Window snapping Cocoa application for Mac OS X

It appears to me that there currently exists no application for OS X that enables window snapping, as seen in some distributions of Linux or like allSnap does for Windows. Therefore, I have been thinking of creating such a cocoa application in Objective-C.

I am thinking of somehow getting a list of all currently open applications, and then using an NSDistantObject call to every one of them, fetching their window details (frame origin, height, width etc).
Then, have a listener for when a window is moved (listening for NSWindowDidMoveNotification or something) or if its dimensions change. Afterwards, somehow have the snapping program set the height and width of the window (setFrameOrigin if the window is dragged) that is changing accordingly whenever it is say 5px away from the border of another window.

It is currently just a vague idea. Any thoughts that might make this idea more realistic/concrete, or a link to an existing window snapping application for OS X, would be much appreciated.

Well, this might get you going...

http://bbs.applescript.net/viewtopic.php?pid=49916

That's doing tiling for the front most app, without the snapping but it's a way to play around with placement.

I don't exactly understand what you need to do, but Grab will allow you to capture a window, its located in Applications/Utilities/

I'm basically trying to create an Objective-C application that does what allSnap does for Windows. I think the way OS X handles applications and windows, and the fact that it is not open source, makes this more complex to achieve than other operating systems.

OK, I think I get what you're trying to do now. Things like NSWindowDidMoveNotification will only give you information about your windows, not those of other applications. Generally messing with other programs windows is very difficult or impossible.