Hi everyone, I have a problem about reference of IMAQdx Open camera.vi. In my system, I used to low level functions to grab and obtain images. I shared the system that is like my system.Firstly, we need to select camera name by reference, while system is running.My system is directly running when VI opened, and I take an error. This error is about choosing the reference of IMAQdx Open camera.vi, this is normal. I want to fix this problem. There is no problem with camera, everything is OK,I obtain images and system has very good performance when I choose reference. When I used to event structure for reference of IMAQdx Open Camera.vi, the system was working (There is no error). But this is not enough for me, I want to use event structure in while loop. By using while loop in system, I want to change my reference of IMAQdx Open Camera.vi for many times while the Labview execution system is running. I designed this system, labview was working but I did'nt observe image. How can I fix this problem ? Could you help me,please?

@prettywoman wrote: @cbutcher wrote: If I understand your question correctly, you can do the following: Use a shift register for the camera reference Use a value change event for the Camera name to close the current camera open a new camera configure grab Use the timeout case with a timeout of 0 to "IMAQdx Grab2.vi" as in your current loop I don't understand where is exactly 'IMAQdx Grab2.vi' in this example. Please, tell me again detail. In this example, Closing %f is equal to Close IMAQdx Camera.vi and Opening %f is equal to Open IMAQdx Camera.vi. Did I understand this correctly? Can you give me more details about above example? I want to 'Camera Name' to put into a event structure, and this event structure into a while loop. I want to this because I should change my 'Camera Name' in this system when I want. When I used event structure without using while loop, 'Camera Name' is changing only once. When I used event structure with using while loop, I don't capture image. (I created 'False' constant to while loop condition to change 'Camera Name' of this system everytime.) My problem: When this happens, I don't capture image from my system but it gives me no error. I want to capture images while this system is running. Thank you very much 🙂 Hopefully now that the snippet version issue is solved by crossrulz you can see all the cases. Yes, the Timeout case contains the Grab2.vi (at least in the real case, the example has no IMAQdx code).

LabVIEW

event structure with low level grab

Solved!

Author

@crossrulz wrote:

@prettywoman wrote:
My Labview is 2014 Base Development Package.

That is your problem. The snippet was made in LabVIEW ~~2015~~ 2019 (I just tried to open it myself with LabVIEW 2016). I saved the VI for 2014. So give it a try.

Thank you very much 🙂