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Re: GWorkspace Dragndrop Question

From: Fred Kiefer
Subject: Re: GWorkspace Dragndrop Question
Date: Mon, 23 Jun 2003 15:32:18 +0200
User-agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.2.1) Gecko/20021204

Hi Chad,

what you describe is an inconsistency between GWorkspace and the GNUstep GUI. And as you did find out GUI in this case is right, as it does the same as Cocoa. They both expect the copy/paste of NSFilenamesPboardType to work with the propertylist interface of the pastboard (which internally uses an NSSerializer), wheras GWorkspace uses an NSArchiver for the same task. The difference can be seen in the method on [NSView dragFile:fromRect:slideBack:event:] in GUI and the methods on IconViewsIcon in GWorkspace. Gworkspace will need some corrections here.

I am also not sure if the GNUstep implementation is fully correct, as a single filename may be set here, where I would always expect an array of filenames. But than again, I did write this code some time ago, so it may be wrong. It looks like this is closely related with NSImage also only expecting one file name in the pasteboard. Both should be corrected.


address@hidden wrote:
Ok, I think I got it...

GNUstep doest like to use:
NSArray* files = [pasteboard propertyListForType:NSFilenamesPboardType],

(but Cocoa does)

Instead I used a :

NSData* pbData = [pasteboard dataForType:NSFilenamesPboardType]
and then did a
NSArray* files = [NSUnarchiver unarchiveObjectWithData: pbData]

to get the filenames and it seems to work fine...

Now I wonder if this will work in Cocoa... This method of doing this seems to be depreciated in Cocoa.


On Saturday, June 21, 2003, at 11:19  PM, address@hidden wrote:

Hello Enrico,

I'm making a pure OpenStep, in both Cocoa & GNUstep. But I'm having a problem with drag events from GWorkspace.

When my app is running in OS X, I can retrieve the filenames being dragged (we both know how that is done) from the Finder with no problem at all.

However in GNUstep, when I'm getting doing my draggingUpdated and looking for what files GWorkspace is passing I can't get a valid NSArray of NSStrings from [pasteboard propertyListForType: NSFilenamesPboardType, I get a nil.

Before I do that I do check to see if you are passing a NSFilenamesPboardType and indeed you are. However, when (Gnustep version) NSProperty tries to deserialize it it chokes and return nil. Gnustep consoles out a "Bad serialized data"

Any idea why this is happening? I imagine I am writing the first app that tries to accept dragged files from GWorkspace so maybe you are doing something odd in your D&D, or maybe this is a gnustep bug? I would greatly appreciate it if you could check this out on your end. I'm gonna take a stab at the GWorkspace sources myself but you know them way better than I do, of course, so you may already be aware of what type of problem is going on.

I'm also gonna post this in gnustep-dev in case it is a gnustep bug that somewhere there can shed some light on.

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