SQLite Forum

That you ask for the actual code raises doubts in my mind; however, to save time:

```
using System;
using System.Runtime.InteropServices;
using System.Text;

namespace ConsoleApp1
{
    class Program
    {
        [DllImport("sqlite3.dll", EntryPoint = "sqlite3_exec", CharSet = CharSet.Ansi, CallingConvention = CallingConvention.Cdecl)]
        static extern int sqlite3_exec(IntPtr dbHandle, byte[] sql, Callback callback, string args, out IntPtr errmsg);
        [DllImport("sqlite3.dll", EntryPoint = "sqlite3_open", CallingConvention = CallingConvention.Cdecl)]
        static extern int sqlite3_open(string filename, out IntPtr dbPtr); //[MarshalAs(UnmanagedType.LPTStr)]
        [DllImport("sqlite3.dll", EntryPoint = "sqlite3_close_v2", CallingConvention = CallingConvention.Cdecl)]
        static extern int sqlite3_close_v2(IntPtr dbHandle);//        int sqlite3_close_v2(sqlite3*);
        internal delegate int Callback(IntPtr p, int n, [In] [MarshalAs(UnmanagedType.LPArray, ArraySubType = UnmanagedType.LPStr, SizeParamIndex = 1)]  string[] names, [In][MarshalAs(UnmanagedType.LPArray, ArraySubType = UnmanagedType.LPStr, SizeParamIndex = 1)] string[] values);

        static void Main(string[] args)
        {
            Callback IR = new Callback(IterateResults);
            IntPtr dbHandle;
            IntPtr errMsg = IntPtr.Zero;
            if (0 == sqlite3_open(@"d:\sqlite32\db\chinook.db", out dbHandle))
            {
                int rc = sqlite3_exec(dbHandle, Encoding.Default.GetBytes(@"select * from employees;"), IR, "First Argument of callback", out errMsg);
                // CAllback on previous line failes!!!
            }
            else
            {
                Console.WriteLine("failed to open database");
            }
        }
        public static int IterateResults(IntPtr unused, int n, string[] values, string[] names)
        {
            for (int i = 0; i < n; i++)
            {
                Console.WriteLine($"{names[i]}={values[i]}");
            }
            return 0;
        }
    }
}

```
This is a Console Application; using Visual Studio 2017, tested the build with framework 4.7.2, Platform target <i>Any CPU</i> and <i>Prefer 32-bit</i> enabled.
If you need to know how to reference SQLite3.DLL version 3.34, [see thread [3] here](https://sqlite.org/forum/forumpost/f5e7f7f368?t=h).