public void AddFilter(FilterProps fp, Point?desired_pos) //create new IBaseFilter, add it to DS graph and this graph
{
Filter f;
try
{
f = new Filter(fp);
int hr = graphBuilder.AddFilter(f.BaseFilter, fp.Name);
DsError.ThrowExceptionForHR(hr);
}
catch (COMException e)
{
ShowCOMException(e, "Error creating filter " + fp.Name);
return;
}
catch (Exception e)
{
MessageBox.Show(e.Message, "Error adding filter");
return;
}
string srcfn = null, dstfn = null;
if ((f.BaseFilter as IFileSourceFilter) != null)
{
srcfn = f.ChooseSrcFileName();
}
if ((f.BaseFilter as IFileSinkFilter) != null)
{
dstfn = f.ChooseDstFileName();
}
AddFilterHere(f, true, desired_pos);
history.AddFilter(fp, f.Name, srcfn, dstfn, f);
}