public function print_grades()
 {
     global $CFG;
     $export_tracking = $this->track_exports();
     $strgrades = get_string('grades');
     switch ($this->separator) {
         case 'comma':
             $separator = ",";
             break;
         case 'tab':
         default:
             $separator = "\t";
     }
     /// Print header to force download
     if (strpos($CFG->wwwroot, 'https://') === 0) {
         //https sites - watch out for IE! KB812935 and KB316431
         @header('Cache-Control: max-age=10');
         @header('Expires: ' . gmdate('D, d M Y H:i:s', 0) . ' GMT');
         @header('Pragma: ');
     } else {
         //normal http - prevent caching at all cost
         @header('Cache-Control: private, must-revalidate, pre-check=0, post-check=0, max-age=0');
         @header('Expires: ' . gmdate('D, d M Y H:i:s', 0) . ' GMT');
         @header('Pragma: no-cache');
     }
     header("Content-Type: application/download\n");
     $downloadfilename = clean_filename("{$this->course->shortname} {$strgrades}");
     header("Content-Disposition: attachment; filename=\"{$downloadfilename}.txt\"");
     /// Print names of all the fields
     echo get_string("firstname") . $separator . get_string("lastname") . $separator . get_string("idnumber") . $separator . get_string("institution") . $separator . get_string("department") . $separator . get_string("email");
     foreach ($this->columns as $grade_item) {
         echo $separator . $this->format_column_name($grade_item);
         /// add a feedback column
         if ($this->export_feedback) {
             echo $separator . $this->format_column_name($grade_item, true);
         }
     }
     echo "\n";
     /// Print all the lines of data.
     $geub = new grade_export_update_buffer();
     $gui = new graded_users_iterator($this->course, $this->columns, $this->groupid);
     $gui->init();
     while ($userdata = $gui->next_user()) {
         $user = $userdata->user;
         echo $user->firstname . $separator . $user->lastname . $separator . $user->idnumber . $separator . $user->institution . $separator . $user->department . $separator . $user->email;
         foreach ($userdata->grades as $itemid => $grade) {
             if ($export_tracking) {
                 $status = $geub->track($grade);
             }
             echo $separator . $this->format_grade($grade);
             if ($this->export_feedback) {
                 echo $separator . $this->format_feedback($userdata->feedbacks[$itemid]);
             }
         }
         echo "\n";
     }
     $gui->close();
     $geub->close();
     exit;
 }

 public function print_grades()
 {
     global $CFG;
     $export_tracking = $this->track_exports();
     $strgrades = get_string('grades');
     $profilefields = grade_helper::get_user_profile_fields($this->course->id, $this->usercustomfields);
     $shortname = format_string($this->course->shortname, true, array('context' => context_course::instance($this->course->id)));
     $downloadfilename = clean_filename("{$shortname} {$strgrades}");
     $csvexport = new csv_export_writer($this->separator);
     $csvexport->set_filename($downloadfilename);
     // Print names of all the fields
     $exporttitle = array();
     foreach ($profilefields as $field) {
         $exporttitle[] = $field->fullname;
     }
     if (!$this->onlyactive) {
         $exporttitle[] = get_string("suspended");
     }
     // Add a feedback column.
     foreach ($this->columns as $grade_item) {
         $exporttitle[] = $this->format_column_name($grade_item);
         if ($this->export_feedback) {
             $exporttitle[] = $this->format_column_name($grade_item, true);
         }
     }
     $csvexport->add_data($exporttitle);
     // Print all the lines of data.
     $geub = new grade_export_update_buffer();
     $gui = new graded_users_iterator($this->course, $this->columns, $this->groupid);
     $gui->require_active_enrolment($this->onlyactive);
     $gui->allow_user_custom_fields($this->usercustomfields);
     $gui->init();
     while ($userdata = $gui->next_user()) {
         $exportdata = array();
         $user = $userdata->user;
         foreach ($profilefields as $field) {
             $fieldvalue = grade_helper::get_user_field_value($user, $field);
             $exportdata[] = $fieldvalue;
         }
         if (!$this->onlyactive) {
             $issuspended = $user->suspendedenrolment ? get_string('yes') : '';
             $exportdata[] = $issuspended;
         }
         foreach ($userdata->grades as $itemid => $grade) {
             if ($export_tracking) {
                 $status = $geub->track($grade);
             }
             $exportdata[] = $this->format_grade($grade);
             if ($this->export_feedback) {
                 $exportdata[] = $this->format_feedback($userdata->feedbacks[$itemid]);
             }
         }
         $csvexport->add_data($exportdata);
     }
     $gui->close();
     $geub->close();
     $csvexport->download_file();
     exit;
 }

 /**
  * Get the report data
  * @param  stdClass $course  course object
  * @param  stdClass $context context object
  * @param  stdClass $user    user object (it can be null for all the users)
  * @param  int $userid       the user to retrieve data from, 0 for all
  * @param  int $groupid      the group id to filter
  * @param  bool $tabledata   whether to get the table data (true) or the gradeitemdata
  * @return array data and possible warnings
  * @since  Moodle 3.2
  */
 protected static function get_report_data($course, $context, $user, $userid, $groupid, $tabledata = true)
 {
     global $CFG;
     $warnings = array();
     // Require files here to save some memory in case validation fails.
