(精华)2020年6月27日 C#类库 共享内存帮助类
【摘要】
using System;
using System.Reflection;
using System.Runtime.InteropServices;
namespace Core.Util
{
...
using System;
using System.Reflection;
using System.Runtime.InteropServices;
namespace Core.Util
{
/// <summary>
/// 共享内存
/// </summary>
public class ShareMenmory
{
#region 导入类库及方法
[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;
#endregion
IntPtr m_hSharedMemoryFile = IntPtr.Zero;
IntPtr m_pwData = IntPtr.Zero;//共享内存地址
public bool m_bAlreadyExist = false;
bool m_bInit = false;
long m_MemSize = 0;
public ShareMenmory(string strName, long lngSize)
{
if (OpenExists(strName, lngSize) == false)
Init(strName, lngSize);
}
~ShareMenmory()
{
Close();
}
//初始化内存
public void Init(string strName, long lngSize)
{
m_MemSize = lngSize;
if (strName.Length > 0)
{
//创建内存共享体(INVALID_HANDLE_VALUE)
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;
}
else
{
if (GetLastError() == ERROR_ALREADY_EXISTS) //已经创建
{
m_bAlreadyExist = true;
}
else
{
m_bAlreadyExist = false;
}
}
//创建内存映射
try
{
m_pwData = MapViewOfFile(m_hSharedMemoryFile, FILE_MAP_WRITE, 0, 0, 0);
}
catch (Exception e)
{
Console.WriteLine(e);
}
if (m_pwData == IntPtr.Zero)
{
m_bInit = false;
CloseHandle(m_hSharedMemoryFile);
}
else
{
m_bInit = true;
m_bAlreadyExist = true;
}
}
}
/// <summary>
/// 获取共享内存
/// </summary>
/// <param name="mapName">内存名</param>
/// <param name="Size">大小</param>
public bool OpenExists(string mapName, long Size)
{
try
{
m_hSharedMemoryFile = OpenFileMapping(0x0002, true, mapName);
m_pwData = MapViewOfFile(m_hSharedMemoryFile, 0x0002, 0, 0, (uint)Size);
if (m_hSharedMemoryFile == IntPtr.Zero || m_pwData == IntPtr.Zero)
return false;
m_MemSize = Size;
m_bInit = true;
m_bAlreadyExist = true;
return true;
}
catch (Exception e)
{
Console.WriteLine(e);
return false;
}
}
//关闭共享内存
public void Close()
{
if (m_bInit)
{
UnmapViewOfFile(m_pwData);
CloseHandle(m_hSharedMemoryFile);
}
}
/// <summary>
/// 从共享内存读数据
/// </summary>
/// <param name="lngSize">数据长度</param>
/// <param name="ofset">指针偏移量</param>
/// <returns></returns>
public byte[] Read(int lngSize, int ofset)
{
byte[] bytData = new byte[lngSize];
Marshal.Copy(m_pwData + ofset, bytData, 0, lngSize);
return bytData;
}
/// <summary>
/// 将数据写入内存中
/// </summary>
/// <param name="bytData">需要写入的数据</param>
/// <param name="offset">目的内存地址偏移量</param>
public void Write(byte[] bytData, int offset)
{
Marshal.Copy(bytData, 0, m_pwData + offset, bytData.Length);
}
}
/// <summary>
/// 共享内存之操作泛型实体类
/// </summary>
/// <typeparam name="T">泛型参数</typeparam>
public class ShareMenmory<T>
{
#region 常量
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;
#endregion
IntPtr m_hSharedMemoryFile = IntPtr.Zero;//共享内存空间指针
IntPtr m_pwData = IntPtr.Zero;//共享内存地址
public bool m_bAlreadyExist = false;
bool m_bInit = false;
long m_MemSize = 0;
private int entityLength=0;
public ShareMenmory(string strName, long lngSize)
{
if (OpenExists(strName, lngSize) == false)
Init(strName, lngSize);
Type t = typeof(T);
object obj = Activator.CreateInstance(t);
MethodInfo method = t.GetMethod("getLength");
entityLength = (int)method.Invoke(obj, null);
}
~ShareMenmory()
{
Close();
}
//初始化内存
public void Init(string strName, long lngSize)
{
m_MemSize = lngSize;
if (strName.Length > 0)
{
//创建内存共享体(INVALID_HANDLE_VALUE)
m_hSharedMemoryFile = ShareMenmory.CreateFileMapping(INVALID_HANDLE_VALUE, IntPtr.Zero, (uint)PAGE_READWRITE, 0, (uint)lngSize, strName);
