How to convert strct to byte array

[Anitha Naidu]

I have structure as below in C# which is equal to Cobol Copy book structue

[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Ansi)]
    public class InputStruct
    {
        [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 7)]
        public string CustomerNumber;
 
        [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 1)]
        public string CustomerType;
 
        [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 2)]
        public string EndUseCode;
 
        [MarshalAs(UnmanagedType.I4, SizeConst = 5)]
        public string Quantity;
    }

Cobol copy book structure:
01 SOS-INPUT-PC50181.
05 CUST-NO-PC50181 PIC X(07).
05 CUST-TYPE-PC50181 PIC X(01).
88 CASH-CUST-PC50181 VALUE "C".
05 END-USE-CODE-PC50181 PIC X(02).
05 EQUIP-MFR-MODEL-PC50181 PIC X(10).
05 ORD-QTY-PC50181 PIC S9(05).

i am converting Csharp struct above byte of arry to pass it to Cobol program

using below code:

 public static byte[] StructureToByteArray(object obj)
        {
 
            int Length = Marshal.SizeOf(obj);
            byte[] bytearray = new byte[Length];
            IntPtr ptr = Marshal.AllocHGlobal(Length);            
            Marshal.StructureToPtr(obj, ptr, true);
            Marshal.Copy(ptr, bytearray, 0, Length);
            Marshal.FreeHGlobal(ptr);
            return bytearray;
        }
 

after converting above struct to byte array i passing it to cobol program, in cobol program input values are not placeing for each feild ie. customer number has only 6 chars and other values are missing and quantity field is displaying as "illegal value in field".

Please help to map the values to cobol understanding values.

[Anitha naidu]

Hi

I changed string to char[] and UnmanagedType to UnmanagedType.ByValArray for string values its working fine now but still has problem in Integer values i am passing 5 digit numric values to ORD-QTY of PIC S9(5) but it says <illegal value in numeric field>.

Please help me if you have solutions.

THanks
Akv