Avoid reserved IDs in Symbian resource file enumerations (Known Issue)
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Revision as of 06:30, 12 March 2012
Article Metadata
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Article
Overview
Menu item command IDs and dialog item ID values of 0 will cause problems which may be hard to identify and debug.
Detailed description
Menu item (RESOURCE MENU_ITEM) command IDs and dialog item (RESOURCE DLG_LINE) will cause problems which may be hard to identify and debug if 0 is used as the ID value.
Solution
Always use a non-zero value for MENU_ITEM command IDs, because 0 is reserved for the EEikCmdCanceled command.
Similarly, a dialog's item (DLG_LINE) IDs must be non-zero. Dialog items with a zero ID will result in "Eikon-Dialog 3" panic, where 3 is listed as EEikDialogPanicFocusableLineWithIdZero.
Typically, applications define resource ID values as enumerations and a common mistake is to begin the enumeration from 0 (default), which leads to these hard-to-identify problems.
