Microsoft KB Archive/171557

= FIX: Compiling VB5 Applications with Large UDTs May Crash =

Article ID: 171557

Article Last Modified on 10/11/2006

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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 Q171557



SYMPTOMS
Compiling a project in Visual Basic 5.0 or compiling a project in Visual Basic 5.0 converted from Visual Basic 4.0, may cause an error similar to the following:

"The instruction at "0x77f64d07" referenced memory at "0x0013fff8. The memory could not be read.

Click on OK to terminate the application"

Clicking OK terminates Visual Basic 5.0.



CAUSE
Doing Put/Get on large records that contain records, VBA fails when writing out the GetPut descriptor.

A common trait of the UDTs that cause the error is that these UDTs often contain arrays of other UDTs. For example: Type MyType x as integer y as integer End Type

Type MyType2 a as string b(6) as Mytype End Type Other UDTs suspected of causing the error contained 15 or more elements.



RESOLUTION
The only sure workaround is to use smaller records.



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



MORE INFORMATION
The UDT must be very large to cause this problem. However, it is not strictly size but the types of the members as well. The exact record size limit is unknown.

Keywords: kbbug kbfix kbprogramming kbvbp500sp2fix kbvs97sp2fix KB171557

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