Android Question Int() to Byte()?

stu14t · May 23, 2022

Looking for some guidance on How to convert an array of integers to array of bytes?

Many thanks

stu14t · May 23, 2022

OliverA said:
Of course, since each Int is 4 bytes and 16 Int(s) make 64 bytes.

Try

B4X:

Code = Regex.Split(",",Dline) Dim asInt as Int Dim asBytes(16) As Byte For n = 0 To 15 If IsNumber (Code(n)) Then asInt = Code(n) 'Converts Chr$ to Int asBytes(n) = Bit.And(asInt, 0xFF) End If Next iv3 = asBytes

This should create a 16 byte Byte array. Note, the code can be cleaned up a bit more, I just did not want to mess with the existing iv3 declaration (you may not need asBytes). Also, I just typed this in here, you may need to fix some errors

That's done it, Many thanks. Just had to change the for next loop to 0 to 15 but otherwise perfect

Jeffrey Cameron · May 23, 2022

See: https://www.b4x.com/android/help/byteconverter.html

stu14t · May 23, 2022

I've had a look at that but I think i'm doing something wrong. I start with a comma separated text string of numbers (234,3,149,74,114,102,1,60,68,163,73,10,190,179,241,21) and then use this code, but It's not working:

B4X:

    Code = Regex.Split(",",Dline)
        
        For n = 0 To 16
            If IsNumber (Code(n)) Then
                Val(n) = Code(n)            'Converts Chr$ to Int
                iv3 = conv.IntsToBytes(Val) 'Coverts Int() to Bytes
            End If
                
        Next

OliverA · May 23, 2022

What are you expecting? What are you getting?

rbghongade · May 23, 2022

Hi,
I think line no 6 should be:

B4X:

iv3(n) = conv.IntsToBytes(Val(n))

OliverA · May 23, 2022

rbghongade said:
Hi,
I think line no 6 should be:

B4X:

iv3(n) = conv.IntsToBytes(Val(n))

Ah, close, I think the integer to byte conversion needs to happen outside of the loop

B4X:

    Code = Regex.Split(",",Dline)
        
        For n = 0 To 16
            If IsNumber (Code(n)) Then
                Val(n) = Code(n)            'Converts Chr$ to Int
                'iv3 = conv.IntsToBytes(Val) 'Coverts Int() to Bytes
            End If
                
        Next
        iv3 = conv.IntsToBytes(Val) 'Coverts Int() to Bytes

Also, the output may be affected by the Endian setting (https://www.b4x.com/android/help/byteconverter.html#byteconverter_littleendian)

stu14t · May 23, 2022

@OliverA Many thanks, I tried the code you suggested but It has created an array that's 64 bytes long instead 16 It looks (a sample) like this:
Not sure why it's padded it out

OliverA · May 23, 2022

stu14t said:
64 bytes long instead 16

Of course, since each Int is 4 bytes and 16 Int(s) make 64 bytes.

Try

B4X:

    Code = Regex.Split(",",Dline)
        Dim asInt as Int
        Dim asBytes(16) As Byte
        For n = 0 To 16
            If IsNumber (Code(n)) Then
                asInt = Code(n)            'Converts Chr$ to Int
                asBytes(n) = Bit.And(asInt, 0xFF)
            End If
        Next
        iv3 = asBytes

This should create a 16 byte Byte array. Note, the code can be cleaned up a bit more, I just did not want to mess with the existing iv3 declaration (you may not need asBytes). Also, I just typed this in here, you may need to fix some errors

stu14t · May 23, 2022

OliverA said:
Of course, since each Int is 4 bytes and 16 Int(s) make 64 bytes.

Try

B4X:

Code = Regex.Split(",",Dline) Dim asInt as Int Dim asBytes(16) As Byte For n = 0 To 15 If IsNumber (Code(n)) Then asInt = Code(n) 'Converts Chr$ to Int asBytes(n) = Bit.And(asInt, 0xFF) End If Next iv3 = asBytes

This should create a 16 byte Byte array. Note, the code can be cleaned up a bit more, I just did not want to mess with the existing iv3 declaration (you may not need asBytes). Also, I just typed this in here, you may need to fix some errors

That's done it, Many thanks. Just had to change the for next loop to 0 to 15 but otherwise perfect

Android Question Int() to Byte()?

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