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Q39577: DRAW "Illegal Function Call" In .EXE Compiled with BC /D

Article: Q39577
Product(s): See article
Version(s): 4.00 4.00b 4.50
Operating System(s): MS-DOS
Keyword(s): ENDUSER | buglist4.00 buglist4.00b buglist4.50 B_BasicCom ptm226 | mspl13_basic
Last Modified: 10-APR-1989

The program example below will draw a large number 1 on the screen.
This program works correctly under QB.EXE and as a .EXE program when
compiled WITHOUT the debug option.

The program causes an "Illegal function call" at run time if compiled
using the debug option (BC /D). The program can be modified to work
correctly by using a single variable-length string instead of an
element of a variable-length string array, i.e., B$ instead of A$(x)
and by not using the VARPTR$ FUNCTION.  The following two statements
will execute identically:

                          DRAW "X" + VARPTR$(A$(1))
                          DRAW A$(1)

Microsoft has confirmed this to be a problem in QuickBASIC Versions
4.00, 4.00b, and 4.50 and in the BASIC Compiler Versions 6.00 and
6.00b (buglist6.00, buglist6.00b) for MS-DOS and OS/2. The program
works correctly in QuickBASIC Version 3.00. We are researching this
problem and will post new information as it becomes available.

The following is a code example:

DIM a$(65)
a$(17) = "BU6BR2NG1D6L1R2BR4"
SCREEN 1
DRAW "BM52,52;s24;c1"
DRAW "x" + VARPTR$(a$(17))
INPUT x$
END

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