FIX: Public Type Statement Causes Application Error

• Microsoft Visual Basic Learning, Professional, and Enterprise Editions for Windows, version 6.0

SYMPTOMS

An ActiveX control project with a public user-defined variable and event is created. When the ActiveX control is placed in a Standard EXE project and then run from the IDE, the event executes properly. When the Standard EXE project is run using the compiled ActiveX control, attempting to execute the event in the ActiveX control generates the following error message:

Run-time Error '-2147417848(80010108)':
Method 'ReDimUDT' of object 'UserControl1' failed

RESOLUTION

To prevent this behavior, declare variables of a user-defined type in ActiveX controls as Private variables.

STATUS

Microsoft has confirmed this to be a bug in the Microsoft products listed at the beginning of this article.

This bug was corrected in Visual Studio 6.0 Service Pack 3.

For more information about Visual Studio 6.0 Service Packs, please see the following articles in the Microsoft Knowledge Base:


Q194022 INFO: Visual Studio 6.0 Service Packs, What, Where, Why

Q194295 HOWTO: Tell That Visual Studio 6.0 Service Packs Are Installed

MORE INFORMATION

This section illustrates how to create a sample project that demonstrates this bug behavior. It assumes you are familiar with creating ActiveX controls, adding ActiveX controls to a Standard EXE project, and compiling a project.

Steps to Reproduce Behavior

1. Start a new Visual Basic 6.0 ActiveX Control project. UserControl1 is created by default.



2. Add the following code to the General Declarations section of UserControl1:




Option Explicit

Public Type MyNewType
   MyNewType As String
End Type

Private udtMyType() As MyNewType

Public Sub ReDimUDT()
   ReDim Preserve udtMyType(0)
   MsgBox "ReDIM UDT Event Executed."
End Sub 

3. On the File Menu, click Make Project1.ocx to create a compiled control.



4. Save your project files for future reference.

1. Create a new Standard EXE project. Form1 is created by default.



2. On the Project menu, click Components. Check the entry for the Project1 OCX and click OK.



3. Add a CommandButton and a UserControl1 to Form1.



4. Copy the following code to the General Declarations section of Form1:




Option Explicit

Private Sub Command1_Click()
   UserControl11.ReDimUDT
End Sub 

5. Run the program and click the CommandButton. The error message given earlier is generated.

REFERENCES

Creating ActiveX Components in the Online Help.

The Microsoft Visual Basic 6.0 Component Tools Guide, or the MSDN Web site below explains how to create ActiveX components:

http://msdn.microsoft.com/library/devprods/vs6/vb/html/vbconcreatingolecomponents.htm

Additional query words:

Keywords : kbservicepack kbVBp600bug kbVS600sp2 kbVS600SP1 kbVS600sp3fix
Version : WINDOWS:6.0
Platform : WINDOWS
Issue type : kbbug