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Q28050: QuickBASIC Hangs Using User-Defined Record Greater Than 64K

Article: Q28050
Product(s): See article
Version(s): 4.00 4.00b
Operating System(s): MS-DOS
Keyword(s): ENDUSER | B_BasicCom buglist4.00 buglist4.00b fixlist4.50 | mspl13_basic
Last Modified: 22-JAN-1990

QuickBASIC fails to trap a user-defined record type that exceeds 64K
in size. It is not legal for a user-defined record to exceed 64K in
size.

The example program below will cause the system to hang.

Microsoft has confirmed this to be a problem in QuickBASIC Versions
4.00 and 4.00b, and in Microsoft BASIC Compiler Versions 6.00 and
6.00b for MS-DOS and MS OS/2 (buglist6.00, buglist6.00b). This problem
was corrected in QuickBASIC Version 4.50 and in Microsoft BASIC
Professional Development System (PDS) Version 7.00 for MS-DOS and MS
OS/2 (fixlist7.00).

The following is a code example:

type foo
   a as string*32500
   b as string*32500
   c as string *1000
end type
dim x as foo
x.c=" "
print x.c
end

Note: Dynamic arrays of user-defined records may exceed 64K in size
provided that each record is less than 64K in size. When using an
array larger than 64K (which requires the /AH option), it is also
advisable to make the record-array element size a multiple (of any
power of 2) that terminates exactly on 64K boundaries.

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