Passing NULL to a c function
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Hi All.
I have a problem with the following wrapper function for Morfit for EU
global function Morfit_engine_load_world( sequence world_file_name, =
sequence world_directory_path, sequence bitmaps_directory_path, atom =
world_mode)
-- int Morfit_engine_load_world(char *world_file_name, char =
*world_directory_path, char *bitmaps_directory_path, =20
-- int =
world_mode)
return =
allocate_string(world_directory_path),
allocate_string(bitmaps_directory_path),
world_mode})
end function
The above function can be called something like this (and works fine) :-
funcval =3D =
SER_DEFINED_BEHAVIOR)
The problem I have is that I need to call it like this :-
Morfit_engine_load_world(NULL,NULL,NULL, EDITOR_MODE); <-- the way you =
could call it in C=20
My question is how can I pass the "NULL" pointers using the wrapper. Am =
I going to have to do a test and have a function call with the =
allocate_string stuff and then another function call for the NULL's?? =
(perhaps test the sequences for an empty sequence or something?). Or is =
there a "NULL" character I can pass.....??=20
This is beyond my C knowledge. Any ideas would be greatly appreciated.
Mark Brown
mabrown at senet.com.au
=20
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<DIV><FONT size=3D2>Hi All.</FONT></DIV>
<DIV> </DIV>
<DIV><FONT size=3D2>I have a problem with the following wrapper function =
for=20
Morfit for EU</FONT></DIV>
<DIV> </DIV>
<DIV> </DIV>
<DIV><FONT size=3D2>global function Morfit_engine_load_world( sequence=20
world_file_name, sequence world_directory_path, sequence =
bitmaps_directory_path,=20
atom world_mode)<BR> -- int =
Morfit_engine_load_world(char=20
*world_file_name, char *world_directory_path, char=20
*bitmaps_directory_path, </FONT></DIV>
<DIV><FONT size=3D2> =20
bsp; =20
int world_mode)<BR> return=20
bsp; =20
=20
world_mode})<BR>end function</FONT></DIV>
<DIV> </DIV>
<DIV> </DIV>
<DIV><FONT size=3D2>The above function can be called something like this =
(and=20
works fine) :-</FONT></DIV>
<DIV> </DIV>
<DIV><FONT size=3D2> funcval =3D=20
SER_DEFINED_BEHAVIOR)</FONT></DIV>
<DIV> </DIV>
<DIV> </DIV>
<DIV><FONT size=3D2>The problem I have is that I need to call it like =
this=20
:-</FONT></DIV>
<DIV> </DIV>
<DIV><FONT size=3D2>Morfit_engine_load_world(NULL,NULL,NULL, =
EDITOR_MODE); =20
<-- the way you could call it in C </FONT></DIV>
<DIV> </DIV>
<DIV><FONT size=3D2>My question is how can I pass the "NULL" pointers =
using the=20
wrapper. Am I going to have to do a test and have a function call with =
the=20
allocate_string stuff and then another function call for the NULL's?? =
(perhaps=20
test the sequences for an empty sequence or something?). Or is there a =
"NULL"=20
character I can pass.....?? </FONT></DIV>
<DIV><FONT size=3D2></FONT> </DIV>
<DIV><FONT size=3D2>This is beyond my C knowledge. Any ideas would be =
greatly=20
appreciated.</FONT></DIV>
<DIV> </DIV>
<DIV><FONT size=3D2>Mark Brown</FONT></DIV>
<DIV> </DIV>
<DIV><FONT size=3D2><A=20
>
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