phpexcel 把单元格里的图片保存到本地

class Main extends CI_Controller{

    function __construct(){
        //必需先覆盖父类的析构函数
         parent::__construct();
        //加载session
        $this->load->library('session');
        //加载加密类
        $this->load->library('encrypt');
    }
    function index(){
        $Vdate=array("title"=>"xx系统");
        //图片tmp path
        $TmpPath="images/tmp_execl/";
        //加载Execl读取自定义类
        $this->load->library('phpexecl/PHPExcel');
        $objReader = PHPExcel_IOFactory::createReader('Excel5');
        //$objReader->setReadDataOnly(true);
        $objPHPExcel = $objReader->load('images/tmp/test.xls');
        $currentSheet = $objPHPExcel->getActiveSheet();
        //先处理图片
        $AllImages= $currentSheet->getDrawingCollection();
        $ArrayTmp="";
        foreach($AllImages as $drawing){
            if($drawing instanceof PHPExcel_Worksheet_MemoryDrawing){
                $image = $drawing->getImageResource();
                $filename=$drawing->getIndexedFilename();
                $XY=$drawing->getCoordinates();
                //把图片存起来
                imagepng($image, $TmpPath.$filename);
                //把图片的单元格的值设置为图片名称
                $cell = $currentSheet->getCell($XY);
                $cell->setValue($filename);
            }
        }
        //处理每个单元格的数据
        $allColumn = $currentSheet->getHighestColumn();
        $allRow = $currentSheet->getHighestRow();
        for($currentRow = 1;$currentRow<=$allRow;$currentRow++){
            for($currentColumn='A';$currentColumn<=$allColumn;$currentColumn++){
                $address = $currentColumn.$currentRow;
                //获取单元格数据
                $CellDate=$currentSheet->getCell($address)->getValue();
                //echo $currentSheet->getCell($address)->getValue()."\t";
                //写入数据库.....
                //.....
            }
            //echo "\n";
        }
        $this->load->view('main_view',$Vdate);
    }

}