Array declarations

[xwb]

I've looked on the net and in several books and I still can't figure out how to do this. In C, I would have done

#define OVERALL_SIZE 1400
#define ONE_SIZE (OVERALL_SIZE - 8)
struct One
{
   int onea;
   int oneb;
   unsigned char mdata[ONE_SIZE];
};
#define TWO_SIZE (OVERALL_SIZE - 4)
struct Two
{
   float twoa;
   unsigned char mdata[TWO_SIZE];
};

The best I've come up with is

static int OVERALL_SIZE = 1400;
static int ONE_SIZE = OVERALL_SIZE - 8;
static int TWO_SIZE = OVERALL_SIZE - 4;
class One
{
   public int onea;
   public int oneb;
   public byte mdata[ONE_SIZE];
};
class Two
{
   public float twoa;
   public byte mdata[TWO_SIZE];
};

Only problem is the static decls have to be in a class. If I put them in the classes, then the classes can't refer to each other. Any suggestions would be helpful.

 

[DavidKuhn0422]

Not sure waht you are trying to do with this?

You could always create a third class for the statics and make it

public class StaticInts

Are you asking how to declare an array?
public int[] VariableName;

 

[mikrom]

I don't have C# now, but IMHO most of C# is similar to Java.
So I would first create a class with global constants and then use this class as parent class for structures-classes and the main public class. See here the Java example:

MyStructures.java

[COLOR=#a020f0]package[/color] examples;

[COLOR=#2e8b57][b]class[/b][/color] GlobalConstants{
  [COLOR=#2e8b57][b]static[/b][/color] [COLOR=#2e8b57][b]int[/b][/color] OVERALL_SIZE = [COLOR=#ff00ff]15[/color];
  [COLOR=#2e8b57][b]static[/b][/color] [COLOR=#2e8b57][b]int[/b][/color] ONE_SIZE = OVERALL_SIZE - [COLOR=#ff00ff]8[/color];
  [COLOR=#2e8b57][b]static[/b][/color] [COLOR=#2e8b57][b]int[/b][/color] TWO_SIZE = OVERALL_SIZE - [COLOR=#ff00ff]4[/color];
}

[COLOR=#2e8b57][b]class[/b][/color] One [COLOR=#2e8b57][b]extends[/b][/color] GlobalConstants{
  [COLOR=#2e8b57][b]public[/b][/color] [COLOR=#2e8b57][b]int[/b][/color] onea;
  [COLOR=#2e8b57][b]public[/b][/color] [COLOR=#2e8b57][b]int[/b][/color] oneb;
  [COLOR=#2e8b57][b]public[/b][/color] [COLOR=#2e8b57][b]byte[/b][/color][] mdata = [COLOR=#804040][b]new[/b][/color] [COLOR=#2e8b57][b]byte[/b][/color][ONE_SIZE];
}

[COLOR=#2e8b57][b]class[/b][/color] Two [COLOR=#2e8b57][b]extends[/b][/color] GlobalConstants{
  [COLOR=#2e8b57][b]public[/b][/color] [COLOR=#2e8b57][b]float[/b][/color] twoa;
  [COLOR=#2e8b57][b]public[/b][/color] [COLOR=#2e8b57][b]byte[/b][/color][] mdata = [COLOR=#804040][b]new[/b][/color] [COLOR=#2e8b57][b]byte[/b][/color][TWO_SIZE];
}

[COLOR=#2e8b57][b]public[/b][/color] [COLOR=#2e8b57][b]class[/b][/color] MyStructures [COLOR=#2e8b57][b]extends[/b][/color] GlobalConstants{
  [COLOR=#2e8b57][b]public[/b][/color] [COLOR=#2e8b57][b]static[/b][/color] [COLOR=#2e8b57][b]void[/b][/color] main(String args[]) {
    [COLOR=#0000ff]// Create Instance of structure One[/color]
    One structOne = [COLOR=#804040][b]new[/b][/color] One();
    [COLOR=#0000ff]// Filling Values[/color]
    structOne.onea = [COLOR=#ff00ff]1[/color];
    structOne.oneb = [COLOR=#ff00ff]2[/color];
    [COLOR=#804040][b]for[/b][/color] ([COLOR=#2e8b57][b]int[/b][/color] i=[COLOR=#ff00ff]0[/color]; i<=ONE_SIZE-[COLOR=#ff00ff]1[/color]; i++){
      structOne.mdata[i]=([COLOR=#2e8b57][b]byte[/b][/color])(Math.random()*[COLOR=#ff00ff]255[/color]);
    }
    [COLOR=#0000ff]// Printing Values[/color]
    System.out.println([COLOR=#ff00ff]"Components of StructOne:"[/color]);
    System.out.format([COLOR=#ff00ff]"structOne.onea = %2d[/color][COLOR=#6a5acd]\n[/color][COLOR=#ff00ff]"[/color], structOne.onea);
    System.out.format([COLOR=#ff00ff]"structOne.oneb = %2d[/color][COLOR=#6a5acd]\n[/color][COLOR=#ff00ff]"[/color], structOne.oneb);
    System.out.format([COLOR=#ff00ff]"ONE_SIZE       = %2d[/color][COLOR=#6a5acd]\n[/color][COLOR=#ff00ff]"[/color], ONE_SIZE);
    [COLOR=#804040][b]for[/b][/color] ([COLOR=#2e8b57][b]int[/b][/color] i=[COLOR=#ff00ff]0[/color]; i<=ONE_SIZE-[COLOR=#ff00ff]1[/color]; i++){
      System.out.format([COLOR=#ff00ff]"structOne.mdata[%02d] = %3d[/color][COLOR=#6a5acd]\n[/color][COLOR=#ff00ff]"[/color], i, structOne.mdata[i]);
    }