     require_once $CFG->dirroot . '/group/lib.php';
     require_once $CFG->libdir . '/gradelib.php';
     require_once $CFG->dirroot . '/grade/lib.php';
     require_once $CFG->dirroot . '/grade/report/user/lib.php';
     // Force regrade to update items marked as 'needupdate'.
     grade_regrade_final_grades($course->id);
     $gpr = new grade_plugin_return(array('type' => 'report', 'plugin' => 'user', 'courseid' => $course->id, 'userid' => $userid));
     $reportdata = array();
     // Just one user.
     if ($user) {
         $report = new grade_report_user($course->id, $gpr, $context, $userid);
         $report->fill_table();
         $gradeuserdata = array('courseid' => $course->id, 'userid' => $user->id, 'userfullname' => fullname($user), 'maxdepth' => $report->maxdepth);
         if ($tabledata) {
             $gradeuserdata['tabledata'] = $report->tabledata;
         } else {
             $gradeuserdata['gradeitems'] = $report->gradeitemsdata;
         }
         $reportdata[] = $gradeuserdata;
     } else {
         $defaultgradeshowactiveenrol = !empty($CFG->grade_report_showonlyactiveenrol);
         $showonlyactiveenrol = get_user_preferences('grade_report_showonlyactiveenrol', $defaultgradeshowactiveenrol);
         $showonlyactiveenrol = $showonlyactiveenrol || !has_capability('moodle/course:viewsuspendedusers', $context);
         $gui = new graded_users_iterator($course, null, $groupid);
         $gui->require_active_enrolment($showonlyactiveenrol);
         $gui->init();
         while ($userdata = $gui->next_user()) {
             $currentuser = $userdata->user;
             $report = new grade_report_user($course->id, $gpr, $context, $currentuser->id);
             $report->fill_table();
             $gradeuserdata = array('courseid' => $course->id, 'userid' => $currentuser->id, 'userfullname' => fullname($currentuser), 'maxdepth' => $report->maxdepth);
             if ($tabledata) {
                 $gradeuserdata['tabledata'] = $report->tabledata;
             } else {
                 $gradeuserdata['gradeitems'] = $report->gradeitemsdata;
             }
             $reportdata[] = $gradeuserdata;
         }
         $gui->close();
     }
     return array($reportdata, $warnings);
 }

 /**
  * To be implemented by child classes
  * @param boolean $feedback
  * @param boolean $publish Whether to output directly, or send as a file
  * @return string
  */
 public function print_grades($feedback = false)
 {
     global $CFG;
     require_once $CFG->libdir . '/filelib.php';
     $export_tracking = $this->track_exports();
     $strgrades = get_string('grades');
     /// Calculate file name
     $shortname = format_string($this->course->shortname, true, array('context' => context_course::instance($this->course->id)));
     $downloadfilename = clean_filename("{$shortname} {$strgrades}.xml");
     make_temp_directory('gradeexport');
     $tempfilename = $CFG->tempdir . '/gradeexport/' . md5(sesskey() . microtime() . $downloadfilename);
     if (!($handle = fopen($tempfilename, 'w+b'))) {
         print_error('cannotcreatetempdir');
     }
     /// time stamp to ensure uniqueness of batch export
     fwrite($handle, '<results batch="xml_export_' . time() . '">' . "\n");
     $export_buffer = array();
     $geub = new grade_export_update_buffer();
     $gui = new graded_users_iterator($this->course, $this->columns, $this->groupid);
     $gui->require_active_enrolment($this->onlyactive);
     $gui->init();
     while ($userdata = $gui->next_user()) {
         $user = $userdata->user;
         if (empty($user->idnumber)) {
             //id number must exist otherwise we cant match up students when importing
             continue;
         }
         // studentgrades[] index should match with corresponding $index
         foreach ($userdata->grades as $itemid => $grade) {
             $grade_item = $this->grade_items[$itemid];
             $grade->grade_item =& $grade_item;
             $gradestr = $this->format_grade($grade, $this->displaytype);
             // no formating for now
             // MDL-11669, skip exported grades or bad grades (if setting says so)
             if ($export_tracking) {
                 $status = $geub->track($grade);
                 if ($this->updatedgradesonly && ($status == 'nochange' || $status == 'unknown')) {
                     continue;
                 }
             }
             fwrite($handle, "\t<result>\n");
             if ($export_tracking) {
                 fwrite($handle, "\t\t<state>{$status}</state>\n");
             }
             // only need id number
             fwrite($handle, "\t\t<assignment>{$grade_item->idnumber}</assignment>\n");
             // this column should be customizable to use either student id, idnumber, uesrname or email.
