Let’s see some useful method about NSURL

Return the name of a file (with or without extension) from NSURLRequest:

getFilenameFromRequest
Objective-C
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- (NSString *)getFilenameFromRequest:(NSURLRequest *)request avoidExtension:(BOOL)avoidExtension
{
  NSString *filePath = [[[request URL] path] lastPathComponent];
    if (avoidExtension) {
      NSArray *a = [filePath componentsSeparatedByString:@"."];
      return [a objectAtIndex:0];
    }
  return filePath;
}

Return the file extension from NSURLRequest:

getExtensionFromRequest
Objective-C
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- (NSString *)getExtensionFromRequest:(NSURLRequest *)request
{
  NSString *filePath = [[[request URL] path] lastPathComponent];
  NSArray *a = [filePath componentsSeparatedByString:@"."];
  return [a objectAtIndex:1];
}

Finally, How to convert an address from NSString to NSURL and vice versa:

NSString to NSURL
Objective-C
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// filename
NSString *filePath = @"/path/filetext.txt";
 
// NSString to NSURL
NSURL *fileURL = [[NSURL alloc] initFileURLWithPath: filePath]; // do release
 
// or
NSURL fileURL = [NSURL fileURLWithPath: filePath]; // autorelease
 
// NSURL to NSString
NSString *filePath = [fileUrl absoluteString];