Arrays 检查数组是否有值，如果为空则忽略

因此，我的代码设置为发送一封电子邮件，其中包含符合某个单元格名称的所有行（缺少文本）。如果搜索中没有这些，我希望它绕过并输入“无”。如果有细胞有它，它的工作原理很好，但如果没有，我会得到一个下标o范围外的错误

Dim MissingText() As Variant
Dim WrongNum() As Variant
Dim BlankText() As Variant
Dim objOutlook As Object
Dim objMsg As Object


Set objOutlook = CreateObject("Outlook.Application")
Erase MissingText, WrongNum, BlankText

Listed = 0
Ending = Cells(Rows.Count, 5).End(xlUp).Row
n = 0
For Listed = 2 To Ending
    If Cells(Listed, 10).Value = "Missing Text" Then
        ReDim Preserve MissingText(n)
        MissingText(n) = Listed
        n = n + 1
    End If

Next Listed
If IsEmpty(MissingText) Then
    MissingTogether = "None"
    GoTo MissingSkip
End If
CountArray = UBound(MissingText, 1) - LBound(MissingText, 1) + 1
CountArray = CountArray - 1
MissingTogether = Join(MissingText, ", ")
MissingSkip:

（续）

---

在CountArray=UBound（MissingText，1）-LBound（MissingText，1）+1是发生错误的时间。任何帮助都会很好，谢谢。

我将使用字符串变量和

split（）

dim strMissing as string, aryMissing as variant

For Listed = 2 To Ending
    If Cells(Listed, 10).Value = "Missing Text" Then
        strMissing = Listed & ", " & strMissing
    End If
Next Listed

If strMissing = "" then 
    MissingTogether = "None"
    GoTo MissingSkip
else
    aryMissing = split(strMissing, ", ")
    CountArray = UBound(MissingText, 1) - LBound(MissingText, 1) + 1
End If

正如注释中指出的，没有一种本机方法来确定数组是否在VBA中未初始化。但是，您可以检查它的内存占用，看看它的变量是否包含空指针。请注意，
VarPtr
引发数组的类型不匹配，因此需要首先将其包装在
变量中：

'In declarations section:
#If VBA7 Then
    Private Declare PtrSafe Sub CopyMemory Lib "kernel32" Alias _
        "RtlMoveMemory" (ByRef Destination As Any, ByRef Source As Any, _
        ByVal length As Long)
#Else
    Private Declare Sub CopyMemory Lib "kernel32" Alias _
        "RtlMoveMemory" (ByRef Destination As Any, ByRef Source As Any, _
        ByVal length As Long)
#End If

Private Const VT_BY_REF As Integer = &H4000&
Private Const DATA_OFFSET As Long = 8

Private Function IsUninitializedArray(SafeArray As Variant) As Boolean
    If Not IsArray(SafeArray) Then
        Exit Function
    End If

    Dim vtype As Integer
    'First 2 bytes are the VARENUM.
    CopyMemory vtype, SafeArray, LenB(vtype)
#If VBA7 Then
    Dim lp As LongPtr
#Else
    Dim lp As Long
#End If
    'Get the data pointer.
    CopyMemory lp, ByVal VarPtr(SafeArray) + DATA_OFFSET, LenB(lp)
    'Make sure the VARENUM is a pointer.
    If (vtype And VT_BY_REF) <> 0 Then
        'Dereference it for the actual data address.
        CopyMemory lp, ByVal lp, LenB(lp)
        IsUninitializedArray = lp <> 0
    End If
End Function

为什么不测试
n>0
？哈哈，我想我是想把它弄得更复杂，而且我已经盯着它看了一段时间了。谢谢你是的，你可以检查
n>0
或者使用一个布尔变量（在你没有
n
的情况下），或者使用中提到的函数，如果你必须在你的代码中的很多地方检查初始化的数组。是的，擦除后重新定义一个变量是可以的，但是测试它是否有用是浪费时间。IsArray是真的，IsMissing和IsEmpty都是假的。LBound和UBound都会抛出错误。
Public Sub Example()
    Dim Test() As String
    MsgBox IsUninitializedArray(Test) 'False

    Test = Split(vbNullString)
    MsgBox IsUninitializedArray(Test) 'True

    Erase Test
    MsgBox IsUninitializedArray(Test) 'False
End Sub