C# memorystream or any streams. open a file out of the stream

Question

1.00/5 (1 vote)

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hey
I want to know if can read or open a file a any steam without writing a file to the disc. This is what i have done so far.

C#

byte[] MyData = new byte[0]; //*this is my byte array. i wll get my bytes from my database,name,ect*// 
  MemoryStream stream = new MemoryStream(MyData); //now i have mydata in stream

from here i don't know to go on.All i need to know is how to open the file form the stream.
please i will really thank you for the help.

i also tried

C#

FileStream fs2= null;
         FileStream fs = new FileStream(@"C:\sd.txt",FileMode.Open);
         byte[] data = new byte[fs.Length];
         fs.Read(data,0,(int)fs.Length);

         fs2.Read(data,0,(int)fs.Length);
         fs.Close();

         System.Diagnostics.Process.Start(fs2.Name);

Posted 19-Aug-12 11:37am

RAssk2k

Updated 19-Aug-12 12:03pm

v2

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Comments

Sergey Alexandrovich Kryukov 19-Aug-12 20:19pm

What could it possibly mean: "open a file from the stream". What is the direction of moving data you need?
--SA

4 solutions

Solution 2

You can not create a new process from a stream. It can only be launched from a file on disk.

Posted 19-Aug-12 14:53pm

Dave Kreskowiak

Solution 4

What are you trying to do ?

FileStream is nothing but exposing a stream around the file. Also if you have a filestream you use it for
1. Byte level operations like encryption decryption.
2. Compress it using standard or custom deflator(zip, rar).
3. If you know the file format, then you can use Filestream to read its header(its fixed length information about the file, how data is packed on it etc). Headers are present for most of the files like JPEG, BMP etc.

Posted 19-Aug-12 18:27pm

Kuthuparakkal

Solution 3

When your file type is Image, it is possible. Like below codes:

C#

string fileName = "D:\\image.png";
byte[] buffer = File.ReadAllByte(fileName);
Stram stream = new MemoryStream(buffer);
this.PictureBox.Image = Image.FromStream(stream);

Posted 19-Aug-12 15:40pm

WebMaster

Updated 19-Aug-12 15:41pm

v2

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Christian Graus · Accepted Answer · 2012-08-19T14:20:00

Solution 1

You can't. It's in a stream, you can't do anything with it, apart from write it somewhere, or store it for your use. Windows can't open a program that is not on the hard drive, when it's in that pure binary form. You're just writing code at random, trying to do something impossible.

Posted 19-Aug-12 14:20pm

Christian Graus