以下代码主要根据各种图像文件的特征来读取文件的信息。
该程序，利用图像文件，bmp gif jpg png等文件中的固定格式信息，读取文件信息。
该程序还是很有用的，值得珍藏。
<%
"":::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
"":::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
""::: 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(flnm, 23, 2))
Depth = 2 ^ (asc(GetBytes(flnm, 29, 1)))
gfxSpex = True
elseif strType = strPNG then "" Is PNG
strImageType = "PNG"
Width = lngConvert2(GetBytes(flnm, 19, 2))
Height = lngConvert2(GetBytes(flnm, 23, 2))
Depth = getBytes(flnm, 25, 2)
select case asc(right(Depth,1))
case 0
Depth = 2 ^ (asc(left(Depth, 1)))
gfxSpex = True
case 2
Depth = 2 ^ (asc(left(Depth, 1)) * 3)
gfxSpex = True
case 3
Depth = 2 ^ (asc(left(Depth, 1))) ""8
gfxSpex = True
case 4
Depth = 2 ^ (asc(left(Depth, 1)) * 2)
gfxSpex = True
case 6
Depth = 2 ^ (asc(left(Depth, 1)) * 4)
gfxSpex = True
case else
Depth = -1
end select
else
strBuff = GetBytes(flnm, 0, -1) "" Get all bytes from file
lngSize = len(strBuff)
flgFound = 0
strTarget = chr(255) & chr(216) & chr(255)
flgFound = instr(strBuff, strTarget)
if flgFound = 0 then
exit function
end if
strImageType = "JPG"
lngPos = flgFound + 2
ExitLoop = false
do while ExitLoop = False and lngPos < lngSize
do while asc(mid(strBuff, lngPos, 1)) = 255 and lngPos < lngSize
lngPos = lngPos + 1
loop
if asc(mid(strBuff, lngPos, 1)) < 192 or asc(mid(strBuff, lngPos, 1)) > 195 then
lngMarkerSize = lngConvert2(mid(strBuff, lngPos + 1, 2))
lngPos = lngPos + lngMarkerSize + 1
else
ExitLoop = True
end if
loop
""
if ExitLoop = False then
Width = -1
Height = -1
Depth = -1
else
Height = lngConvert2(mid(strBuff, lngPos + 4, 2))
Width = lngConvert2(mid(strBuff, lngPos + 6, 2))
Depth = 2 ^ (asc(mid(strBuff, lngPos + 8, 1)) * 8)
gfxSpex = True
end if
end if
end function
"":::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
""::: Test Harness :::
"":::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
"" To test, we""ll just try to show all files with a .GIF extension in the root of C:
Set objFSO = CreateObject("Scripting.FileSystemObject")
Set objF = objFSO.GetFolder("c:")
Set objFC = objF.Files
response.write "<table border=""0"" cellpadding=""5"">"
For Each f1 in objFC
if instr(ucase(f1.Name), ".GIF") then
response.write "<tr><td>" & f1.name & "</td><td>" & f1.DateCreated & "</td><td>" & f1.Size & "</td><td>"
if gfxSpex(f1.Path, w, h, c, strType) = true then
response.write w & " x " & h & " " & c & " colors"
else
response.write " "
end if
response.write "</td></tr>"
end if
Next
response.write "</table>"
set objFC = nothing
set objF = nothing
set objFSO = nothing
%>
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