UPnPDeviceFinder CreateAsyncFind

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Hi guys

I'm trying to work with UPnPLib 1.0 for a ControlPoint.
I call the UPnPDeviceFinder but the callback doesn't get called.

UPDATE: 10.11.2010
Now i have time to make some private work. I improved my code, but still no callback.

Please help me :)

namespace UPnPServices {
    public delegate void UPnPDeviceFinderDelegate(IUPnPDevice device, string udn, int id);

    public class UPnPControlPoint {
        #region Fields
        private UPnPDeviceFinderDelegate UPnPDeviceFinderCallback;

        private UPnPDeviceFinder _deviceFinder;
        #endregion

        public UPnPControlPoint() {
            UPnPDeviceFinderCallback = new UPnPDeviceFinderDelegate(UPnPDeviceFinderCalledback);

            if (_deviceFinder == null)
                _deviceFinder = new UPnPDeviceFinder();
        }

        public void FindDevice() {
            int finderResult = _deviceFinder.CreateAsyncFind("urn:schemas-upnp-org:device:MediaServer:1", 0, UPnPDeviceFinderCallback);
            Console.WriteLine("[UPnPControlPoint] StartAsyncFind");
            _deviceFinder.StartAsyncFind(finderResult);
        }

        public void UPnPDeviceFinderCalledback(IUPnPDevice device, string udn, int id) {
            Console.WriteLine("[UPnPControlPoint] UPnPDeviceFinderCalledback");
            switch (id) {
                case 0: //device added
                    Console.WriteLine("[UPnPControlPoint] UPnPDeviceFinderCalledback Device added: {0}", device.FriendlyName);
                    break;
                case 1: // device removed
                    Console.WriteLine("[UPnPControlPoint] UPnPDeviceFinderCalledback Device removed: {0}", udn);
                    break;
                case 2: // search completed
                    Console.WriteLine("[UPnPControlPoint] UPnPDeviceFinderCalledback Search Completed");
                    break;
                default:
                    Console.WriteLine("[UPnPControlPoint] UPnPDeviceFinderCalledback Default");
                    break;
            }
        }
    }
}

Posted 25-Sep-10 1:44am

mavarazo

Updated 10-Nov-10 9:30am

v3

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Abhishek Sur · Answer 1 · 2010-09-25T08:49:00

where is the call to

_deviceFinder.StartAsyncFind(finderResult);

This call will invoke the search.

So the complete code will look like :

C#

public delegate void UPnPDeviceFinderDelegate(IUPnPDevice device, string udn, int i);
private UPnPDeviceFinder _deviceFinder = new UPnPDeviceFinder();
int finderResult = _deviceFinder.CreateAsyncFind("urn:schemas-upnp-org:device:MediaServer:1", 0, UPnPDeviceFinderCallback
);
_deviceFinder.StartAsyncFind(finderResult);

After the StartAsyncFind is called the device would be searched based on deviceid specified as finderResult.

John Rehn · Answer 2 · 2015-11-01T04:59:00

Hi,
I stumbled over this problem myself. Could not get the delegate callback to work.

Try implementing a class with the IUPnPDeviceFinderCallback interface, and using that instead of a delegate. That worked for me! :)

C#

public class DeviceFinderCallback : IUPnPDeviceFinderCallback
{
	public void DeviceAdded(int lFindData, UPnPDevice pDevice)
	{
		// Do stuff
	}

	public void DeviceRemoved(int lFindData, string bstrUDN)
	{
		// Do stuff
	}

	public void SearchComplete(int lFindData)
	{
		// Do stuff
	}
}

C#

static void Main(string[] args)
{
	var finder = new UPnPDeviceFinder();
	int id = finder.CreateAsyncFind(
		"upnp:rootdevice", 0, new DeviceFinderCallback());
	finder.StartAsyncFind(id);
	Console.ReadLine();
}

UPnPDeviceFinder CreateAsyncFind

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