That does help some Daniel.
I do in fact need to work with C style null terminated strings because when
passing a structure to an underlying OS via nativecall, you have no control
over what the underlying libraries want.
An Example:
class myStruct is repr('CStruct')
{
HAS int8 @.Path[MAX_PATH] is CArray;
method path
{
blob-from-pointer(Pointer.new(nativecast(Pointer, self)+4),
:elems(MAX_PATH));
}
}
sub Fill(myStruct) is native('Kernel32') { * };
my myStruct $struct .= new;
Fill($struct);
say $struct.path;
As you can imagine, @.PATH has a static buffer that is MAX_PATH
length, and the strings stored there are <= MAX_PATH in length.
The only way to get them is to look for that NULL.
On Wed, Jun 9, 2021 at 10:46 AM Daniel Sockwell <[email protected]>
wrote:
> Hi Paul,
>
> If you _do_ want/need to work with C-style null-terminated strings, you
> can use the (core)
> NativeCall library. So, given your example:
>
> > my Buf $b .= new([72, 105, 0, 32, 97, 103, 97, 105, 110, 0]);
> > say $b.decode;
> > I would expect this to print 'Hi'.
> >
> > Instead it prints 'Hi again'.
>
> You can write:
>
> use NativeCall;
> say nativecast(str, $b) # prints 'Hi'
>
> Hope that helps!
>
> – codesections
>
--
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