function douploadimg() {
    $imgname=$_FILES['photofile']['name'];
    $extname=file::extname($imgname);
    $destfile=$_ENV['attachment']->makepath($extname);
    $arrupload=file::uploadfile($_FILES['photofile'],$destfile);
    
    if($arrupload['result']==true){
      if(isset($this->setting['watermark'])){
        $_ENV['watermark']->image($destfile,$destfile);
      }
      $uid=intval($this->user['uid'])?$this->user['uid']:0;
      $did=intval($this->get['2'])?$this->get['2']:0;
      $_ENV['attachment']->add_attachment($uid ,$did,$imgname ,$destfile ,htmlspecialchars($this->post['picAlt']) ,$extname);

function dodownload(){
    if(!isset($this->get[2]) || !is_numeric($this->get[2])){
      $this->message($this->view->lang['parameterError'],'BACK');
    }
    $result=$_ENV['attachment']->get_attachment('id',$this->get[2],0);
    if(!(bool)$attachment=$result[0]){
      $this->message($this->view->lang['attachIsNotExist'],'BACK');
    }
    if($this->user['uid'] != $attachment['uid']) {
      // 判断金币
      $credit1 = $this->user['credit1'];    // 拥有金币数
      $coindown = $attachment['coindown'];  // 下载此附件需要消耗金币数
      if(0 > $credit1 - $coindown) {
        // 金币不足
        $this->message($this->view->lang['goldNotEnough'],"index.php?doc-view-".$attachment['did'],0);
      }
      // 扣除金币
      $_ENV['user']->add_credit($this->user['uid'],'attachment-down',0,-$coindown);
      // 增加金币
      $_ENV['user']->add_credit($attachment['uid'],'attachment-down',0,$coindown);
    }
    $_ENV['attachment']->update_downloads($attachment['id']);
    file::downloadfile($attachment['attachment'],$attachment['filename']);
  }