C# (CSharp) IMoniker.NotNull示例

示例#1

文件： FilterGraphTools.cs 项目： imintsystems/Imint.Media.DirectShow

        public static IBaseFilter AddFilterByDevicePath(IGraphBuilder graphBuilder, string devicePath, string name)
        {
            int         hr     = 0;
            IBaseFilter filter = null;

#if USING_NET11
            UCOMIBindCtx bindCtx = null;
            UCOMIMoniker moniker = null;
#else
            IBindCtx bindCtx = null;
            IMoniker moniker = null;
#endif
            int eaten;

            if (graphBuilder.IsNull())
            {
                throw new ArgumentNullException("graphBuilder");
            }

            try
            {
                hr = NativeMethods.CreateBindCtx(0, out bindCtx);
                Marshal.ThrowExceptionForHR(hr);

                hr = NativeMethods.MkParseDisplayName(bindCtx, devicePath, out eaten, out moniker);
                Marshal.ThrowExceptionForHR(hr);

                hr = (graphBuilder as IFilterGraph2).AddSourceFilterForMoniker(moniker, bindCtx, name, out filter);
                DsError.ThrowExceptionForHR(hr);
            }
            catch
            {
                // An error occur. Just returning null...
            }
            finally
            {
                if (bindCtx.NotNull())
                {
                    Marshal.ReleaseComObject(bindCtx);
                }
                if (moniker.NotNull())
                {
                    Marshal.ReleaseComObject(moniker);
                }
            }

            return(filter);
        }