Microsoft KB Archive/158822

= PRB: ADDOBJECT Gives "A member object...already exists" Error =

Article ID: 158822

Article Last Modified on 12/11/1999

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APPLIES TO


 * Microsoft Visual FoxPro 5.0 Standard Edition

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This article was previously published under Q158822



SYMPTOMS
Adding an object to a container after removing that object, may result in the following error message:

A member object with this name already exists



STATUS
This behavior is by design.



MORE INFORMATION
Visual FoxPro does not allow the removal of an object if code for that object is currently executing. Attempts to remove the object are delayed until the object code has completed execution, and Visual FoxPro does not display any warning or errors. This leads users to believe that the object has been removed when it has not been removed. Trying to add the object back into the container causes the "A member object with this name already exists" error because the object was not removed and is still a part of the container.

Steps to Reproduce Behavior
  Execute the following code (which instantiates a Form with a CommandButton object): PUBLIC oF     oF = CreateObject('form') oF.AddObject('oCont','Cont') oF.Show

DEFINE CLASS Cont AS Container ADD OBJECT oCmd AS Cmd Visible = .t.     ENDDEFINE

DEFINE CLASS Cmd AS CommandButton Top = 50 Visible=.t.       PROCEDURE click oF.RemoveObject('ocont')    && No error occurs oF.AddObject('ocont','cont') && Produces error ENDPROC ENDDEFINE  When the Form appears, click on the command button. The "A member object with this name already exists" error message appears.

Additional query words: VFoxWin kbdse

Keywords: KB158822

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