验证码图片无法显示PHP的中问验证码

Class code
{
var $width =160; //图片的宽
var $hight =40; //图片的高
var $image;
var $red =223; //图片的RGB颜色
var $green =225; //红
var $blue =227 ;//绿
var $pix =227 ;//蓝
var $pixcolor; //杂色颜色;
var $pixred = 242; //红
var $pixgreen = 168;//绿
var $pixblue = 162; //蓝
var $txt=null;//验证码文字
var $txtcode=null;
var $txtsub=null;
var $pixnum = 300; //杂点数量
var $i=0;
var $widthpx=0;
var $highty=0;
var $txtreg=50;
var $txtgreen=30;
function createimage() //创建一张图并填色
{
$this->image = imagecreate($this->width,$this->hight);
$this->color = imagecolorallocate($this->image,$this->red,$this->green,$this->blue);
return imagefill($this->image,0,0,$this->color);
}
function createpix() //干扰因素
{
for($this->i=1;$this->i<$this->pixnum;$this->i++)
{
$this->widthpx = rand(0,$this->width);
$this->highty = rand(0,$this->hight);
$this->pixcolor = imagecolorallocate($this->image,$this->pixred,$this->pixgreen,$this->pixblue);
imagesetpixel($this->image,$this->widthpx,$this->highty,$this->pixcolor);
}
}
function gettxt() //创建验证码文字
{
$this->txt = array("我","爱","你","叶","就","慧","明","发","真","的","很","想","不","知","到","为","什","么","就","是","忘","不","了","你","也","许","上","辈","欠","钱");
for($this->i=0;$this->i<6;$this->i++)
{
$this->sub = $this->txt[rand(0,29)];
$this->txtcode.= $this->sub;
}
$this->txtcode = iconv("GB2312","UTF-8",$this->txtcode);
$_SESSION["code"] = $this->txtcode; //产生的验证ID
}
function createstring() //创建验证码图片
{
imagettftext($this->image,20,5,0,40,$this->pixcolor,"C:\WINDOWS\Fonts\simsun.ttc ",$this->txtcode);
header("content-type:image/png");
return imagepng($this->image);
imagedestroy($this->image);
}
function getcodeimage()//获得验证码图片
{
$this->createimage();
$this->gettxt();
$this->createpix();
$this->createstring();
}
}
?>
session_start();
$text = new code;
$text->createimage();
$text->gettxt();
$text->createpix();
$text->createstring();
?>

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