private void HookupGraphEventService(IFilterGraph pGraph)
{
object o;
int hr;
DirectShowLib.IServiceProvider spServiceProvider = (DirectShowLib.IServiceProvider)pGraph;
hr = spServiceProvider.QueryService(typeof(BroadcastEventService).GUID,
typeof(IBroadcastEventEx).GUID,
out o);
spBroadcastEvent = o as IBroadcastEventEx;
if (hr < 0 || spBroadcastEvent == null)
{
// Create the Broadcast Event Service object.
spBroadcastEvent = new BroadcastEventService() as IBroadcastEventEx;
IRegisterServiceProvider spRegService = (IRegisterServiceProvider)pGraph;
// Register the Broadcast Event Service object as a service.
hr = spRegService.RegisterService(
typeof(BroadcastEventService).GUID,
spBroadcastEvent);
}
DsError.ThrowExceptionForHR(hr);
}
private void RegisterService(IFilterGraph ifg)
{
int hr;
// Get the registration interface from the graph
IRegisterServiceProvider spRegService = ifg as IRegisterServiceProvider;
// Create the Broadcast Event Service object.
IBroadcastEvent spBroadcastEvent = new BroadcastEventService() as IBroadcastEvent;
try
{
// Register the Broadcast Event Service object as a service.
hr = spRegService.RegisterService(
SID_SBroadcastEventService,
spBroadcastEvent);
DsError.ThrowExceptionForHR(hr);
}
finally
{
Marshal.ReleaseComObject(spBroadcastEvent);
}
}