DOCUMENT:Q67792 31-OCT-1999 [utilities] TITLE :FIX: PWB Extensions in MS-DOS Cannot Shell to MS-DOS PRODUCT :Microsoft Programming Utilities PROD/VER:MS-DOS:1.0,1.1 OPER/SYS: KEYWORDS:kb16bitonly ====================================================================== ------------------------------------------------------------------------------- The information in this article applies to: - Microsoft Programmer's Workbench for MS-DOS, versions 1.0, 1.1 ------------------------------------------------------------------------------- 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. Additional query words: 1.00 1.10 buglist1.00 buglist1.10 fixlist2.00 ====================================================================== Keywords : kb16bitonly Technology : kbAudDeveloper kbPWBSearch kbZNotKeyword3 kbPWB100DOS kbPWB110DOS Version : MS-DOS:1.0,1.1 Solution Type : kbfix ============================================================================= THE INFORMATION PROVIDED IN THE MICROSOFT KNOWLEDGE BASE IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. MICROSOFT DISCLAIMS ALL WARRANTIES, EITHER EXPRESS OR IMPLIED, INCLUDING THE WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT SHALL MICROSOFT CORPORATION OR ITS SUPPLIERS BE LIABLE FOR ANY DAMAGES WHATSOEVER INCLUDING DIRECT, INDIRECT, INCIDENTAL, CONSEQUENTIAL, LOSS OF BUSINESS PROFITS OR SPECIAL DAMAGES, EVEN IF MICROSOFT CORPORATION OR ITS SUPPLIERS HAVE BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. SOME STATES DO NOT ALLOW THE EXCLUSION OR LIMITATION OF LIABILITY FOR CONSEQUENTIAL OR INCIDENTAL DAMAGES SO THE FOREGOING LIMITATION MAY NOT APPLY. Copyright Microsoft Corporation 1999.