the call for a Vision Acquisition Express VI into a loop

Hello. I worked on a project for a while now, and I seem to come to a brick wall. I'm relatively new to IMAQ, but I think I understand some of them.

We will call our test user Bob.

Bob must be able to see what the camera sees, and when the camera focuses on a barcode, Bob must press a "Capture" button, which will be the last image of the continuous acquisition and use this image for reading codes bar and later analysis of the data.

Bob is however facing a problem. Its block diagram is implemented in two different ways, both giving the same result. (see attached photos). It is within a sequence structure, that is in turn inside a while loop, which can be exited at any time. To prevent an automatic bike in the great loop, the first image of the sequence above is a structure of the event that allows the process to continue when you press a button "New Capture". What is going on? The first time through the sequence, Bob gets good results. However, after the execution of all the while loop, the image of the camera, which should be displayed in harmony with what the camera sees up to the "Capture" button, is just a white background.

What could be the cause of the express VI do not qualify the second time through the loop and beyond?

Thanks in advance.

(EDIT 1: image of the façade was added after the problem occurred)

Still, this does not seem to solve the problem. A capture finished as determined in the Express VI is the only way I found to call the express VI an infinite number of times. It works for my case, so I'll close the debate.

Tags: NI Software

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