VB] How to initialize 2nd array in struct

Question

An error occurs in the place to initialize the array.

How Can I Use that array ?

It must be a two-dimensional array of character...

Thank you....

<StructLayout(LayoutKind.Sequential, CharSet:=CharSet.Ansi, Pack:=1)> _
Public Structure ST_TEST
    <MarshalAs(UnmanagedType.ByValArray, SizeConst:=360)>
    Public 2D_CHAR_ARR()() As Char  '//Array In Struct can not be fixed row&col
End Structure

''''''''''''''''''''''''''''''''''''''''

Dim stTest As ST_TEST
ReDim stTest.2D_CHAR_ARR(60)(60)   ' //throws System.NullReferenceException

Brian Hooper · Accepted Answer · 2015-12-22 13:44:09Z

1

The null reference is occurring because your array as you have defined it isn't a square array but an array of arrays. To ReDim it you need to write something like

ReDim MyArray(60)

For i As Integer = 0 To 60
    ReDim MyArray(i)(60)
Next i

If a square array is what you wanted, you should declare it

Public MyArray(60, 60)

answered Dec 22, 2015 at 13:44

Brian Hooper

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1 Comment

E.B Over a year ago

Despite the basic question, thank you for writing the answers. I am honored to be able to learn new knowledge. Thank you very much! Have a good day.

shadow · Accepted Answer · 2015-12-22 13:48:04Z

0

Multi-dimensional array

Dim matrix = New Integer(4, 4) {{1, 2}, {3, 4}, {5, 6}, {7, 8}}

Jagged array

Dim sales()() As Double = New Double(11)() {}

From Arrays in Visual Basic

answered Dec 22, 2015 at 13:48

shadow

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