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: http://stackoverflow.com/questions/381508/can-a-byte-array-be-written-to-a-file-in-c, http://stackoverflow.com/questions/128674/what-is-the-most-efficient-way-to-save-a-byte-array-as-a-file-on-disk-in-c, http://stackoverflow.com/questions/224239/whats-the-best-way-to-write-a-short-array-to-a-file-in-c — Cody Gray - on strike, Dec 23 '10 at 08:04
Use BitConverter.ToString(data) to create a string that you can write to a text file. — Hans Passant, Dec 23 '10 at 11:12

score 8 · Answer 1 · answered Dec 23 '10 at 07:52

8

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

And even easier,

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

answered Dec 23 '10 at 07:52

H H

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When i use the aboe function some non readable characters are displayed in the file. I want the data to be displayed exactly. – user209293 Dec 23 '10 at 07:58
3

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. – Andrei Sosnin Dec 23 '10 at 08:12
@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. – H H Dec 23 '10 at 14:56

score 1 · Answer 2 · edited Jan 30 '18 at 01:56

1

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();

edited Jan 30 '18 at 01:56

Lee Taylor

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answered Dec 23 '10 at 09:09

Rajesh Kumar G

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open the output file in microsoft visual studio,u will see the result that what do you want in binary format – Rajesh Kumar G Dec 23 '10 at 09:11

score 0 · Answer 3 · answered Dec 23 '10 at 07:54

0

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

answered Dec 23 '10 at 07:54

Botz3000

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When i use the aboe function some non readable characters are displayed in the file. I want the data to be displayed exactly – user209293 Dec 23 '10 at 08:01
@user209293, use a hex editor. Don't expect a text editor to display you non printable characters like 0x02. – Darin Dimitrov Dec 23 '10 at 08:14
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. – Botz3000 Dec 23 '10 at 08:20

score 0 · Accepted Answer · answered Dec 23 '10 at 08:09

0

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.

answered Dec 23 '10 at 08:09

Anton

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

4 Answers4