At Intertech we're trying to use the .NET DLL importer, wehave a structure defined in PowerBuilder called columninfo which has four elements: a_name (string), s_dbname(string), l_columnidsource (long), and l_columnidtarget (long).  So the structure has two strings and two longs.

 We then created a C# class with the following code:

namespace S_Interface.Models

{

    public class s_columninfo

    {

        public string s_name { get; set; }

        public string s_dbname { get; set; }

        public int? l_columnidsource { get; set; }

        public int? l_columnidtarget { get; set; }

        public s_columninfo()

        {

            s_name = string.Empty;

            s_dbname = string.Empty;

            l_columnidsource = 0;

            l_columnidtarget = 0;

        }

        public bool setter(s_columninfo columninfo)

        {

            s_name = columninfo.s_name;

            s_dbname = columninfo.s_dbname;

            l_columnidsource = columninfo.l_columnidsource;

            l_columnidtarget= columninfo.l_columnidtarget;

            return true;

        }

        public bool test()

        {

            return true;

        }

    }

}

We then used the DLL importer and built the wrapper code to make calls into the C# DLL.  BTW there were no errors identified by the .DLL importer.

 The following PowerBuilder code works:

//Declare and Create the .NET assembly wrapper 

nvo_s_columninfo lnv_s_columninfo

lnv_s_columninfo = create nvo_s_columninfo

//create the .NET object

boolean b

b = lnv_s_columninfo.of_createondemand()

//passing in the individual elements of the structure works fine

//we can see everything in the SnapDevelop debugger. 

lnv_s_columninfo.set_s_dbname("dbname")

lnv_s_columninfo.set_s_name("name")

lnv_s_columninfo.set_l_columnidsource(1)

lnv_s_columninfo.set_l_columnidtarget(1)

 //The following code doesn't work for us.

//We can't seem to pass the structure in entirety, and by the time it gets to the .NET assembly it is null.

nvo_s_columninfo lnv_s_columninfo

lnv_s_columninfo = create nvo_s_columninfo

//declare our structure

s_columninfo sc;

//create our .NET wrapper 

boolean b

b = lnv_s_columninfo.of_createondemand()

 //populate the structure

sc.s_dbname = "dbname"

sc.s_name = "name"

sc.l_columnidsource = 1

sc.l_columnidtarget = 1

//pass the structure into the assmebly

lnv_s_columninfo.setter(sc)

 //in the .NET debugger the structure passed in by PB is seen as Null in C#

//The setter method in the C# DLL has received a null value for s_columninfo

Any suggesions would be appreciated.  What is possible when passing structures into .NET?