Q27906: CALLing Pascal and FORTRAN Modules in QuickBASIC Programs

Article: Q27906
Product(s): See article
Version(s): 6.00 6.00b 7.00 | 6.00 6.00b 7.00
Operating System(s): MS-DOS | OS/2
Keyword(s): ENDUSER | B_QuickBas | mspl13_basic
Last Modified: 2-FEB-1990

The following information is from the README.DOC disk file for
Microsoft BASIC Compiler Version 6.00 for MS-DOS and OS/2. This
information also applies to BASIC compiler 6.00b, to Microsoft BASIC
Professional Development System (PDS) Version 7.00, and to QuickBASIC
Versions 4.00, 4.00b, and 4.50 for MS-DOS (and is also found in the
README.DOC disk file for all these products except BASIC PDS 7.00).

Modules compiled with Microsoft Pascal or FORTRAN can be linked with
compiled BASIC programs, as described in the "Microsoft Mixed-Language
Programming Guide" (which comes with Microsoft Macro Assembler
Versions 5.00 and 5.10 or Microsoft C Versions 5.00 and 5.10). These
modules can also be incorporated in Quick libraries for use in the
QuickBASIC QB.EXE or BASIC PDS 7.00 QBX.EXE environments. However,
BASIC programs containing code compiled with Microsoft Pascal must
allocate at least 2K of near-heap space for Pascal. This can be done
using the DIM statement to allocate a static array of 2K or greater in
the NMALLOC named common block, as shown in the following example:

   DIM name%(2048)
   COMMON SHARED /NMALLOC/ name%()

The Pascal run time assumes it always has at least 2K of near-heap
space available. If the Pascal code cannot allocate the required
space, BASIC may hang. This applies to Pascal code in Quick libraries
as well as to Pascal code linked into executable files. The situation
is similar for FORTRAN I/O, which also requires near buffer space, and
which can be provided by the same means as the Pascal near malloc
space.

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