convert file to byte

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3.33/5 (3 votes)

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C#

how i can convert file to bytes
and change this byte
and save a change with new file
thnx for any help

Posted 23-Jan-11 1:54am

Mostafa Elsadany

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Nish Nishant · Accepted Answer · 2011-01-23T01:55:00

Solution 1

Use File.ReadAllBytes to read the bytes in the file.
Directly modify the returned byte array as you please.
Use File.WriteAllBytes to save the modified bytes.

[Edit]
----------

Sample code below (requsted by OP):

C#

byte[] bytes = File.ReadAllBytes(@"d:\abc.pdf");
bytes[10] = 34;
bytes[11] = 89;
File.WriteAllBytes(@"d:\abc.pdf", bytes);

Posted 23-Jan-11 1:55am

Nish Nishant

Updated 23-Jan-11 2:24am

v3

Comments

Mostafa Elsadany 23-Jan-11 8:22am

can you give me example by code
i think that is way to do this by get and post bytes of file
anyway
sorry for my english
but if you have any sample code will be good

Nish Nishant 23-Jan-11 8:24am

byte[] bytes = File.ReadAllBytes(@"d:\abc.pdf");
bytes[10] = 34;
bytes[11] = 89;
File.WriteAllBytes(@"d:\abc.pdf", bytes);

Mostafa Elsadany 23-Jan-11 8:30am

thanks for your help

Nish Nishant 23-Jan-11 8:34am

You're welcome.

Mostafa Elsadany 23-Jan-11 8:31am

that way by get and post i used it in vb6 but i don't remember that
when use this way
i can't open file
do you know him

Nish Nishant 23-Jan-11 8:35am

I am sorry. I did not understand what you meant. Know who?

Espen Harlinn 23-Jan-11 8:38am

5+ Good answer, nice and simple

Nish Nishant 23-Jan-11 8:39am

Thanks.

Sergey Alexandrovich Kryukov 23-Jan-11 12:23pm

Simple as that - my 5.

OP reply "give me example by code" is a shame: it's not possible to learn anything this way. The most effective way is doing things with one's own hands, even if the code sample is available.

Mostafa Elsadany 23-Jan-11 14:36pm

10 * Good answer,
thanks for help

Nish Nishant 23-Jan-11 18:20pm

You're welcome.

Espen Harlinn · Accepted Answer · 2011-01-23T02:37:00

Nishant Sivakumar has provided a good answer, but I'd like to point to an alternative suitable for larger files:

Use MemoryMappedFile[^] with MemoryMappedViewAccessor[^] to read and write data.

Perhaps like this (copied from the documentation):

C#

using (var accessor = mmf.CreateViewAccessor(offset, length))
{

  int colorSize = Marshal.SizeOf(typeof(MyColor));
  MyColor color;

  // Make changes to the view.
  for (long i = 0; i < length; i += colorSize)
  {
    accessor.Read(i, out color);
    color.Brighten(10);
    accessor.Write(i, ref color);
  }
}

This ability to work with memory mapped files was introduced with .Net 4 - so it's easy to overlook.

Regards
Espen Harlinn