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vb6clonepropertybag

How to clone an object in VB6


I am trying to automatically clone an object without having to instantiate a new one and manually copy every single variable.

I remember back in the day (when I did VB6 everyday) I came up with a method of cloning objects using the PropertyBag, which was pretty cool. But I've lost the code and don't remember how to do it anymore.

Does anyone remember or have another method?


Solution

  • Is this what you were looking for? Article is copied below for posterity.

    Serialize Data Using a PropertyBag

    You can serialize your data quickly by placing it into a PropertyBag object, then reading the PropertyBags Contents property. This property is really a Byte array that is a serial representation of the data in your PropertyBag object. You can use this byte array for many purposes, including an efficient means of data transmission over DCOM:

    Private Function PackData() As String
        Dim pbTemp  As PropertyBag
    
        'Create a new PropertyBag object
        Set pbTemp = New PropertyBag
        With pbTemp
            'Add your data to the PB giving each item a 
            'unique string key
            Call .WriteProperty("FirstName", "John")
            Call .WriteProperty("MiddleInitial", "J")
            Call .WriteProperty("LastName", "Doe")
    
            'Place the serialized data into a string 
            'variable.
            Let PackData = .Contents
        End With
    
        Set pbTemp = Nothing
    End Function
    

    To retrieve the serialized data, simply create a new PropertyBag object and set the serialized string to its Contents property. Convert the string into a byte array before assigning it to the Contents property:

    Private Sub UnPackData(sData As String)
        Dim pbTemp  As PropertyBag
        Dim arData()    As Byte
    
        'Convert the string representation of the data to 
        'a Byte array
        Let arData() = sData
    
        'Create a new PropertyBag object
        Set pbTemp = New PropertyBag
        With pbTemp
            'Load the PropertyBag with data
            Let .Contents = arData()
    
            'Retrieve your data using the unique key
            Let m_sFirstName = .ReadProperty("FirstName")
            Let m_sMiddleInitial = _
                .ReadProperty("MiddleInitial")
            Let m_sLastName = .ReadProperty("LastName")
        End With
    
        Set pbTemp = Nothing
          End Sub
    

    Mike Kurtz, McKees Rocks, Pa.