"cannot convert from Byte[] to byte[]"?

ivanchaos

ArrayList<Byte> byteList;
...(inserting data into bytelist)...
byte[] data = byteList.toArray(new Byte[c1.byteList.size()]);

So basically I'm manipulating byte data in an array list, because it's easier to add or delete this way, then after manipulating data I tried to convert byte arraylist back to byte array...well that's the point when porcessing gives me the "cannot convert from Byte[] to byte[]" error. Anyone have any idea on this? Please help!

PhiLho

You provide the wrong type to toArray...

Beside, auto-unboxing doesn't work automatically on arrays. I fear you have to loop on the array list manually to fill your array.

PhiLho

ArrayList<Byte> byteList = new ArrayList<Byte>();
byteList.add((byte) 5); // Auto-boxing
byteList.add((byte) 15);
byte[] data = new byte[byteList.size()];
for (int i = 0; i < data.length; i++)
{
  data[i] = byteList.get(i); // Auto-unboxing
}
println(data);

GoToLoop

Most direct inline conversion possible (as you already noticed) is to a Byte[]; which is a byte class wrapper type: :-@

// forum.processing.org/two/discussion/777/cannot-convert-from-byte-to-byte

final ArrayList<Byte> byteList = new ArrayList();

byteList.add((byte) 5.5);
byteList.add((byte) 'a');
byteList.add((byte) -25);

println(byteList);
println();

final Byte[] wrapperByteArray = byteList.toArray( new Byte[byteList.size()] );

println(wrapperByteArray);

exit();

And as PhiLho already demonstrated, to get a real byte[], we gotta copy each element to the other: 8-|

// forum.processing.org/two/discussion/777/cannot-convert-from-byte-to-byte

final ArrayList<Byte> byteList = new ArrayList();

byteList.add((byte) 5.5);
byteList.add((byte) 'a');
byteList.add((byte) -25);

println(byteList);
println();

final byte[] byteArray = new byte[byteList.size()];

int i = 0;
for (byte b: byteList)   byteArray[i++] = b;

println(byteArray);

exit();

ivanchaos

Thanks so much guys!