Re^2: Win32::API and pointer of dword

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

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Comment on Re^2: Win32::API and pointer of dword

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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
So I guess it was the following unstated option: You misunderstood the purpose of the check. It isn't checking if the length is zero. It is checking if the pointer is `NULL`, for that would be a problem. Since we'll never pass `NULL`, the check will always be false, and that's a good thing.	[reply] [d/l] [select]
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]