#import "MyObject.h" 
#import "MyDocumentController.h" 
@implementation  MyObject

- ( IBAction )myAction:( id )sender
{
MyDocumentController *dController1 = [MyDocumentController sharedDocumentController];
id  doc1;
NSOpenPanel *oPanel = [NSOpenPanel openPanel];

doc1 = [dController1 makeUntitledDocumentOfType: @"txt" ];


// ファイル選択 
NSLog([NSString stringWithFormat: @"%d" ,
[dController1 runModalOpenPanel:oPanel
forTypes:[NSArray arrayWithObject: @"txt" ]]
]);


NSLog([dController1 displayNameForType: @"txt" ]);

}

@end