Microsoft KB Archive/47565

From BetaArchive Wiki
Knowledge Base

Article ID: 47565

Article Last Modified on 11/21/2006

This article was previously published under Q47565


When running a program from the QuickBasic QB.EXE environment Version 4.50, 4.00b, or 4.00, a "string space corrupt" error message can occur, dumping you back to DOS, when all of the following conditions occur together:

  1. The program contains a named COMMON block with the name of /SYMBOL/.
  2. The named COMMON block contains a variable-length STRING.
  3. Any Quick library has been loaded.


Microsoft has confirmed this to be a bug in QuickBasic Versions 4.00, 4.00b, and 4.50. We are researching this problem and will post new information here in the Microsoft Knowledge Base as it becomes available.

This problem does not occur in the Microsoft Basic Professional Development System (PDS) Version 7.00 QBX.EXE environment.


This problem can be corrected by any of the following methods:

  1. Rename the COMMON block to anything but /SYMBOL/.
  2. Remove all variable-length STRINGs from the COMMON block.
  3. Changed the variable-length STRINGs to fixed-length STRINGs.
  4. Invoke QuickBasic without loading a Quick library.

Code Example

The following sample program generates a "String space corrupt" error message and then drops you out to DOS if run from within the environment with a Quick library loaded:

   COMMON /SYMBOL/ Astring$
   Print "Hello"

Additional query words: QuickBas BasicCom buglist4.00 buglist4.00b buglist4.50

Keywords: KB47565