if (m_hSharedMemoryFile == IntPtr.Zero)
{
m_bAlreadyExist = false;
m_bInit = false;
}
else
{
if (ShareMenmory.GetLastError() == ERROR_ALREADY_EXISTS) //已经创建
{
m_bAlreadyExist = true;
}
else
{
m_bAlreadyExist = false;
}
}
//创建内存映射
try
{
m_pwData = ShareMenmory.MapViewOfFile(m_hSharedMemoryFile, FILE_MAP_WRITE, 0, 0, 0);
}
catch (Exception e)
{
Console.WriteLine(e);
}
if (m_pwData == IntPtr.Zero)
{
m_bInit = false;
ShareMenmory.CloseHandle(m_hSharedMemoryFile);
}
else
{
m_bInit = true;
m_bAlreadyExist = true;
}
}
}
/// <summary>
/// 获取共享内存
/// </summary>
/// <param name="mapName">内存名</param>
/// <param name="Size">大小</param>
public bool OpenExists(string mapName, long Size)
{
try
{
m_hSharedMemoryFile = ShareMenmory.OpenFileMapping(0x0002, true, mapName);
m_pwData = ShareMenmory.MapViewOfFile(m_hSharedMemoryFile, 0x0002, 0, 0, (uint)Size);
if (m_hSharedMemoryFile == IntPtr.Zero || m_pwData == IntPtr.Zero)
return false;
m_MemSize = Size;
m_bInit = true;
m_bAlreadyExist = true;
return true;
}
catch (Exception e)
{
Console.WriteLine(e);
return false;
}
}
//关闭共享内存
public void Close()
{
if (m_bInit)
{
ShareMenmory.UnmapViewOfFile(m_pwData);
ShareMenmory.CloseHandle(m_hSharedMemoryFile);
}
}
/// <summary>
/// 从共享内存读数据
/// </summary>
/// <param name="lngSize">数据长度</param>
/// <param name="ofset">指针偏移量</param>
/// <returns></returns>
public byte[] Read(int lngSize, int ofset)
{
byte[] bytData = new byte[lngSize];
Marshal.Copy(m_pwData + ofset, bytData, 0, lngSize);
return bytData;
}
/// <summary>
/// 将数据写入内存中
/// </summary>
/// <param name="bytData">需要写入的数据</param>
/// <param name="offset">目的内存地址偏移量</param>
public void Write(byte[] bytData, int offset)
{
Marshal.Copy(bytData, 0, m_pwData + offset, bytData.Length);
}
/// <summary>
/// 获取URL
/// </summary>
/// <param name="index">所需要获取URL的索引序号</param>
/// <returns></returns>
public string GetUrl(int index)
{
int offset = 1 + index * (entityLength + 1)+8;
return Extention.ToString(Read(200, offset)).Trim();
}
/// <summary>
/// 保存URL
/// </summary>
/// <param name="index">保存的位置（索引序号）</param>
/// <param name="url">URL</param>
public void SetUrl(int index, string url)
{
int offset = 1 + index * (entityLength + 1) + 8;
Write(url.ToBytes(), offset);
}
/// <summary>
/// 获取状态
/// </summary>
/// <param name="index">索引序号</param>
/// <returns></returns>
public string GetState(int index)
{
int offset = 1 + index * (entityLength + 1) + entityLength-2;
return Extention.ToString(Read(1, offset));
}
/// <summary>
/// 设置状态
/// </summary>
/// <param name="index">索引序号</param>
/// <param name="state">状态（0为未爬取，1为已经爬取）</param>
public void SetState(int index,int state)
{
int offset = 1 + index * (entityLength + 1) + entityLength - 2;
Write(state.ToString().ToBytes(),offset);
}
/// <summary>
/// 保存实体类
/// </summary>
/// <param name="index">索引序号</param>
/// <param name="t">实体类型</param>
public void SetEntity(int index,T t)
{
int offset = index*entityLength;
Write(t.EntityToJson().ToBytes(), offset);
}
public T GetEntity(int index)
{
string str = Extention.ToString(Read(entityLength, index * entityLength));
return str.ToEntity<T>();
}
}
}
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文章来源: codeboy.blog.csdn.net，作者：愚公搬代码，版权归原作者所有，如需转载，请联系作者。
原文链接：codeboy.blog.csdn.net/article/details/106983089
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