This is a repost from an improperly worded email.
That previous email thread divulged into things it shouldn't have to which
I'm partially to blame.
This isn't Windows specific - the problem occurs across platforms.
This is simply about the proper way to define an *inline* array of items in
a Raku CStruct definition. It's also about the retrieval of those stored
values.
The type of items aren't relevant. char[n], int[n], int16[n], etc ... it
doesn't matter one bit.
Given the following C structure:
typedef struct T {
> char a[260];
> int32_t b;
> } T;
>
and given the following C function body:
void setTest(T *t){
> (void)memset(t->a, 'T', 260);
> t->b = 1;
> }
>
I presumed this would be defined as follows in Raku[1]:
class T is repr('CStruct') {
> HAS int8 @.a[260] is CArray;
> has int32 $.b;
> };
>
> sub setTest(T) is native('./test.so') { * };
>
and invoked as such:
my T $t .= new;
> setTest($t);
>
While the value of the member 'b' gets set to 1 as expected, I cannot
inspect the values that should be stored at the memory location referenced
by member 'a[0]..a[n]'.
Conversely, the following C program snippet that utilizes the same C
function provides the output one would expect:
extern void setTest(T *);
>
> T t;
>
> int main(void)
> {
> setTest(&t);
> printf("%c\n%d\n", t.a[0], t.b);
> _exit(0);
> }
>
So the questions are:
1) How does one define an *inline* array of whatever size in Raku (size
doesn't matter)
2) How does one retrieve the values stored in that defined array after the
callee populates it.
Thanks,
~Paul
[1] - test.so is the shared object that I created for testing.
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