CODEWITHSUNDEEP
objective-cmacoscocoa
Zili FENG
Zili FENG

Reputation: 301

What may cause failure to launch two copies of an OS X app on one machine?

I'm developing a simple text editor app on OS X platform, which only has a single window containing a TextView. I want my app to be able to launch multiple copies simultaneously on one machine (to let user compare two files edited). This automatically works well on almost every machine except one. On this particular machine, the newest version of OS X is installed. I Googled around but could not find any clue why this may happen.

Detail 1: on this machine, when a new editor app is launched, the top bar displays "Window" instead of "Untitled" (which is the case on all other machines).

Detail 2: I have "Visible At Launch" checked for the main window. Before checking it, the particular machine cannot even launch one copy of the app (the app icon appears on the dock but the window never appears even if you click the app icon), which also does not happen on any other machine.

Can you offer any hint?

Upvotes: 0

Views: 48

Answers (1)

Bao Nguyen
Bao Nguyen

Reputation: 137

If you want to develop a text editor, you should create a Cocoa document-based application.

A Cocoa document-based app use NSDocument's subclass to handle documents, such as autoSaving, opening a document, saving a document, undo manager, edit multiple document at the same time...

You see an example at my post. If your language is Objective C, take a look at this answer.

Upvotes: 1

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