IP地址分段計算 (轉)[@more@]

/* written by Jaron ,2000-01-10 */
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在vbs中沒有位操作，這樣在一個頁面中用到了js和vbs，並不好，如果用vbs也可以，不過羅嗦了一些，而且有一點注意，如果在vbs中split("202.102.29.6",",")，會得到202，102，29三個數，得不到最後一個6，所以需要將ip換成split("202.102.29.6" & ".",",")
我用vbs做的，由於沒有位操作，所以做得比較麻煩
function ip2int(ipstr)
dim iptemp,max
iptemp = split(ipstr&".",".")
max = ubound(iptemp)
if max <> 4 then
exit function
end if

dim a,b,i
a = "&H"
for i = 0 to 3
b = Hex(iptemp(i))
if len(b) = 1 then
b = "0"&b
end if
a = a&b
next
ip2int = CLng(a)
end function

function int2ip(ip)
dim iptemp,a,ipstr,i,length
iptemp = Hex(ip)
length = 8 - len(iptemp)
for i = 1 to length
iptemp = "0" & iptemp
next
a = left(iptemp,2)
a = "&H" & a
i = CInt(a)
a = CStr(i)
ipstr = a & "."
a = mid(iptemp,3,2)
a = "&H" & a
i = CInt(a)
a = CStr(i)
ipstr = ipstr & a & "."
a = mid(iptemp,5,2)
a = "&H" & a
i = CInt(a)
a = CStr(i)
ipstr = ipstr & a & "."
a = right(iptemp,2)
a = "&H" & a
i = CInt(a)
a = CStr(i)
ipstr = ipstr & a
int2ip = ipstr
end function

dim testIP,testInt
testIP="202.102.29.6"
testInt = ip2int(testIP)
response.write testIP & " will be encoded to " & testInt & "
"
response.write testIP & " will be dencoded to " & int2ip(testInt) & "
"
%>