asp遍历本地文件判断图片路径是否正确

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<%@LANGUAGE="VBSCRIPT" CODEPAGE="936"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title>无标题文档</title>
</head>

<body>
<%
Function GetBody(url)'
Set Retrieval = CreateObject("Microsoft.XMLHTTP") 
Retrieval.Open "Get", url, False, "", "" 
Retrieval.Send()
if (Retrieval.status=404) then
GetBody=""
else
GetBody =Retrieval.ResponseBody
end if
End Function

str = GetBody("http://www.youdao.com.cn/images/2_star_4.jpg")

if cstr(str) <> "" then
response.write "存在"
else
response.write "不存在"
end if

%>
</body>
</html>

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