请教键盘响应的问题急！

WisdomBoy 2002-11-20 11:48:44

用简单的计算器作例子，我现在想实现键盘响应（0,1,2,3,4,5,6,7,8,9,.,+,-,/,*,=)
能否帮忙在以下例子中完善实现键盘响应的操作.

Option Explicit

Dim UserName As String
Dim Op1, Op2 ' 预先输入操作数
Dim PointFlag As Boolean ' 小数点存在吗？
Dim NumOps As Integer ' 操作数个数
Dim LastInput ' 指示上一次按键事件的类型
Dim OpFlag ' 指示未完成的操作
Dim TempReadout

' C (取消) 按钮的 Click 事件过程
' 重新设置显示并初始化变量。
Private Sub Cancel_Click()

Readout = Format(0, "0.")
Op1 = 0
Op2 = 0
PointFlag = False
NumOps = 0
LastInput = "NONE"
OpFlag = ""
Readout = Format(0, "0.")

End Sub

' CE (取消输入) 按钮的 Click 事件过程
Private Sub CancelEntry_Click()

Readout = Format(0, "0.")
PointFlag = False
LastInput = "CE"

End Sub

' 小数点 (.) 按钮的 Click 事件过程
' 如果上一次按键为运算符，初始化 readout 为 "0."；
' 否则显示时追加一个小数点。
Private Sub cmdPoint_Click()

If LastInput <> "NUMS" Then
Readout = Format(0, "0.")
End If
PointFlag = True
LastInput = "NUMS"

End Sub

' 窗体的初始化过程
' 设置所有变量为其初始值
Private Sub Form_Load()

UserName = InputBox("请输入您的姓名 ^-^", "姓名", "张三", 2000, 2000)
Form1.Caption = UserName

End Sub

'改变数字的正负号
Private Sub ChangeFlag_Click()

If LastInput <> "OPS" Or OpFlag = "=" Then
If Left(Readout, 1) <> "-" Then
Readout = "-" & Readout
Else
Readout = Right(Readout, Len(Readout) - 1)
End If
End If

End Sub

' 数字键 (0-9) 的 Click 事件过程
' 向显示中的数追加新数
Private Sub Number_Click(index As Integer)

If LastInput <> "NUMS" Then
Readout = Format(0, ".")
PointFlag = False
End If
If PointFlag Then
Readout = Readout + Number(index).Caption
Else
Readout = Left(Readout, InStr(Readout, Format(0, ".")) - 1) + Number(index).Caption + Format(0, ".")
End If
LastInput = "NUMS"

End Sub

' 运算符 (+, -, x, /, =) 的 Click 事件过程
' 如果接下来的按键是数字键，增加 NumOps。
' 如果有一个操作数，则设置 Op1。
' 如果有两个操作数，则将 Op1 设置为 Op1 与
' 当前输入字符串的运算结果，并显示结果。
Private Sub Operator_Click(index As Integer)

TempReadout = Readout
If LastInput <> "OPS" Then
NumOps = NumOps + 1
End If
Select Case NumOps
Case 0
'什么也不做
Case 1
Op1 = Readout
Case 2
Op2 = TempReadout
Select Case OpFlag
Case "+"
Op1 = CDbl(Op1) + CDbl(Op2)
Case "-"
Op1 = CDbl(Op1) - CDbl(Op2)
Case "*"
Op1 = CDbl(Op1) * CDbl(Op2)
Case "/"
If Op2 = 0 Then
MsgBox "除数不能为零", 48, "计算器"
Else
Op1 = CDbl(Op1) / CDbl(Op2)
End If
Case "="
Op1 = CDbl(Op2)
Case "%'"
Op1 = CDbl(Op1) * CDbl(Op2)
End Select
Readout = Op1
NumOps = 1
End Select
LastInput = "OPS"
OpFlag = Operator(index).Caption

End Sub

' 百分比键 (%) 的 Click 事件过程
Private Sub Percent_Click()

If LastInput <> "OPS" Or OpFlag = "=" Then
Readout = Readout / 100
LastInput = "PER"
PointFlag = True
End If

End Sub

Private Sub cmdStart_Click()

Readout.Enabled = True
Number(0).Enabled = True
Number(1).Enabled = True
Number(2).Enabled = True
Number(3).Enabled = True
Number(4).Enabled = True
Number(5).Enabled = True
Number(6).Enabled = True
Number(7).Enabled = True
Number(8).Enabled = True
Number(9).Enabled = True
ChangeFlag.Enabled = True
cmdPoint.Enabled = True
Cancel.Enabled = True
CancelEntry.Enabled = True
Operator(0).Enabled = True
Operator(1).Enabled = True
Operator(2).Enabled = True
Operator(3).Enabled = True
Operator(4).Enabled = True
Percent.Enabled = True

End Sub

Private Sub cmdExit_Click()
Unload Me
End Sub

Private Sub MnuExit_Click()
Unload Me
End Sub

Private Sub MnuStart_Click()

Readout.Enabled = True
Number(0).Enabled = True
Number(1).Enabled = True
Number(2).Enabled = True
Number(3).Enabled = True
Number(4).Enabled = True
Number(5).Enabled = True
Number(6).Enabled = True
Number(7).Enabled = True
Number(8).Enabled = True
Number(9).Enabled = True
ChangeFlag.Enabled = True
cmdPoint.Enabled = True
Cancel.Enabled = True
CancelEntry.Enabled = True
Operator(0).Enabled = True
Operator(1).Enabled = True
Operator(2).Enabled = True
Operator(3).Enabled = True
Operator(4).Enabled = True
Percent.Enabled = True

End Sub

*请帮忙完善键盘响应*
Private Sub Readout_KeyDown(KeyCode As Integer, Shift As Integer)

End Sub

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