Error "requested attribute is not valid.

I'm looking to get a program (and ultimately define) attributes camera with CVI. I can get the values attribute, such as ROI_WIDTH to the imgGetAttribute function, but not all and not that I really need access, which are 'Exposure time' and 'Gain value'. I can see and set the exposure time and acquire the value of the attributes of camera in MAX. However, when I try to use the function imgGetCameraAttributeString in IMAQ for these attributes, I get the error "the requested attribute is not valid. My camera is the Basler acA2040 - 180km. In all other respects - alignment, etc. the camera grabbing interface, works great.

I don't see what I am doing wrong or miss this piece, but it's obviously something. I took the example of OR 'Attributes analog' as a point of departure, but that generates the same mistakes. How MAX can handle these attributes of the camera, but I can't in CVI? Is there some piece of missing configuration?

I'm a little new to this environment, but would appreciate a lot of help, someone has.

Thanks in advance,

Wayne Showalter

Hi Wayne,

IMAQ differerentiates in the behavior and the API regarding the "IMAQ attributes" (defined by the IMAQ driver) and 'Camera' (defined in the file of the camera). All those with fixed constants (such as ROI_WIDTH) are attributes IMAQ while those who precisely to put something in the camera picture is of the attributes of the camera. You will need to use the API to Get/SetCameraAttribute for those. There are different functions of string vs. numeric attributes. I suspect that if you call it with imgSetCameraAttributeNumeric() it will work.

Eric

Tags: NI Hardware

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