frmlogin.frm

电脑销售管理系统是典型的信息管理系统（MIS）

VERSION 5.00
Begin VB.Form frmlogin 
   BorderStyle     =   1  'Fixed Single
   Caption         =   "身份验证"
   ClientHeight    =   2130
   ClientLeft      =   45
   ClientTop       =   330
   ClientWidth     =   4020
   ControlBox      =   0   'False
   Icon            =   "frmlogin.frx":0000
   LinkTopic       =   "Form1"
   MaxButton       =   0   'False
   MouseIcon       =   "frmlogin.frx":030A
   ScaleHeight     =   2130
   ScaleWidth      =   4020
   StartUpPosition =   2  '屏幕中心
   Begin VB.CommandButton Cmd_Cancel 
      Caption         =   "取消"
      Height          =   400
      Left            =   2115
      MouseIcon       =   "frmlogin.frx":0614
      MousePointer    =   99  'Custom
      TabIndex        =   6
      Top             =   1560
      Width           =   1300
   End
   Begin VB.CommandButton cmd_ok 
      Caption         =   "确定"
      Height          =   400
      Left            =   432
      MouseIcon       =   "frmlogin.frx":091E
      MousePointer    =   99  'Custom
      TabIndex        =   5
      Top             =   1560
      Width           =   1300
   End
   Begin VB.Frame Frame1 
      Height          =   1215
      Left            =   240
      TabIndex        =   2
      Top             =   120
      Width           =   3495
      Begin VB.TextBox txtpwd 
         Height          =   270
         IMEMode         =   3  'DISABLE
         Left            =   1080
         MaxLength       =   20
         PasswordChar    =   "*"
         TabIndex        =   1
         ToolTipText     =   "输入密码，不超过20个字符"
         Top             =   795
         Width           =   2175
      End
      Begin VB.TextBox txtuser 
         Height          =   270
         Left            =   1080
         MaxLength       =   20
         TabIndex        =   0
         ToolTipText     =   "输入用户名，不超过20个字符"
         Top             =   315
         Width           =   2175
      End
      Begin VB.Label Label2 
         Caption         =   "密  码"
         Height          =   180
         Left            =   240
         TabIndex        =   4
         Top             =   840
         Width           =   540
      End
      Begin VB.Label Label1 
         Caption         =   "用户名"
         Height          =   255
         Left            =   240
         TabIndex        =   3
         Top             =   360
         Width           =   540
      End
   End
End
Attribute VB_Name = "frmlogin"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = False
Public PasswordKey As String     '保存密码
Public NameKey As String         '保存用户名
Public Try_times As Integer      '记录尝试登陆的次数



Private Sub Cmd_Cancel_Click()
  End
End Sub

Private Sub Cmd_OK_Click()
  Dim j As Single

'数据有效性检查
  If txtuser = "" Then
    MsgBox "请输入用户名"
    txtuser.SetFocus
    Exit Sub
  End If
  If txtpwd = "" Then
    MsgBox "请输入密码"
    txtpwd.SetFocus
    Exit Sub
  End If
 
  NameKey = MakeStr(txtuser)
  PasswordKey = MakeStr(txtpwd)
   
'判断用户是否存在
  If MyUser.In_DB(NameKey) = False Then
    MsgBox "用户名不存在"
    Try_times = Try_times + 1
    If Try_times >= 3 Then
      MsgBox "您已经3次尝试进入本系统，均不成功，系统将关闭"
      DBapi_Disconnect
      End
    Else
      Exit Sub
    End If
  End If

'判断密码是否正确
  MyUser.GetInfo (NameKey)
  If MyUser.Pwd <> PasswordKey Then
    MsgBox "密码错误"
    Try_times = Try_times + 1
    If Try_times >= 3 Then
      MsgBox "您已经3次尝试进入本系统，均不成功，系统将关闭"
      DBapi_Disconnect
      End
    Else
      Exit Sub
    End If
  End If
  
'登录成功，将当前用户的信息保存在CurUser中
  CurUser.GetInfo (MyUser.UserName)
'关闭窗体
  Unload Me
End Sub