    [COLOR=#0000ff]// Create Instance of the structure Two[/color]
    Two structTwo = [COLOR=#804040][b]new[/b][/color] Two();
    [COLOR=#0000ff]// Filling Values[/color]
    structTwo.twoa = [COLOR=#ff00ff]3[/color];
    [COLOR=#804040][b]for[/b][/color] ([COLOR=#2e8b57][b]int[/b][/color] i=[COLOR=#ff00ff]0[/color]; i<=TWO_SIZE-[COLOR=#ff00ff]1[/color]; i++){
      structTwo.mdata[i]=([COLOR=#2e8b57][b]byte[/b][/color])([COLOR=#2e8b57][b]byte[/b][/color])(Math.random()*[COLOR=#ff00ff]255[/color]);
    }
    [COLOR=#0000ff]// Printing Values[/color]
    System.out.println([COLOR=#ff00ff]"[/color][COLOR=#6a5acd]\n[/color][COLOR=#ff00ff]Components of StructTwo:"[/color]);
    System.out.format([COLOR=#ff00ff]"structTwo.twoa = %f[/color][COLOR=#6a5acd]\n[/color][COLOR=#ff00ff]"[/color], structTwo.twoa);
    System.out.format([COLOR=#ff00ff]"TWO_SIZE       = %2d[/color][COLOR=#6a5acd]\n[/color][COLOR=#ff00ff]"[/color], TWO_SIZE);
    [COLOR=#804040][b]for[/b][/color] ([COLOR=#2e8b57][b]int[/b][/color] i=[COLOR=#ff00ff]0[/color]; i<=TWO_SIZE-[COLOR=#ff00ff]1[/color]; i++){
      System.out.format([COLOR=#ff00ff]"structTwo.mdata[%02d] = %3d[/color][COLOR=#6a5acd]\n[/color][COLOR=#ff00ff]"[/color], i, structTwo.mdata[i]);
    }

  }
}

Output:

Components of StructOne:
structOne.onea =  1
structOne.oneb =  2
ONE_SIZE       =  7
structOne.mdata[00] = -28
structOne.mdata[01] = -62
structOne.mdata[02] = -106
structOne.mdata[03] = 100
structOne.mdata[04] = -76
structOne.mdata[05] = -62
structOne.mdata[06] = 124

Components of StructTwo:
structTwo.twoa = 3,000000
TWO_SIZE       = 11
structTwo.mdata[00] = -82
structTwo.mdata[01] = -35
structTwo.mdata[02] = 100
structTwo.mdata[03] =  24
structTwo.mdata[04] = -59
structTwo.mdata[05] = -40
structTwo.mdata[06] =   2
structTwo.mdata[07] =  69
structTwo.mdata[08] = -93
structTwo.mdata[09] = -54
structTwo.mdata[10] =   8

So I guess, that if you change main() to Main() the code will probably work in C# too. But I'm not sure at 100%, because I don't have C# installed on this computer.

 

[mikrom]

The other thing to translate the above Java example in C# is to change System.out.println to System.Console.Write

 

[xwb]

Thanks - got one further problem: Marshalling. I'm importing some of these from C so I need to do something like

[StructLayout(LayoutKind.Sequential)]
public class One 
{
  public int onea;
  public int oneb;
  [MarshalAs(UnmanagedType.ByValArray, SizeConst = ONE_SIZE)]
  public byte[] mdata = new byte[ONE_SIZE];
}

[StructLayout(LayoutKind.Sequential)]
public class Two 
{
  static int TWO_SIZE = OVERALL_SIZE - 4;
  public float twoa;
  [MarshalAs(UnmanagedType.ByValArray, SizeConst = TWO_SIZE)]
  public byte[] mdata = new byte[TWO_SIZE];
}

I tried the inheritence thing but I can't use it with StructLayout.
It keeps on moaning about the SizeConst bit.