CreateFileMapping, MapViewOfFile 实现文件共享 (.net4.0 built-in)

.NET 4.0 以前是这么做的.

http://www.cnblogs.com/read-acquisitions-docs/archive/2009/11/27/1612214.html

 

现在....

    class Program
    {
        static void Main(string[] args)
        {
            string file = @"C:\Users\user\Desktop\gts.txt";
            int length = (int)new FileInfo(file).Length;
            using (var mmf =
                MemoryMappedFile.CreateFromFile(
                                        file,
                                        FileMode.Open,
                                        "my_gts",       //共享内存在进程中的名字
                                        length,     //内存中分配大小, 太大会报内存不足, 不要超过需要读的block size就行,file size 更不行了
                                        MemoryMappedFileAccess.ReadWrite //按需设置, 否则下面的code会报UnauthorizedAccessException
                                        ))
            {

                long offset = 0;
                int len = 10;
                byte[] b = new byte[len];
                mmf.CreateViewStream().Read(b, 0, len);
                //在这里需要处理\0 一下 当长度和预期不一样的时候
                string s = Encoding.Default.GetString(b);


                using (var accessor = mmf.CreateViewAccessor(offset  , 10))
                {

                    UseDefinedNoReferenceMemberObject obj = new UseDefinedNoReferenceMemberObject();
                    obj.val = 1;
                    obj.ch = 'g';
                    //看类型大小, 比如int是4，写入后记事本打开看是4个方块, 其他参阅C++ struct sizeof 补齐方式
                    accessor.Write<UseDefinedNoReferenceMemberObject>(0, ref obj);
                    accessor.Read<UseDefinedNoReferenceMemberObject>(0, out obj);
                    

                }
            }

        }

        struct UseDefinedNoReferenceMemberObject
        {
            public int val;
            public char ch;
        }


    }