There is a public variable holding this information:

1.   /**
2.    * Current platform in use, one of the
3.    * PConstants WINDOWS, MACOSX, MACOS9, LINUX or OTHER.
4.    */
5.   static public int platform;

But Java's file path handling is already system-agnostic, if you use it correctly.

Hi, phi.lho

I was doing it like:

1. String OSname = System.getProperty("os.name");
   
2. if (OSname.equals("Mac OS X")) { ... }

How can one check the platform constant?

Actually, Processing is doing it in a similar (but more robust) way:

1.     String osname = System.getProperty("os.name");
2.     if (osname.indexOf("Mac") != -1) {
3.       platform = MACOSX;
4.     } else if (osname.indexOf("Windows") != -1) {
5.       platform = WINDOWS;
6.     } else if (osname.equals("Linux")) {  // true for the ibm vm
7.       platform = LINUX;
8.     } else {
9.       platform = OTHER;
10.     }

These constants are integers, so you just check them with switch or if platform == XXX