ASP FSO相关的一些例子

<%
"::: BMP, GIF, JPG and PNG :::

"::: This function gets a specified number of bytes from any :::
"::: file, starting at the offset (base 1) :::
"::: :::
"::: Passed: :::
"::: flnm => Filespec of file to read :::
"::: offset => Offset at which to start reading :::
"::: bytes => How many bytes to read :::
"::: :::
":::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
function GetBytes(flnm, offset, bytes)
Dim objFSO
Dim objFTemp
Dim objTextStream
Dim lngSize
on error resume next
Set objFSO = CreateObject("Scripting.FileSystemObject")

" First, we get the filesize
Set objFTemp = objFSO.GetFile(flnm)
lngSize = objFTemp.Size
set objFTemp = nothing
fsoForReading = 1
Set objTextStream = objFSO.OpenTextFile(flnm, fsoForReading)
if offset > 0 then
strBuff = objTextStream.Read(offset - 1)
end if
if bytes = -1 then " Get All!
GetBytes = objTextStream.Read(lngSize) "ReadAll
else
GetBytes = objTextStream.Read(bytes)
end if
objTextStream.Close
set objTextStream = nothing
set objFSO = nothing
end function

":::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
"::: :::
"::: Functions to convert two bytes to a numeric value (long) :::
"::: (both little-endian and big-endian) :::
"::: :::
":::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
function lngConvert(strTemp)
lngConvert = clng(asc(left(strTemp, 1)) + ((asc(right(strTemp, 1)) * 256)))
end function
function lngConvert2(strTemp)
lngConvert2 = clng(asc(right(strTemp, 1)) + ((asc(left(strTemp, 1)) * 256)))
end function

":::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
"::: :::
"::: This function does most of the real work. It will attempt :::
"::: to read any file, regardless of the extension, and will :::
"::: identify if it is a graphical image. :::
"::: :::
"::: Passed: :::
"::: flnm => Filespec of file to read :::
"::: width => width of image :::
"::: height => height of image :::
"::: depth => color depth (in number of colors) :::
"::: strImageType=> type of image (e.g. GIF, BMP, etc.) :::
"::: :::
":::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
function gfxSpex(flnm, width, height, depth, strImageType)
dim strPNG
dim strGIF
dim strBMP
dim strType
strType = ""
strImageType = "(unknown)"
gfxSpex = False
strPNG = chr(137) & chr(80) & chr(78)
strGIF = "GIF"
strBMP = chr(66) & chr(77)
strType = GetBytes(flnm, 0, 3)
if strType = strGIF then " is GIF
strImageType = "GIF"
Width = lngConvert(GetBytes(flnm, 7, 2))
Height = lngConvert(GetBytes(flnm, 9, 2))
Depth = 2 ^ ((asc(GetBytes(flnm, 11, 1)) and 7) + 1)
gfxSpex = True
elseif left(strType, 2) = strBMP then " is BMP
strImageType = "BMP"
Width = lngConvert(GetBytes(flnm, 19, 2))
Height = lngConvert(GetBytes(fl