Länge eines Array (length of an array)

Question

Hallo,
gibt es ähnlich wie bei Kanälen - chnlength - eine Möglichkeit die Länge von Arrays abzufragen?
Is there any possibility to get the length of an array like chnlength?
Gruß

Answer 1

Arrays in vbs are a little tricky.
Thats mainly because
dim arr()
does not create an empty array but an unitialized one. So calling Ubound(arr) will raise an error.
It will also fail to loop using "for each".
So I would suggest to never use "()" to define an array but
dim arr : arr = Array()
MsgBox "length=" & ubound(arr) + 1
dim arrElem
for each arrElem in arr
' here we can do something
Next
Array() will create an initialized Array of length 0. UBound will give -1 as return value.
Usng this returing an array from a funtion works quiet well without having to check for exceptions if array is empty.
Option Explicit
Function GetElems()
GetElems = Array()
' do some stuff
end function
dim elems : elems = GetElems
dim elem
for each elem in elems
' here we can do something
Next
If you want to dynamically grow an array you can use redim preserve.
Option Explicit
dim arr : arr = Array()
redim preserve arr(Ubound(arr) + 1)
arr(UBound(arr)) = "Appended text"
MsgBox "length=" & ubound(arr) + 1 & VBCRLF & arr(0)