How to write/read data in NSPasteboard?

How to write data (image files type like .g开发者_如何学编程if, .jpg, .tiff, etc) to NSPasteboard? And how to extract data from NSPasteboard?

Simply as that, start here: http://developer.apple.com/library/mac/#documentation/Cocoa/Conceptual/PasteboardGuide106/Introduction/Introduction.html%23//apple_ref/doc/uid/TP40008099