public static XmlDocument GetItems(IUPnPService svc, string containerID, string criteria, string filter, int startItem, int count)
{
XmlDocument doc = new XmlDocument();
object results;
object retVal;
int hr = svc.InvokeAction("Browse", new object[] { containerID, criteria, filter, startItem, count, "" }, out results, out retVal);
if (hr == 0)
{
doc.LoadXml(((object[])results)[0].ToString());
}
return(doc);
}
// Checks if device supports Content Directory service and opens a browser on it
private void BrowseDevice(IUPnPDevice device)
{
// Get service enumerator
IntPtr pE = device.Services._NewEnum;
IEnumUnknown pEnum = (IEnumUnknown)Marshal.GetObjectForIUnknown(pE);
Marshal.Release(pE);
// Enumerate services. Look for one that has ContentDirectory in its description
uint cItems;
IUPnPService svc = null;
IUPnPService svcContent = null;
bool couldBrowse = false;
while (pEnum.Next(1, out pE, out cItems) == 0 && cItems == 1)
{
svc = (IUPnPService)Marshal.GetObjectForIUnknown(pE);
Marshal.Release(pE);
object results;// = new object[3];
object retVal;
if (svc.ServiceTypeIdentifier.IndexOf("ContentDirectory", StringComparison.OrdinalIgnoreCase) >= 0)
{
// Check if the service supports Browse verb
// This is not really neccessary, but just a precaution
svcContent = svc;
int hr = svc.InvokeAction("Browse", new object[] { "0", "BrowseDirectChildren", "*", 0, 0, "" }, out results, out retVal);
if (hr == 0)
{
couldBrowse = true;
}
hr = 0;
}
}
if (!couldBrowse || svcContent == null)
{
MessageBox.Show("Found no browsable content");
}
else
{
// We have found the Content Directory
Browser browser = new Browser(svcContent);
browser.ShowDialog();
}
}
/// <summary>
/// Invokes an action.
/// </summary>
/// <param name="name">The name of the action.</param>
/// <param name="inParams">The in parameters for the action.</param>
/// <returns>An array of objects representing the out parameters for the action.</returns>
/// <exception cref="UPnPException"></exception>
/// <exception cref="MissingMethodException">Action not found or failed.</exception>
/// <exception cref="NotSupportedException">Underlying native service is null.</exception>
public object[] InvokeAction(string name, params object[] inParams)
{
try
{
if (msCOMService != null)
{
object[] laIn = inParams;
if (laIn == null)
{
laIn = new object[] { }
}
;
object loOut = null;
object loResult = msCOMService.InvokeAction(name, laIn, ref loOut);
if (loResult != null)
{
throw new MissingMethodException(
string.Format(
"({0}) => {1} failed with {2} result",
msCOMService.ServiceTypeIdentifier, name, loResult));
}
return((object[])loOut);
}
else
{
throw new NotSupportedException();
}
}
catch (COMException loE)
{
throw new UPnPException(loE);
}
}