Re: Win32::API and pointer of dword

I think the following would do:

my $CheckLen = Win32::API->new('...', 'CheckLen', 'P', 'V')
    or die ...;

sub CheckLen {
    $len = pack('L', $_[0]);
    $CheckLen->Call($len);
    $_[0] = unpack('L', $len);
}
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Of course, you could also try the prototype method of loading your function.

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Re^2: Win32::API and pointer of dword by cbrauner (Novice) on Aug 18, 2009 at 14:44 UTC
yea i tried this wiwth pack/unpack the only issue i have is with initialisation of len=0 : in my c function i have a check: if len==0 return ERROR, but this doesnt get called ..? thx GrandFather restored original content	[reply]
Re^2: Win32::API and pointer of dword by cbrauner (Novice) on Aug 18, 2009 at 14:45 UTC
yea i tried this with pack/unpack the only issue i have is with initialisation of len=0 : in my c function i have a check: if len==0 return ERROR, but this doesnt get called ..? thx GrandFather restored original content	[reply]
Re^3: Win32::API and pointer of dword by ikegami (Patriarch) on Aug 18, 2009 at 15:14 UTC
`len` is will never be `NULL` pointer. It'll never be zero. If you want the ability to pass `NULL`, we'll have to do more work. Which of the following is true? Did you mean to allow `NULL` to be passed? Did you forget to dereference `len`? Was choosing to pass a pointer a mistake? And then there's `return ERROR;` in a function of return type `void`...	[reply] [d/l] [select]
Re^4: Win32::API and pointer of dword by cbrauner (Novice) on Aug 18, 2009 at 15:31 UTC
found it in c-code : check is against pointer and not against the value - third party dll ;) - thx	[reply]
Re^5: Win32::API and pointer of dword by ikegami (Patriarch) on Aug 18, 2009 at 16:30 UTC
Re^3: Win32::API and pointer of dword by Anonymous Monk on Aug 18, 2009 at 14:56 UTC
Show your code, not a description	[reply]