stringByAppendingPathComponent, hows it work?

Question

EDIT_v002

I have had a look at all the comments and I am starting to see what I should be doing. To that end I have modified my code (see below) I have changed new

Answer 1

You don't append the delimiter. You append the next path component (eg filename, dir, etc). This avoids you needing to know the delimiter for your particular system.

NSMutableString* mutablePath = [NSMutableString string];
NSString* fullPath = [rootPath stringByAppendingPathComponent:filename];

[mutablePath setString:fullPath]; // OK to setString: of Mutable with non-Mutable
[mutablePath appendString:someOtherString]; // This won't cause an exception

// Example to clarify on comments below
{
    // This will cause a compiler warning.
    // warning: incompatible Objective-C types assigning
    //    ‘struct NSString *’, expected ‘struct NSMutableString *’
    NSMutableString* ms = [@"FOO" stringByAppendingPathComponent:@"BAR"];
}

There is a fairly clear example in the documentation.