How do I pass values to arrays declared in structure?

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Hi,

I created a structure like this.

C#

public struct t
{
            [FieldOffset(76)]
            [MarshalAs(UnmanagedType.ByValArray, SizeConst = 20)]
            public byte[] Lname;

            [FieldOffset(96)]
            [MarshalAs(UnmanagedType.ByValArray, SizeConst = 3)]
            public byte[] T;

            [FieldOffset(104)]
            [MarshalAs(UnmanagedType.ByValArray, SizeConst = 50)]
            public byte[] ID;

            [FieldOffset(160)]
            [MarshalAs(UnmanagedType.ByValArray, SizeConst = 3)]
            public int[] DC;

            [FieldOffset(168)]
            [MarshalAs(UnmanagedType.ByValArray, SizeConst = 8)]
            public float[]GAIN;

             [FieldOffset(176)]
            [MarshalAs(UnmanagedType.ByValArray, SizeConst = 8)]

            public byte[,] status;
            [FieldOffset(168)]

Now I want to pass values to these structures. And wrote c# code as follows.

C#

array[0].name = Encoding.ASCII.GetBytes("abc");
                   array[0].T= Encoding.ASCII.GetBytes ("gh");  
                  array[0].DC=12;

Is this is a correct way or not?? if not how can I pass values to corresponding array..
Thanks..

Posted 16-Apr-15 1:31am

Member 10994712

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Comments

E.F. Nijboer 16-Apr-15 8:06am

Try executing it and you'll know if it is correct. I guess that is the whole point of this homework assignment.

Member 10994712 16-Apr-15 23:31pm

I executed it. But I got an error that Object reference not set to an instance of an object.

E.F. Nijboer 17-Apr-15 12:08pm

What did you do to initialize array[0]? How did you declare it?

Member 10994712 17-Apr-15 23:52pm

t[] array = new t[210];

Sergey Alexandrovich Kryukov 16-Apr-15 11:11am

Why all that? Do you use this structure in P/Invoke?
—SA

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E.F. Nijboer · Answer 1 · 2015-04-18T04:48:00

If you instantiate an array, this only clears room for the number of entries in that array. No actual items are yet created. Although structs are passed by valued (copied whole) they are not automatically created on declaration. So you need to create a new struct first.

array[0] = new t();

Good luck!