View Full Version : NSFilesPromisePboardType

Nov 14, 2010, 01:52 PM
I am updating some programs to work in Snow leopard (10.6). 10.6 changed the pasteboard system. Copy and paste is working (finally), but dragging of "filepromises" is not.

According to the documentation (NSString *)kPasteboardTypeFileURLPromise is the new pasteboardtype rather than NSFilesPromisePboardType. But when I try to drag something to the finder, no new files are added.

I am using the following code in a "dummy" project to understand the new pasteboard system.
The tableview is connected via its delegate and datasource to an instance of MyDocument.

#import "MyDocument.h"

- (BOOL)tableView:(NSTableView *)aTableView writeRowsWithIndexes:(NSIndexSet *)rowIndexes toPasteboard:(NSPasteboard *)pboard
MyClass *drag1 = [[MyClass alloc] initWithName:@"drag1"];
[pboard clearContents];
[pboard writeObjects:[NSArray arrayWithObjects:drag1,nil]];

return YES;

#import "MyClass.h"
@implementation MyClass

@synthesize name;

-(id) initWithName:(NSString *) value
self = [super init];
if (self != nil) {
[self setValue:value forKey:@"name"];
return self;


+ (NSArray *)readableTypesForPasteboard:(NSPasteboard *)pasteboard
return [NSArray arrayWithObjects:NSPasteboardTypeString,nil];

-(NSPasteboardReadingOptions)readingOptionsForType:(NSString *)type pasteboard:(NSPasteboard *)pboard
return NSPasteboardReadingAsData;


-(NSArray *) writableTypesForPasteboard:(NSPasteboard *)pasteboard
return [NSArray arrayWithObjects:(NSString *)kPasteboardTypeFileURLPromise,NSPasteboardTypeString,@"be.terje.MyPasteboardType",nil];

-(id) pasteboardPropertyListForType:(NSString *)type {NSLog(@"requestDataForType:%@",type);
NSString *str = [NSString stringWithFormat:@"Test \t string data: %@", name];

if ([type isEqualToString:(NSString *)kPasteboardTypeFileURLPromise])
return [NSURL URLWithString:@"Users/Terje/Developer/Snowy/temp/testname-0.txt"];

if ([type isEqualToString:NSPasteboardTypeString])
return str;

NSDictionary *d1 = [NSDictionary dictionaryWithObjectsAndKeys:str,@"name",nil];
return [NSKeyedArchiver archivedDataWithRootObject:d1];

if ([type isEqualToString:@"MyPasteboardType"])
return [@"my type of pasteboard" dataUsingEncoding:NSUTF8StringEncoding];
return [str dataUsingEncoding:NSUTF8StringEncoding];