frmlogin.frm

数据结构是计算机学科的一门核心课程。数据结构课程的 任务是讨论现实世界中数据的各种逻辑结构、在计算机中的存 储结构以及实现各种操作的算法等问题。掌握如何组织数据、 如何存储数据和如何处理数据的基

VERSION 5.00
Begin VB.Form FrmLogin 
   BackColor       =   &H80000013&
   BorderStyle     =   3  'Fixed Dialog
   Caption         =   "《数据结构》算法速查器"
   ClientHeight    =   3720
   ClientLeft      =   45
   ClientTop       =   330
   ClientWidth     =   5475
   LinkTopic       =   "Form1"
   MaxButton       =   0   'False
   MinButton       =   0   'False
   ScaleHeight     =   3720
   ScaleWidth      =   5475
   ShowInTaskbar   =   0   'False
   StartUpPosition =   3  '窗口缺省
   Begin VB.CommandButton Cmd_AddUser 
      Caption         =   "注册向导"
      Height          =   375
      Left            =   4200
      TabIndex        =   9
      Top             =   3240
      Width           =   1215
   End
   Begin VB.CommandButton Cmd_Cancel 
      Caption         =   "取消"
      Height          =   375
      Left            =   3120
      TabIndex        =   8
      Top             =   3240
      Width           =   855
   End
   Begin VB.CommandButton Cmd_Ok 
      BackColor       =   &H00C0C0C0&
      Caption         =   "登录"
      Default         =   -1  'True
      Height          =   375
      Left            =   2040
      TabIndex        =   7
      Top             =   3240
      Width           =   855
   End
   Begin VB.Frame Frame1 
      BackColor       =   &H00FFFFFF&
      Caption         =   "信息录入"
      ForeColor       =   &H00FF0000&
      Height          =   1815
      Left            =   120
      TabIndex        =   1
      Top             =   1200
      Width           =   5295
      Begin VB.CommandButton Cmd_Refresh 
         Caption         =   "刷新"
         Height          =   375
         Left            =   4440
         TabIndex        =   6
         Top             =   360
         Width           =   615
      End
      Begin VB.TextBox Txt_Pwd 
         Height          =   390
         IMEMode         =   3  'DISABLE
         Left            =   1440
         PasswordChar    =   "*"
         TabIndex        =   3
         Top             =   1080
         Width           =   2655
      End
      Begin VB.TextBox Txt_ID 
         Height          =   390
         Left            =   1440
         TabIndex        =   2
         Top             =   345
         Width           =   2655
      End
      Begin VB.Label Label3 
         AutoSize        =   -1  'True
         BackColor       =   &H00FFFFFF&
         Caption         =   "密  码："
         BeginProperty Font 
            Name            =   "宋体"
            Size            =   10.5
            Charset         =   134
            Weight          =   700
            Underline       =   0   'False
            Italic          =   0   'False
            Strikethrough   =   0   'False
         EndProperty
         Height          =   210
         Left            =   240
         TabIndex        =   5
         Top             =   1200
         Width           =   915
      End
      Begin VB.Label Label2 
         AutoSize        =   -1  'True
         BackColor       =   &H00FFFFFF&
         Caption         =   "用户ID："
         BeginProperty Font 
            Name            =   "宋体"
            Size            =   10.5
            Charset         =   134
            Weight          =   700
            Underline       =   0   'False
            Italic          =   0   'False
            Strikethrough   =   0   'False
         EndProperty
         Height          =   210
         Left            =   240
         TabIndex        =   4
         Top             =   480
         Width           =   915
      End
   End
   Begin VB.Label Label1 
      AutoSize        =   -1  'True
      BackColor       =   &H00FF0000&
      Caption         =   "登录"
      BeginProperty Font 
         Name            =   "方正姚体"
         Size            =   21.75
         Charset         =   134
         Weight          =   400
         Underline       =   0   'False
         Italic          =   0   'False
         Strikethrough   =   0   'False
      EndProperty
      ForeColor       =   &H00FFFFFF&
      Height          =   495
      Left            =   600
      TabIndex        =   0
      Top             =   480
      Width           =   870
   End
   Begin VB.Image Image1 
      Height          =   1065
      Left            =   0
      Picture         =   "FrmLogin.frx":0000
      Stretch         =   -1  'True
      Top             =   0
      Width           =   5505
   End
End
Attribute VB_Name = "FrmLogin"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = False
Public IDkey As String
Public PasswordKey As String
Public Try_times As Integer


Private Sub Form_Load()
  '置中窗体
  Me.Move (Screen.Width - Me.Width) / 2, (Screen.Height - Me.Height) / 2
End Sub

Private Sub Cmd_Refresh_Click()
  Txt_ID.Text = ""
  Txt_Pwd.Text = ""
  Txt_ID.SetFocus
End Sub

Private Sub Cmd_Ok_Click()
  Dim j As Single
  '数据有效性检查
  If Txt_ID = "" Then
    MsgBox "请输入用户名", , "提示"
    Txt_ID.SetFocus
    Exit Sub
  End If
  If Txt_Pwd = "" Then
    MsgBox "请输入密码", , "提示"
    Txt_Pwd.SetFocus
    Exit Sub
  End If
  IDkey = MakeStr(Txt_ID)
  PasswordKey = MakeStr(Txt_Pwd)
  '判断用户是否存在
  If MyUser.In_DB(IDkey) = False Then
    MsgBox "用户名不存在"
    Txt_ID.SetFocus
    Try_times = Try_times + 1
    If Try_times >= 3 Then
      MsgBox "您已经三次尝试进入本系统，均不成功，系统将关闭", , "提示"
      DBapi_Disconnect
      Unload FrmMain
      End
    Else
      Exit Sub
    End If
  End If
  '判断密码是否正确
  MyUser.GetInfo (IDkey)
  If MyUser.PWD <> PasswordKey Then
    MsgBox "密码错误"
    Txt_Pwd.SetFocus
    Try_times = Try_times + 1
    If Try_times >= 3 Then
      MsgBox "您已经三次尝试进入本系统，均不成功，系统将关闭", , "提示"
      DBapi_Disconnect
      Unload FrmMain
      End
    Else
      Exit Sub
    End If
  End If
  '登录成功,保存当前用户ID
  now = IDkey
  
  '如果以管理员身份（hjs）登录时，设置“菜单栏”中的“删除用户（DelUser）”选项为可见
  If now = "hjs" Then
  FrmMain.DelUser.Visible = True
  End If
  
  '关闭自己
  Unload Me
  FrmMain.Show
  frmtip.Show
End Sub

Private Sub Cmd_Cancel_Click()
  Unload FrmMain
  End
End Sub

Private Sub Cmd_AddUser_Click()
  Unload Me
  FrmAddUser.Show
End Sub