dedecms后台验证码总提示错误的解决方法

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我是靠谱客的博主害怕帽子，最近开发中收集的这篇文章主要介绍dedecms后台验证码总提示错误的解决方法，觉得挺不错的，现在分享给大家，希望可以做个参考。

概述

直接用下面的代码,覆盖dede中的login.php即可

复制代码代码如下:

<? 
require_once(dirname(__FILE__)."/../include/config_base.php"); 
require_once(dirname(__FILE__)."/../include/inc_userlogin.php"); 
if(empty($dopost)) $dopost=""; 
//-------------------------------- 
//登录检测 
//-------------------------------- 
if($dopost=="login") 
{ 
  if(empty($validate)) $validate==""; 
  else $validate = strtolower($validate); 

  if( empty($_SESSION["s_validate"]) ) $svali = ""; 
  else $svali = $_SESSION["s_validate"]; 

   $cuserLogin = new userLogin(); 
     if(!empty($userid)&&!empty($pwd)) 
     { 
              $res = $cuserLogin->checkUser($userid,$pwd); 
              //成功登录 
              if($res==1){ 
                       $cuserLogin->keepUser(); 
                       if(!empty($gotopage)){ 
                               //header("location:$gotopage"); 
                               ShowMsg("成功登录，正在转向管理管理主页！",$gotopage); 
                               exit(); 
                       } 
                       else{ 
                               ShowMsg("成功登录，正在转向管理管理主页！","index.php"); 
                               //header("location:index.php"); 
                               exit(); 
                       } 
              } 
              else if($res==-1){ 
                      ShowMsg("你的用户名不存在!",""); 
              } 
              else{ 
                      ShowMsg("你的密码错误!",""); 
              } 
     }//<-密码不为空 
     else{ 
            ShowMsg("用户和密码没填写完整!",""); 
     } 

//<-验证用户 
} 

?> 
<html> 
<head> 
<meta http-equiv="Content-Type" content="text/html; charset=gb2312"> 
<title>管理系统</title> 
<link href="base.css" rel="stylesheet" type="text/css"> 
</head> 
<body style='MARGIN: 0px' bgColor='#ffffff' leftMargin='0' topMargin='0' scroll='no'> 
<table width="98%" border="0" align="center" cellpadding="0" cellspacing="0" bordercolor="#111111" style="BORDER-COLLAPSE: collapse"> 
  <tr>  
    <td width="100%" height="64" background="img/indextitlebg.gif"><img src="img/indextitle.gif" width="250" height="64">  
    </td> 
  </tr> 
  <tr>  
    <td width="100%" height="20">　</td> 
  </tr> 
  <tr>  
    <td width="100%" height="20" valign="bottom"> 
        <table width="540" border="0" cellspacing="0" cellpadding="0"> 
        <tr>  
          <td align="right" style="FONT-SIZE: 2pt"> </td> 
        </tr> 
        <tr>  
          <td><IMG height=14 src="img/book1.gif" width=20>  用户登录</td> 
        </tr> 
      </table></td> 
  </tr> 
  <tr>  
    <td width="100%" height="1" background="img/sp_bg.gif"></td> 
  </tr> 
  <tr>  
    <td width="100%" height="2"></td> 
  </tr> 
  <tr>  
    <td width="100%" height="136" valign="top"> 
        <form name="form1" method="post" action="login.php"> 
        <input type="hidden" name="gotopage" value="<?if(!empty($gotopage)) echo $gotopage;?>"> 
        <input type="hidden" name="dopost" value="login"> 
        <table width="540" border="0" cellspacing="0" cellpadding="0"> 
          <tr>  
            <td colspan="2" height="4"></td> 
          </tr> 
          <tr>  
            <td width="156" height="30" align="center"> 用户名：</td> 
            <td width="384"> <input type="text" name="userid" style="width:150;height:20">  
            </td> 
          </tr> 
          <tr>  
            <td height="30" align="center"> 密　码： </td> 
            <td> <input type="password" name="pwd" style="width:150;height:20">  
            </td> 
          </tr> 

          <tr>  
            <td height="50" colspan="2" align="center"> <input type="button" name="sm1" value="登录" style="background-color:#BAE171;border:1px solid #666666" onClick="this.form.submit();">  
                <input type="button" name="sm2" value="Power by DedeCms" onClick="window.open('http://www.uoften.com');" style="background-color:#FFFFFF;border:1px solid #DDDDDD;color:#DDDDDD">  
                </td> 
          </tr> 
        </table> 
      </form></td> 
  </tr> 
  <tr>  
    <td width="100%" height="2" valign="top"></td> 
  </tr> 
</table> 
</body> 
</html> 