"Overflow" Error Using QLBDUMP.BAS with Large Quick Library (27496)
The information in this article applies to:
- Microsoft QuickBASIC 4.0, when used with:
- the operating system: MS-DOS
- Microsoft QuickBASIC 4.0b, when used with:
- the operating system: MS-DOS
- Microsoft QuickBASIC 4.5, when used with:
- the operating system: MS-DOS
This article was previously published under Q27496 SYMPTOMS
When running the program QLBDUMP.BAS, large Quick libraries can cause
an "Overflow" error. The error occurs in the following line:
QHdrPos = (EHdr.CParHdr + EHdr.CS) * 16 + EHdr.IP + 1
This error can be corrected by making the 16 into a long-integer
constant. To do this, change the line to read as follows:
QHdrPos = (EHdr.CParHdr + EHdr.CS) * 16& + EHdr.IP + 1
Alternatively, you can invoke the CLNG function as follows:
QHdrPos = CLNG(EHdr.CParHdr + EHdr.CS) * 16 + EHdr.IP + 1
STATUS
Microsoft has confirmed this to be a bug in the QLBDUMP.BAS
program example provided in QuickBasic Versions 4.00, 4.00b, and 4.50,
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
Microsoft Basic Professional Development System (PDS) Version 7.00 for
MS-DOS and MS OS/2 (fixlist7.00).
MORE INFORMATION
The problem occurs because the calculations on the right-hand side of
the equation are being done in normal-integer math, even though the
result is to be stored in a long-integer variable. Making the 16 a
long integer forces the right-hand side of the equation to do its math
in long-integer format.
The QLBDUMP program lets you display the routines that are stored in a
.QLB Quick library. The QB.EXE editor uses Quick libraries for calling
external routines. Quick libraries (.QLB files) have no other purpose.
| Modification Type: | Minor | Last Reviewed: | 1/8/2003 |
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| Keywords: | KB27496 |
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