VsTeXProject.VisualStudio.Project.ProjectNode.PackageSelectionData C# (CSharp) Метод

        private IntPtr PackageSelectionData(StringBuilder sb, bool addEndFormatDelimiter)
        {
            if (sb == null || sb.ToString().Length == 0 || ItemsDraggedOrCutOrCopied.Count == 0)
            {
                return IntPtr.Zero;
            }

            // Double null at end.
            if (addEndFormatDelimiter)
            {
                if (sb.ToString()[sb.Length - 1] != '\0')
                {
                    sb.Append('\0');
                }
            }

            // We request unmanaged permission to execute the below.
            new SecurityPermission(SecurityPermissionFlag.UnmanagedCode).Demand();

            var df = new _DROPFILES();
            var dwSize = Marshal.SizeOf(df);
            short wideChar = 0;
            var dwChar = Marshal.SizeOf(wideChar);
            var structSize = dwSize + (sb.Length + 1)*dwChar;
            var ptr = Marshal.AllocHGlobal(structSize);
            df.pFiles = dwSize;
            df.fWide = 1;
            var data = IntPtr.Zero;
            try
            {
                data = UnsafeNativeMethods.GlobalLock(ptr);
                Marshal.StructureToPtr(df, data, false);
                var strData = new IntPtr((long) data + dwSize);
                DragDropHelper.CopyStringToHGlobal(sb.ToString(), strData, structSize);
            }
            finally
            {
                if (data != IntPtr.Zero)
                    UnsafeNativeMethods.GlobalUnLock(data);
            }

            return ptr;
        }