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Postings from November 2022
>> On Sun, Nov 20, 2022 at 3:48 AM ToddAndMargo via perl6-users >> <perl6-users@perl.org <mailto:perl6-users@perl.org>> wrote: >> >> Hi All, >> >> In one of my native call, I get returned a >> pointer to a DWORD (uint32). >> >> How do I turn that into the actual value >> in the DWORD? >> >> Many thanks, >> -T On 11/20/22 16:00, Clifton Wood wrote: > @ToddAndMargo, > > Two ways: > > - Use "my CArray[uint32] $p", use $p as your parameter, and access the > value as "$p[0]" > > or > > - Use "my Pointer[uint32] $p" and use "$p.deref" > > My personal preference is the former, as it is the best way to access > AND set the actual former value. The latter can only deref. To my > knowledge, you cannot set the referenced value of a Pointer type. I do > reserve the right to be wrong on this, though. Hi Clifton, I have a pointer $p (from a Windows API call) that points to a spot in memory that is 24 bytes long. # Where do I tell it I want 24 bytes back? my $ca = CArray[uint8].new( 0xFF ** 24 ) $ca = $p.deref; Internal error: unhandled target type Yours in confusion, -TThread Previous | Thread Next