写ASP采集的一些函数

<%

'==================================================
'函数名：GetHttpPage
'作 用：获取网页源码
'参 数：HttpUrl ------网页地址
'==================================================
Function GetHttpPage(HttpUrl)
If IsNull(HttpUrl)=True Or Len(HttpUrl)<18 Or HttpUrl="$False$" Then
GetHttpPage="$False$"
Exit Function
End If
Dim Http
Set Http=server.createobject("MSXML2.XMLHTTP")
Http.open "GET",HttpUrl,False
Http.Send()
If Http.Readystate<>4 then
Set Http=Nothing
GetHttpPage="$False$"
Exit function
End if
GetHTTPPage=bytesToBSTR(Http.responseBody,"GB2312")
Set Http=Nothing
If Err.number<>0 then
Err.Clear
End If
End Function

'==================================================
'函数名：BytesToBstr
'作 用：将获取的源码转换为中文
'参 数：Body ------要转换的变量
'参 数：Cset ------要转换的类型
'==================================================
Function BytesToBstr(Body,Cset)
Dim Objstream
Set Objstream = Server.CreateObject("adodb.stream")
objstream.Type = 1
objstream.Mode =3
objstream.Open
objstream.Write body
objstream.Position = 0
objstream.Type = 2
objstream.Charset = Cset
BytesToBstr = objstream.ReadText
objstream.Close
set objstream = nothing
End Function

'==================================================
'函数名：PostHttpPage
'作 用：登录
'==================================================
Function PostHttpPage(RefererUrl,PostUrl,PostData)
Dim xmlHttp
Dim RetStr
Set xmlHttp = CreateObject("Msxml2.XMLHTTP")
xmlHttp.Open "POST", PostUrl, False
XmlHTTP.setRequestHeader "Content-Length",Len(PostData)
xmlHttp.setRequestHeader "Content-Type", "application/x-www-form-urlencoded"
xmlHttp.setRequestHeader "Referer", RefererUrl
xmlHttp.Send PostData
If Err.Number <> 0 Then
Set xmlHttp=Nothing
PostHttpPage = "$False$"
Exit Function
End If
PostHttpPage=bytesToBSTR(xmlHttp.responseBody,"GB2312")
Set xmlHttp = nothing
End Function