Adapter_BackEndFunctions.cs

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using System;
using System.Collections.Generic;
using System.Linq;
using System.Runtime.InteropServices;
using System.Text;
using System.Threading.Tasks;
 
namespace DesignPatternExamples_csharp
{
    internal static class DataReadWriteFunctions
    {
        public const int DDR_MAX_OFFSET = 32;        
 
 
        public enum DDR_ErrorCode
        {
            DDR_ErrorCode_Success = 0,               
            DDR_ErrorCode_Block_Already_Opened = 1,  
            DDR_ErrorCode_Block_Not_Opened = 2,      
            DDR_ErrorCode_Invalid_Block_Name = 3,    
            DDR_ErrorCode_Invalid_Handle = 4,        
            DDR_ErrorCode_Invalid_Offset = 5,        
            DDR_ErrorCode_Null_Argument = 6          
        }
 
        public const string BLOCK_NAME_0 = "gorp";
        public const string BLOCK_NAME_1 = "baba";
        public const string BLOCK_NAME_2 = "yaga";
 
 
        private const string dll = "Adapter_BackEnd";
 
        [DllImport(dll, CallingConvention = CallingConvention.Cdecl,
        ExactSpelling = true, CharSet = CharSet.Ansi)]
        internal static extern
        DDR_ErrorCode DDR_OpenMemoryBlock(string blockName, out Int32 dataHandle);
 
        [DllImport(dll, CallingConvention = CallingConvention.Cdecl,
        ExactSpelling = true, CharSet = CharSet.Ansi)]
        internal static extern
        DDR_ErrorCode DDR_CloseMemoryBlock(Int32 dataHandle);
 
        [DllImport(dll, CallingConvention = CallingConvention.Cdecl,
        ExactSpelling = true, CharSet = CharSet.Ansi)]
        internal static extern
        DDR_ErrorCode DDR_GetMemorySize(Int32 dataHandle, out Int32 memorySizeInChunks);
 
        [DllImport(dll, CallingConvention = CallingConvention.Cdecl,
        ExactSpelling = true, CharSet = CharSet.Ansi)]
        internal static extern
        DDR_ErrorCode DDR_GetDataChunk(Int32 dataHandle, Int32 chunkOffset, out UInt32 value);
 
        [DllImport(dll, CallingConvention = CallingConvention.Cdecl,
        ExactSpelling = true, CharSet = CharSet.Ansi)]
        internal static extern
        DDR_ErrorCode DDR_SetDataChunk(Int32 dataHandle, Int32 chunkOffset, UInt32 value);
    }
}