IMAQdx Open camera.vi Vs IMAQdx snap.vi enquiry

Hi,
I have an application for image aquisition and processing. initially it was set to IMAQdx snap.vi followed by IMAQdx Open camera.vi in a loop, since the application required minimum time consuming for image capturing and processing, so I put IMAQdx open camera.vi in outside of the loop, leave IMAQdx snap.vi only in the loop, it means whenever program run, open camera runs one time only, IMAQdx open camera.vi session out wired to IMAQdx snap.vi in the loop, but it was found error pop up when program runs to IMAQdx snap.vi, it shows err occured at IMAQdx Open Camera.vi. reason is camera already in use.
Question: 1. I have IMAQ open camera in outside of loop and transfer the session out to IMAQdx snap.vi, IMAQdx 
                   snap.vi should run directly, why it still execute IMAQdx open camera.vi again?
               2. right now I don't have IMAQdx close camera.vi in the program and I will add in later, when program
                   runs to the step of IMAQ open camera.vi, error out shows Ok and no error. so the problem is not due to
                   program without IMAQdx close camera, right?
Pls advice. attached is the error msg. thanks
suanleba
Attachments:
shows camera in use when IMAQdx snap run.JPG ‏98 KB

If you look at "IMAQdx Snap.vi"'s diagram, you'll see it works the following way :
 - if you do not provide a Session in, it will call IMAQdx Open on cam0 and then, after acquiring an image, will call IMAQdx Close
 - if you provide a Session In, it will just acquire an image, the camera session will not be closed.
As you are in the second case, your session id is still valid and you should not call IMAQ Camera Open in the loop.
Anyway, calling IMAQ Snap is not the most efficient solution. You should consider using either IMAQ Grab or low level VIs instead.
Sami Fathallah
ALLIANCE VISION
http://www.alliancevision.com
Sami Fathallah
ALLIANCE VISION
HW and SW Components for Scientific Imaging and Machine Vision
http://www.alliancevision.com

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