             fwrite($handle, "\t\t<student>{$user->idnumber}</student>\n");
             fwrite($handle, "\t\t<score>{$gradestr}</score>\n");
             if ($this->export_feedback) {
                 $feedbackstr = $this->format_feedback($userdata->feedbacks[$itemid]);
                 fwrite($handle, "\t\t<feedback>{$feedbackstr}</feedback>\n");
             }
             fwrite($handle, "\t</result>\n");
         }
     }
     fwrite($handle, "</results>");
     fclose($handle);
     $gui->close();
     $geub->close();
     if (defined('BEHAT_SITE_RUNNING')) {
         // If behat is running, we cannot test the output if we force a file download.
         include $tempfilename;
     } else {
         @header("Content-type: text/xml; charset=UTF-8");
         send_temp_file($tempfilename, $downloadfilename, false);
     }
 }

 /**
  * To be implemented by child classes
  * @param boolean $feedback
  * @param boolean $publish Whether to output directly, or send as a file
  * @return string
  */
 function print_grades($feedback = false)
 {
     global $CFG;
     require_once $CFG->libdir . '/filelib.php';
     $export_tracking = $this->track_exports();
     $strgrades = get_string('grades');
     /// Calculate file name
     $downloadfilename = clean_filename("{$this->course->shortname} {$strgrades}.xml");
     make_upload_directory('temp/gradeexport', false);
     $tempfilename = $CFG->dataroot . '/temp/gradeexport/' . md5(sesskey() . microtime() . $downloadfilename);
     if (!($handle = fopen($tempfilename, 'w+b'))) {
         error("Could not create a temporary file into which to dump the XML data.");
         return false;
     }
     /// time stamp to ensure uniqueness of batch export
     fwrite($handle, '<results batch="xml_export_' . time() . '">' . "\n");
     $export_buffer = array();
     $geub = new grade_export_update_buffer();
     $gui = new graded_users_iterator($this->course, $this->columns, $this->groupid);
     $gui->init();
     while ($userdata = $gui->next_user()) {
         $user = $userdata->user;
         if (empty($user->idnumber)) {
             //id number must exist
             continue;
         }
         // studentgrades[] index should match with corresponding $index
         foreach ($userdata->grades as $itemid => $grade) {
             $grade_item = $this->grade_items[$itemid];
             $grade->grade_item =& $grade_item;
             $gradestr = $this->format_grade($grade);
             // no formating for now
             // MDL-11669, skip exported grades or bad grades (if setting says so)
             if ($export_tracking) {
                 $status = $geub->track($grade);
                 if ($this->updatedgradesonly && ($status == 'nochange' || $status == 'unknown')) {
                     continue;
                 }
             }
             fwrite($handle, "\t<result>\n");
             if ($export_tracking) {
                 fwrite($handle, "\t\t<state>{$status}</state>\n");
             }
             // only need id number
             fwrite($handle, "\t\t<assignment>{$grade_item->idnumber}</assignment>\n");
             // this column should be customizable to use either student id, idnumber, uesrname or email.
             fwrite($handle, "\t\t<student>{$user->idnumber}</student>\n");
             fwrite($handle, "\t\t<score>{$gradestr}</score>\n");
             if ($this->export_feedback) {
                 $feedbackstr = $this->format_feedback($userdata->feedbacks[$itemid]);
                 fwrite($handle, "\t\t<feedback>{$feedbackstr}</feedback>\n");
             }
             fwrite($handle, "\t</result>\n");
         }
     }
     fwrite($handle, "</results>");
     fclose($handle);
     $gui->close();
     $geub->close();
     if (strpos($CFG->wwwroot, 'https://') === 0) {
         //https sites - watch out for IE! KB812935 and KB316431
         @header('Cache-Control: max-age=10');
         @header('Expires: ' . gmdate('D, d M Y H:i:s', 0) . ' GMT');
         @header('Pragma: ');
     } else {
         //normal http - prevent caching at all cost
         @header('Cache-Control: private, must-revalidate, pre-check=0, post-check=0, max-age=0');
         @header('Expires: ' . gmdate('D, d M Y H:i:s', 0) . ' GMT');
         @header('Pragma: no-cache');
     }
     header("Content-type: text/xml; charset=UTF-8");
     header("Content-Disposition: attachment; filename=\"{$downloadfilename}\"");
     readfile_chunked($tempfilename);
     @unlink($tempfilename);
     exit;
 }

function cm_synchronize_moodle_class_grades()
{
    global $CFG, $CURMAN;
    require_once $CFG->dirroot . '/grade/lib.php';
    if ($moodleclasses = moodle_get_classes()) {
        $timenow = time();
        foreach ($moodleclasses as $class) {
            $cmclass = new cmclass($class->classid);
            $context = get_context_instance(CONTEXT_COURSE, $class->moodlecourseid);
            $moodlecourse = $CURMAN->db->get_record('course', 'id', $class->moodlecourseid);
            // Get CM enrolment information (based on Moodle enrolments)
            // IMPORTANT: this record set must be sorted using the Moodle
            // user ID
            $relatedcontextsstring = get_related_contexts_string($context);
