Line-by-line Anatomy of Menu.c

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FtrGet( sysFtrCreator, sysFtrNumROMVersion, &romVersion );
This function Err FtrGet( UInt32 creator, UInt16 featureNum, UInt32 *valueP ) gets a feature.

• creator: Creator ID, which must be registered with PalmSource, Inc
• featureNum: Feature number of the feature
• valueP: Value of the feature is returned here

FrmAlert( RomIncompatibleAlert );
This function UInt16 FrmAlert( UInt16 alertId ) creates a modal dialog from an alert resource and displays it until the user selects a button in the dialog.

alertId: ID of the alert resource

FrmDispatchEvent( &event );
This function Boolean FrmDispatchEvent( EventType *eventP ) dispatches an event to the application's handler for the form.

eventP: Pointer to an event

FrmSetEventHandler( frm, MainFormHandleEvent );
This function void FrmSetEventHandler( FormType *formP, FormEventHandlerType *handler ) registers the event handler callback routine for the specified form.

• formP: Pointer to the form object (FormType structure)
• handler: Address of the form event handler function, FormEventHandlerType( )

FrmDispatchEvent( ) calls this handler whenever it receives an event for a specific form. FrmSetEventHandler must be called right after a form resource is loaded. The callback routine it registers is the mechanism for dispatching events to an application.