数组 – Visual Basic 6运行时错误381“无效的属性数组索引”

我是编程特别是在Visual Basic中的菜鸟.我只使用VB6,因为我必须将它用于大学,我完全陷入困境.

我有一个列表框,我想在其中显示一个收音机的名称然后当我点击我希望它将数据放入一些文本框的名称时,我知道这很简单,但我甚至不完全了解VB6语法所以我我完全陷入困境我问过我的老师,但他并没有任何帮助.

这是单击调试时高亮显示的行：

x = radCatList.ItemData(radCatList.ListIndex)

这是enitre表单的代码,同样非常简单,我几乎不知道我正在做什么这个项目的大部分是复制和粘贴工作：

Option Explicit

Private Sub Form_Load()
Dim r As radioRec
Dim radioChan As Integer
Dim x As Integer

x = 1
radioChan = FreeFile
Open radioFile For Random As radioChan Len = radioLen
Get radioChan, x, r
Do While Not EOF(radioChan)
    radCatList.AddItem r.rModel
    radCatList.ItemData(radCatList.NewIndex) = x
    x = x + 1
    Get radioChan, x, r
Loop
Close radioChan
End Sub

Private Sub radCatList_Click()
Dim r As radioRec
Dim radioChan As Integer
Dim x As Integer

radCatList.Clear

x = radCatList.ItemData(radCatList.ListIndex)
radioChan = FreeFile
Open radioFile For Random As radioChan Len = radioLen
Get radioChan, x, r
channelTxt = r.rLicense
licenseTxt = r.rLicense
rangeTxt = r.rRange
stockTxt.Text = r.rStock
Close radioChan
End Sub

你的listindex可能是-1,因为还没有选择listitem？

看看下面的代码

'1 form with
'    1 listbox : name=List1
Option Explicit

Private Sub Form_Load()
  Dim intIndex As Integer
  For intIndex = 0 To 10
    List1.AddItem CStr(intIndex)
    List1.ItemData(intIndex) = intIndex * intIndex
  Next intIndex
  ShowData List1.ListIndex
End Sub

Private Sub Form_Resize()
  List1.Move 0, 0, ScaleWidth, ScaleHeight
End Sub

Private Sub List1_Click()
  ShowData List1.ListIndex
End Sub

Private Sub ShowData(intIndex As Integer)
  Dim strShow As String
  strShow = "Index:" & CStr(intIndex)
  If intIndex > -1 Then
    strShow = strShow & " Data:" & CStr(List1.ItemData(intIndex))
  End If
  Caption = strShow
End Sub

所以你要添加的是检查listindex是不是-1