What to do with System.Runtime.InteropServices.COMException?

I am trying to write webapplication in C# for ATEM Mini using their SDK. Finally i can switch video output, but only 5 times. After that, this error was showed (attachment)

The code where this error is looks like that

Code: Select all

public AtemSwitcher()
        {
            IBMDSwitcherDiscovery discovery = new CBMDSwitcherDiscovery();

            // Connect to switcher
            discovery.ConnectTo("192.168.0.10", out IBMDSwitcher switcher, out _BMDSwitcherConnectToFailure failureReason);
            this.switcher = switcher;
            me0 = this.MixEffectBlocks.First();
        }


The problem is in discovery. Had someone same problem or can someone help me?

[Cameron Nichols]

Hi Tomas,

Each call to IBMDSwitcherDiscovery.ConnectTo will open a new connection with the output IBMDSwitcher object. When the IBMDSwitcher objected is released, then the connection will be closed.

The issue I can see is that in C# managed code, the RCW won't release the COM object straight away, and will only do so when the garbage collector cleans up all unreferenced objects. Because of this you may have exhausted the number of open connections.

To resolve, I suggest calling Marshal.FinalReleaseComObject on the IBMDSwitcher object once you have finished with the object to ensure that the RCW reference count is decremented.

https://learn.microsoft.com/en-us/dotne ... ew=net-7.0

Regards
Cameron

Hello Cameron,

thanks a lot for your answer!
It is what I thought. I already solved this problem.

Thanks a lot!

Tomas.