java barcode scanner example code Figure 13-14 Select an Element type to compare against in Software

Creator Code39 in Software Figure 13-14 Select an Element type to compare against

Figure 13-14 Select an Element type to compare against
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You can select which type of element you wish to compare against your selected GPRM source Select
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the list goes on there are thousands of ways to use Scripting, GPRMs, and SPRMs to do exciting things in your DVD
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Figure 13-15 Select a specific target for the comparison with value
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Newcomers to scripting are often challenged by the Conditional Command their first few times The key concept is this: The Compare test you define will be evaluated to see if it is true There are MANY ways to establish the test, more than just checking to see if something is equal to 1 or zero For example: You could use a Compare to check for a GPRM value which signifies where in the Menu structure you are 1 means Menu 1, 2 means Menu 2, etc This could then be used to direct navigation precisely back to a specific Menu Element; or You could check for the value of SPRM 7, to see which was the last chapter marker passed that value could be used to JUMP back into the Track to that chapter point, if you didn t want to use resume ; or You could check for the value of SPRM 8 to see what was the last button pressed on a menu and set it to the next button value (these are in steps of 1024, by the way), thereby advancing the menu button highlight to the NEXT button in series;
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DVD Commands generally correspond to two types: navigation commands and presentation commands Navigation Commands make the DVD change where it is playing, and Presentation Commands make it change how or what it is playing, by adjusting audio, subtitles, angles, etc The few commands that don t fit this description perform general functions, like changing the mode of a GPRM, or exiting The following Script Commands are available (see Fig 13-16)
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Figure 13-16 Command select pop-up (top of Command Line Inspector)
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NOP JUMP Set GPRM Goto [another script line] Set System Stream Resume
Basic Scripting for DVD Studio Pro 4
GPRM Mode Exit Exit Pre-Script Jump Indirect
The NOP Command
Every new command line contains a NOP command by default The NOP Command ( No Operation ) is nothing more than a placeholder it keeps the command slot occupied until it can be replaced by a real command Leaving a NOP command in your DVD project is a sloppy technique, as many DVD players react badly when they encounter this command, sometimes stopping immediately during playback!
The JUMP Command
JUMP commands are navigation commands, pure and simple They cause the DVD to navigate immediately from the current location to the new location specified in the Jump To command target in Pane 2 This new location can be a Menu or Button, a Track, Story or Marker, a Slideshow or Slide, or even another Script The rare exception seems to be targeting a Button over Video within a Track element Jump Commands may be made Conditional if the Compare Command is activated, and a comparison programmed (see Fig 13-17) If the Compare Command equates to True, then the Jump Command will be executed If not true, the command is skipped, and the Script continues to the next Command Line, looking for another valid command
Figure 13-17 A Jump Command with Target pop-up revealed
Jump Command options
JUMP commands (not JUMP Indirect ) must directly specify the destination they are jumping to, unless the GPRM based option is activated In this
case, the value in a GPRM may be used to point to a Button within a Menu or a Marker within a Track or Story The value specified should respect the limit allowed for Buttons (1 36 in 4 3 menus, 1 18 in dual aspect ratio menus) or Markers (1 99) Marker numbers in excess of 99 will be ignored, and navigation will land on Marker 1 Setting Jump To to a Button or Marker within an Element will be ignored if the GPRM Based selection is invoked Only the root element will be targeted, and the GPRM will determine which Button (on a Menu) or Marker (in a Track, Story) will be the target (see Fig 13-18)
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