PRB: Instantiating a Project-Compatible Server Causes Error 430
ID: Q190131
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The information in this article applies to:
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Microsoft Visual Basic Learning, Professional, and Enterprise Editions for Windows, version 6.0
SYMPTOMS
Instantiating a class within a server that has been previously compiled but
is now running within the Visual Basic IDE, causes run-time error 430.
CAUSE
When a Visual Basic project is compiled with Project Compatibility, the
CLSID remains the same while the IID changes for subsequent builds.
Therefore, attempting to create the specific class in the "compatible"
server generates the following error because the specific IID has changed
and no longer exists:
Run-time error '430':
Class does not support Automation or does not support expected interface
RESOLUTION
Use Binary Compatibility.
STATUS
This behavior is by design.
MORE INFORMATION
Steps to Reproduce Behavior
- Start a new ActiveX DLL project in Visual Basic. Class1 is created by
default.
- From the Project menu, select Project Properties, and then change the
Project Name to SPP2.
- From the File menu, select Make SPP2.DLL.
- Add the following code to the code module of Class1:
Private Sub Class_Initialize()
Debug.Print "Initialize"
End Sub
- Start a second instance of Visual Basic and create a new Standard EXE
project. Form1 is created by default.
- Select References from the Project menu, and add a reference to
SPP2.dll.
- In Form1, place the following code:
Private Sub Form_Load()
Dim x As SPP2.Class1
Set x = New Class1
End Sub
- Switch back to the first instance of Visual Basic and run SPP2.
- Switch back to the second instance of Visual Basic and press the F8 key
to step into the code.
- Continue to press the F8 key until the Error 430 DialogBox pops up.
Additional query words:
kbDSupport kbAppSetup kbVBp600 kbdss
kbVBp kbIDE kbActiveX
Keywords : kbGrpVB
Version : WINDOWS:6.0
Platform : WINDOWS
Issue type : kbprb