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Q: function pass in struct pointer, come back with data filled

ningji
Novice

Jul 26, 2013, 8:31 PM

Post #1 of 3 (1224 views)

Q: function pass in struct pointer, come back with data filled	Can't Post

in c code i can do this
func(struct aaa *)
{
aaa->f1 = 1;
aaa->f2 = "abc";
}

how to do this in perl pls ?

Laurent_R
Veteran / Moderator

Jul 27, 2013, 5:07 AM

Post #2 of 3 (1216 views)

Re: [ningji] Q: function pass in struct pointer, come back with data filled [In reply to]	Can't Post

Hi, not sure I understand what you want, but it seems that you want to assign a structure within a function.

You could use a hash and pass a reference to the hash to your function. Something like this:

Code

my %aaa; 
fill_hash(\%aaa); 
print $aaa{'f1'}; # prints 1 
# ... 
 
sub fill_hash { 
     my $aaa_hash_ref = shift; 
     $$aaa_hash_ref{'f1'} = 1; # if you prefer, it could also be: $aaa_hash_ref->{'f1'} = 1 
     $$aaa_hash_ref{'f2'} = 'abc'; 
}

BillKSmith
Veteran

Jul 27, 2013, 8:08 AM

Post #3 of 3 (1209 views)

Re: [ningji] Q: function pass in struct pointer, come back with data filled [In reply to]	Can't Post

It is not possible to do exactly what you are asking because perl's concept of type is much different from C's. Perl's hash is similar to C's struct, but not at all the same. Perl's hash keys are very similar to C's structure members. Perl's reference is similar to C's pointer, but again, not the same. Perl's function prototypes appear to be similar to C's, but they are not! (In fact, they are almost never needed or appropriate.)

Laurent's answer is probably the best perl solution to the same type of problem that your c function would be used for.
Good Luck,
Bill

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