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SharedMemory.cs
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SharedMemory.cs
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using System;
using System.Collections.Generic;
using System.Text;
using System.Runtime.InteropServices;
namespace ShareMemery
{
public class ShareMemLib
{
[DllImport("user32.dll", CharSet = CharSet.Auto)]
public static extern IntPtr SendMessage(IntPtr hWnd, int Msg, int wParam, IntPtr lParam);
[DllImport("Kernel32.dll", CharSet = CharSet.Auto)]
public static extern IntPtr CreateFileMapping(int hFile, IntPtr lpAttributes, uint flProtect, uint dwMaxSizeHi, uint dwMaxSizeLow, string lpName);
[DllImport("Kernel32.dll", CharSet = CharSet.Auto)]
public static extern IntPtr OpenFileMapping(int dwDesiredAccess, [MarshalAs(UnmanagedType.Bool)] bool bInheritHandle, string lpName);
[DllImport("Kernel32.dll", CharSet = CharSet.Auto)]
public static extern IntPtr MapViewOfFile(IntPtr hFileMapping, uint dwDesiredAccess, uint dwFileOffsetHigh, uint dwFileOffsetLow, uint dwNumberOfBytesToMap);
[DllImport("Kernel32.dll", CharSet = CharSet.Auto)]
public static extern bool UnmapViewOfFile(IntPtr pvBaseAddress);
[DllImport("Kernel32.dll", CharSet = CharSet.Auto)]
public static extern bool CloseHandle(IntPtr handle);
[DllImport("kernel32", EntryPoint = "GetLastError")]
public static extern int GetLastError();
const int ERROR_ALREADY_EXISTS = 183;
const int FILE_MAP_COPY = 0x0001;
const int FILE_MAP_WRITE = 0x0002;
const int FILE_MAP_READ = 0x0004;
const int FILE_MAP_ALL_ACCESS = 0x0002 | 0x0004;
const int PAGE_READONLY = 0x02;
const int PAGE_READWRITE = 0x04;
const int PAGE_WRITECOPY = 0x08;
const int PAGE_EXECUTE = 0x10;
const int PAGE_EXECUTE_READ = 0x20;
const int PAGE_EXECUTE_READWRITE = 0x40;
const int SEC_COMMIT = 0x8000000;
const int SEC_IMAGE = 0x1000000;
const int SEC_NOCACHE = 0x10000000;
const int SEC_RESERVE = 0x4000000;
const int INVALID_HANDLE_VALUE = -1;
IntPtr m_hSharedMemoryFile = IntPtr.Zero;
IntPtr m_pwData = IntPtr.Zero;
bool m_bAlreadyExist = false;
bool m_bInit = false;
long m_MemSize = 0;
public ShareMemLib()
{
}
~ShareMemLib()
{
Close();
}
/// <summary>
/// Init Shared Memory
/// </summary>
/// <param name="strName">Name of the shared memory</param>
/// <param name="lngSize">Size of the shared memory</param>
/// <returns></returns>
public int Init(string strName, long lngSize)
{
if (lngSize <= 0 || lngSize > 0x00800000) lngSize = 0x00800000;
m_MemSize = lngSize;
if (strName.Length > 0)
{
//Create shared memory pagefile
m_hSharedMemoryFile = CreateFileMapping(INVALID_HANDLE_VALUE, IntPtr.Zero, (uint)PAGE_READWRITE, 0, (uint)lngSize, strName);
if (m_hSharedMemoryFile == IntPtr.Zero)
{
m_bAlreadyExist = false;
m_bInit = false;
return 2; //Failed to create shared memory pagefile
}
else
{
if (GetLastError() == ERROR_ALREADY_EXISTS) //Already exist
{
m_bAlreadyExist = true;
}
else //New
{
m_bAlreadyExist = false;
}
}
//---------------------------------------
//Create shared memory map
m_pwData = MapViewOfFile(m_hSharedMemoryFile, FILE_MAP_WRITE, 0, 0, (uint)lngSize);
if (m_pwData == IntPtr.Zero)
{
m_bInit = false;
CloseHandle(m_hSharedMemoryFile);
return 3; //Failed to create shared memory map
}
else
{
m_bInit = true;
if (m_bAlreadyExist == false)
{
//Init
}
}
//----------------------------------------
}
else
{
return 1; //Wrong arguments
}
return 0; //Create successful
}
/// <summary>
/// Close shared memory
/// </summary>
public void Close()
{
if (m_bInit)
{
UnmapViewOfFile(m_pwData);
CloseHandle(m_hSharedMemoryFile);
}
}
/// <summary>
/// Read data
/// </summary>
/// <param name="bytData">Data</param>
/// <param name="lngAddr">Address of the data</param>
/// <param name="lngSize">Size of the data</param>
/// <returns></returns>
public int Read(ref byte[] bytData, int lngAddr, int lngSize)
{
if (lngAddr + lngSize > m_MemSize) return 2; //Length exceeded
if (m_bInit)
{
Marshal.Copy(m_pwData, bytData, lngAddr, lngSize);
}
else
{
return 1; //Shared memory has not initializeed
}
return 0; //Read Successful
}
/// <summary>
/// Write data
/// </summary>
/// <param name="bytData">Data</param>
/// <param name="lngAddr">Address of the data</param>
/// <param name="lngSize">Size of the data</param>
/// <returns></returns>
public int Write(byte[] bytData, int lngAddr, int lngSize)
{
if (lngAddr + lngSize > m_MemSize) return 2; //Length exceeded
if (m_bInit)
{
Marshal.Copy(bytData, lngAddr, m_pwData, lngSize);
}
else
{
return 1; //Shared memory has not initializeed
}
return 0; //Write successful
}
public static byte[] StructToBytes(object structObj, int size = 0)
{
if (size == 0)
{
size = Marshal.SizeOf(structObj); //Calc the size of the structure
}
IntPtr buffer = Marshal.AllocHGlobal(size); //Allocate memory
try
{
Marshal.StructureToPtr(structObj, buffer, false); //Fill memory space
byte[] bytes = new byte[size];
Marshal.Copy(buffer, bytes, 0, size); //Fill the array
return bytes;
}
catch (Exception ex)
{
return null;
}
finally
{
Marshal.FreeHGlobal(buffer); //Free memory
}
}
public static object BytesToStruct(byte[] bytes, Type strcutType, int nSize)
{
if (bytes == null)
{
return null;
}
int size = Marshal.SizeOf(strcutType);
IntPtr buffer = Marshal.AllocHGlobal(nSize);
try
{
Marshal.Copy(bytes, 0, buffer, nSize);
return Marshal.PtrToStructure(buffer, strcutType);
}
catch (Exception ex)
{
return null;
}
finally
{
Marshal.FreeHGlobal(buffer); //Free memory
}
}
public int Read(ref object input, Type strcutType)
{
int length = Marshal.SizeOf(strcutType);
byte[] bytData = new byte[length];
int error = Read(ref bytData, 0, length);
input = BytesToStruct(bytData, strcutType, length);
return error;
}
public int Write(ref object output, Type strcutType)
{
int length = Marshal.SizeOf(strcutType);
byte[] bytdata = StructToBytes(output, length);
int error = Write(bytdata, 0, length);
return error;
}
}
}