内存映射文件MemoryMappedFile使用

2016-12-28 19:17:10来源:cnblogs.com作者:疯子哥哥人点击

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参考资料: http://blog.csdn.net/bitfan/article/details/4438458

 

所谓内存映射文件,其实就是在内存中开辟出一块存放数据的专用区域,这区域往往与硬盘上特定的文件相对应。进程将这块内存区域映射到自己的地址空间中,访问它就象是访问普通的内存一样。

.NET中,使用MemoryMappedFile对象表示一个内存映射文件,通过它的CreateFromFile()方法根据磁盘现有文件创建内存映射文件,调用这一方法需要提供一个与磁盘现有文件相对应的FileStream对象。

 

需要保存的类:

[Serializable]    public class MyImg    {        public Image img;        public string name;    }

 

MMF定义:

public class MMF    {        private MemoryMappedFile file = null;        private MemoryMappedViewStream strem = null;        private MemoryMappedViewAccessor acces = null;        public MMF()        {            file = MemoryMappedFile.CreateOrOpen("myMMF", 1024 * 1024, MemoryMappedFileAccess.ReadWrite);            strem = file.CreateViewStream();            acces = file.CreateViewAccessor();        }        public void Write(int value)        {            acces.Write(0, value);        }        public int Read()        {            int value;            acces.Read(0, out value);            return value;        }        public void WriteClass(MyImg img)        {            IFormatter format = new BinaryFormatter();            format.Serialize(strem, img);        }        public MyImg ReadClass()        {            IFormatter format = new BinaryFormatter();            return format.Deserialize(strem) as MyImg;        }    }

 

界面代码:

private void button1_Click(object sender, EventArgs e)        {            using (OpenFileDialog dlg = new OpenFileDialog())            {                dlg.Filter = "*.png|*.png";                if (dlg.ShowDialog() == DialogResult.OK)                {                    this.pictureBox1.Image = Image.FromFile(dlg.FileName);                    this.label1.Text = Path.GetFileNameWithoutExtension(dlg.FileName);                }            }        }        private void button2_Click(object sender, EventArgs e)        {            MyImg img = new MyImg() { img = this.pictureBox1.Image, name = this.label1.Text };            myFile.WriteClass(img);        }        private void button3_Click(object sender, EventArgs e)        {            MyImg img = myFile.ReadClass();            this.pictureBox1.Image = img.img;            this.label1.Text = img.name;        }        private void button4_Click(object sender, EventArgs e)        {            label2.Text = myFile.Read().ToString();        }        private void button5_Click(object sender, EventArgs e)        {            myFile.Write(int.Parse(this.textBox1.Text));        }

 

 

参考资料: http://blog.csdn.net/bitfan/article/details/4438458

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