Inside Macintosh: Interapplication Communication /

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

Routines for Responding to Apple Events / Getting the Sizes and Descriptor Types of Descriptor Records

AESizeOfNthItem

You can use the AESizeOfNthItem function to get the size and descriptor type of a descriptor record in a descriptor list.

FUNCTION AESizeOfNthItem (theAEDescList: AEDescList; 
                          index: LongInt; VAR typeCode: DescType; 
                          VAR dataSize: Size): OSErr;

theAEDescList

The descriptor list containing the descriptor record.

index

The position of the descriptor record in the list (for example, 2 specifies the second descriptor record).

typeCode

The descriptor type of the descriptor record.

dataSize

The length (in bytes) of the data in the descriptor record.

RESULT CODES

noErr	0	No error
errAEDescNotFound	-1701	Descriptor record was not found
errAEReplyNotArrived	-1718	Reply has not yet arrived