Re: [Q] How to let the pasteboard know a file type?

Fri, 19 Dec 2008 09:47:13 -0800

Hello. I found out that NSCreateFilenamePboardType() would help. So, I tried it like : 

My code example is :

In awakeFromNib


NSString 
<http://developer.apple.com/documentation/Cocoa/Reference/Foundation/ObjC_classic/Classes/NSString.html>
 *quicktimeFileNamesPboardType = NSCreateFilenamePboardType(@"mov");

[myNSTableView registerForDraggedTypes:[NSArray 
<http://developer.apple.com/documentation/Cocoa/Reference/Foundation/ObjC_classic/Classes/NSArray.html>
 arryWithObject:quickTimeFileNamesPboardType]];


In -tableView:writeRowsWithIndexes:toPasteboard:


NSString 
<http://developer.apple.com/documentation/Cocoa/Reference/Foundation/ObjC_classic/Classes/NSString.html>
 *quicktimeFileNamesPboardType = NSCreateFilenamePboardType(@"mov");

anIndex = [selectedRowsIndexSet firstIndex];
while( anIndex != NSNotFound )
{
   fileName = [NSString 
<http://developer.apple.com/documentation/Cocoa/Reference/Foundation/ObjC_classic/Classes/NSString.html>
 stringWithFormat:@"%@/%...@.mov", configPath, [[dataArray objectAtIndex:anIndex] 
name]];
   [fileNamesArray addObject:fileName];

   // Next index
   anIndex = [selectedRowIndexSet indexGreaterThanIndex:anIndex];
}

[pboard declareTypes:[NSArray 
<http://developer.apple.com/documentation/Cocoa/Reference/Foundation/ObjC_classic/Classes/NSArray.html>
 arrayWithObjects:quicktimeFilenamesPboardType, nil] owner:nil];
isSuccessful = [pboard setPropertyList:fileNamesArray 
forType:quicktimeFilenamesPboardType];

...
When I check what information is exported from my program with the Drag Peeker X, it shows : 


Item Reference:     19884c10
  Item Bounds (tlbr): { 86, 1, 104, 191 }
  Number of flavors: 0


Strangely, it doesn't have any flavor of data.
Is there anything wrong how I use the NSCreateNSFilenamePboardType? How to use it properly? 

Thank you in advance.
P.S. By the way, is it normal to put 'furl' and 'hfs' flavor when NSFilenamesPboardType is used? Because an array of file names are added to the pasteboard, I thought that only file name strings were added. But it turned out no-so-true. 

JongAm Park wrote:

Hi,
Thanks to a utility program, called DragPeeker X, I found out some clue why the FCP treated dragged file as a file with unknown type. 

When I dragged the same file from the Finder to the FCP, it shows :

Number of Items:     1
1. Item Reference:     19884c10
   Item Bounds (tlbr): { 86, 1, 104, 191 }
   Number of flavors: 2
   1.    Flavor Type: 'furl'
       Flavor Flags: 0
       Length: 54
       Data:
66 69 6C 65 3A 2F 2F 6C 6F 63 61 6C 68 6F 73 74 file://localhost 2F 56 6F 6C 75 6D 65 73 2F 31 37 32 2E 31 36 2E /Volumes/172.16. 32 34 36 2E 31 34 36 2F 4D 4F 56 2F 30 30 30 33 246.146/MOV/0003 59 42 2E 6D 6F 76 YB.mov 2. Flavor Type: 'hfs ' 
       Flavor Flags: 300
       Length: 80
       Data:
4D 6F 6F 56 3F 3F 3F 3F 00 00 FF 98 00 00 00 13 MooV????........ 0A 30 30 30 33 59 42 2E 6D 6F 76 DC 00 00 00 00 .0003YB.mov..... FF FF FF FF 00 00 00 00 00 25 F0 A0 A0 31 60 34 .........%...1`4 91 F6 C0 A0 BF FF DA 80 84 04 20 42 91 F6 6B 44 .......... B..kD 91 F6 C0 A0 00 86 B4 00 17 BB 17 FC BF FF DA C4 ................ 

But if I drag one from my application to the FCP, it shows :

Number of Items:     1
1. Item Reference:     c0c0a
   Item Bounds (tlbr): { 219, 244, 219, 244 }
   Number of flavors: 2
   1.    Flavor Type: 'furl'
       Flavor Flags: 0
       Length: 54
       Data:
66 69 6C 65 3A 2F 2F 6C 6F 63 61 6C 68 6F 73 74 file://localhost 2F 56 6F 6C 75 6D 65 73 2F 31 37 32 2E 31 36 2E /Volumes/172.16. 32 34 36 2E 31 34 36 2F 4D 4F 56 2F 30 30 30 33 246.146/MOV/0003 59 42 2E 6D 6F 76 YB.mov 2. Flavor Type: 'hfs ' 
       Flavor Flags: 0
       Length: 80
       Data:
00 00 00 00 00 00 00 00 00 00 FF 98 00 00 00 13 ................ 0A 30 30 30 33 59 42 2E 6D 6F 76 FC 00 25 DB A0 .0003YB.mov..%.. 00 00 00 06 00 18 80 00 00 00 00 60 00 25 8E B0 ...........`.%.. 90 10 7A 44 BF FF DA 70 44 04 20 42 90 10 7D EC ..zD...pD. B..}. 00 00 00 02 BF FF DA 90 00 00 00 20 BF FF DC F4 ........... ....
( I also tried NSURLPboardType and NSFileContentsPboardType. But they didn't make information like above appear. ) 
The PboardType I used was NSFilenamesPboardType.

The major difference between those are in the 2nd flavor type 'hfs'.
Their flavor flags are different: one is 300, while the other is 0.

What actually matters, I think, is the data of the 2nd flavor.
The one using the Finder starts with MooV????, which says that the dragged item is a QuickTime movie, while the one from my application doesn't contain anything. ( all 0's. )
So, is there any way to mark that the interested file is in a specific type, i.e. QuickTime movie file? 

Thank you.


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