Csharp/CSharp Tutorial/File Directory Stream/MemoryStream

Demonstrate MemoryStream.

<source lang="csharp">using System; using System.IO;

class MainClass {

 public static void Main() {   
   byte[] storage = new byte[255]; 

   MemoryStream memstrm = new MemoryStream(storage); 

   StreamWriter memwtr = new StreamWriter(memstrm); 
   StreamReader memrdr = new StreamReader(memstrm); 

   for(int i=0; i < 10; i++) 
      memwtr.WriteLine("byte [" + i + "]: " + i); 

   memwtr.WriteLine("."); 

   memwtr.Flush(); 

   Console.WriteLine("Reading from storage directly: "); 

   foreach(char ch in storage) { 
     if (ch == ".") break; 
     Console.Write(ch); 
   } 

   Console.WriteLine("\nReading through memrdr: "); 

   memstrm.Seek(0, SeekOrigin.Begin); // reset file pointer  

   string str = memrdr.ReadLine(); 
   while(str != null) { 
     Console.WriteLine(str); 
     str = memrdr.ReadLine(); 
     if(str.rupareTo(".") == 0) break; 
   }  
 }  

}</source>

Reading from storage directly:
byte [0]: 0
byte [1]: 1
byte [2]: 2
byte [3]: 3
byte [4]: 4
byte [5]: 5
byte [6]: 6
byte [7]: 7
byte [8]: 8
byte [9]: 9
Reading through memrdr:
byte [0]: 0
byte [1]: 1
byte [2]: 2
byte [3]: 3
byte [4]: 4
byte [5]: 5
byte [6]: 6
byte [7]: 7
byte [8]: 8
byte [9]: 9

MemoryStream: Write bytes and dump to a file

<source lang="csharp">using System; using System.IO; public class MainClass {

   public static int Main(string[] args)
   {
   MemoryStream myMemStream = new MemoryStream();
   myMemStream.Capacity = 256;
   for(int i = 0; i < 256; i++)
     myMemStream.WriteByte((byte)i);
   myMemStream.Position = 0;
   for(int i = 0; i < 256; i++)
     Console.Write(myMemStream.ReadByte());  
   Console.WriteLine();
   FileStream dumpFile = new FileStream("Dump.dat", FileMode.Create, FileAccess.ReadWrite);
   myMemStream.WriteTo(dumpFile);
   byte[] bytesinMemory = myMemStream.ToArray();
   myMemStream.Close();
   for(int i = 0; i < bytesinMemory.Length; i++)
     Console.Write(bytesinMemory[i]);
   return 0;
   }

}</source>

0123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354
5556575859606162636465666768697071727374757677787980818283848586878889909192939495969798991001011021
0310410510610710810911011111211311411511611711811912012112212312412512612712812913013113213313413513
6137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169
1701711721731741751761771781791801811821831841851861871881891901911921931941951961971981992002012022
0320420520620720820921021121221321421521621721821922022122222322422522622722822923023123223323423523
6237238239240241242243244245246247248249250251252253254255
0123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354
5556575859606162636465666768697071727374757677787980818283848586878889909192939495969798991001011021
0310410510610710810911011111211311411511611711811912012112212312412512612712812913013113213313413513
6137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169
1701711721731741751761771781791801811821831841851861871881891901911921931941951961971981992002012022
0320420520620720820921021121221321421521621721821922022122222322422522622722822923023123223323423523
6237238239240241242243244245246247248249250251252253254255

Read data in FileStream into MemoryStream

<source lang="csharp">using System; using System.Windows.Forms; using System.IO; class MainClass {

 public static void SaveMemoryStream(MemoryStream ms, string FileName)
 {
   FileStream outStream = File.OpenWrite(FileName);
   ms.WriteTo(outStream);
   outStream.Flush();
   outStream.Close();
 }
 public static void Main() 
 {
   FileStream inStream = File.OpenRead("c:\\text.txt");
   MemoryStream storeStream = new MemoryStream();
   storeStream.SetLength(inStream.Length);
   inStream.Read(storeStream.GetBuffer(), 0, (int)inStream.Length);
   storeStream.Flush();
   inStream.Close();
   SaveMemoryStream(storeStream, "C:\\text.txt" + ".bak");
   storeStream.Close();
 }

}</source>

Save the MemoryStream as a file

<source lang="csharp">using System; using System.Windows.Forms; using System.IO; class MainClass {

 public static void SaveMemoryStream(MemoryStream ms, string FileName)
 {
   FileStream outStream = File.OpenWrite(FileName);
   ms.WriteTo(outStream);
   outStream.Flush();
   outStream.Close();
 }
 public static void Main() 
 {
   FileStream inStream = File.OpenRead("c:\\text.txt");
   MemoryStream storeStream = new MemoryStream();
   storeStream.SetLength(inStream.Length);
   inStream.Read(storeStream.GetBuffer(), 0, (int)inStream.Length);
   storeStream.Flush();
   inStream.Close();
   SaveMemoryStream(storeStream, "C:\\text.txt" + ".bak");
   storeStream.Close();
 }

}</source>