[置顶] 学生信息管理系统之优化处理

新阳师傅验收一遍完系统之后指出了很多需要改正的地方，旨在让用户用起来更简单快捷。在这里我的小伙伴晓蝉也帮了我很大的忙。此致感谢！

一、登陆界面的优化：

原先的界面如上图所示，太过普通。模仿QQ、飞信得出如下界面。

优化的主要功能:除了界面所展示以外还有要求账号只能为数字或字母，限制字数。Enter键和Tab键的使用。代码如下：

<span style="font-size:14px;"><span style="font-size:24px;">'只能输入字母和数字
Private Sub txtusername_KeyPress(KeyAscii As Integer)
If (KeyAscii >= 48 And KeyAscii <= 57) Or (KeyAscii >= 65 And KeyAscii <= 90) Or (KeyAscii >= 97 And KeyAscii <= 122) Or (KeyAscii = 8) Then
  Else
  MsgBox "用户名由字母和数字组成", vbOKOnly + vbExclamation, "警告"
  KeyAscii = 0
  End If
End Sub
'限制输入的字符长度为6-16之间
Private Sub txtusername_LostFocus()
    If Not Len(txtUserName) = 0 And Len(txtUserName) < 6 Or Len(txtUserName) > 16 Then
        MsgBox "用户名和密码由6-16个字母和数字组成"
        txtUserName.SelLength = Len(txtUserName.Text)
        txtUserName.SelStart = 0
        txtUserName.SetFocus
    End If   
   If txtUserName = "" Then
        txtUserName.Text = "请输入帐号"
        txtUserName.ForeColor = RGB(128, 128, 128)
    End If
End Sub

Private Sub txtusername_GotFocus()
    If txtUserName = "请输入帐号" Then
        txtUserName.Text = ""
        txtUserName.ForeColor = RGB(0, 0, 0)
    End If
End Sub

Private Sub Txtpassword_LostFocus()
    If txtPassword = "" Then
        txtPassword.Text = "请输入密码"
        txtPassword.PasswordChar = ""
        txtPassword.ForeColor = RGB(128, 128, 128)
    End If
End Sub

Private Sub Txtpassword_GotFocus()
    If txtPassword = "请输入密码" Then
        txtPassword.Text = ""
        txtPassword.PasswordChar = "*"
        txtPassword.ForeColor = RGB(0, 0, 0)
    End If
End Sub</span></span>

二、如图优化功能：学号只能为数字，姓名为汉字或字母功能优化。日期格式功能的优化，限制入校日期和出生日期不能为同一天以及Enter键和Esc键的使用。

<pre name="code" class="vb"><span style="font-size:14px;"><span style="font-size:14px;"><span style="font-size:24px;">Private Sub txtborndate_Change()
    Dim Lenth As Byte
    Lenth = Len(txtBorndate)
    If Lenth = 4 Or Lenth = 7 Then
        txtBorndate = txtBorndate & "-"
        txtBorndate.SelStart = Lenth + 1
    End If   
End Sub

Private Sub txtBorndate_GotFocus()
    If txtBorndate.Text = "yyyy-mm-dd" Then
        txtBorndate.Text = ""
        txtBorndate.ForeColor = RGB(0, 0, 0)
    End If
End Sub

Private Sub txtborndate_KeyPress(KeyAscii As Integer)
    If KeyAscii = 8 Then
        If Right(txtBorndate, 1) = "-" Then
            txtBorndate = Left(txtBorndate, Abs(Len(txtBorndate) - 2))
            KeyAscii = 0
            txtBorndate.SelStart = Len(txtBorndate)
        End If
    ElseIf Len(txtBorndate) >= 10 Then
        KeyAscii = 0
    ElseIf KeyAscii < 48 Or KeyAscii > 57 Then
        KeyAscii = 0
    End If
End Sub

Private Sub txtBorndate_LostFocus()
    If txtBorndate.Text = "" Then
        txtBorndate.Text = "yyyy-mm-dd"
        txtBorndate.ForeColor = RGB(128, 128, 128)
    End If
End Sub

Private Sub txtrudate_Change()
    Dim Lenth As Byte
    Lenth = Len(txtRudate)
    If Lenth = 4 Or Lenth = 7 Then
        txtRudate = txtRudate & "-"
        txtRudate.SelStart = Lenth + 1
    End If
End Sub

Private Sub txtRudate_GotFocus()
    If txtRudate.Text = "yyyy-mm-dd" Then
        txtRudate.Text = ""
        txtRudate.ForeColor = RGB(0, 0, 0)
    End If
End Sub

