/// <summary>
/// This method gets a UCOMIMoniker object.
///
/// HACK: The only way to create a UCOMIMoniker from a moniker
/// string is to use UCOMIMoniker.ParseDisplayName(). So I
/// need ANY UCOMIMoniker object so that I can call
/// ParseDisplayName(). Does anyone have a better solution?
///
/// This assumes there is at least one video compressor filter
/// installed on the system.
/// </summary>
protected System.Runtime.InteropServices.ComTypes.IMoniker getAnyMoniker()
{
Guid category = FilterCategory.VideoCompressorCategory;
object comObj = null;
System.Runtime.InteropServices.ComTypes.IEnumMoniker enumMon = null;
try
{
// Get the system device enumerator
//Type srvType = Type.GetTypeFromCLSID(Clsid.SystemDeviceEnum);
//if (srvType == null)
// throw new NotImplementedException("System Device Enumerator");
//comObj = Activator.CreateInstance(srvType);
ICreateDevEnum enumDev = (ICreateDevEnum) new CreateDevEnum();
// Create an enumerator to find filters in category
int hr = enumDev.CreateClassEnumerator(category, out enumMon, 0);
//int hr = enumDev.CreateClassEnumerator(ref category, out enumMon, 0);
if (hr != 0)
{
throw new NotSupportedException("No devices of the category");
}
// Get first filter
IntPtr f = IntPtr.Zero;
var mon = new System.Runtime.InteropServices.ComTypes.IMoniker[1];
hr = enumMon.Next(1, mon, f);
if ((hr != 0))
{
mon[0] = null;
}
return(mon[0]);
}
finally
{
if (enumMon != null)
{
Marshal.ReleaseComObject(enumMon);
}
enumMon = null;
if (comObj != null)
{
Marshal.ReleaseComObject(comObj);
}
comObj = null;
}
}
public void Enum([In] int fForward, [MarshalAs(UnmanagedType.Interface)] out System.Runtime.InteropServices.ComTypes.IEnumMoniker ppenumMoniker)
{
throw new NotImplementedException();
}
/// <summary> Populate the InnerList with a list of filters from a particular category </summary>
protected static IEnumerable <Filter> getFilters(Guid category)
{
object comObj = null;
System.Runtime.InteropServices.ComTypes.IEnumMoniker enumMon = null;
var mon = new System.Runtime.InteropServices.ComTypes.IMoniker[1];
try
{
// Get the system device enumerator
//Type srvType = Type.GetTypeFromCLSID(Clsid.SystemDeviceEnum);
//if (srvType == null)
// throw new NotImplementedException("System Device Enumerator");
//comObj = Activator.CreateInstance(srvType);
ICreateDevEnum enumDev = (ICreateDevEnum) new CreateDevEnum();
// Create an enumerator to find filters in category
int hr = enumDev.CreateClassEnumerator(category, out enumMon, 0);
if (hr != 0)
{
throw new NotSupportedException("No devices of the category");
}
// Loop through the enumerator
IntPtr f = IntPtr.Zero;
do
{
// Next filter
hr = enumMon.Next(1, mon, f);
if ((hr != 0) || (mon[0] == null))
{
break;
}
// Add the filter
Filter filter = new Filter(mon[0]);
//InnerList.Add(filter);
yield return(filter);
// Release resources
Marshal.ReleaseComObject(mon[0]);
mon[0] = null;
}while (true);
// Sort
//InnerList.Sort();
}
finally
{
if (mon[0] != null)
{
Marshal.ReleaseComObject(mon[0]);
}
mon[0] = null;
if (enumMon != null)
{
Marshal.ReleaseComObject(enumMon);
}
enumMon = null;
if (comObj != null)
{
Marshal.ReleaseComObject(comObj);
}
comObj = null;
}
}
