How create Invoke method for "IMAQ EXTRACT"?

[Iskander]

Hello all

Help me

I have LV7.1.1 and IMAQ Vision.

I use the function "IMAQ EXTRACT"

I created "Invoke method" for image but don't create the list of the "Which events".

Where can I find the explain how do this?

With respect

Aleksandr

[TiTou]

Hi,

I am not sure I understand what you are trying to do.. Could you give more more details of the functions you need and also post your VIs ?

[Iskander]

Hello TiTou

Thanks for the attention

I created a little project for USB-camera.

I want to extract part of image from image

I send part of this project.

Then i created "Invoke Node" for the image

After I created the control for the Which Events. I can created only Array. But I coudn't created the list.

I saw the examples. Theare is the list of the Events.

How can I create the list?

  Best regards

Aleksandr.

Excuse me for my English

[Torba]

Hello Aleksandr,

Thank you for contacting National Instruments.  I'm afraid that I am not following what you are trying to do.  It sounds like you are trying to create a list of events off of a node.  You mentioned that you saw the list in an example.  Which example is this, and where did you go to get it?  Can you attach the example?

Regards,

Mike T
National Instruments

[Iskander]

Hello

Excuse me

I have forgotten to attach the file.

Best regards

Aleksandr

[Torba]

Aleksandr,

I can now see the invoke node that you are referring to.  The default input for the Which Events property is an array.  You can also find help on how to use this property by opening the Context Help (ctrl-H) and putting your cursor over the Which Events property. 

You said that there was an example that uses a list instead of an array.  Are you referring to the list of commands that you see in the Context Help, or did you find an actual example that passes a list into this property instead of an array?  Can you attach that example if you have it?

Regards,

Mike T

National Instruments

[Iskander]

Hello Mike T

I have learn the example:Toolkits and modules/Vision/Functions/Extract Example

How was created the list (drow,...) of Which Events?

Best regards

Aleksandr

Thanks for the help and attentoin

[rpursley8]

If you look at the context help that pops up when you hover over the invoke mode, you will see that your array for Which Events should contain a single element with the value of 2 (Draw Event).

The coordinates returned from this should be the coordinates for the bounding rectangle of whatever ROI shape you have drawn (rectangle, polygon, circle, freehand).

[Iskander]

Hello
Thanks for the help
I will be study this exercise
Best regards
Aleksandr