Inside Macintosh: Interapplication Communication /

Chapter 4 - Responding to Apple Events / Reference to Responding to Apple Events

Routines for Responding to Apple Events / Counting the Items in Descriptor Lists

AECountItems

You can use the AECountItems function to count the number of descriptor records in any descriptor list.

FUNCTION AECountItems (theAEDescList: AEDescList; 
                       VAR theCount: LongInt): OSErr;

theAEDescList

The descriptor list to be counted.

theCount

The AECountItems function returns the number of descriptor records in the specified descriptor list in this parameter.

RESULT CODES

noErr	0	No error
errAENotAEDesc	-1704	Not a valid descriptor record

SEE ALSO

For an example of the use of AECountItems, see "Getting Data Out of a Descriptor List," which begins on page 4-31.