【hBifTs】.NET中使用Mapping File 的API :)
在.NET中,进行程序间通信,可以使用的方法很多,比如.NET Remoting,WebService.等等..
但是使用上述方法太过于麻烦.不是很轻便..
在Win32中,一般要完成上述功能,方法也很多,一个比较通用的方法就是直接使用内存映射文件.Mapping File.
.NET FX1.0提供了P/Invoke,可能通过这个来直接调用Win32的API.这里我来演示一下这个方法.
要使用P/Invoke,我们得加入这个命名空间: System.Runtime.InteropServices
然后使用DllImportAttribute来导入我们所要用的Win32 API:
DllImport#region DllImport
[StructLayout(LayoutKind.Sequential)] private struct SECURITY_ATTRIBUTES
{ int nLength; int lpSecurityDescriptor; bool bInheritHandle; 
} [DllImport("kernel32",CharSet = CharSet.Auto)] private static extern int CreateFileMapping( int hFile, int lpSecurityAttributes, int flProtect, int dwMaximumSizeHigh, int dwMaximumSizeLow, [MarshalAs(UnmanagedType.LPTStr)] string lpName ); [DllImport("kernel32",CharSet = CharSet.Auto)] private static extern int OpenFileMapping( int dwDesiredAccess, bool bInheritHandle, [MarshalAs(UnmanagedType.LPTStr)] string lpName ); [DllImport("kernel32",CharSet = CharSet.Auto)] private static extern bool UnmapViewOfFile(int lpBaseAddress); [DllImport("kernel32",CharSet = CharSet.Auto)] private static extern void CloseHandle(int Handle); [DllImport("kernel32",CharSet = CharSet.Auto)] private static extern int MapViewOfFile( int hFileMappingObject, int dwDesiredAccess, int dwFileOffsetHigh, int dwFileOffsetLow, int dwNumberOfBytesToMap );
#endregion由于原始的API使用到了多个Enum,我们也实现这些个Enum,以方便以后的使用.
Mapping File Enum Info#region Mapping File Enum Info public enum ProtectionTypes:int { PageReadOnly = 0x2, PageReadWrite = 0x4, PageWriteCopy = 0x8 } public enum SectionTypes:int { SecCommit = 0x8000000, SecImage = 0x1000000, SecNoCache = 0x10000000, SecReserve = 0x4000000 } public enum AccessTypes:int { Copy = 0x1, Read = 0x4, Write = 0x2, Full = 0xF001F } #endregion接下来,就是把这些函数进行封装了:)
这里,我把这些函数封装到一个Class中,其Class的定义如下:
SharedMemory#region SharedMemory public class SharedMemory : IDisposable { Private & Public Variable#region Private & Public Variable private const int INVALID_HANDLE_VALUE = -1; private int hMap = INVALID_HANDLE_VALUE; private int lpAddr = 0; private int size; private int length; public int MapHandle { get{return hMap;} } public int Address { get{return lpAddr;} } public int Size { get{ return size;} } public int Length { get{ return length;} } #endregion Constructor#region Constructor public SharedMemory(){} public SharedMemory(int Size,string Name) : this( Size,Name,ProtectionTypes.PageReadWrite,SectionTypes.SecCommit,AccessTypes.Full){} public SharedMemory(int Size, string Name, ProtectionTypes Protection, SectionTypes Section, AccessTypes Access ) { Create(Size, Name, Protection, Section, Access); } #endregion Common Function#region Common Function public void Create( int Size,string Name) { Create( Size,Name,ProtectionTypes.PageReadWrite,SectionTypes.SecCommit,AccessTypes.Full); } public void Create( int Size, string Name,ProtectionTypes Protection, SectionTypes Section, AccessTypes Access) { Dispose(); size = Size; hMap = CreateFileMapping(INVALID_HANDLE_VALUE, 0, (int)Protection|(int)Section, 0, Size, Name); if(hMap ==0) { throw new ApplicationException("Can't Create MappingFile " + Name); } lpAddr = MapViewOfFile(hMap, (int)Access, 0, 0, Size); } public void Open(int Size, string Name){this.Open(Size, Name, 0, AccessTypes.Read);} public void Open(int Size, string Name, AccessTypes Access)
来自 “ ITPUB博客 ” ，链接：https://blog.itpub.net/12639172/viewspace-343241/ ，如需转载，请注明出处，否则将追究法律责任。
请登录后发表评论
登录
全部评论
北京盛拓优讯信息技术有限公司. 版权所有 京ICP备16024965号-8 北京市公安局海淀分局网监中心备案编号：11010802021510 niuxiaotong@pcpop.com 17352615567 未成年人举报专区
广播电视节目制作经营许可证(京) 字第1234号 中国互联网协会会员
违法和不良信息举报电话:18101376593