Question

vb中如何动态添加删除控件

Private Declare Function GetCursorPos Lib "user32" (lpPoint As pointapi) As Long
Private Type pointapi
X As Long
Y As Long
End Type
Private Sub Command_Click(Index As Integer)
Text3.Text = 1
End Sub

Private Sub Command_MouseDown(Index As Integer, Button As Integer, Shift As Integer, X As Single, Y As Single)
If Index > 0 And Button = 2 Then
Unload Command(Index)
End If
End Sub

Private Sub Form_MouseDown(Button As Integer, Shift As Integer, X As Single, Y As Single)
Dim mouse As pointapi
GetCursorPos mouse
Text1.Text = Val(mouse.X) * 15 - Me.Left - 50
Text2.Text = Val(mouse.Y) * 15 - Me.Top - 300
If Text1.Text > 1000 Then
If Text3.Text = 1 Then
If Button = 1 Then
i = Command.UBound + 1
Load Command(i)
Command(i).Left = Text1.Text
Command(i).Top = Text2.Text
Command(i).Caption = Str(i)
Command(i).Visible = True
End If
End If
If Text3.Text = 2 Then
If Button = 1 Then
i = Label.UBound + 1
Load Label(i)
Label(i).Left = Text1.Text
Label(i).Top = Text2.Text
Label(i).Caption = Str(i)
Label(i).Visible = True
End If
End If
If Text3.Text = 3 Then
If Button = 1 Then
i = Text.UBound + 1
Load Text(i)
Text(i).Left = Text1.Text
Text(i).Top = Text2.Text

Text(i).Visible = True
End If
End If
End If
End Sub

Private Sub Label_Click(Index As Integer)
Text3.Text = 2
End Sub

Private Sub Label_MouseDown(Index As Integer, Button As Integer, Shift As Integer, X As Single, Y As Single)
If Index > 0 And Button = 2 Then
Unload Label(Index)
End If
End Sub

Private Sub Text_Click(Index As Integer)
Text3.Text = 3
End Sub

Private Sub Text_MouseDown(Index As Integer, Button As Integer, Shift As Integer, X As Single, Y As Single)
If Index > 0 And Button = 2 Then
Unload Text(Index)
End If
End Sub
无法在窗体上添加控件是为什么
小弟明白，但是我上面的程序错在什么地方，无法显示控件啊，谢谢！

Answer 1

用 Controls.Remove(控件) 动态删除控件。注意：在VB中只能动态删除那些动态添加的控件；不允许删除在窗体设计器上布置的控件！

示例如下：

（1）创建一个VB工程

（2）在Form1上布置两个Command

（3）窗体代码

Option Explicit

' 声明要被动态添加/删除的控件
Dim x As Label

'-----------------------------
' 动态添加一个Label控件
'-----------------------------
Private Sub Command1_Click()
    If x Is Nothing Then
        Set x = Controls.Add("VB.Label", "label1")
        x.Move 150, 150
        x.AutoSize = True
        x.Caption = "这个是动态添加的标签"
        x.Visible = True    
    End If
End Sub

'-----------------
' 动态删除控件
'-----------------
Private Sub Command2_Click()
    If x Is Nothing Then Exit Sub
    Controls.Remove x
    Set x = Nothing
End Sub

Private Sub Form_Load()
    Command1.Caption = "添加控件"
    Command2.Caption = "删除控件"
End Sub

（4）运行

窗体启动

点击“添加控件”按钮

点击“删除控件”按钮

Answer 2

动态添加控件有两种方法，一种是添加一个控件，一种是再已存在的控件组里动态添加组员。
法1：dim withevents CMD as commandbutton
set CMD=controls.add(""vb.commandbutton","CMD1")
之后设置CMD1的各个属性即可
法2：先在设计窗口上创建一个控件数组组员，比如名为CMD1(0)的一个按钮，然后在程序中使用Load方法加载新组员，比如 load CMD1(1)，load CMD1(2)...之后再设置其属性即可。

乘以15是坐标两种单位的换算，VB默认坐标单位是tiwp（缇），缇与像素之间换算关系是 ： 15缇=1像素

Answer 3

Private Sub Form_Load()
Form1.Controls.Add "VB.CommandButton", "cmdObj1", Frame1
With Form1!cmdObj1
.Visible = True
.Width = 2000
.Caption = "Dynamic Button"
End With
End Sub