public function ReportSearchReports($keyword, $target = false)
 {
     // $keyword       : string
     // $search_target : string ('received' or 'send' or 'draft' or 'all') default all
     $this->CheckAndSetHeader(__FUNCTION__);
     if ($target === false) {
         $target = "all";
     }
     $reg_args["target"] = $target;
     $reg_args["keyword"] = $keyword;
     $this->encodeString($reg_args);
     $results = parent::ReportSearchReports($reg_args);
     $this->methodClose();
     return $this->RetvalConvertArray($results->report);
 }