Microsoft KB Archive/216480

= PRB: Setting the Optional Byte Argument Default Value to TRUE Breaks Binary Compatibility =

Article ID: 216480

Article Last Modified on 5/12/2003

-

APPLIES TO


 * Microsoft Visual Basic 5.0 Learning Edition
 * Microsoft Visual Basic 6.0 Learning Edition
 * Microsoft Visual Basic 5.0 Professional Edition
 * Microsoft Visual Basic 6.0 Professional Edition
 * Microsoft Visual Basic 5.0 Enterprise Edition
 * Microsoft Visual Basic 6.0 Enterprise Edition

-



This article was previously published under Q216480



SYMPTOMS
Setting the default value of an Optional Byte argument to TRUE causes the following error when the project is compiled with Binary Compatibility:

in the class module has arguments and/or a return type that is incompatible with a similar declaration in the version-compatible component



RESOLUTION
Use 255 instead of TRUE for the default value.



Steps to Reproduce Behavior
 Create a new ActiveX DLL project.  Insert the following code into Class1: Option Explicit

Public Function meth1(pf1 As String, Optional pf2 As Byte = True) As Boolean ' Sample method End Function  From the File menu, select Make Project1.DLL. From the Project menu, select Project1 Properties. Click on the Component tab. Set the Version Compatibility to Binary Compatibility.</li> Verify that Project1.dll is listed in the File Location box at the bottom of the form.</li> Close the Project Properties dialog box.</li> Select Make Project1.dll from the File menu. Change the path to the DLL so that it is in a different location than the originally-compiled version of project1.dll and click OK. The error occurs at this point.</li></ol>

<div class="references_section">