dedecms二次开发上下页标签的修改

织梦CMS 5.3 以前版本没有调用图片的功能，从5.5后加入了些功能，调用起来很方便

{dede:prenext get='nextimg'/}　{dede:prenext get='preimg'/}　就是上下页链接，可以显示图片的，可是我想要的功能是

做一个图片幻灯类似于新浪这种。

就是　“上一图集”　“下一图集”　的样子。

织梦不带有这个功能，需要我们自己来扩展

include/arc.archives.class.php　修改　GetPreNext() 　方法

//获取上一篇，下一篇链接
    function GetPreNext($gtype='')
    {
        $rs = '';
        if(count($this->PreNext)<2)
        {
            $aid = $this->ArcID;
            $preR = $this->dsql->GetOne("Select id From `qrx_arctiny` where id<$aid And arcrank>-1 And typeid='{$this->Fields['typeid']}' order by id desc");
            $nextR = $this->dsql->GetOne("Select id From `qrx_arctiny` where id>$aid And arcrank>-1 And typeid='{$this->Fields['typeid']}' order by id asc");
            $next = (is_array($nextR) ? " where arc.id={$nextR['id']} " : ' where 1>2 ');
            $pre = (is_array($preR) ? " where arc.id={$preR['id']} " : ' where 1>2 ');
            $query = "Select arc.id,arc.title,arc.shorttitle,arc.typeid,arc.ismake,arc.senddate,arc.arcrank,arc.money,arc.filename,arc.litpic,
                        t.typedir,t.typename,t.namerule,t.namerule2,t.ispart,t.moresite,t.siteurl,t.sitepath
                        from `qrx_archives` arc left join q_arctype t on arc.typeid=t.id ";
            $nextRow = $this->dsql->GetOne($query.$next);
            $preRow = $this->dsql->GetOne($query.$pre);
            if(is_array($preRow))
            {
                $mlink = GetFileUrl($preRow['id'],$preRow['typeid'],$preRow['senddate'],$preRow['title'],$preRow['ismake'],$preRow['arcrank'],
                $preRow['namerule'],$preRow['typedir'],$preRow['money'],$preRow['filename'],$preRow['moresite'],$preRow['siteurl'],$preRow['sitepath']);
                $this->PreNext['pre'] = "上一篇：<a href='$mlink'>{$preRow['title']}</a> ";
                $this->PreNext['preimg'] = "<a href='$mlink'><img src=\"{$preRow['litpic']}\" alt=\"{$preRow['title']}\"/></a> ";
                $this->PreNext['pretj'] = "<a href='$mlink'><<上一图集</a> ";
            }
            else
            {
                $this->PreNext['pre'] = "上一篇：没有了 ";
                $this->PreNext['preimg'] ="<img src=\"/templets/default/images/nophoto.jpg\" alt=\"对不起，没有上一图集了！\"/>";
                $this->PreNext['pretj'] = "<a href='$mlink'>没有了</a> ";
            }
            if(is_array($nextRow))
            {
                $mlink = GetFileUrl($nextRow['id'],$nextRow['typeid'],$nextRow['senddate'],$nextRow['title'],$nextRow['ismake'],$nextRow['arcrank'],
                $nextRow['namerule'],$nextRow['typedir'],$nextRow['money'],$nextRow['filename'],$nextRow['moresite'],$nextRow['siteurl'],$nextRow['sitepath']);
                $this->PreNext['next'] = "下一篇：<a href='$mlink'>{$nextRow['title']}</a> ";
                $this->PreNext['nextimg'] = "<a href='$mlink'><img src=\"{$nextRow['litpic']}\" alt=\"{$nextRow['title']}\"/></a> ";
                $this->PreNext['nexttj'] = "<a href='$mlink'>下一图集>></a> ";
            }
            else
            {
                $this->PreNext['next'] = "下一篇：没有了 ";
                $this->PreNext['nextimg'] ="<a href='javascript:void(0)' alt=\"\"><img src=\"/templets/default/images/nophoto.jpg\" alt=\"对不起，没有下一图集了！\"/></a>";
                $this->PreNext['nexttj'] = "<a href='$mlink'>没有了</a> ";
            }
        }
        if($gtype=='pre')
        {
            $rs = $this->PreNext['pre'];
        }
        else if($gtype=='preimg'){

            $rs = $this->PreNext['preimg'];
        }
        else if($gtype=='pretj'){

            $rs = $this->PreNext['pretj'];
        }
        else if($gtype=='next')
        {
            $rs = $this->PreNext['next'];
        }
        else if($gtype=='nextimg'){

            $rs = $this->PreNext['nextimg'];
        }
        else if($gtype=='nexttj'){

            $rs = $this->PreNext['nexttj'];
        }
        else
        {
            $rs = $this->PreNext['pre']."   ".$this->PreNext['next'];
        }
        return $rs;
    }