Drag&Drop NSURL without "file://" - objective-c

Question

I'm implementing my drag&drop method. I need that when user drags something on my app window I can get that file URL. NSURL needs to be converted to char. Thats OK. But how to remove file:// from url? My current code:
pboard = [sender draggingPasteboard];
NSString *url = [[NSURL URLFromPasteboard:pboard] absoluteString];
input_imageN = strdup([url UTF8String]);
its OK, but it gives url with file:// prefix. I tried using
NSURL *fileUrl = [[NSURL URLFromPasteboard:pboard] isFileURL];
NSString *url = [fileUrl absoluteString];
NSLog(#"url: %#", [NSURL URLFromPasteboard:pboard]);
input_imageN = strdup([url UTF8String]);
but it says that
Cannot initialize a variable of type 'NSURL *' with an rvalue of type 'BOOL' (aka 'signed char')
at
NSURL *fileUrl = [[NSURL URLFromPasteboard:pboard] isFileURL];

Answer 1

To go from a file URL to the path as a C string in the appropriate representation for the filesystem, you'd do:
NSURL *fileURL = [NSURL URLFromPasteboard: pboard];
NSString *filePath = [fileURL path];
char *filesystemRepresentation = [filePath filesystemRepresentation];
This avoids assumptions that stripping off the scheme leaves you with just the path, or that the filesystem is definitely happy accepting UTF8-encoded paths.

Answer 2

url = [url stringByReplacingOccurencesOfString:#"file://" withString:#""];
Hope this helps. Cheers!

Answer 3

#user23743's answer is correct. Since iOS 7 though NSURL has its own filestSystemRepresentation method.
In Swift:
if let fileURL = NSURL(fromPasteboard: pboard) {
let representation = fileURL.fileSystemRepresentation
}

Answer 4

if let fileURL = NSURL(from: pboard)?.filePathURL {
}
has been most effective for me.