Memory-mapped files memorymappedfile using

Reference: http://blog.csdn.net/bitfan/article/details/4438458

The so-called memory map file, in fact, is to open up a piece of memory in the private area of the data, which often corresponds to a specific file on the hard disk. The process maps this area of memory to its own address space and accesses it as if it were accessing normal memory.

In the . NET, use the MemoryMappedFile object to represent a memory-mapped file, and through its createfromfile () method to create a memory-mapped file based on the disk's existing files, call this method to provide a corresponding to the disk's existing file The FileStream object.

Classes that need to be saved:

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

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MMF definition:

 Public classMMF {PrivateMemoryMappedFile file =NULL; PrivateMemorymappedviewstream Strem =NULL; PrivateMemorymappedviewaccessor acces =NULL;  PublicMMF () {file= Memorymappedfile.createoropen ("MYMMF",1024x768*1024x768, Memorymappedfileaccess.readwrite); Strem=file.            Createviewstream (); Acces=file.        Createviewaccessor (); }         Public voidWrite (intvalue) {acces. Write (0, value); }         Public intRead () {intvalue; Acces. Read (0, outvalue); returnvalue; }         Public voidwriteclass (myimg img) {iformatter format=NewBinaryFormatter (); Format.        Serialize (Strem, IMG); }         Publicmyimg ReadClass () {iformatter format=NewBinaryFormatter (); returnFormat. Deserialize (Strem) asmyimg; }    }

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Interface code:

Private voidButton1_Click (Objectsender, EventArgs e) {            using(OpenFileDialog dlg =NewOpenFileDialog ()) {dlg. Filter="*.png|*.png"; if(DLG. ShowDialog () = =DialogResult.OK) { This. pictureBox1.Image =Image.FromFile (dlg.                    FileName);  This. Label1. Text =path.getfilenamewithoutextension (dlg.                FileName); }            }        }        Private voidButton2_Click (Objectsender, EventArgs e) {myimg img=NewMyimg () {img = This. picturebox1.image, name = This. Label1.            Text};        Myfile.writeclass (IMG); }        Private voidButton3_Click (Objectsender, EventArgs e) {myimg img=Myfile.readclass ();  This. pictureBox1.Image =img.img;  This. Label1. Text =Img.name; }        Private voidButton4_Click (Objectsender, EventArgs e) {Label2. Text=Myfile.read ().        ToString (); }        Private voidButton5_click (Objectsender, EventArgs e) {Myfile.write (int. Parse ( This. TextBox1.Text)); }

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Reference: http://blog.csdn.net/bitfan/article/details/4438458

Memory-mapped files memorymappedfile using