/// <summary>
/// Scans a filter's pins looking for a pin with the specified connection status
/// </summary>
/// <param name="vSource">The filter to scan</param>
/// <param name="vStat">The status to find (connected/unconnected)</param>
/// <param name="iIndex">Zero based index (ie 2 will return the third pin with the specified status)</param>
/// <returns>The matching pin, or null if not found</returns>
public static IPin ByConnectionStatus(IBaseFilter vSource, PinConnectedStatus vStat, int iIndex)
{
int hr;
IEnumPins ppEnum;
IPin pRet = null;
IPin pOutPin;
IPin[] pPins = new IPin[1];
if (vSource == null)
{
return(null);
}
// Get the pin enumerator
hr = vSource.EnumPins(out ppEnum);
DsError.ThrowExceptionForHR(hr);
try
{
// Walk the pins looking for a match
int fetched;
while (ppEnum.Next(1, pPins, out fetched) >= 0 && fetched == 1)
{
// Read the connected status
hr = pPins[0].ConnectedTo(out pOutPin);
// Check for VFW_E_NOT_CONNECTED. Anything else is bad.
if (hr != DsResults.E_NotConnected)
{
DsError.ThrowExceptionForHR(hr);
// The ConnectedTo call succeeded, release the interface
DsUtils.ReleaseComObject(pOutPin);
}
// Is it the right status?
if ((hr == 0 && vStat == PinConnectedStatus.Connected) ||
(hr == DsResults.E_NotConnected && vStat == PinConnectedStatus.Unconnected))
{
// Is is the right index?
if (iIndex == 0)
{
pRet = pPins[0];
break;
}
iIndex--;
}
DsUtils.ReleaseComObject(pPins[0]);
}
}
finally
{
DsUtils.ReleaseComObject(ppEnum);
}
return(pRet);
}
public static IPin ByConnectionStatus(IBaseFilter vSource, PinConnectedStatus vStat, int iIndex)
{
IEnumPins pins;
IPin[] ppPins = new IPin[1];
if (vSource == null)
{
return(null);
}
DsError.ThrowExceptionForHR(vSource.EnumPins(out pins));
try
{
while (pins.Next(1, ppPins, IntPtr.Zero) == 0)
{
IPin pin2;
int hr = ppPins[0].ConnectedTo(out pin2);
if (hr != -2147220983)
{
DsError.ThrowExceptionForHR(hr);
Marshal.ReleaseComObject(pin2);
}
if (((hr == 0) && (vStat == PinConnectedStatus.Connected)) || ((hr == -2147220983) && (vStat == PinConnectedStatus.Unconnected)))
{
if (iIndex == 0)
{
return(ppPins[0]);
}
iIndex--;
}
Marshal.ReleaseComObject(ppPins[0]);
}
}
finally
{
Marshal.ReleaseComObject(pins);
}
return(null);
}
