VB] How to initialize 2nd array in struct

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Hello.

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.

VB

<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

Posted 22-Dec-15 1:50am

Member 11153736

Updated 22-Dec-15 2:09am

v4

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Tomas Takac 22-Dec-15 8:19am

What you have there is a jagged array[^].

1 solution

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Tomas Takac · Accepted Answer · 2015-12-22T02:46:00

Solution 1

You never initialize the array, that's why redim will throw and exception. And i guess you don't need the jagged array. try this:

VB

Public Structure ST_TEST
    Public _2D_CHAR_ARR(,) As Char '2D array
End Structure

Dim stTest As ST_TEST
stTest._2D_CHAR_ARR = New Char(60, 60) {} ' here you create the array

Posted 22-Dec-15 2:46am

Tomas Takac

Comments

Member 11153736 22-Dec-15 19:18pm

Despite the basic question, thank you for writing the answers.
Thank you very much!
Have a good day.