vba - 将数组传递给 ParamArray

Question

是否可以将数组的所有元素传递给 ParamArray？

例如，我想将一个 ParamArray 传递给另一个 ParamArray：

Sub test()
    p1 "test", "banane", "birne"
End Sub

Sub p1(ParamArray keys() As Variant)
    p2 keys 'should be the same as: p2 "test", "banane", "birne"
End Sub

Sub p2(ParamArray keys() As Variant)
    Dim key As Variant
    For Each key In keys
        Debug.Print key 'Run-time error '13' Type mismatch (key is an array)
    Next key
End Sub

在这种情况下， ParamArray ofp2不包含的元素keys，但它获得了 array-object keys。因此，我必须检查是否传递了数组：

Sub test()
    p1 "test", "banane", "birne"
    p2 "test", "banane", "birne"
End Sub

Sub p1(ParamArray keys() As Variant)
    p2 keys
End Sub

Sub p2(ParamArray params() As Variant)
    Dim keys As Variant
    If IsArray(params(0)) Then
        keys = params(0)
    Else
        keys = params
    End If

    Dim key As Variant
    For Each key In keys
        Debug.Print key
    Next key
End Sub

但这与 Java 相比是很尴尬的：

public class VarArgs {

    public static void main(String[] args) {
        p1("test", "banane", "birne");
        p2("test", "banane", "birne");

        String[] array = {"test", "banane", "birne"};
        p1(array);
        p2(array);
    }

    public static void p1(String... strings) {
        p2(strings);
    }

    public static void p2(String... strings) {
        for (String string : strings) {
            System.out.println(string);
        }
    }

}

在Java中我不必区分。但这在 VBA 中可能是不可能的。

谢谢你的帮助，
迈克尔

score 11 · Accepted Answer

将 ParamArray 参数传递给另一个需要 ParamArray 参数的函数（委托 ParamArray 参数）。我需要委托给一个类型的函数：strf(str as string, ParamArray args() as Variant) as String在 ParamArray 中的其他函数中接收的参数直接传递而无需显式写入。我发现的限制是：

ParamArray() 它只能传递给另一个需要 ParamArray 的函数。
ParamArray 在元素 0 处作为 Variant () 接收
当第二个函数接收到它增加了一个深度级别时，我还没有找到任何令人满意的解决方案，但我编写了一个完美运行的函数，撤消添加的深度级别并返回一个带有接收参数的向量。

代码：

Option Explicit
Option Base 1

Public Sub PrAr1(ParamArray pa1() As Variant)
Dim arr() As Variant
  arr = fn.ParamArrayDelegated(pa1)
  PrAr2 pa1
End Sub

Public Sub PrAr2(ParamArray pa2() As Variant)
Dim i As Integer, arrPrms() As Variant
  arrPrms = fn.ParamArrayDelegated(pa2)
  For i = 0 To UBound(arrPrms)
    Debug.Print s.strf("i: %0 prm: %1 ", i, arrPrms(i))
  Next i
  PrAr3 pa2
End Sub

Public Sub PrAr3(ParamArray pa3() As Variant)
Dim i As Integer, arrPrms() As Variant
  arrPrms = fn.ParamArrayDelegated(pa3)
  For i = 0 To UBound(arrPrms)
    Debug.Print s.strf("i: %0 prm: %1 ", i, arrPrms(i))
  Next i
End Sub

Public Function ParamArrayDelegated(ParamArray prms() As Variant) As Variant
Dim arrPrms() As Variant, arrWrk() As Variant
'When prms(0) is Array, supposed is delegated from another function
  arrPrms = prms
  Do While VarType(arrPrms(0)) >= vbArray And UBound(arrPrms) < 1
    arrWrk = arrPrms(0)
    arrPrms = arrWrk
  Loop
  ParamArrayDelegated = arrPrms
End Function

score 9 · Accepted Answer

Variant您可以从第二次调用将其转换为：

Sub test()
    p1 "test", "banane", "birne"
End Sub

Sub p1(ParamArray keys() As Variant)
    p2 CVar(keys) '<--| pass it as a Variant
End Sub

Sub p2(keys As Variant) '<--| accept a Variant argument
    Dim key As Variant

    For Each key In keys
        Debug.Print key
    Next key
End Sub

score 5 · Accepted Answer

这是我的解决方案。请注意，它的一个限制是您只能将一个（变体）数组参数传递给 ParamArray 参数集。可能它可以概括为处理多个传递的数组，但我还没有遇到这种需要。

Option Explicit

Sub test()
    p1 "test", "banane", "birne"
    p2 "test", "banane", "birne"
End Sub


Sub p1(ParamArray keys() As Variant)
    Dim TempKeys As Variant

    TempKeys = keys 'ParamArray isn't actually a standard Variant array, so you have to copy
                    'it to one in order for the added test/workaround in p2 to not crash
                    'Excel.

    p2 TempKeys 'should be the same as: p2 "test", "banane", "birne"
End Sub

Sub p2(ParamArray keys() As Variant)
    Dim key As Variant

    If IsArray(keys(0)) Then keys = keys(0) 'Set this routine's ParamArray parameter to be
                                            'the array of its first element.