            $sql = "SELECT DISTINCT u.id AS muid, u.username, cu.id AS cmid, stu.*\n                          FROM {$CURMAN->db->prefix_table('user')} u\n                          JOIN {$CURMAN->db->prefix_table('role_assignments')} ra ON u.id = ra.userid\n                     LEFT JOIN {$CURMAN->db->prefix_table(USRTABLE)} cu ON cu.idnumber = u.idnumber\n                     LEFT JOIN {$CURMAN->db->prefix_table(STUTABLE)} stu on stu.userid = cu.id AND stu.classid = {$cmclass->id}\n                         WHERE ra.roleid in ({$CFG->gradebookroles})\n                           AND ra.contextid {$relatedcontextsstring}\n                      ORDER BY muid ASC";
            $causers = get_recordset_sql($sql);
            if (empty($causers)) {
                // nothing to see here, move on
                continue;
            }
            /// Get CM completion elements and related Moodle grade items
            $comp_elements = array();
            $gis = array();
            if (isset($cmclass->course) && get_class($cmclass->course) == 'course' && ($elements = $cmclass->course->get_completion_elements())) {
                foreach ($elements as $element) {
                    // It looks like Moodle actually stores the "slashes" on the idnumber field in the grade_items
                    // table so we need to addslashes twice to this value if it needs them. =(  - ELIS-1830
                    $idnumber = addslashes($element->idnumber);
                    if ($idnumber != $element->idnumber) {
                        $idnumber = addslashes($idnumber);
                    }
                    if ($gi = get_record('grade_items', 'courseid', $class->moodlecourseid, 'idnumber', $idnumber)) {
                        $gis[$gi->id] = $gi;
                        $comp_elements[$gi->id] = $element;
                    }
                }
            }
            // add grade item for the overall course grade
            $coursegradeitem = grade_item::fetch_course_item($moodlecourse->id);
            $gis[$coursegradeitem->id] = $coursegradeitem;
            if ($coursegradeitem->grademax == 0) {
                // no maximum course grade, so we can't calculate the
                // student's grade
                continue;
            }
            if (!empty($elements)) {
                // get current completion element grades if we have any
                // IMPORTANT: this record set must be sorted using the Moodle
                // user ID
                $sql = "SELECT grades.*, mu.id AS muid\n                              FROM {$CURMAN->db->prefix_table(GRDTABLE)} grades\n                              JOIN {$CURMAN->db->prefix_table(USRTABLE)} cu ON grades.userid = cu.id\n                              JOIN {$CURMAN->db->prefix_table('user')} mu ON cu.idnumber = mu.idnumber\n                             WHERE grades.classid = {$cmclass->id}\n                          ORDER BY mu.id";
                $allcompelemgrades = get_recordset_sql($sql);
                $last_rec = null;
                // will be used to store the last completion
                // element that we fetched from the
                // previous iteration (which may belong
                // to the current user)
            }
            // get the Moodle course grades
            // IMPORTANT: this iterator must be sorted using the Moodle
            // user ID
            $gradedusers = new graded_users_iterator($moodlecourse, $gis, 0, 'id', 'ASC', null);
            $gradedusers->init();
            // only create a new enrolment record if there is only one CM
            // class attached to this Moodle course
            $doenrol = $CURMAN->db->count_records(CLSMDLTABLE, 'moodlecourseid', $class->moodlecourseid) == 1;
            // main loop -- go through the student grades
            while (($sturec = rs_fetch_next_record($causers)) && ($stugrades = $gradedusers->next_user())) {
                // skip user records that don't match up
                // (this works since both sets are sorted by Moodle user ID)
                // (in theory, we shouldn't need this, but just in case...)
                while ($sturec && $sturec->muid < $stugrades->user->id) {
                    $sturec = rs_fetch_next_record($causers);
                }
                if (!$sturec) {
                    break;
                }
                while ($stugrades && $stugrades->user->id < $sturec->muid) {
                    $stugrades = $gradedusers->next_user();
                }
                if (!$stugrades) {
                    break;
                }
                /// If the user doesn't exist in CM, skip it -- should we flag it?
                if (empty($sturec->cmid)) {
                    mtrace("No user record for Moodle user id: {$sturec->muid}: {$sturec->username}<br />\n");
                    continue;
                }
                $cmuserid = $sturec->cmid;
                /// If no enrolment record in ELIS, then let's set one.
                if (empty($sturec->id)) {
                    if (!$doenrol) {
                        continue;
                    }
                    $sturec->classid = $class->classid;
                    $sturec->userid = $cmuserid;
                    /// Enrolment time will be the earliest found role assignment for this user.
