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copied!<p>One way of doing this is indeed to use the accessibility APIs.</p> <p>An application I'm developing is doing just this to get the front window, the document path of the front window and many other attributes.</p> <p>The way I'm doing this is through AppleScript. It can be clumsy at times, but it seems to be fairly reliable. I use <a href="http://appscript.sourceforge.net/" rel="noreferrer">AppScript</a> to send AppleScript from within my Cocoa app. It's thread safe and more stable than the alternatives - either Scripting Bridge or NSAppleScript.</p> <p>The difficult bit will be identifying a window using it's window ID in AppleScript - AppleScript doesn't seem to have a window ID property that matches up to CGWindowID. However, you can get any window you want using AppleScript.</p> <ol> <li><p>Move frontmost window to 100, 100</p> <pre><code>tell application "System Events" set theprocess to the first process whose frontmost is true set thewindow to the value of attribute "AXFocusedWindow" of theprocess set position of thewindow to {100, 100} end tell </code></pre></li> <li><p>Resize frontmost window to 200, 300</p> <pre><code>tell application "System Events" set theprocess to the first process whose frontmost is true set thewindow to the value of attribute "AXFocusedWindow" of theprocess set size of thewindow to {200, 300} end tell </code></pre></li> <li><p>Change current window of the frontmost application</p> <pre><code>tell application "System Events" set theprocess to the first process whose frontmost is true set thewindow to the value of attribute "AXFocusedWindow" of theprocess set size of thewindow to {200, 300} windows of theprocess -- Code to get ID of window you want to activate tell window 2 of theprocess -- assuming it's window 2 perform action "AXRaise" end tell end tell </code></pre></li> <li><p>Window that's active</p> <pre><code>tell application "System Events" set theprocess to the first process whose frontmost is true set thewindow to the value of attribute "AXFocusedWindow" of theprocess end tell </code></pre></li> </ol> <p>There's an application available for AppScript called <a href="http://sourceforge.net/projects/appscript/files/ASTranslate/" rel="noreferrer">ASTranslate</a> that will turn this AppleScript into the Objective C code that calls the relevant commands in AppScript.</p> <p>For more information on how to get the size and bounds of windows (these are read only as far as I'm aware) see the <a href="http://developer.apple.com/mac/library/samplecode/SonOfGrab/index.html" rel="noreferrer">Son of Grab</a> sample application.</p>

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