FIX: PWB Extensions in MS-DOS Cannot Shell to MS-DOS (67792)
The information in this article applies to:
- Microsoft Programmer's Workbench for MS-DOS 1.0
- Microsoft Programmer's Workbench for MS-DOS 1.1
This article was previously published under Q67792 SYMPTOMS
Extensions written for the Programmer's WorkBench (PWB) versions 1.0
and 1.1 that require a call to the operating system do not work
correctly under DOS. One example of this is the FILTER.C sample
extension packaged with Microsoft C version 6.0.
CAUSE
When PWB.COM is executed under DOS, it spawns the main editor
(PWBED.EXE). PWBED.EXE is cleared from memory when a DOS shell is run
from within the editor. Once the shell has completed, PWBED.EXE is
reloaded from disk and initialized. The initialization is what causes
the problem because it also initializes any extensions to the editor
at the same time. This means that any information that the extension
was keeping track of is lost.
STATUS
Microsoft has confirmed this to be a problem in PWB versions 1.0 and
1.1. This problem was corrected in PWV version 2.0.
| Modification Type: | Major | Last Reviewed: | 9/30/2003 |
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| Keywords: | kb16bitonly kbfix KB67792 |
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