                    $enroltime = get_field('role_assignments', 'MIN(timestart) as enroltime', 'contextid', $context->id, 'userid', $sturec->muid);
                    $sturec->enrolmenttime = !empty($enroltime) ? $enroltime : $timenow;
                    $sturec->completetime = 0;
                    $sturec->endtime = 0;
//.........这里部分代码省略.........

function grade_get_graded_users_select($report, $course, $userid, $groupid, $includeall)
{
    global $USER, $CFG;
    if (is_null($userid)) {
        $userid = $USER->id;
    }
    $coursecontext = context_course::instance($course->id);
    $defaultgradeshowactiveenrol = !empty($CFG->grade_report_showonlyactiveenrol);
    $showonlyactiveenrol = get_user_preferences('grade_report_showonlyactiveenrol', $defaultgradeshowactiveenrol);
    $showonlyactiveenrol = $showonlyactiveenrol || !has_capability('moodle/course:viewsuspendedusers', $coursecontext);
    $menu = array();
    // Will be a list of userid => user name
    $menususpendedusers = array();
    // Suspended users go to a separate optgroup.
    $gui = new graded_users_iterator($course, null, $groupid);
    $gui->require_active_enrolment($showonlyactiveenrol);
    $gui->init();
    $label = get_string('selectauser', 'grades');
    if ($includeall) {
        $menu[0] = get_string('allusers', 'grades');
        $label = get_string('selectalloroneuser', 'grades');
    }
    while ($userdata = $gui->next_user()) {
        $user = $userdata->user;
        $userfullname = fullname($user);
        if ($user->suspendedenrolment) {
            $menususpendedusers[$user->id] = $userfullname;
        } else {
            $menu[$user->id] = $userfullname;
        }
    }
    $gui->close();
    if ($includeall) {
        $menu[0] .= " (" . (count($menu) + count($menususpendedusers) - 1) . ")";
    }
    if (!empty($menususpendedusers)) {
        $menu[] = array(get_string('suspendedusers') => $menususpendedusers);
    }
    $select = new single_select(new moodle_url('/grade/report/' . $report . '/index.php', array('id' => $course->id)), 'userid', $menu, $userid);
    $select->label = $label;
    $select->formid = 'choosegradeuser';
    return $select;
}

 /**
  * Prints preview of exported grades on screen as a feedback mechanism
  * @param bool $require_user_idnumber true means skip users without idnumber
  */
 function display_preview($require_user_idnumber = false)
 {
     print_heading(get_string('previewrows', 'grades'));
     echo '<table>';
     echo '<tr>';
     echo '<th>' . get_string("firstname") . "</th>" . '<th>' . get_string("lastname") . "</th>" . '<th>' . get_string("idnumber") . "</th>" . '<th>' . get_string("institution") . "</th>" . '<th>' . get_string("department") . "</th>" . '<th>' . get_string("email") . "</th>";
     foreach ($this->columns as $grade_item) {
         echo '<th>' . $this->format_column_name($grade_item) . '</th>';
         /// add a column_feedback column
         if ($this->export_feedback) {
             echo '<th>' . $this->format_column_name($grade_item, true) . '</th>';
         }
     }
     echo '</tr>';
     /// Print all the lines of data.
     $i = 0;
     $gui = new graded_users_iterator($this->course, $this->columns, $this->groupid);
     $gui->init();
     while ($userdata = $gui->next_user()) {
         // number of preview rows
         if ($this->previewrows and $this->previewrows <= $i) {
             break;
         }
         $user = $userdata->user;
         if ($require_user_idnumber and empty($user->idnumber)) {
             // some exports require user idnumber
             continue;
         }
         $gradeupdated = false;
         // if no grade is update at all for this user, do not display this row
         $rowstr = '';
         foreach ($this->columns as $itemid => $unused) {
             $gradetxt = $this->format_grade($userdata->grades[$itemid]);
             // get the status of this grade, and put it through track to get the status
             $g = new grade_export_update_buffer();
             $grade_grade = new grade_grade(array('itemid' => $itemid, 'userid' => $user->id));
             $status = $g->track($grade_grade);
             if ($this->updatedgradesonly && ($status == 'nochange' || $status == 'unknown')) {
                 $rowstr .= '<td>' . get_string('unchangedgrade', 'grades') . '</td>';
             } else {
                 $rowstr .= "<td>{$gradetxt}</td>";
                 $gradeupdated = true;
             }
             if ($this->export_feedback) {
                 $rowstr .= '<td>' . $this->format_feedback($userdata->feedbacks[$itemid]) . '</td>';
             }
         }
         // if we are requesting updated grades only, we are not interested in this user at all
         if (!$gradeupdated && $this->updatedgradesonly) {
             continue;
         }
         echo '<tr>';
         echo "<td>{$user->firstname}</td><td>{$user->lastname}</td><td>{$user->idnumber}</td><td>{$user->institution}</td><td>{$user->department}</td><td>{$user->email}</td>";
         echo $rowstr;
         echo "</tr>";
         $i++;
         // increment the counter
     }
     echo '</table>';
     $gui->close();
 }

 /**
  * To be implemented by child classes
  */
 public function print_grades()
 {
     global $CFG;
     require_once $CFG->dirroot . '/lib/excellib.class.php';
     $export_tracking = $this->track_exports();
     $strgrades = get_string('grades');
