static int backupTestCmd(
            ClientData clientData,
            Tcl_Interp interp,
            int objc,
            Tcl_Obj[] objv
            )
        {
            BackupSubCommand[] aSub = new BackupSubCommand[] {
                new BackupSubCommand("step", BackupSubCommandEnum.BACKUP_STEP, 1, "npage"),
                new BackupSubCommand("finish", BackupSubCommandEnum.BACKUP_FINISH, 0, ""),
                new BackupSubCommand("remaining", BackupSubCommandEnum.BACKUP_REMAINING, 0, ""),
                new BackupSubCommand("pagecount", BackupSubCommandEnum.BACKUP_PAGECOUNT, 0, ""),
                new BackupSubCommand(null, 0, 0, null)
            };

            sqlite3_backup p    = (sqlite3_backup)clientData;
            int            iCmd = 0;
            int            rc;

            rc = Tcl_GetIndexFromObjStruct(
                interp, objv[1], aSub, aSub.Length, "option", 0, ref iCmd
                );
            if (rc != TCL.TCL_OK)
            {
                return(rc);
            }
            if (objc != (2 + aSub[iCmd].nArg))
            {
                TCL.Tcl_WrongNumArgs(interp, 2, objv, aSub[iCmd].zArg);
                return(TCL.TCL_ERROR);
            }

            switch (aSub[iCmd].eCmd)
            {
            case BackupSubCommandEnum.BACKUP_FINISH:
            {
                string         zCmdName;
                WrappedCommand cmdInfo = null;
                zCmdName = TCL.Tcl_GetString(objv[0]);
                TCL.Tcl_GetCommandInfo(interp, zCmdName, ref cmdInfo);
                cmdInfo.deleteProc = null;
                TCL.Tcl_SetCommandInfo(interp, zCmdName, cmdInfo);
                TCL.Tcl_DeleteCommand(interp, zCmdName);

                rc = sqlite3_backup_finish(p);
                TCL.Tcl_SetResult(interp, sqlite3TestErrorName(rc), TCL.TCL_STATIC);
                break;
            }

            case BackupSubCommandEnum.BACKUP_STEP:
            {
                int nPage = 0;
                if (TCL.Tcl_GetIntFromObj(interp, objv[2], ref nPage))
                {
                    return(TCL.TCL_ERROR);
                }
                rc = sqlite3_backup_step(p, nPage);
                TCL.Tcl_SetResult(interp, sqlite3TestErrorName(rc), TCL.TCL_STATIC);
                break;
            }

            case BackupSubCommandEnum.BACKUP_REMAINING:
                TCL.Tcl_SetObjResult(interp, TCL.Tcl_NewIntObj(sqlite3_backup_remaining(p)));
                break;

            case BackupSubCommandEnum.BACKUP_PAGECOUNT:
                TCL.Tcl_SetObjResult(interp, TCL.Tcl_NewIntObj(sqlite3_backup_pagecount(p)));
                break;
            }

            return(TCL.TCL_OK);
        }