Legacy Document

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

AESizeOfAttribute

You can use the AESizeOfAttribute function to get the size and descriptor type of an Apple event attribute.

FUNCTION AESizeOfAttribute (theAppleEvent: AppleEvent; 
                            theAEKeyword: AEKeyword; 
                            VAR typeCode: DescType; 
                            VAR dataSize: Size): OSErr;

theAppleEvent

The Apple event containing the desired attribute.

theAEKeyword

The keyword that specifies the attribute.

typeCode

The descriptor type of the attribute.

dataSize

The length, in bytes, of the data in the attribute.

RESULT CODES

noErr	0	No error
errAEDescNotFound	-1701	Descriptor record was not found
errAENotAEDesc	-1704	Not a valid descriptor record
errAEReplyNotArrived	-1718	Reply has not yet arrived