Pass unmanaged data around in managed code?

Question

I'm building a Windows Form application that controls 3D volume rendering using an ArrayFire array object. The array is unmanaged. In the form constructor, I load and render the volume.

I have a Trackbar that controls the opacity of the volume and a corresponding scroll event handler. However, I can't figure out how to pass the volume array to the Trackbar scroll event handler so I can re-render the volume.

I can't make the volume array an attribute of the Form because, apparently, managed classes cannot have unmanaged attributes.

What's the best way to do this?

Possible duplicate: http://stackoverflow.com/questions/6763703/passing-data-from-unmanaged-code-c-to-managed-code-c — Pavan Yalamanchili, Dec 13 '12 at 03:05

score 1 · Accepted Answer · answered Dec 13 '12 at 04:46

A managed class cannot have a field that is an unmanaged type, but it can have a field that is a pointer to an unmanaged type. Stick a * at the end of your unmanaged type, and you should be able to pass it to whatever methods you want, and store it wherever you want.

Pass unmanaged data around in managed code?

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