title: objective c,checking file exist at path
body: <p>I have created a screen using Objective-C in an iPhone project. In that, there are 2 buttons (say A and B). On the click of button A, one xml file will be created in a folder (say INBOX).</p>
  
  <p>My problem is, I need to create the file only if it does not exist at folder INBOX.
  How can I do this? Can any one tell me the syntax?</p>