wincc 7.5SP2下VBA编程学习练习15：批量删除变量

在前面练习的基础上学习批量删除变量。

新建下面的脚本：

Sub DeleteTags()
'批量删除变量
Dim hmigo As hmigo
Dim strTagName As String
Dim i As Integer
Set hmigo = New hmigo
For i = 1 To 5
strTagName = "Real" & CStr(i)
hmigo.DeleteTag strTagName
Next
Set hmigo = Nothing
End Sub

保存，运行就会删除Real1至Real5共计5个变量。如果这些变量已经被删除了，运行脚本就会报错。

为了容错性，对上面的脚本重新编写如下，先判断要删除的变量是否存在，存在才做删除操作：

Sub DeleteTags()
'批量删除变量
Dim hmigo As hmigo
Dim strTagName As String
Dim i As Integer
Set hmigo = New hmigo
'For i = 1 To 5
' strTagName = "Real" & CStr(i)
' hmigo.DeleteTag strTagName
'Next
For i = 1 To 5
strTagName = "Real" & CStr(i)
hmigo.ListTag TAG_NAMES, Tags, strTagName
If (UBound(Tags) - LBound(Tags) + 1) > 0 Then
hmigo.DeleteTag strTagName
End If
Next
Set hmigo = Nothing
End Sub