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COMPOBJ( ) Function

  • 项目

Compares the properties of two objects and returns True (.T.) if their properties and property values are identical.

COMPOBJ(oExpression1, oExpression2)

Parameters

  • oExpression1, oExpression2
    Specifies the objects to compare. oExpression1 and oExpression2 can be any expressions that evaluate to objects, such as object references, object variables, or object array elements.

Return Values

Logical

Remarks

COMPOBJ( ) returns False (.F.) if an object has a property that the other object doesn't have, or if the objects have identical properties but the values of one or more properties differ.

Example

In the following example, two ListBoxes named lstMyList1 and lstMyList2 and a ComboBox named cmbMyCombo are created. The Name property of each ListBox is displayed.

COMPOBJ( ) is used to compare the properties of the first ListBox with the properties of the ComboBox. Because many of the properties are different, .F. is displayed. COMPOBJ( ) is then used to compare the properties of the first ListBox with the properties of the second ListBox. Because the Names properties are different, .F. is displayed. The second ListBox lstMyList2 is replaced with the first ListBox lstMyList1, and COMPOBJ( ) is used to compare the properties. Because their properties are identical, .T. is displayed.

lstMyList1 = CREATEOBJ('ListBox')  && Creates a ListBox
lstMyList2 = CREATEOBJ('ListBox')  && Creates a second ListBox
cmbMyCombo = CREATEOBJ('ComboBox')  && Creates a ComboBox
lstMyList1.Name = 'list1'
lstMyList2.Name = 'list2'

CLEAR
? lstMyList1.Name  && Displays List1 Name property
? lstMyList2.Name  && Displays List2 Name property

? COMPOBJ(lstMyList1, cmbMyCombo)     && Displays .F.
? COMPOBJ(lstMyList1, lstMyList2)     && Displays .F., different Names
lstMyList2.Name = lstMyList1.Name
? COMPOBJ(lstMyList1, lstMyList2)     && Displays .T., same properties

See Also

CREATEOBJECT( ) | DEFINE CLASS | GETOBJECT( ) | SET CLASSLIB