Notes from Sand Hill
XTension Tech Notes
ID: TN.QuickCam |
Subject: Using the QuickCam with XTension
Applicability:All versions of XTension after 1.0
If you have a Mac with two serial ports, you can easily connect the Connectix QuickCam to one of them and control it from XTension. If you have a local network, the camera can be on a Mac which is remote to the Mac running XTension. With XTension, you can control any number of cameras. Any number of uses can be imagined, however you could start with: simple burglar pics watch your plants grow who came to your door ? babysitter monitor party pictures website images The following example is simple. It requires a QuickCam on one Mac, XTension running on another Mac, and that we have AppleTalk between them. In the simplest case, we want to take a picture whenever the motion sensor in the living room indicates movement. Obviously you might want to add some conditional logic which would prevent the snapshot when it was reasonable for someone to be in the area. We will assume that QuickPict is already running, as it would create a delay having to start it up, and we do want to be as prompt as possible. Also, for this example, we need to have Clip2Gif running in order to save the snapshot to disk as a GIF or JPEG file. Clip2Gif is a freeware app, and is available at: Yves Piguet's site The following script should be modified for your own location, but it is a good example from a working system: ------------------------------ --the LoginID portion of this script may not be necessary, -- it is supposed to circumvent the problem of 'signing on' set RemoteMachine to "LR Mac" set RemoteZone to "My Zone" set RemoteFinder to a reference to application "Finder" of machine RemoteMachine of zone RemoteZone set RemoteDisk to "thatDisk" set LoginID to login as "Michael" password "" tell application "QuickPICT" of machine RemoteMachine copy end tell set xFileTime to (time of (current date)) set xFileName to (RemoteDisk & ":Desktop Folder:LRmotion" & xFileTime) tell application "clip2gif" of machine remoteMachine activate save clipboard as GIF in a reference to file xFileName end tell write log "Snapshot taken in living room as : LRmotion" & xFileTime ------------------------------ Of course you need to change some names, and the script editor will let you know which ones! But this script will also write an entry to the log regarding the event and the name of the file saved. This is a simple example, and surely there is a way to do this generically, so that this could be a 'subroutine' which could be called from any of the sensors which were associated with cameras. Unless you have dozens, it is probably just as simple to copy this script and change the machine and sensor names accordingly. It is even possible that you can get some of the other QuickPict script verbs to work for you. And of course, there are other camera types and other capture programs which can be scripted in this same way. Consider here that there is a delay between the sensor trigger, and the actual picture capture time. You should perform an operational test for each sensor more than once. You may want to delay a period of time, or you may want to take a sequence of frames rather than a single clip.
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