On 18 Apr '08, at 1:21 PM, David Wilson wrote:
A command line tool or a true background daemon can't really pull it off- the process wouldn't have a connection to the window server to actually do any of that.
A command-line tool, invoked from a logged-in user account, can use a GUI if it's linked against the appropriate libraries (like AppKit). As a trivial example, you can launch a regular Cocoa app from a shell by just running its binary directly.
But this usually isn't a good idea for something that's primarily meant as a daemon or tool. A better way to do simple alert-style interaction is to use the API in CFUserNotification.h. This doesn't require you to link against anything higher-level than CoreFoundation. The downside is that it's kind of messy to use for anything beyond a simple "message and OK button" alert; but I think there is sample code with examples.
—Jens
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