Create String from object PHPExcel

Question

I created a PHPWriter through PHPExcel and was able to write to my excel file. now after writing to my excel file i want to retrieve the value from cell C9 and display it to screen. What am i doing wrong ? . How can i display the value of C9 ! Thanks

    $objReader = PHPExcel_IOFactory::createReader('Excel2007');
    $objPHPExcelReader = $objReader->load('test.xlsx');
    $objPHPExcelReader->setActiveSheetIndex(1);
    $objPHPExcel->getActiveSheet()->getCell('C9')->getValue();
    $objReader = new PHPExcel_Reader_Excel2007($objPHPExcel);