PRB: "Invalid Property Value" When You Query MDIChild Property
ID: Q190220
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The information in this article applies to:
-
Microsoft Visual Basic Learning, Professional, and Enterprise Editions for Windows, versions 5.0, 6.0
SYMPTOMS
In Visual Basic, if you query for the MDIChild property of an MDI Parent
form, the following error occurs:
Error 380 : Invalid Property Value
CAUSE
MDI Parent forms do not have an MDIChild property. To query for this
nonexistent property will result in the above error.
RESOLUTION
To resolve this, use the following code to query for the MDIChild property
of a form:
Sample Code
Dim f As Form
For Each f In Forms
If Not TypeOf f Is MDIForm Then
If f.MDIChild Then
Form1.Print f.Name & " MDI Child"
Else
Form1.Print f.Name & " Not MDI Child"
End If
Else
Form1.Print f.Name & " Not MDI Child"
End If
Next
STATUS
This behavior is by design.
MORE INFORMATION
Steps to Reproduce Behavior
- Create a new Standard EXE project in Visual Basic.
- Add an MDI form to the project by selecting Add MDI Form from the
Project menu.
- Set the MDIChild property of Form1 to True.
- Paste the following code in the General Declarations section of Form1:
Private Sub Form_Click()
Dim f As Form
For Each f In Forms
If f.MDIChild Then
Form1.Print f.Name & " MDI Child"
Else
Form1.Print f.Name & " Not MDI Child"
End If
Next
End Sub
- Press F5 to run the project
- Click on Form1.
An error message displays "Run-Time Error 380 : Invalid Property Value"
instead of printing all of the names of the forms, and a value indicating
whether or not they are an MDI Child form
Additional query words:
Keywords : kbcode kberrmsg kbnokeyword kbVBp500 kbVBp600 kbGrpVB
Version : WINDOWS:5.0
Platform : WINDOWS
Issue type : kbprb