利用FSO取得BMP，JPG，PNG，GIF文件信息

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''::: BMP, GIF, JPG and PNG :::
''::::原作:junyd:::::::::::
'':::::翻译:欧阳东杰::::::::::::::::::::::::::::::::::::::::::
''::: :::
''::: 这个东东能从BMP, GIF, JPG and PNG 图片拿到这个文件得字节 :::
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function GetBytes(flnm, offset, bytes)
Dim objFSO
Dim objFTemp
Dim objTextStream
Dim lngSize
on error resume next
Set objFSO = CreateObject("Scripting.FileSystemObject")

'' 首先，我们得到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

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''::: :::
''::: 下面是把两个字节转化成统一数值的的功能 :::
''::: (小endian 和大的endian ) :::
''::: :::
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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

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''::: :::
''::: 这个功能做大多数真正的工作。 它意愿尝试 :::
''::: 读任何文件:::
''::: 如果它是一幅图表的图像，鉴定 . :::
''::: :::
''::: 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.) :::
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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 = l