Exporting a String

Marcin 'Qrczak' Kowalczyk qrczak@knm.org.pl
28 Sep 2001 10:30:13 GMT

Fri, 28 Sep 2001 08:20:08 +0200, Sven Eric Panitz <sep@softwareag.com> pisze:

>     xs <- peekCString cxs
>     ys <- peekCString cys
>     erg <- return (xs++ys)

The last line can be written:
      let erg = xs++ys
and you can also directly write (xs++ys) instead of erg below.

>     newCString erg

All OK, except that you leak memory. This string is allocated using
malloc and should be freed using free when no longer needed (either
C free or Haskell free).

>    //calling Haskell function
>    test=cAppend("the world"," is my oyster"); 
>    //printing its result
>    printf("%s\n", test);

And then: free(test);

BTW, there is less boilerplate (no startupHaskell etc.) when the main
program is in Haskell instead of C (of course sometimes this is not
what we want).

 __("<  Marcin Kowalczyk * qrczak@knm.org.pl http://qrczak.ids.net.pl/
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