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objective-ccocoadesktopsandboxnsworkspace

Determining the Destination of a Message for Sandboxing in Cocoa

So I just added sandboxing to one of my products. It's totally functional except that the final step in the workflow is to set the desktop. It does this via NSWorkspace. When I call 

[[NSWorkspace sharedWorkspace] setDesktopImageURL:[NSURL fileURLWithPath:imagePath]
                                        forScreen:screen
                                          options:nil
                                            error:&error];

I receive the following error:

*** attempt to post distributed notification 'com.apple.desktop' thwarted by sandboxing.

Right, so I need a temporary exception like so:

<key>com.apple.security.temporary-exception.apple-events</key>
<array>
    <string>XXXXX</string>
</array>

So ultimately I need to figure out what goes in the XXXXX, right? What handles desktop settings? And, more generically, is there a simple way to determine the target bundle of a message?

Solution

  • I experienced the same problem, but I found a different workaround. By enabling the "Allow Calendar Data Access" entitlement, setting a new wallpaper through NSWorkspace works.

    I know this is a pretty strange workaround and I don't know if it is future-proof (Apple may block it in future versions). It works at the time of writing, and I thought it was worth sharing it with the next person having this problem.