Newbie Function Declaration Question

Question

I'm getting a "method undeclared" error in XCode on my method "useOpenFileToGetFSRef".
INTERFACE:
@interface MyDocument : NSPersistentDocument {
IBOutlet NSString *nameOfSourceFile;
- (IBAction) getSourceFile:(id)sender;
- (FSRef) useOpenFileToGetFSRef; //THIS IS THE METHOD I'M TRYING TO DECLARE
@end
IMPLEMENTATION:
@implementation MyDocument
- (FSRef)useOpenFileToGetFSRef //NO COMPILE ERROR FOR THIS LINE
//function body...
- (IBAction) getSourceFile:(id)sender{
FSRef theFileFSRef = useOpenFileToGetFSRef; //COMPILE ERROR: 'useOpenFileToGetFSRef' UNDECLARED
FSRef a = theFileFSRef;
//more...
@end
How do I correct this? Thanks in advance for any info.

Answer 1

Write it as a function:
FSRef useOpenFileToGetFSRef(void)
of course, you won't have access to any of the data structures in the document.