Hi,

has anyone managed to build in a pascal program what in C is a

char *strings[]

and use it from C?

In pascal terms this is a single dimensional array aka vector of PChar.

Do I have to make copies of any string or is it sufficient to fill up an array with PChar?

My attemtps all failed up to know ...

TIA,
Marc

Same as char**strings so ppchar.

In pascal terms this is a single dimensional array aka vector of PChar. Do I have to make copies of any string or is it sufficient to fill up an array with PChar?

That depends on what you do with it, like under C, where you can also let it point to e.g. constants using &

My attemtps all failed up to know ...

Have a look at the unixutil unit (most notably stringtoppchar) and the unix unit implementation (exec procedures that use environment mostly)

Note that the unixutil unit was meant only as a temporary helper for unix, and not really meant to be used by endusers. The "leftovers" of the linux->unix unit transform are stored there.

That completely depends on what the Pascal and C programs do with those pchars afterwards. In general, there's no difference in passing an array of pchars to a C function compared to passing them to a Pascal procedure: just make sure they are not freed before their last use. Only if the C program may free them later, you have to allocate them using malloc/free (although that's unlikely to be the case).

Jonas

The missing link. :)

But at least it is a nice source of information for learning how to handle some cases.

Thanks,
Marc