     /// Calculate file name
     $downloadfilename = clean_filename("{$this->course->shortname} {$strgrades}.xls");
     /// Creating a workbook
     $workbook = new MoodleExcelWorkbook("-");
     /// Sending HTTP headers
     $workbook->send($downloadfilename);
     /// Adding the worksheet
     $myxls =& $workbook->add_worksheet($strgrades);
     /// Print names of all the fields
     $myxls->write_string(0, 0, get_string("firstname"));
     $myxls->write_string(0, 1, get_string("lastname"));
     $myxls->write_string(0, 2, get_string("idnumber"));
     $myxls->write_string(0, 3, get_string("institution"));
     $myxls->write_string(0, 4, get_string("department"));
     $myxls->write_string(0, 5, get_string("email"));
     $pos = 6;
     foreach ($this->columns as $grade_item) {
         $myxls->write_string(0, $pos++, $this->format_column_name($grade_item));
         /// add a column_feedback column
         if ($this->export_feedback) {
             $myxls->write_string(0, $pos++, $this->format_column_name($grade_item, true));
         }
     }
     /// Print all the lines of data.
     $i = 0;
     $geub = new grade_export_update_buffer();
     $gui = new graded_users_iterator($this->course, $this->columns, $this->groupid);
     $gui->init();
     while ($userdata = $gui->next_user()) {
         $i++;
         $user = $userdata->user;
         $myxls->write_string($i, 0, $user->firstname);
         $myxls->write_string($i, 1, $user->lastname);
         $myxls->write_string($i, 2, $user->idnumber);
         $myxls->write_string($i, 3, $user->institution);
         $myxls->write_string($i, 4, $user->department);
         $myxls->write_string($i, 5, $user->email);
         $j = 6;
         foreach ($userdata->grades as $itemid => $grade) {
             if ($export_tracking) {
                 $status = $geub->track($grade);
             }
             $gradestr = $this->format_grade($grade);
             if (is_numeric($gradestr)) {
                 $myxls->write_number($i, $j++, $gradestr);
             } else {
                 $myxls->write_string($i, $j++, $gradestr);
             }
             // writing feedback if requested
             if ($this->export_feedback) {
                 $myxls->write_string($i, $j++, $this->format_feedback($userdata->feedbacks[$itemid]));
             }
         }
     }
     $gui->close();
     $geub->close();
     /// Close the workbook
     $workbook->close();
     exit;
 }

    public function export_grades($oauth)
    {
        global $CFG, $OUTPUT;
        $export_tracking = $this->track_exports();
        $tables = $oauth->show_tables();
        $this->tablename .= ' ' . date("Y-m-d H:i:s", strtotime('+0 days'));
        if (!$oauth->table_exists($this->tablename)) {
            $columns = array("firstname" => 'STRING', "lastname" => 'STRING', "idnumber" => 'STRING', "institution" => 'STRING', "department" => 'STRING', "email" => 'STRING');
            foreach ($this->columns as $grade_item) {
                $column = self::clean_column_name($this->format_column_name($grade_item));
                $columns[$column] = 'NUMBER';
            }
            $result = $oauth->create_table($this->tablename, $columns);
            $tables = $oauth->show_tables();
        }
        /// Print all the lines of data.
        $geub = new grade_export_update_buffer();
        $gui = new graded_users_iterator($this->course, $this->columns, $this->groupid);
        $gui->init();
        $rows = array();
        $separator = ' | ';
        while ($userdata = $gui->next_user()) {
            $user = $userdata->user;
            $row = array($user->firstname, $user->lastname, $user->idnumber, $user->institution, $user->department, $user->email);
            $grades = array();
            foreach ($userdata->grades as $itemid => $grade) {
                $grades[(int) $itemid] = $this->format_grade($grade);
            }
            ksort($grades);
            foreach ($grades as $itemid => $grade) {
                $row[] = $grade;
            }
            $rows[] = $row;
        }
        $gui->close();
        $geub->close();
        $result = $oauth->insert_rows($this->tablename, $rows);
        $table = $oauth->table_by_name($this->tablename, true);
        $table_id = $table['table id'];
        // output a basic page and do the popup and redirect
        $table_url = 'https://www.google.com/fusiontables/DataSource?docid=' . $table_id;
        $course_url = $CFG->wwwroot . '/course/view.php?id=' . $this->course->id;
        print_grade_page_head($this->course->id, 'export', 'fusion', get_string('exportto', 'grades') . ' ' . get_string('modulename', 'gradeexport_fusion'));
        echo $OUTPUT->heading(get_string('popup', 'gradeexport_fusion'));
        ?>
            <script type="text/javascript">
            //<![CDATA[
                url = "<?php 
        echo $table_url;
        ?>
";
                courseurl = "<?php 
        echo $course_url;
        ?>
";
                window.open(url, "_blank", 'left=20,top=20,width=1024,height=768,toolbar=1,resizable=1,menubar=1,scrollbars=1,status=1,location=1');
                window.location = courseurl;
            //]]>
            </script>
            <noscript>
                <?php 
        echo get_string('noscript', 'gradeexport_fusion');
        ?>
            </noscript>
        <?php 
        echo $OUTPUT->footer();
        exit;
    }

//.........这里部分代码省略.........
