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namespace dshow
{
using System;
using System.Runtime.InteropServices;
using dshow.Core;
/// <summary>
/// Summary description for Filter.
/// </summary>
public class Filter : IComparable
{
// Device name
public readonly string Name;
// Moniker string
public readonly string MonikerString;
// Create new filter from moneker`s string
public Filter(string monikerString)
{
MonikerString = monikerString;
Name = GetName(monikerString);
}
// Create new filter from it's Moniker
internal Filter(UCOMIMoniker moniker)
{
MonikerString = GetMonikerString(moniker);
Name = GetName(moniker);
}
// Get moniker string of the moniker
private string GetMonikerString(UCOMIMoniker moniker)
{
string str;
moniker.GetDisplayName(null, null, out str);
return str;
}
// Get filter name represented by the moniker
private string GetName(UCOMIMoniker moniker)
{
Object bagObj = null;
IPropertyBag bag = null;
try
{
Guid bagId = typeof(IPropertyBag).GUID;
// get property bag of the moniker
moniker.BindToStorage(null, null, ref bagId, out bagObj);
bag = (IPropertyBag) bagObj;
// read FriendlyName
object val = "";
int hr = bag.Read("FriendlyName", ref val, IntPtr.Zero);
if (hr != 0)
Marshal.ThrowExceptionForHR(hr);
// get it as string
string ret = val as string;
if ((ret == null) || (ret.Length < 1))
throw new ApplicationException();
return ret;
}
catch (Exception)
{
return "";
}
finally
{
// release all COM objects
bag = null;
if (bagObj != null)
{
Marshal.ReleaseComObject(bagObj);
bagObj = null;
}
}
}
// Get filter name represented by the moniker string
private string GetName(string monikerString)
{
UCOMIBindCtx bindCtx = null;
UCOMIMoniker moniker = null;
String name = "";
int n = 0;
// create bind context
if (Win32.CreateBindCtx(0, out bindCtx) == 0)
{
// convert moniker`s string to a moniker
if (Win32.MkParseDisplayName(bindCtx, monikerString, ref n, out moniker) == 0)
{
// get device name
name = GetName(moniker);
Marshal.ReleaseComObject(moniker);
moniker = null;
}
Marshal.ReleaseComObject(bindCtx);
bindCtx = null;
}
return name;
}
// Compares objects of the type
public int CompareTo(object obj)
{
if (obj == null)
return 1;
Filter f = (Filter) obj;
return (this.Name.CompareTo(f.Name));
}
}
}
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