    For Each key In keys
        Debug.Print key
    Next key
End Sub

score 3 · Accepted Answer

尝试：

Sub p2(ParamArray keys() As Variant) 
dim myKey as Variant  
 If IsArray(keys(0)) Then
        myKey = keys(0)
    Else
        myKey = keys()
 End If

...
end sub

score 0 · Accepted Answer

Sub test()
    p1 "test", "banane", "birne"
End Sub

Sub p1(ParamArray keys() As Variant)
    p2 keys
End Sub

Sub p2(ParamArray keys() As Variant)
    Dim key As Variant
    For Each key In keys
        Debug.Print key(0) '<- Give an Index here.
    Next key
End Sub

score 0 · Accepted Answer

我最强烈的需求之一就是能够把 aParamArray values() As Variant变成String().

根据 OPs 的问题，我还需要能够将其他功能转发给该功能，其中其他功能有 aParamArray也需要转换为 a String()，然后该功能才能继续处理。

这是一个解决方案，其中包括一个强大的函数来安全地返回数组的大小：

Public Function f_uas_astrFromParamArray( _
    ParamArray pr_avarValues() As Variant _
) As String()
  Dim astrResult() As String
  
  Dim avarTemp() As Variant
  Dim lngSize As Long
  Dim lngUBound As Long
  Dim lngIndex As Long
  
  If (IsMissing(pr_avarValues) = False) Then
    If (IsArray(pr_avarValues(0)) = True) Then
      avarTemp = pr_avarValues(0)
    Else
      avarTemp = pr_avarValues
    End If
    lngSize = f_lngArraySize(avarTemp)
    If (lngSize > 0) Then
      lngUBound = lngSize - 1
      ReDim astrResult(0 To lngUBound)
      For lngIndex = 0 To lngUBound
        astrResult(lngIndex) = CStr(avarTemp(lngIndex))
      Next lngIndex
    End If
  End If
  
  f_uas_astrFromParamArray = astrResult
End Function

'Return Value:
'   -1 - Not an Array
'    0 - Empty
'  > 0 - Defined
Public Function f_ua_lngArraySize( _
    ByRef pr_avarValues As Variant _
  , Optional ByVal pv_lngDimensionOneBased As Long = 1 _
) As Long
  Dim lngSize As Long: lngSize = -1 'Default to not an Array
  Dim lngLBound As Long
  Dim lngUBound As Long
  
  On Error GoTo Recovery
  
  If (IsArray(pr_avarValues) = True) Then
    lngSize = 0 'Move default to Empty
    lngLBound = LBound(pr_avarValues, pv_lngDimensionOneBased)
    lngUBound = UBound(pr_avarValues, pv_lngDimensionOneBased)
    If (lngLBound <= lngUBound) Then
      lngSize = lngUBound - lngLBound + 1 'Non-Empty, so return size
    End If
  End If
  
NormalExit:
  f_ua_lngArraySize = lngSize
  Exit Function
  
Recovery:
  GoTo NormalExit
End Function

score 0 · Accepted Answer

为了在 Excel 本身调用的函数之间传递 ParamArray 变体，@JoséIborraBotia 在以前的帖子中显示的拆箱原则正在处理范围列表，但是 在尝试将一个级别拆箱而不是

VarType, UBound or IsArray像以前建议的那样进行测试，

允许它也适用于单个范围，当将 Excel 选择传递给自定义函数时，女巫至关重要。

让我们找到这个拆箱函数以及它用于计算 Excel 单元格选择的任意组合的演示：

ParamArray 拆箱功能：

Public Function unboxPA(ParamArray prms() As Variant) As Variant
    Dim arrPrms() As Variant, arrWrk() As Variant
    Dim done As Boolean
    done = False
    arrPrms = prms
    Do While Not done
        On Error Resume Next
          arrWrk = arrPrms(0)
        If (Err.Number > 0) Then
          done = True
        End If
        arrPrms = arrWrk
    Loop
    unboxPA = arrPrms
End Function

取消装箱用于计算任何 excel 单元格选择：

Function MyCountLargeCellsPA(ParamArray rangeArray() As Variant)
    Dim unboxed() As Variant
    unboxed = unboxPA(rangeArray)
    Dim n As Long
    For n = LBound(unboxed) To UBound(unboxed)
        MyCountLargeCellsPA = MyCountLargeCellsPA + unboxed(n).CountLarge
    Next
End Function

这允许使用 ParamArray 从函数到函数的任何嵌套调用，

现在可以使用 VBA 进行编程了！

score -3 · Accepted Answer

paramArrays 很奇怪，但你可以使用普通的 Array，它工作得很好

 Sub test()
    Dim a As Variant: a = Array("test", "banane", "birne")
    p1 a
End Sub

Sub p1(keys As Variant)
    p2 keys
End Sub

Sub p2(keys As Variant)
    Dim key As Variant
    For Each key In keys
        Debug.Print key
    Next key
End Sub

vba - 将数组传递给 ParamArray

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