Microsoft KB Archive/172312

Knowledge Base

PRB: WithEvents Does Not Work with Remote Automation

Article ID: 172312

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 Q172312

SYMPTOMS

When attempting to raise a remote event across Remote Automation, the following run-time error appears:

-2147467259(80004005) , Automation error

CAUSE

Remote Automation does not currently support the use of WithEvents.

RESOLUTION

To support remote events with Visual Basic 5.0, use DCOM instead of Remote Automation. You can also use callbacks to simulate raising events remotely.

STATUS

This behavior is by design.

MORE INFORMATION

Steps to Reproduce Behavior

Use the following steps on the server machine:

1. Start Visual Basic 5.0 and create a new ActiveX EXE project.
2. From the Project menu, selectProject properties and change the Project name to "Projtest."
3. Add a Class Module and change its name to "Testclass."

4. In Testclass' Code window, input following code:

         Public Event propchange(newv As String)
         Private propt As String
   
         Public Sub showfrm()
               MsgBox "asdfl"
   
         End Sub
   
         Public Property Get testp() As String
               testp = propt
         End Property
   
         Public Property Let testp(ByVal vNewValue As String)
               propt = vNewValue
               RaiseEvent propchange(propt)
         End Property
   
                           

5. On the File menu, click "Make ProjTest.exe."
6. Copy the corresponding .exe, .tlb, and .vbr files to the client machine.
7. Start the Automation Manager and the RemAuto Connection Manager to set necessary server-side configuration for using Projtest.testclass for Remote Automation.

Use the following steps on the client machine:

1. Run Projtest.exe, which was copied from the Server side in the above steps.
2. Start the RemAuto Connection Manager to set necessary Client-side configuration for using Projtest.testclass.
3. Launch Visual Basic 5.0 and create a new Standard EXE project with a standard form.
4. From the Project menu, click References and select the "Projtest" box.

5. In Form1's Code window, input following code:

         Public WithEvents eventp As testclass
   
         Private Sub eventp_propchange(newv As String)
              MsgBox newv
         End Sub
   
         Private Sub Form_Load()
              Dim a As New testclass
              a.showfrm
              Set eventp = a
              a.testp = "test string"
          End Sub
   
                           

6. Run the project and check if the Remote Automation connection is correct, the message box should pop up on the server-side machine.
7. Click OK to close the message box on the server-side machine.

Result

When the line "Set eventp = a" executes, you will get the following run- time error:

-2147467259(80004005) , Automation error

Expected behavior

A message box should appear on the client-side machine because the server raised the Propchange event.

NOTE: If both the client and the server are running on the same machine (with local automation), you will see the expected behavior.

Keywords: kbprb KB172312

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