On 2019-12-31 09:17, JJ Merelo wrote:
Hi,
El mar., 31 dic. 2019 a las 5:54, Todd Chester via perl6-users
(<perl6-us...@perl.org <mailto:perl6-us...@perl.org>>) escribió:
Hi All,
https://docs.raku.org/language/nativecall.html#Passing_and_returning_values
Did anyone else discover the mistake, hopefully not the hard way like I
did. Anyone get weird gibberish printed out like I did?
my$string="FOO";
# The lifetime of this variable must be equal to the required lifetime
of
# the data passed to the C function.
my$array=CArray[uint8].new($string.encode.list);v
The mistake is that "C" strings are terminated by a chr(0) -- in
"C" terms chr(0) is called a nul or 0x00.
If you don't terminate your C string, the reading functions keep
careening
until it finds a chr(0). You have to tack a chr(0) onto the end.
my$array=CArray[uint8].new($string.encode.list);
$array [$array.elems] = 0;
$array should be 70 79 70 0 not 70 79 79
You can test this with `say "$array"` (include the quotes).
Maybe JJ will pick up on this and get it fixed.
I don't always read this list, but I do read issues. If you put it
there, it will be definitely get addressed when possible.
--
JJ
Hi JJ,
I have a rule about not posting to that list, so maybe
you or someone else will pick it up.
-T
