The above problem can be resolved just by declaring a global variable in your SSDragDropView.h class.
#import <Cocoa/Cocoa.h>
NSString *myTextToDisplay;
@interface SSDragDropView : NSView
{
The same can be set inside the desired delegate method
- (void)concludeDragOperation:(id <NSDraggingInfo>)sender {
// .... //Your Code
NSString *textDataFile = [NSString stringWithContentsOfURL:url usedEncoding:nil error:nil];
myTextToDisplay = textDataFile;
// .... //Your Code
}
:)