        $xml->add_weight_item($item->id, $item->itemname, $item->grademax, $item->grademax);
    }
    foreach ($extra_items as $item) {
        $itemtable->data[] = new html_table_row(array($item->itemname, $item->grademax . '%', '是'));
        $xml->add_weight_item($item->id, $item->itemname, $item->grademax, $item->grademax, true);
    }
    $itemtable->data[] = new html_table_row(array($total_item->itemname, $total_item->grademax . '%', '-'));
    if ($dryrun) {
        echo html_writer::table($itemtable);
    }
    // 本地不存在的用户
    if (!empty($nonexist_users)) {
        echo $output->heading('教务处有记录而本站无对应用户的学生', 3);
        $usertable = new html_table();
        $usertable->head = array('序号', '姓名', '学号');
        $count = 0;
        foreach ($nonexist_users as $user) {
            $row = array();
            $count++;
            $row[] = new html_table_cell($count);
            $row[] = new html_table_cell($user->name);
            $row[] = new html_table_cell($user->code);
            $usertable->data[] = new html_table_row($row);
        }
        echo html_writer::table($usertable);
    }
    // 用户成绩
    if ($dryrun) {
        echo $output->heading('可导出成绩', 3);
    }
    $items = $sub_items + $extra_items;
    $items[$total_item->id] = $total_item;
    $geub = new grade_export_update_buffer();
    $gui = new graded_users_iterator($course, $items);
    $gui->init();
    $usertable = new html_table();
    $usertable->head = array('序号', '姓名', '学号');
    foreach ($items as $item) {
        $usertable->head[] = $item->itemname;
    }
    $count = 0;
    while ($userdata = $gui->next_user()) {
        $user = $userdata->user;
        if ($user->auth != 'cas' || empty($user->idnumber)) {
            // 非cas用户成绩不可导出
            continue;
        }
        if (!array_key_exists($user->id, $export_users)) {
            // 教务处无记录用户不导出
            continue;
        }
        $row = array();
        $count++;
        $row[] = new html_table_cell($count);
        $row[] = new html_table_cell($user->firstname);
        $row[] = new html_table_cell($user->idnumber);
        $grades = array();
        foreach ($userdata->grades as $itemid => $grade) {
            if ($itemid == $total_item->id) {
                // 总分
                $finalgrade = round($grade->finalgrade);
                $grades[0] = $finalgrade;
            } else {
                $finalgrade = round($grade->finalgrade, 1);
                $grades[$itemid] = $finalgrade;
            }

 /**
  * Load a valid list of users for this gradebook as the screen "items".
  * @return array $users A list of enroled users.
  */
 protected function load_users()
 {
     global $CFG;
     // Create a graded_users_iterator because it will properly check the groups etc.
     $defaultgradeshowactiveenrol = !empty($CFG->grade_report_showonlyactiveenrol);
     $showonlyactiveenrol = get_user_preferences('grade_report_showonlyactiveenrol', $defaultgradeshowactiveenrol);
     $showonlyactiveenrol = $showonlyactiveenrol || !has_capability('moodle/course:viewsuspendedusers', $this->context);
     require_once $CFG->dirroot . '/grade/lib.php';
     $gui = new \graded_users_iterator($this->course, null, $this->groupid);
     $gui->require_active_enrolment($showonlyactiveenrol);
     $gui->init();
     // Flatten the users.
