how to release dlls?

Questions & Answers
1

Hi,

Now I’m making an USB-camera application. In this app, I use mydll for camera management.
mydll’s run() written in ‘C’ manages usb camera.
Actually it worked well, I confirmed camera capture window worked as the unity’s background task.
But when I restarted app with unity’s GUI editor, camera window didn’t start and only unity app worked. So this app only works well at first time. In this case, I have to restart unity program. And I confirmed that mydll was occupied even if I stopped my app in unity.

So I think I have to load dll modules dynamically for this problem. And I have to release them when app stops. Is it correct? Are there anyone help? please let me know…

[DllImport("mydll", CharSet = CharSet.Auto)]
private static extern int run();
private static Thread t;
// Use this for initialization
void Start () {
	t = new System.Threading.Thread(new System.Threading.ThreadStart(this.start));
	t.Start();
}
private void start()
{
	run(); //usb camera program
}
2

I implemented dynamic dll import script like below link. And I confirmed dll lock problem was resolved by FreeLibrary(handle) method. I can delete my dll while unity editor was runnning. This is checking for the lock problem.

But I’m still facing same problem about usb camera. For the first start-up, I succeed to run usb camera. but from next time camera doesn’t start-up.

http://blogs.msdn.com/b/jonathanswift/archive/2006/10/03/dynamically-calling-an-unmanaged-dll-from-.net-_2800_c_23002900_.aspx

Is my problem related to below?
http://forum.unity3d.com/threads/79587-DLL-Lock

Please let me know if you know something…