问题描述
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我很难弄清楚如何获取字符串"THIS IS A TEST MESSAGE"以存储在内存映射文件中,然后再将其拉出另一端.本教程说要使用字节数组.请原谅我是新手,请先尝试一下.
I am having a hard time figuring out how to get a string "THIS IS A TEST MESSAGE" to store in the memory mapped file and then pull it out on the other side. The tutorial says to use byte array. Forgive me I am new to this and trying on my own first.
谢谢,凯文
##Write to mapped file
using System;
using System.IO.MemoryMappedFiles;
class Program1
{
static void Main()
{
// create a memory-mapped file of length 1000 bytes and give it a 'map name' of 'test'
MemoryMappedFile mmf = MemoryMappedFile.CreateNew("test", 1000);
// write an integer value of 42 to this file at position 500
MemoryMappedViewAccessor accessor = mmf.CreateViewAccessor();
accessor.Write(500, 42);
Console.WriteLine("Memory-mapped file created!");
Console.ReadLine(); // pause till enter key is pressed
// dispose of the memory-mapped file object and its accessor
accessor.Dispose();
mmf.Dispose();
}
}
##read from mapped file
using System;
using System.IO.MemoryMappedFiles;
class Program2
{
static void Main()
{
// open the memory-mapped with a 'map name' of 'test'
MemoryMappedFile mmf = MemoryMappedFile.OpenExisting("test");
// read the integer value at position 500
MemoryMappedViewAccessor accessor = mmf.CreateViewAccessor();
int value = accessor.ReadInt32(500);
// print it to the console
Console.WriteLine("The answer is {0}", value);
// dispose of the memory-mapped file object and its accessor
accessor.Dispose();
mmf.Dispose();
}
}
推荐答案
您可以考虑编写字符串的长度,然后编写字符串的byte []形式.
例如,如果我想编写"Hello",则将其转换为字节:
You can consider writing the length of the string and then the byte[] form of your string.
For example if I would like to write "Hello" then I convert it into bytes:
byte[] Buffer = ASCIIEncoding.ASCII.GetBytes("Hello");
然后在写入内存映射文件时执行以下操作.
then do following while writing into the memory mapped file.
MemoryMappedFile mmf = MemoryMappedFile.CreateNew("test", 1000);
MemoryMappedViewAccessor accessor = mmf.CreateViewAccessor();
accessor.Write(54, (ushort)Buffer.Length);
accessor.WriteArray(54 + 2, Buffer, 0, Buffer.Length);
首先读取到位置54,然后读取2个字节,该长度为字符串的长度.然后,您可以读取该长度的数组并将其转换为字符串.
While reading first go to position 54 and read 2 bytes holding length of your string. Then you can read an array of that length and convert it into string.
MemoryMappedFile mmf = MemoryMappedFile.CreateNew("test", 1000);
MemoryMappedViewAccessor accessor = mmf.CreateViewAccessor();
ushort Size = accessor.ReadUInt16(54);
byte[] Buffer = new byte[Size];
accessor.ReadArray(54 + 2, Buffer, 0, Buffer.Length);
MessageBox.Show(ASCIIEncoding.ASCII.GetString(Buffer));
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