I need to pass array from Native Cobol to C# COM object. When I am passing only single string or number it's working. But with array I got error message: **Exception 65537 not trapped by the class oleexceptionmanager. Description: "Server defined OLE exception"
(80070057): The parameter is incorrect.

I think that I must somehow differently declare array in Cobol part?

Cobol code:

$SET DIRECTIVES (SBODBC.DIR) NSYMBOL"NATIONAL"
$set ooctrl( p)
identification division.
program-id. pokus444.
special-names.
environment-name is environment-name
environment-value is environment-value
decimal-point is comma.
class-control.
ChkAccNum is class "$OLE$CheckAccountNumber.AccountNumbers".
working-storage section.
01 ChkAccNumObj object reference.
01 accA.
05 acc pic x(34) occurs 100.
01 accR pic x(34).
procedure division.
main section.
display "Zacatek programu"
initialize accA accR
move '1234567890' to acc(1)
move '0987654321' to acc(2)
invoke ChkAccNum "new" returning ChkAccNumObj
invoke ChkAccNumObj "CheckAccount" using accA
returning accR
display accR
exit
.

C# code:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Runtime.InteropServices;

namespace CheckAccountNumber
{
    [Guid("A80930D1-080F-4B04-A2C3-B637428556D6")]
    public interface IAccountNumbers
    {
        [DispId(1)]
        string CheckAccount(string[] accounts);
    }

    [Guid("65A771A0-0DDE-440D-9A4F-C71CEAEE3DF6"),
    ClassInterface(ClassInterfaceType.None)]
    public class AccountNumbers : IAccountNumbers
    {
        public AccountNumbers()
        {
        }

        public string CheckAccount(string[] accounts)
        {
            return accounts[1];
        }
    }
}

I need to pass array from Native Cobol to C# COM object. When I am passing only single string or number it's working. But with array I got error message: **Exception 65537 not trapped by the class oleexceptionmanager. Description: "Server defined OLE exception"
(80070057): The parameter is incorrect.

I think that I must somehow differently declare array in Cobol part?

Cobol code:

$SET DIRECTIVES (SBODBC.DIR) NSYMBOL"NATIONAL"
$set ooctrl( p)
identification division.
program-id. pokus444.
special-names.
environment-name is environment-name
environment-value is environment-value
decimal-point is comma.
class-control.
ChkAccNum is class "$OLE$CheckAccountNumber.AccountNumbers".
working-storage section.
01 ChkAccNumObj object reference.
01 accA.
05 acc pic x(34) occurs 100.
01 accR pic x(34).
procedure division.
main section.
display "Zacatek programu"
initialize accA accR
move '1234567890' to acc(1)
move '0987654321' to acc(2)
invoke ChkAccNum "new" returning ChkAccNumObj
invoke ChkAccNumObj "CheckAccount" using accA
returning accR
display accR
exit
.

C# code:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Runtime.InteropServices;

namespace CheckAccountNumber
{
    [Guid("A80930D1-080F-4B04-A2C3-B637428556D6")]
    public interface IAccountNumbers
    {
        [DispId(1)]
        string CheckAccount(string[] accounts);
    }

    [Guid("65A771A0-0DDE-440D-9A4F-C71CEAEE3DF6"),
    ClassInterface(ClassInterfaceType.None)]
    public class AccountNumbers : IAccountNumbers
    {
        public AccountNumbers()
        {
        }

        public string CheckAccount(string[] accounts)
        {
            return accounts[1];
        }
    }
}

But I have more questions. How to process array when I return it back from COM object - how to move it to standard Cobol array? And how to process 2 dimensional array?

I found this article about multidimensional safearrays, but I am unable to get it working. I mean to pass 2dimensional array to COM object and then return some value back to Cobol

The SafeArray class is documented in the NX documentation here

You can find out information about the array's contents and unpack the array into its various elements using its methods.

It does show example code as well.

This is a somewhat cumbersome approach to interface with C#

Have you looked into the Visual COBOL product at all? Visual COBOL would allow you to create a managed .NET COBOL class wrapper that was registered as COM and you could pass the array parameter directly to the managed COBOL program without using SafeArray. The managed COBOL class could then format the array as a .NET array and pass it onto C# and do the same on the return trip to native COBOL.

Just a thought...