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Volume 6A: Motif Programming Manual
book

Volume 6A: Motif Programming Manual

by David Brennan, Dan Heller, Paula Ferguson
September 1993
Intermediate to advanced content levelIntermediate to advanced
1014 pages
28h 26m
English
O'Reilly Media, Inc.
Content preview from Volume 6A: Motif Programming Manual
Manual, Motif Edition. The string "Push Me" is the string value; the length of the string, including the
NULL−terminating byte, is 8.
The XtVaTypedArg method for specifying a compound string resource is only a programmatic convenience; it does
not save time or improve performance. The three−step process of creating, setting, and freeing the compound string
still takes place, but it happens within Motif's compound string resource converter. Using automatic conversion is
actually slower than converting a string using XmStringCreateLocalized(). However, unless you are creating
hundreds of strings, the difference is negligible. The convenience and elegance of the XtVaTypedArg method may
be worth the performance tradeoff.
The reason most of the examples in this book do not make use of the feature is that we are trying to demonstrate good
programming techniques tuned to a large−scale, production−size, and quality application. Using the XtVaTypedArg
method for compound strings is painfully slow when repeated over hundreds of Labels, PushButtons, Lists, and other
widgets. The XtVaTypedArg method is perfectly reasonable for converting other types of resources, however. If
you are converting a lot of values from one type to another, it is in your own best interest to evaluate the conversion
process yourself by testing the automatic versus the manual conversion methods.
20.2.2 Font List Tags
Motif provides two different compound string creation routines that allow you to specify a tag used to associate ...
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Publisher Resources

ISBN: 9780596000431