How can I write a binary array to a file in C#?

Question

I have to write the below binary array into a file:

byte[] data = new byte[] { 0x55, 0xAA, 0x02};

I want to put the exact data into the file (55,AA,02). Please let me know how to do it.

Possible duplicates: stackoverflow.com/questions/381508/…, stackoverflow.com/questions/128674/…, stackoverflow.com/questions/224239/… — Cody Gray
– Cody Gray ♦, Commented Dec 23, 2010 at 8:04
Use BitConverter.ToString(data) to create a string that you can write to a text file. — Hans Passant
– Hans Passant, Commented Dec 23, 2010 at 11:12

Henk Holterman · Accepted Answer · 2010-12-23 07:52:37Z

9

You can use the Stream.Write(byte[] buffer) overload.

And even easier,

 System.IO.File.WriteAllBytes("fileName", data);

answered Dec 23, 2010 at 7:52

Henk Holterman

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3 Comments

user209293 Over a year ago

When i use the aboe function some non readable characters are displayed in the file. I want the data to be displayed exactly.

Andrei Sosnin Over a year ago

It's because you're writing characters, which are not printable. 0x02 is not a 'printable' character code. You want to use a hex editor to view your output file and verify it wrote data exactly.

Henk Holterman Over a year ago

@user209293 Your data has non-printable codes when viewed a s ASCII/ANSI/UTF8. So you'll have to more precise in what result you want. Currently your comments contradict the req in the question.

Lee Taylor · Accepted Answer · 2018-01-30 01:56:03Z

Please try the following:

FileStream fs = new FileStream(Application.StartupPath + "\\data.bin", FileMode.Create); BinaryWriter bw = new BinaryWriter(fs); byte[] data = new byte[] { 0x55, 0xAA, 0x02 }; bw.Write(data); bw.Close(); fs.Close();

open the output file in microsoft visual studio,u will see the result that what do you want in binary format

Anton · Accepted Answer · 2010-12-23 08:09:51Z

Iirc you can use

string content = BitConverter.ToString(data);

to retrieve a string containing the content and then write that string to the File you want.

Botz3000 · Accepted Answer · 2010-12-23 07:54:58Z

0

You can use File.WriteAllBytes(string path, byte[] bytes).

answered Dec 23, 2010 at 7:54

Botz3000

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3 Comments

user209293 Over a year ago

When i use the aboe function some non readable characters are displayed in the file. I want the data to be displayed exactly

Darin Dimitrov Over a year ago

@user209293, use a hex editor. Don't expect a text editor to display you non printable characters like 0x02.

Botz3000 Over a year ago

If you don't want to write the exact data, but rather the string representation of your byte values into a file, maybe you should rephrase your question.

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