====== ModifyVDL ======

Changes one or more attributes of a VDL.

==== Synopsis ====

''%%Err ModifyVDL (Item vdlItem,TagArg *vdlTags) Err ModifyVDLVA (Item vdlItem,uint32 vdlTags,...)%%''

==== Description ====

This call changes one or more attributes of a VDL. When executed, it looks through each entry of the VDL for opcodes, and then changes the specified attributes in each opcode (if they need changing). This means that ''%%ModifyVDL()%%'' affects the entire VDL, regardless of its type. It works equally well on simple VDLs and custom VDLs.

This is a preliminary implementation of ''%%ModifyVDL()%%''. Future implementations will include the ability to modify individual VDL entries.

==== Arguments ====

  * **vdlItem** Item number of the VDL to be modified.

  * **vdlTags** Pointer to the array of TagArgs used to specify the modifications to the VDL.

==== Return Value ====

The call returns a 0 if successful or an error code (a negative value) if an error occurs.

==== Implementation ====

Folio call implemented in Graphics folio V21.

==== Associated Files ====

graphics.h, graphics.lib

==== See Also ====

''%%SubmitVDL%%''(), [[:documentation:development:opera:pf25:ppgfldr:ggsfldr:gprfldr:01gpr067#xref20050|SetVDL]](), [[:documentation:development:opera:pf25:ppgfldr:ggsfldr:gprfldr:01gpr014#xref24670|DeleteVDL]]()