Object / Handle
Blitz3D Forums/Blitz3D Programming/Object / Handle
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Whenever I have something to learn, in this case understand that the keyword Handle keeps a indixe according to the created object (if it is not that way correct please), but do not understand the "Objetc", what does to receive the handle, what does?Type MY_TYPE Field whatever End Type Global a_custom_type.MY_TYPE = New MY_TYPE ; This could also be a local type pointer. integer_variable% = Handle( a_custom_type.MY_TYPE ) Print integer_variable% a_custom_type.MY_TYPE = Object.MY_TYPE( integer_variable% ) Print a_custom_type.MY_TYPE\whatever WaitKey() |
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| the command Handle(instance of a type) allows you to get the reference of this instance of a "Type" the command Object.Type(reference) allows you to access directly the instance of a "Type" having this reference (some people also call this reference, an "handle", an "id") without using a for next loop You usually store the reference of the instance in the name of an entity (collidable, pickable) of this instance with NameEntity() NameEntity(i\Entity,Handle(i)) After a collision or a linepick, you can get the name of a collided/picked entity with EntityName() reference% = Int(EntityName(Entity)) then you can directly access and then read/write/modify this instance of a Type i.Type = Object.Type(reference) i\life# = i\life - 1 See this code example : http://www.blitzbasic.com/codearcs/codearcs.php?code=3095 |
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| ; If you let the concept evolve, eventually you can use the OBJECT and HANDLE ; commands to create abstract data types. ; Sorry I don't really have any great examples yet.... For z=1 To 20 this = Object.path(z) If this = Null Then Exit Print" object("+z+") :: "+pathname$(this) Next Type CustomFolder ; place various fields here. ; ... Field self ; store a copy of its own handle End Type |
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