I'm trying to use this NSWorkspace method to launch an application and print a document. I provide it with a FSRef-based NSAppleEventDescriptor but the only thing the workspace does is launching the app. Here is part of the code:

NSURL *documentURL = [[[NSURL alloc] initFileURLWithPath:[[openPanel filenames] objectAtIndex:c]] autorelease];
NSURL *applicationURL = NULL;
OSStatus resultCode = LSGetApplicationForURL((CFURLRef)documentURL, kLSRolesAll, NULL, (CFURLRef *)&applicationURL);
if (resultCode != noErr)
{
NSRunAlertPanel(NULL, [NSString stringWithFormat:@"%@ '%@'", NSLocalizedString(@"CouldntFindAppForDocument", @""), [[[openPanel filenames] objectAtIndex:c] lastPathComponent]], NULL, NULL, NULL);
        return ;
}
NSBundle *appBundle = [NSBundle bundleWithPath:[applicationURL path]];
BOOL couldLaunchApp = NO;
NSAppleEventDescriptor *descriptor = [self descriptorWithPath: [[openPanel filenames] objectAtIndex:c]];
if (descriptor != NULL)
couldLaunchApp = [[NSWorkspace sharedWorkspace] launchAppWithBundleIdentifier:[appBundle bundleIdentifier] options:NSWorkspaceLaunchAndPrint additionalEventParamDescriptor:descriptor launchIdentifier:NULL];
if ( ! couldLaunchApp)
NSRunAlertPanel(NULL, [NSString stringWithFormat:@"%@ '%@'", NSLocalizedString(@"CouldntAddDocumentToReader", @""), [[[openPanel filenames] objectAtIndex:c] lastPathComponent]], NULL, NULL, NULL);

What am I doing wrong?

Thanks in advance.


-Laurent.
--
Laurent Daudelin
AIM/iChat/Skype:LaurentDaudelin                                 
http://nemesys.dyndns.org
Logiciels Nemesys Software                                              
laurent.daude...@verizon.net
Photo Gallery Store: http://laurentdaudelin.shutterbugstorefront.com/g/galleries

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