运行效果：
程序代码：
Dim current, prev, choice '全局变量
'-------------这段代码是个额外加上的小测试可以忽略----------
'---------------用API来关闭正在运行运行的程序---------------
Private Declare Function FindWindow Lib "user32" Alias "FindWindowA" (ByVal lpClassName As String, ByVal lpWindowName As String) As Long
Private Declare Function PostMessage Lib "user32" Alias "PostMessageA" (ByVal hwnd As Long, ByVal wMsg As Long, ByVal wParam As Long, ByVal lParam As Long) As Long
Private Const WM_CLOSE = &H10
Private Sub CmdEnd_Click()
Dim winHwnd As Long
Dim RetVal As Long
winHwnd = FindWindow(vbNullString, "简单计算器") '此处为程序的Caption值
Debug.Print winHwnd
If winHwnd <> 0 Then
RetVal = PostMessage(winHwnd, WM_CLOSE, 0&, 0&)
If RetVal = 0 Then
MsgBox "植入消息错误！"
End If
Else
MsgBox "程序没有打开！"
End If
End Sub
'------------------这段代码可以删除不影响程序运行-------------------
Private Sub CmdAc_Click()
Text1.Text = "" '清空输入框
End Sub
Private Sub CmdEquel_Click() '执行“=”
current = Val(Right(Text1.Text, Len(Text1.Text) - Len(prev) - Len(choice))) '获取后半截数字
If choice = "+" Then
current = prev + current
Text1.Text = Text1.Text & "=" & current
ElseIf choice = "-" Then
current = prev - current
Text1.Text = Text1.Text & "=" & current
ElseIf choice = "*" Then
current = prev * current
Text1.Text = Text1.Text & "=" & current
ElseIf choice = "/" And current <> 0 Then
current = prev / current
Text1.Text = Text1.Text & "=" & current
Else
Text1.Text = "Press AC to Continue"
End If
End Sub
Private Sub CmdPlus_Click()
prev = Text1.Text
choice = "+"
Text1.Text = Text1.Text & "+"
End Sub
Private Sub CmdMinus_Click()
prev = Text1.Text
choice = "-"
Text1.Text = Text1.Text & "-"
End Sub
Private Sub CmdAsterisk_Click()
prev = Text1.Text
choice = "*"
Text1.Text = Text1.Text & "*"
End Sub
Private Sub CmdSlash_Click()
prev = Text1.Text
choice = "/"
Text1.Text = Text1.Text & "/"
End Sub
Private Sub CmdPoint_Click()
Text1.Text = Text1.Text & "."
End Sub
Private Sub Command1_Click(Index As Integer)
Text1.Text = Text1.Text & Index '控件数组的Index属性值来输入0-9
End Sub
Private Sub Text1_KeyDown(KeyCode As Integer, Shift As Integer) '键盘输入值保存到定义好的变量中
Select Case KeyCode
Case 13 '回车
Call CmdEquel_Click
Case 107
prev = Text1.Text
choice = "+"
Case 109
prev = Text1.Text
choice = "-"
Case 106
prev = Text1.Text
choice = "*"
Case 111
prev = Text1.Text
choice = "/"
Case 35 'End键
Call CmdAc_Click
End Select
End Sub
编写心得：
1、这个实例体现了控件数组的优越性，不用每一个按钮去添加0-9数字执行的过程。
2、开头出代码绑定了“End”命令按钮，用API来关闭正在运行的程序，感觉没多大用，就我目前的知识水平，感觉这大段代码的作用等同于“End”，希望在今后的学习中能够了解其更深层次的用法。
3、此处运用了KeyCode键盘代码，附图如下：
