USBCamera won't disconnect from camera for GRIP to run

[robert1356]

I'm wanting to write the following code for our robot code:

Startup:
- create USBCamera object
- set the brightness and exposure from stored preferences
- disconnect from camera
- run GRIP

Currently when I try this, GRIP says that the frame grabber could not connect to the camera.

Here's what I know so far:

- I have created my own USBCamera class that is an exact copy of the WPI lib version, but gives me the ability to set the exposure with better control
- The constructor for USBCamera calls openCamera() which calls NIVision.IMAQdxOpenCamera()
- The USBCamera method closeCamera() calls NIVision.IMAQdxCloseCamera
- I do not use the autocpature feature, I call getImage() and push that to the CameraServer object so startCapture() is never called.

I assumed that NIVision.IMAQdxCloseCamera() would close the connection to the camera, but that does not seem to be the case. I am calling that and then trying to start GRIP and grip fails connecting to the frame grabber for cam0 (the same camera I just used in USBCamera).

Does anyone have any idea how to do this? Any idea why calling USBCamera.closeCamera() does not disconnect from the camera object?

Thanks in advance