cancel          =   -1  'True
      Caption         =   "取消"
      Height          =   375
      Left            =   2640
      TabIndex        =   5
      Top             =   1560
      Width           =   1095
   End
   Begin VB.CommandButton CmdCnn 
      Caption         =   "连接"
      Default         =   -1  'True
      Height          =   375
      Left            =   1320
      TabIndex        =   4
      Top             =   1560
      Width           =   1095
   End
   Begin VB.TextBox TextPwd 
      Height          =   375
      IMEMode         =   3  'DISABLE
      Left            =   1680
      PasswordChar    =   "*"
      TabIndex        =   3
      Top             =   600
      Width           =   2295
   End
   Begin VB.TextBox TextUser 
      Height          =   375
      Left            =   1680
      TabIndex        =   2
      Top             =   120
      Width           =   2295
   End
   Begin VB.Label LabelIP 
      BackStyle       =   0  'Transparent
      Caption         =   "服务器IP："
      BeginProperty Font 
         Name            =   "楷体_GB2312"
         Size            =   14.25
         Charset         =   134
         Weight          =   700
         Underline       =   0   'False
         Italic          =   0   'False
         Strikethrough   =   0   'False
      EndProperty
      ForeColor       =   &H00FFFFFF&
      Height          =   255
      Left            =   120
      TabIndex        =   7
      Top             =   1080
      Width           =   1695
   End
   Begin VB.Label LabelPwd 
      Alignment       =   1  'Right Justify
      BackStyle       =   0  'Transparent
      Caption         =   "密码："
      BeginProperty Font 
         Name            =   "楷体_GB2312"
         Size            =   14.25
         Charset         =   134
         Weight          =   700
         Underline       =   0   'False
         Italic          =   0   'False
         Strikethrough   =   0   'False
      EndProperty
      ForeColor       =   &H00FFFFFF&
      Height          =   375
      Left            =   720
      TabIndex        =   1
      Top             =   600
      Width           =   975
   End
   Begin VB.Label LabelUser 
      BackStyle       =   0  'Transparent
      Caption         =   "管理员ID："
      BeginProperty Font 
         Name            =   "楷体_GB2312"
         Size            =   14.25
         Charset         =   134
         Weight          =   700
         Underline       =   0   'False
         Italic          =   0   'False
         Strikethrough   =   0   'False
      EndProperty
      ForeColor       =   &H00FFFFFF&
      Height          =   255
      Left            =   120
      TabIndex        =   0
      Top             =   120
      Width           =   2055
   End
End
Attribute VB_Name = "FrmCnn"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = False
Option Explicit

Private Sub CmdCancel_Click()   '取消
    Unload Me
End Sub

'连接服务器
Private Sub CmdCnn_Click()
    '检验输入内容并存入内存
    If Len(Trim(Me.TextUser.Text)) <= 0 Then    '用户名
        MsgBox "请输入用户ID！"
        Exit Sub
    ElseIf Len(Trim(Me.TextUser.Text)) > 16 Then
        MsgBox "您输入的用户ID过长！"
        Exit Sub
    Else    '输入正确
        UserNow.ID = Trim(Me.TextUser.Text)
    End If
    
    If Len(Trim(Me.TextPwd.Text)) <= 0 Then '密码
        MsgBox "请输入密码！"
        Exit Sub
    ElseIf Len(Trim(Me.TextPwd.Text)) > 16 Then
        MsgBox "您输入的密码过长！"
        Exit Sub
    Else    '输入正确
        UserNow.Pwd = Trim(Me.TextPwd.Text)
    End If
    
     If Len(Trim(Me.TextSvrIP.Text)) <= 0 Then  'IP
        MsgBox "请输入服务器IP！"
        Exit Sub
    ElseIf Len(Trim(Me.TextSvrIP.Text)) > 15 Then
        MsgBox "您输入的IP地址过长！"
        Exit Sub
    ElseIf Len(Trim(Me.TextSvrIP.Text)) < 7 Then
        MsgBox "您输入的IP地址过短！"
        Exit Sub
    Else    '输入正确
        '设置服务器IP，端口
        MDIFrm.SockToSvr.RemoteHost = Trim(Me.TextSvrIP.Text)
        MDIFrm.SockToSvr.RemotePort = 1234
        '连接服务器
        MDIFrm.SockToSvr.Connect
        '在状态栏显示服务器连接状态
        MDIFrm.StatusBar1.Panels(1).Text = "服务器连接状态：正在连接…"
        '退出本窗口
        Unload Me
    End If
         
End Sub

Private Sub Form_Load()
    '检验sock状态，如果正在连接则关闭原连接，以便建立新连接
    If MDIFrm.SockToSvr.State <> sckClosed Then
        MDIFrm.SockToSvr.Close
    End If
End Sub