一个最简单phpExcel导出的例子，麻烦指点一上

一个最简单phpExcel导出的例子，麻烦指点一下？
php版本 5.2 线程安全 vc6
服务器：apache2.2 线程 模块加载方式（CLI）
其他页面运转正常


废话少说，excel的导出代码，最简单的测试代码，但是下载以后打开提示如下

重新命名无效的工作表名称。

PHP code

setActiveSheetIndex(0);      
$objActSheet = $objExcel->getActiveSheet();      
     
//设置当前活动sheet的名称      
$objActSheet->setTitle(iconv('utf-8','gbk', "测试工作pu名字"));     
     
//ROW 1
$objActSheet->setCellValueByColumnAndRow(1,2,iconv('utf-8','gbk', "测试"));
//ROW 2
//ROW 3

//获取数据

    

//在浏览器导出
header("Content-Type: application/force-download");
header('Content-Type: application/vnd.ms-excel');
header("Content-Disposition: attachment;filename=\"导出查询.xls\"");
header('Cache-Control: max-age=0');
header("Cache-Control: must-revalidate, post-check=0, pre-check=0"); 
header("Pragma: no-cache"); 

// 创建文件格式写入对象实例, uncomment      
$objWriter = new PHPExcel_Writer_Excel5($objExcel);         
//到文件      
$objWriter->save("php://output");  
?>

------解决方案--------------------
require('config.php');//加载配置文
header ("Expires: Mon, 26 Jul 1997 05:00:00 GMT");
header ("Last-Modified: " . gmdate("D,d M YH:i:s") . " GMT");
header ("Cache-Control: no-cache, must-revalidate");
header ("Pragma: no-cache");
header ('Content-type: application/x-msexcel');
header ("Content-Disposition: attachment; filename=weibo.xls" );
header ("Content-Description: PHP/INTERBASE Generated Data" );
//
// the next lines demonstrate the generation of the Excel stream
//
$content = $db->getList("select * from weibo_baidu");
$num = count($content);

/*echo $num;
foreach($content as $k=>$contents){
echo $aa=$k+1;
echo "
";
//echo $contents['b_title']."
";
}*/
xlsBOF(); // begin Excel stream
xlsWriteLabel(0, 0,iconv("UTF-8", "GBK",序号) );
xlsWriteLabel(0, 1,iconv("UTF-8", "GBK",发布者));
xlsWriteLabel(0, 2,iconv("UTF-8", "GBK",内容概要) );
xlsWriteLabel(0, 3,iconv("UTF-8", "GBK",URl));
xlsWriteLabel(0, 4,iconv("UTF-8", "GBK",来源));
xlsWriteLabel(0, 5,iconv("UTF-8", "GBK",抓取日期));
foreach($content as $k=>$contents){
$i=$k+1;
xlsWriteLabel($i, 0, $i);
xlsWriteLabel($i, 1, iconv("UTF-8", "GBK",$contents['b_title']));
xlsWriteLabel($i, 2, iconv("UTF-8", "GBK",$contents['b_info']));
xlsWriteLabel($i, 3, iconv("UTF-8", "GBK",$contents['b_url']));
xlsWriteLabel($i, 4, iconv("UTF-8", "GBK",$contents['b_source']));
xlsWriteLabel($i, 5, iconv("UTF-8", "GBK",$contents['b_tiem']));
}
xlsEOF(); // close the stream


// ----- begin of function library -----
// Excel begin of file header
function xlsBOF() {
echo pack("ssssss", 0x809, 0x8, 0x0, 0x10, 0x0, 0x0);
return;
}
// Excel end of file footer
function xlsEOF() {
echo pack("ss", 0x0A, 0x00);
return;
}
// Function to write a Number (double) into Row, Col
function xlsWriteNumber($Row, $Col, $Value) {
echo pack("sssss", 0x203, 14, $Row, $Col, 0x0);