On Apr 23, 2009, at 7:50 PM, Laurent Daudelin wrote:
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?
I don't recommend using a -launchApp... method to act on a document.
To print a document, I recommend using -
openURLs:withAppBundleIdentifier:options:additionalEventParamDescriptor:launchIdentifiers
: passing NSWorkspaceLaunchAndPrint in the options. Also, pass nil
for the application bundle identifier, since you just want to use the
default. That avoids the overly complicated use of
LSGetApplicationForURL -> URL -> path -> NSBundle -> bundle ID. Also,
the above code snippet snippet seems to be in a loop over the array of
filenames returned by an open panel. With this method, you can
convert that to an array of URLs and make just one NSWorkspace method
call to print them all in their appropriate applications.
Don't bother passing an additionalEventParamDescriptor. It's hard to
get right, and I've seen evidence that it isn't even passed properly.
(I've dropped down to direct use of Launch Services, which did pass
the parameter correctly.)
Cheers,
Ken
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