Private Sub txtrudate_KeyPress(KeyAscii As Integer)
    If KeyAscii = 8 Then
        If Right(txtRudate, 1) = "-" Then
            txtRudate = Left(txtRudate, Abs(Len(txtRudate) - 2))
            KeyAscii = 0
            txtRudate.SelStart = Len(txtRudate)
        End If
    ElseIf Len(txtRudate) >= 10 Then
        KeyAscii = 0
    ElseIf KeyAscii < 48 Or KeyAscii > 57 Then
        KeyAscii = 0
    End If
End Sub

'设置姓名字节的限制，由2个到4个字组成，即4-8个字节组成
Private Sub txtname_LostFocus()
    If Not LenB(txtName) = 0 And LenB(txtName) < 4 Or LenB(txtName) > 8 Then
        txtName.SetFocus
        txtName.SelLength = Len(txtName.Text)
        txtName.SelStart = 0
        MsgBox "姓名输入错误"
    End If
End Sub

'不能输入数字
Private Sub Txtname_KeyPress(KeyAscii As Integer)
    If (KeyAscii >= 48 And KeyAscii <= 57) Then
        MsgBox "不允许输入数字", vbOKOnly + vbExclamation, "警告"
        KeyAscii = 0        '键盘不能用
    End If
End Sub

Private Sub txtRudate_LostFocus()
    If txtRudate.Text = "" Then
        txtRudate.Text = "yyyy-mm-dd"
        txtRudate.ForeColor = RGB(128, 128, 128)
    End If
End Sub

'限制text中只能输入数字
Private Sub txtsid_KeyPress(KeyAscii As Integer)
    If KeyAscii < 48 Or KeyAscii > 57 Then
    MsgBox "学号由数字组成！", vbOKOnly + vbExclamation, "警告"
    KeyAscii = 0
    End If
End Sub

日期不能为同一天的功能代码展示： 
 '入学日期和出生日期不能同一天
    If txtBorndate = txtRudate Then
        MsgBox "出生日期和入学日期不能同一天", vbOKOnly + vbExclamation, "警告"
        txtRudate.SetFocus
        Exit Sub
    End If</span></span></span>

三、如图优化功能：本着全心全意为人民服务的宗旨，按钮需要的时候能用，不需要的时候不能用；Enter键和Esc键的使用；不重复添加。

 <span style="font-size:14px;">'添加课程之前确认是否列表中已有课程
    Dim intindex1 As Integer
    Dim intindex2 As Integer
    With listSelectcourse
        For intindex1 = 0 To .ListCount - 1
            For intindex2 = .ListCount - 1 To intindex1 + 1 Step -1
                If .List(intindex2) = .List(intindex1) Then
                    .RemoveItem intindex2
                End If
            Next intindex2
        Next intindex1
     End With</span>

<span style="font-size:14px;"><span style="font-size:24px;">listAllcourse.Enabled = True
listSelectcourse.Enabled = True
cmdAdd.Enabled = True
cmdDelete.Enabled = True
cmdModify.Enabled = True
cmdSet.Enabled = False</span></span>

四、如图优化功能：Check前对号取消的时候后面的内容随之取消。

<span style="font-size:14px;"><span style="font-size:24px;">Private Sub Check1_Click(Index As Integer)
    If Not Check1(0).Value Then
        txtSID.Text = ""
    End If
    If Not Check1(1).Value Then
        txtName.Text = ""
    End If
    If Not Check1(2).Value Then
        txtClassno.Text = ""
    End If
End Sub</span></span>

五、错误处理：当记录为空时便会出现这样的错误。

<span style="font-size:14px;"><span style="font-size:24px;"> '添加错误处理
    txtSQL = "select * from course_Info"
    Set mrc = ExecuteSQL(txtSQL, MsgText)       '得到student表，并显示出来
    On Error GoTo dateErr  '如果有错误直接执行dateErr那一步
    mrc.MoveFirst       '
    Call viewData
    myBookmark = mrc.Bookmark
    mcclean = True
dateErr:
     If Err = 3021 Then
         MsgBox "没有数据", vbOKOnly + vbExclamation, "警告"
    End If</span></span>

六、MDI子窗体运行时窗体大小会变，需要对其进行设置大小。

<span style="font-size:14px;"><span style="font-size:24px;">Me.Height = 5625
Me.Width = 6720</span></span>

七、功能优化杂项：警告和弹出式提醒，控件的大小和排版格式，设置功能和属性引导客户正确便捷地使用软件。