VBA 按钮事件处理程序实现

Question

我想使用以下类代码处理类中对命令按钮的单击

。

Option Explicit
Private m_First                     As MSForms.CommandButton
Private WithEvents evFirst          As MSForms.CommandButton
Property Get First() As MSForms.CommandButton
Set First = m_First
End Property
Property Let First(ByRef o As MSForms.CommandButton)
Set m_First = o
Set evFirst = o
End Property
Private Sub evFirst_Click()
MsgBox "It Worked!"
End Sub

除了它不起作用之外，我想知道为什么表单中对按钮的引用与类中的引用不同，即：

Sub Tester()
Dim f As New UserForm1
Dim o As New cButtonClass
o.First = f.CommandButton1
Dim k1 As LongLong: k1 = ObjPtr(o.First)
Dim k2 As LongLong: k2 = ObjPtr(f.CommandButton1)
Debug.Assert k1 = k2 'NOPE!
End Sub

为什么这不起作用？修复是什么？

Answer 1

这是反映上述注释的更新代码。 它按预期工作。 但是，对于您关于ObjPtr的其他问题，我还没有答案。

下面是类代码：

Option Explicit
Private WithEvents evFirst As MSForms.CommandButton
Property Get First() As MSForms.CommandButton
Set First = evFirst
End Property
Property Set First(ByRef o As MSForms.CommandButton)
Set evFirst = o
End Property
Private Sub evFirst_Click()
MsgBox "Class Click"
End Sub

以下是工作表代码：

Option Explicit
Public Sub Tester()
Dim f As UserForm1
Dim o As cButtonClass
Set f = New UserForm1
Set o = New cButtonClass
Set o.First = f.CommandButton1
f.Show vbModal
Dim k1 As LongPtr: k1 = ObjPtr(o.First)
Dim k2 As LongPtr: k2 = ObjPtr(f.CommandButton1)
Debug.Assert k1 = k2 'NOPE!
End Sub

这是用户表单代码：

Private Sub CommandButton1_Click()
MsgBox "UserForm Click"
End Sub