# Reading Byte data and returning desired values

• ### Question

• I am trying to read 2 bytes from a data stream, FD 7F.

FD is in location 0

7F is in location 1

I need to read these values as a combination starting at location 1 then 0 = 7FFD

convert this to an int and display in a label.

also.

read 2 bytes from a different stream, FF 7F

FF is in location 4

7F is in location 5

I need to read these values as a combination starting at location 5 then 4 = 7FFF

7FFF convert to DEC 32767

required value = -1 + (32767 multiplied by 6.103515625e-5)

Round up to 1 decimal place and output to a label.

Any Help would be greatly appreciated.

Wednesday, February 27, 2019 10:49 AM

### All replies

• If you already know how to read bytes from streams and display numbers in labels, then check this example:

```byte byte0 = 0xFD;
byte byte1 = 0x7F;

byte[] bytes = { byte0, byte1 };

Int16 value1 = BitConverter.ToInt16( bytes, 0 );

byte byte4 = 0xFF;
byte byte5 = 0x7F;

bytes = new[] { byte4, byte5 };

Int16 value2 = BitConverter.ToInt16( bytes, 0 );
double required_value = -1 + value2 * 6.103515625e-5;
```

Wednesday, February 27, 2019 12:09 PM
• Thank you this appears to have worked to an extent.

How do I round required_value to 1 decimal place?

Also

How I combine 4 bytes to output in the same way as value1?

Thank You again this was a great help.

Wednesday, February 27, 2019 12:36 PM
• Hi BinaryWiggles,

Thank you for posting here.

For your new question, you want to round required_value to 1 decimal place and combine 4 bytes to output in the same way as value1.

You could try the following code.

```            double required_value = -1 + value2 * 6.103515625e-5;
string m = required_value.ToString("#0.0");   //round required_value to 1 decimal place
byte[] by = { byte0, byte1, byte4, byte5 };
int value3 = BitConverter.ToInt16(by, 0);   //combine 4 bytes to output
Console.WriteLine(m);
Console.WriteLine(value3);
```

Result:

Hope my solution could be helpful.

Best regards,

Jack

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Thursday, February 28, 2019 5:10 AM