Q33046: QB.EXE Editor Deletes File if Saved with Insufficient Memory

Article: Q33046
Product(s): See article
Version(s): 4.00 4.00b
Operating System(s): MS-DOS
Keyword(s): ENDUSER | buglist4.00 buglist4.00b fixlist4.50 B_BasicCom | mspl13_basic
Last Modified: 11-DEC-1989

If you attempt to save the current file in the QuickBASIC editor and
there is no memory available, the file will be deleted.

Microsoft has confirmed this to be a problem in QuickBASIC Versions
4.00 and 4.00b, and the version of QuickBASIC provided with the BASIC
compiler Versions 6.00 and 6.00b (buglist6.00, buglist6.00b) for
MS-DOS and MS OS/2. This problem was corrected in QuickBASIC Version
4.50 and QBX.EXE of the Microsoft BASIC Compiler Version 7.00
(fixlist7.00).

The following steps duplicate the problem:

1. Enter QuickBASIC.

2. Enter the following program:

      x=setmem(0)
      y=setmem(-x)

3. Save the file.

4. Run the program.

5. Try to modify the program; you will receive an out of memory error.

6. Try to save the file; you will receive an out of data space error.

7. Leave QuickBASIC.

8. The file will no longer be present; however, it usually can be
   "unerased" with Norton's Utilities.

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