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NSTask with non-ASCII paths
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NSTask with non-ASCII paths


  • Subject: NSTask with non-ASCII paths
  • From: Andrew Zamler-Carhart <email@hidden>
  • Date: Fri, 7 Jan 2005 23:45:12 +0000

Greetings,

I have a method that uses NSTask to wrap a command-line tool called sips (see sips --help for more info). Currently, it works great for most files. However, files with any non-ASCII characters in their paths cause this method to fail.

Here is the code that I am using. I need to be able to call -setCurrentDirectoryPath: and -setArguments: with strings that may contain foreign-language characters (Russian, Japanese, etc.)

- (int) performSipsTransformation: (NSMutableArray *) arguments {
NSString *parentPath = [absolutePath stringByDeletingLastPathComponent];
NSString *name = [absolutePath lastPathComponent];


        [arguments addObject: name];

        NSTask *sipsTask = [[[NSTask alloc] init] autorelease];
        [sipsTask setLaunchPath: @"/usr/bin/sips"];
        [sipsTask setCurrentDirectoryPath: parentPath];
        [sipsTask setArguments: arguments];
        [sipsTask launch];
        [sipsTask waitUntilExit];
        return [sipsTask terminationStatus];
}

When this path, everything works fine:

	/Users/kavasoft/Folder/foo.jpg

But these give errors ("Error modifying file"):

	/Users/kavasoft/Folder/фу.jpg
	/Users/kavasoft/Папка/foo.jpg
	/Users/kavasoft/ホールダー/foo.jpg

I have tried experimenting with the NSString method -fileSystemRepresentation, but it doesn't seem to help matters. I tried wrapping name and parentPath with this method:

- (NSString *) fileSystemRepresentation: (NSString *) value {
return [NSString stringWithCString: [value fileSystemRepresentation]];
}


The names get converted into a format like these, with each multi-byte unichar represented as several characters:

	/Users/kavasoft/Folder/—Ñ—É.jpg
	/Users/kavasoft/–ü–∞–ø–∫–∞/foo.jpg
	/Users/kavasoft/ホールダー/foo.jpg

But those don't work either.

Does anybody have any suggestions for how to convert non-ASCII paths so that NSTask and sips will communicate properly?

For what it's worth, I tried using NSTask to run ls, and it accepted the non-ASCII paths just fine. So I'm not sure how ls and sips are different in this regard.

Best regards,

Andrew
KavaSoft

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