If my application crashes i wish for the coredump file to be stored in a particular directory. It is possible to change the location from the command line but i wish my application to change this path programatically and if possible only for a single (its self) application. Is this possible?
No it's not. But if you're not sandboxed, you can look at the files in ~/Library/Logs/DiagnosticLogs and move them somewhere else the next time you're launched.
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I'm currently developing a macOS cocoa application. Within one of the windows I'm gathering values from multiple arrays and building an xml file as a key/value backup. After saving the file I'm wanting to set a custom icon for the particular xml file. I've searched throughout stackoverflow and the rest of the web and haven't been able to find any solutions. Throughout the different functions within my application I'm able to pull a previously set icon from a file but haven't been able to set one for a newly created file. Any assistance would be greatly appreciated.
In order to change the XML file icon you should use that:
[[NSWorkspace sharedWorkspace] setIcon:iconImage forFile:path options:0];
Where iconImage is a NSImage of the icon and path is the path of the xml file. Note that the change may not be visible until you rename the file or restart the computer. A workaround is renaming the xml file and then renaming it with the old name back again.
Also, note that macOS icons are different of Windows and Linux icons, so that icon may only be visible in macOS systems (in some cases, only in your machine).
I have a type of data file associated with my program. I can run my program by clicking on a shortcut, or by double-clicking on the data file. Standard Windows stuff.
However, I need to be able to set the Starts In folder to a specific folder. Everything is fine when I use the shortcut (because that has a Starts In parameter), but when I double-click on a data file, the Starts In defaults to the local folder of the data file, which is not what I want.
To be more specific, I'm using a network dongle protection system (Safenet SHK) that requires an XML file to be in the Starts In folder before the protection shell allows my code to be run, so I can't just change the folder in my program, because it hasn't run yet.
What can I do?
You could create a launcher application. This application would do nothing but set the working directory and then start the real application and pass in the name of the file the user is trying to open. Your application shortcut can point to your main application, but the file associations you create would use the launcher.
My requirement is to open a file like pdf/ppt etc and close it after 20 minutes. I am able to open the files appropriately thanks to NSWorkspace. But how can I close the files ?. NSWorkspace does not seem to have a close method.
NSWorkspace just asks the operating system to open the file, it doesn't maintain any connection to the file at all. The OS will open the file with whatever the default application is for that file type, unless you specify a particular application to use. Anything that happens with the file after that point is completely outside of your application's control because the file is being managed by another process.
You would need to use either AppleScript/Apple Events or the Accessibility Framework to control whatever application currently has the file open and ask it to close the file, but there is no guarantee that it will do so.
The only way to guarantee that you will be able to close the file is to open it in your app. Obviously, this is impossible if you need to open a variety of diverse and possibly proprietary file types.
This is only under windows env.
As I know windows os identifies associated application of a particular file by file extension.
Like wise each file (binary) starting with corresponding symbols ("starting symbols"). For an example .JPG starts with ÿØÿà. Let say I open this .JPG file in a Hex editor or a Text editor and then I change that starting symbols into another file type. for an example I can change ÿØÿà to .Eߣ (.mkv). So when I double click on the .JPG the Windows Photo Viewer says there are some errors or similar message. So I need to get some information about the application that tries to open that kind of a file. If I can, I need to open that file using the application that associated with "starting symbols".
Briefly when I open .JPG I need to open a default video player .mkv files. But It may not work for this example. Because I changed only the "starting symbols" of my .JPG.
Please give me any idea to do this.
Thanks!
When you encrypt the file, give it a new extension. e.g. Picture.jpg becomes Picture.encrypted-jpg. You then register as the handler for encrypted-jpg, decrypt the file, then launch the normal jpg handler.
When the shell is asked to perform a verb on a file, the shell does not use the contents of the file to determine which app to pass it to. The file extension is what determines how the file will be treated.
You wish to use the contents of the file to influence which app processes a shell verb. In order to do so you would need to create a launcher app that reads the file header and then decides which app to pass the file on to. You would assign your launcher app as the handler app for all file extensions that you were interested in.
Although you could do this, it would be much easier just to set the file extension appropriately.
The proper way to do this sort of thing is to replace the files with reparse points.
The downside is that this involves writing a file system filter driver, i.e., an operating system extension, which is a whole level of trouble above and beyond ordinary application programming. (Since Windows already does file encryption, I doubt it would be worth the effort.)
I want to be able to run a text editor from my app, as given by the user in the TEXT_EDITOR environment variable. Now, assuming there is nothing in that variable, I want to default to the TextEdit program that ships with OSX. Is it kosher to hardcode /Applications/TextEdit.app/Contents/MacOS/TextEdit into my app, or is there a better way to call the program?
Edit: For the record, I am limited to running a specific application path, in C. I'm not opening a path to a text file.
Edit 2: Seriously people, I'm not opening a file here. I'm asking about an application path for a reason.
In your second edit it makes it sound like you just want to get the path to TextEdit, this can be done easily by using NSWorkspace method absolutePathForAppBundleWithIdentifier:
NSString *path = [[NSWorkspace sharedWorkspace] absolutePathForAppBundleWithIdentifier:#"com.apple.TextEdit"];
Mac OS X has a mechanism called "uniform type identifiers" that it uses to track associations between data types and applications that can handle them. The subsystem that manages this is Launch Services. You can do one of two things:
If you have a file with a reasonably well-known path extension, e.g. .txt, you can just ask NSWorkspace to open the file in the appropriate application.
If you don't have a well-known path extension, but you know the type of data, you can ask Launch Services to look up the default application for that type, and then ask NSWorkspace to open the file in that specific application.
If you do it this way you'll get the same behavior as the Finder, and you won't have to fork()/exec() or use system() just to open a file.
I believe hardcoding "Applications" will not work if the user's language setting is not English. For example in Norsk the "Applications" folder is named "Programmer".
The Apple document on internationalization is here. Starting on page 45 is a section on handling localized path names.
I believe that Mac OS X provides a default application mechanism, so that .txt will open in TextEdit.app or Emacs or GVim or whatever the user has specified. I couldn't find anything online however.
You could run following command from your application:
open <full path to text file>
This will open the text file in the default text editor. You can open any file type using open command.