C#: Create an byte array with int and hex values

Question

I need to create a an byte array with hex and int values.

For example:

int value1 = 13;
int value2 = 31;
byte[] mixedbytes = new byte[] {0x09, (byte)value1, (byte)value2};

Problem: The 31 is converted to 0x1F. It should be 0x31. I've tried to convert the int values to string and back to bytes but that didn't solve the problem. The integers have never more than two digits.

0x1f if the hex representation of the integer 31. 0x31 would be 49. — TZHX
– TZHX, Commented May 26, 2016 at 6:15
Ok - sorry I wasn't clear enough: I need to write an byte array or string array to that device. That device has to store the number 31 as the number 31 - not 1F. — FikLi
– FikLi, Commented May 26, 2016 at 6:16

CamW · Accepted Answer · 2016-05-26 06:24:31Z

2

Try this:

int value1 = 0x13;
int value2 = 0x31;
byte[] mixedbytes = new byte[] { 0x09, (byte)value1, (byte)value2 };

Also, you don't seem to understand conversion between decimal and hex. 31 in decimal is 1F in hex, expecting it to be 31 in hex is a bad expectation for a better understanding of the conversion between decimal and hex, please have a look here: http://www.wikihow.com/Convert-from-Decimal-to-Hexadecimal

answered May 26, 2016 at 6:24

CamW

3,37928 silver badges34 bronze badges

Sign up to request clarification or add additional context in comments.

2 Comments

TZHX Over a year ago

If they want (as they claim) the integer values of 13 and 31; this is not a solution.

CamW Over a year ago

It is a solution if the OP, reads the article and understands the conversion and can then decide for themselves how to proceed. Also, the OP never indicated that they wanted a decimal value of 13 and 31, only that they wanted a hex value of 0x31, you're assuming they want 13 and 31. This is precisely why I included the article because it's unclear what they want and they need to understand the conversion to continue.

Justin CI · Accepted Answer · 2016-05-26 06:58:34Z

0

I think you can try this method

    string i = "10";
    var b =  Convert.ToByte(i, 16)

In this method 10 will be stored as 0x10

answered May 26, 2016 at 6:58

Justin CI

2,7411 gold badge18 silver badges36 bronze badges

Comments

Luaan · Accepted Answer · 2016-05-26 07:51:33Z

0

This format is commonly known as Binary Coded Decimal (BCD). The idea is that the nibbles in the byte each contain a single decimal digit.

In C#, you can do this conversion very easily:

var number = 31;
var bcd = (number / 10) * 16 + (number % 10);

answered May 26, 2016 at 7:51

Luaan

64.1k7 gold badges107 silver badges126 bronze badges

Collectives™ on Stack Overflow

C#: Create an byte array with int and hex values

3 Answers 3

2 Comments

Comments

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

3 Answers 3

2 Comments

Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Related