从新浪提取上海天气的vbs

来源：动网先锋作者：飞鸟出处：巧巧读书 2005-12-06 进入讨论组

起始很简单的。分析一下抓下来的代码，然后处理一下就行了。

'文件：weather.vbs 放入计划任务，每天早上8:30执行，生成饱含
'文件供首页使用
'执行方式：cscript D:\上海国家会计学院网站\内部社区\vbs\weather.vbs
' Symantec ScriptBlocking Authenticated File
' E9815BB2-5813-400B-9ED5-156350335DE3

const incFilePath = "D:\上海国家会计学院网站\内部社区\web\club\" '包含文件所在目录,最后的\号是必须的
const logfile = "d:\club-job-log.txt" '日志文件
const incWeather = "weather-report.asp" '包含文件所在目录,最后的\号是必须的
dim fs
dim f
on error resume next

Set fs = CreateObject("Scripting.FileSystemObject")
dim wstr
wstr=getHTTPPage("http://sh.sina.com.cn/")
'Response.Write wstr

if instr(wstr,"＜img src=images/sina_sh/new/sh24.gif width=172 height=17＞")＞0 then
wstr=mid(wstr,instr(wstr,"＜img src=images/sina_sh/new/sh24.gif width=172 height=17＞")+len("＜img src=images/sina_sh/new/sh24.gif width=172 height=17＞"))
wstr=mid(wstr,instr(wstr,"＜table width=160 border=0 cellspacing=0 cellpadding=0＞"))
wstr=mid(wstr,1,instr(wstr,"＜/table＞")+len("＜/table＞"))
end if
wstr=replace(wstr,"＜tr＞＜td colspan=3 align=right＞＜a href=http://weather.sina.com.cn/＞其他城市＜/a＞＜font color=#015B7B＞＞＞＜/font＞＜/td＞＜/tr＞","")
dim pos1,pos2
pos1=instr(wstr,"＜tr＞")
pos2=instr(pos1,wstr,"＜/tr＞")
wstr=right(wstr,len(wstr)-pos2-4-4)
wstr=replace(wstr,"＜/table＞","")
wstr=replace(wstr,"width=35","")
wstr=replace(wstr,"width=45","")
wstr=replace(wstr,"width=60","")
'Response.Write wstr
if err.number=0 then
Set f = fs.CreateTextFile(incFilePath & incWeather,true)
f.write wstr
set f = nothing
else
wscript.echo err.description
end if
set fs = nothing

Sub writeLog(Msg)
On Error Resume Next
Dim f
Set f = fs.OpenTextFile(logfile,8,true)
f.WriteLine now & " - " & Msg
f.close
End Sub

function getHTTPPage(url)
on error resume next
dim http
set http=createobject("MSXML2.XMLHTTP")
Http.open "GET",url,false
Http.send()
if Http.readystate＜＞4 then
exit function
end if
getHTTPPage=bytes2BSTR(Http.responseBody)
set http=nothing
if err.number＜＞0 then err.Clear
end function

Function bytes2BSTR(vIn)
dim strReturn
dim i,ThisCharCode,NextCharCode
strReturn = ""
For i = 1 To LenB(vIn)
ThisCharCode = AscB(MidB(vIn,i,1))
If ThisCharCode ＜ &H80 Then
strReturn = strReturn & Chr(ThisCharCode)
Else
NextCharCode = AscB(MidB(vIn,i+1,1))
strReturn = strReturn & Chr(CLng(ThisCharCode) * &H100 + CInt(NextCharCode))
i = i + 1
End If
Next
bytes2BSTR = strReturn
End Function

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