     $users = array();
     while ($user = $gui->next_user()) {
         $users[$user->user->id] = $user->user;
     }
     return $users;
 }

 public function display_preview($require_user_idnumber = false)
 {
     global $OUTPUT;
     $userprofilefields = grade_helper::get_user_profile_fields($this->course->id, $this->usercustomfields);
     $formatoptions = new stdClass();
     $formatoptions->para = false;
     $exporttitle = array('Client Code', 'Client Name', 'Qualification Code', 'Unit Code', 'Unit Start Date', 'Unit End Date', 'Outcome Name', 'Outcome Code');
     echo $OUTPUT->heading(get_string('previewrows', 'grades'));
     echo '<table class="csv-table">';
     echo '<tr>';
     foreach ($exporttitle as $field) {
         echo '<th>' . $field . '</th>';
     }
     if (!$this->onlyactive) {
         echo '<th>' . get_string("suspended") . "</th>";
     }
     // foreach ($this->columns as $grade_item) {
     //     echo '<th>'.$this->format_column_name($grade_item).'</th>';
     //     /// add a column_feedback column
     //     if ($this->export_feedback) {
     //         echo '<th>'.$this->format_column_name($grade_item, true).'</th>';
     //     }
     // }
     echo '</tr>';
     /// Print all the lines of data.
     $i = 0;
     $gui = new graded_users_iterator($this->course, $this->columns, $this->groupid);
     $gui->require_active_enrolment($this->onlyactive);
     $gui->allow_user_custom_fields($this->usercustomfields);
     $gui->init();
     while ($userdata = $gui->next_user()) {
         // number of preview rows
         if ($this->previewrows and $this->previewrows <= $i) {
             break;
         }
         $user = $userdata->user;
         if ($require_user_idnumber and empty($user->idnumber)) {
             // some exports require user idnumber so we can match up students when importing the data
             continue;
         }
         $gradeupdated = false;
         // if no grade is update at all for this user, do not display this row
         $rowstr = '';
         foreach ($this->columns as $itemid => $grade_item) {
             $gradetxt = $this->format_grade($userdata->grades[$itemid]);
             $activity_start_date = $this->get_activity_start_date($this->course, $user, $grade_item);
             $grade_modified = $userdata->grades[$itemid]->timemodified;
             $client_code = $userdata->user->idnumber;
             $client_name = $userdata->user->firstname . ' ' . $userdata->user->lastname;
             // $course_code = $this->get_course_short_name($grade_item);
             $course_code = $this->course->idnumber;
             // $unit_code = $grade_item->itemname;
             $unit_code = $grade_item->idnumber;
             $unit_start = $activity_start_date ? $activity_start_date->format('d-m-Y') : '-';
             $unit_end = $grade_modified ? userdate($grade_modified, '%d-%m-%Y') : '-';
             $grade_name = $this->get_grade_name($gradetxt);
             if ($grade_item->itemtype == 'category') {
                 $category_start_date = $this->get_category_start_date($this->course, $user, $grade_item);
                 $unit_start = $category_start_date ? $category_start_date->format('d-m-Y') : '-';
             }
             // get the status of this grade, and put it through track to get the status
             $g = new grade_export_update_buffer();
             $grade_grade = new grade_grade(array('itemid' => $itemid, 'userid' => $user->id));
             $status = $g->track($grade_grade);
             if ($this->updatedgradesonly && ($status == 'nochange' || $status == 'unknown')) {
                 $rowstr .= '<td>' . get_string('unchangedgrade', 'grades') . '</td>';
             } else {
                 $rowstr .= "<tr>\n                                    <td>{$client_code}</td>\n                                    <td>{$client_name}</td>\n                                    <td>{$course_code}</td>\n                                    <td>{$unit_code}</td>\n                                    <td>{$unit_start}</td>\n                                    <td>{$unit_end}</td>\n                                    <td>{$grade_name}</td>\n                                    <td>{$gradetxt}</td>\n                                </tr>";
                 $gradeupdated = true;
             }
             if ($this->export_feedback) {
                 $rowstr .= '<td>' . $this->format_feedback($userdata->feedbacks[$itemid]) . '</td>';
             }
         }
         // if we are requesting updated grades only, we are not interested in this user at all
         if (!$gradeupdated && $this->updatedgradesonly) {
             continue;
         }
         echo '<tr>';
         echo $rowstr;
         echo "</tr>";
         $i++;
         // increment the counter
     }
     echo '</table>';
     $gui->close();
 }

 public function print_grades()
 {
     global $CFG;
     $exporttracking = $this->track_exports();
     $course = $this->course;
     $strgrades = get_string('grades');
     $profilefields = grade_helper::get_user_profile_fields($this->course->id, $this->usercustomfields);
     $courseid = $course->id;
     $shortname = format_string($this->course->shortname, true, array('context' => context_course::instance($this->course->id)));
     $downloadfilename = clean_filename("{$shortname} {$strgrades}");
     $csvexport = new csv_export_writer($this->separator);
     $csvexport->filename = clean_filename("{$downloadfilename}.csv");
     // Print names of all the fields.
     $exporttitle = array();
     $shortname = format_string($this->course->shortname, true, array('context' => context_course::instance($this->course->id)));
     $exporttitle[] = $shortname . "";
     $csvexport->add_data($exporttitle);
     $exporttitle = array();
     $exporttitle[] = "TERM";
     $exporttitle[] = "Class Number";
     $exporttitle[] = "ID";
     $exportti