Eliminates an object instance that was created with the CREATE statement. After a DESTROY statement, properties of the deleted object instance can no longer be referenced.
DESTROY objectvariable
Parameter |
Description |
|---|---|
objectvariable |
A variable whose datatype is a PowerBuilder object |
When you are finished with an object that you created, you can call DESTROY to release its memory. However, you should call DESTROY only if you are sure that the object is not referenced by any other object. PowerBuilder’s garbage collection mechanism maintains a count of references to each object and destroys unreferenced objects automatically.
For more information about garbage collection, see “Garbage collection”.
All objects are destroyed automatically when your application terminates.
Example 1 The following statement destroys the transaction object DBTrans that was created with a CREATE statement:
DESTROY DBTrans
Example 2 This example creates an OLEStorage variable istg_prod_pic in a window’s Open event. When the window is closed, the Close event script destroys the object. The variable’s declaration is:
OLEStorage istg_prod_pic
The window’s Open event creates an object instance and opens an OLE storage file:
integer li_result
istg_prod_pic = CREATE OLEStorage
li_result = stg_prod_pic.Open("PICTURES.OLE")
The window’s Close event destroys istg_prod_pic:
integer li_result
li_result = istg_prod_pic.Save( )
IF li_result = 0 THEN
DESTROY istg_prod_pic
END IF
