If you are using LabVIEW, debugging this is quite easy. Right click on the wire where you want to view the data and choose probe. It will not be a part of the dashboard, but will be displayed in the development environment.
The easiest way to do this for a dashboard is probably to take the standard image and apply the same image processing on the host computer. The built-in dashboard is able to transmit the data returned from the camera and nothing else.
Like Greg said, displaying images isn’t quite as simple in C++. The default dashboard only gets images directly from the camera. To send images, you’d need to create a network socket, send data to a laptop, and then use socket programming on the laptop to get the image back off the network. Then you’d need to find a way to display the image you just got.
I’d assume LabVIEW does the same thing, but it has all of this built in without you having to write custom code for it.