Microsoft KB Archive/171555

= FIX: More Than One Sub Main May Cause EXE to Crash =

Article ID: 171555

Article Last Modified on 12/10/2003

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APPLIES TO


 * Microsoft Visual Basic 5.0 Control Creation Edition
 * Microsoft Visual Basic 5.0 Learning Edition
 * Microsoft Visual Basic 5.0 Professional Edition
 * Microsoft Visual Basic 5.0 Enterprise Edition

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This article was previously published under Q171555



SYMPTOMS
If a project contains more than one Sub Main in different modules, it may run as expected in the IDE and compile without errors in either native or p- code, but will crash when run as an EXE. Visual Basic 5.0 will generate an application error, such as:

"The instruction at referenced memory at . The memory could not be "written"."



CAUSE
To avoid this problem, either include only one parameter-less Sub Main in the project, or install Visual Studio 97 Service Pack 2 (SP2).



STATUS
Microsoft has confirmed this to be a bug in the Microsoft products listed at the beginning of this article. This bug has been fixed in Visual Studio 97 Service Pack 2.

For more information on the Visual Studio 97 Service Pack 2, please see the following article in the Microsoft Knowledge Base:

170365 INFO: Visual Studio 97 Service Packs - What, Where, and Why

For a list of the Visual Basic 5.0 bugs that were fixed in the Visual Studio 97 Service Pack 2, please see the following article in the Microsoft Knowledge Base:

171554 INFO: Visual Basic 5.0 Fixes in Visual Studio 97 Service Pack 2



Steps to Reproduce Behavior
 Start a new Standard EXE project(Project1) in Visual Basic 5.0. Go to Project | Add Module, and add a .bas module(Module1) to Project1.  Add the following code to Module1: Sub Main End  Click on menu Project | Project1 Properties, select the General tab, and set the Startup object as Sub Main. Click on Project | Add Class Module, and add a class module (Class1) to Project1.  Add the following code to Class1: Sub Main End </li> Make Project1.EXE, using either p-code or native code.</li> Run Project1.EXE. Note that Project1.EXE should crash with an Application Error.</li></ol>

Keywords: kbbug kbfix kbvbp500sp2fix kbvs97sp2fix KB171555

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