查看完整版本: 利用FSO取得BMP，JPG，PNG，GIF文件信息

利用FSO取得BMP，JPG，PNG，GIF文件信息

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':::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::N,vz"`X:Q
':::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
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'::: BMP, GIF, JPG and PNG :::`t6cSn1r2f?
':::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::9Zx7BHa1c2I6C
'::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::: |'Fn1i~-^?c
'::: :::'B:u LR(b$rl4s
'::: This function gets a specified number of bytes from any :::O)D-k|#c1J
'::: file, starting at the offset (base 1) :::
2Y}eaN*]z n2}u '::: :::]B0D-Z;ZC m|
'::: Passed: :::@j4PMTGM
'::: flnm = Filespec of file to read :::
*D/Cf J&la \9e '::: offset = Offset at which to start reading :::
#~I1d~b ~cp K '::: bytes = How many bytes to read :::
)]bk$x?']z '::: :::
9XDK:{h!]k ':::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::$L&T4yT0e&T6x/t
function GetBytes(flnm, offset, bytes) eh1Xe\RhW1L5`p
Dim objFSO+w&a,R$r/GEMZ
Dim objFTemp(ULQ Rx~
Dim objTextStreamp&o,ofR/vckI%H
Dim lngSize
V/vvK8}
^_C R on error resume next
N"Gg$l,} Set objFSO = CreateObject("Scripting.FileSystemObject") ~,a#FQYx [

Zjh&K LKJ ' First, we get the filesize
V9}7Ee"]bc/^0JT(c Set objFTemp = objFSO.GetFile(flnm)
u!RO0U5G~s lngSize = objFTemp.Size
/n7~g$sTQL`3I,s [ set objFTemp = nothing
5F2D^e'r;}^sDv fsoForReading = 1

Yt8wf$?a3D/p Set objTextStream = objFSO.OpenTextFile(flnm, fsoForReading)V^;m$kui
if offset  0 then
y7[{,q{!E8UvL strBuff = objTextStream.Read(offset - 1)
7xUMcZ4R;]Qz end if
]2KK&pJ,c]'P+y B if bytes = -1 then ' Get All!.L8xK
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GetBytes = objTextStream.Read(lngSize) 'ReadAll
"AOC/M yI+x else
)xd;N4k6?c,V/Wg#@ GetBytes = objTextStream.Read(bytes)9W%kfw|,P\E
end if
u!UH M Q;d j mb objTextStream.Close
DH0?:Z2Qd set objTextStream = nothingUd8^Y
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set objFSO = nothing
d+M ~J_os7w6`k5C end function
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':::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
1~s-K?*klHmL '::: :::o:Fl'e;RX
'::: Functions to convert two bytes to a numeric value (long) :::f#Tc6Q8L*J HZ(i
'::: (both little-endian and big-endian) :::
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w)V:S#B!S '::: :::
:L"B"I~/B8i0x(A ':::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::'u {?.MO})v,d8?dy5E
function lngConvert(strTemp)QN6sczx
lngConvert = clng(asc(left(strTemp, 1))   ((asc(right(strTemp, 1)) * 256)))
O _ i4YGf.|/gZ7Q"? end function)m6HeS?
function lngConvert2(strTemp)v9I.~
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lngConvert2 = clng(asc(right(strTemp, 1))   ((asc(left(strTemp, 1)) * 256)))7nV'N+N\ |'H:T
end function
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':::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
pg2xZh ApLb&C;Pw$R '::: :::o,jof%ulg+P
'::: This function does most of the real work. It will attempt :::
{W2k8@ f r J '::: to read any file, regardless of the extension, and will :::
"zQ'Eb"xC+p@b0bu '::: identify if it is a graphical image. :::
(G~E8u&d+zk b9P '::: :::
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N&Y$@-U-J '::: Passed: :::{L+k1ysLlY
'::: flnm = Filespec of file to read :::)z1{k0wG
'::: width = width of image :::$b/]3iy#ea%j-On
'::: height = height of image :::
v2CSz[8]zgqz '::: depth = color depth (in number of colors) :::
]"_+e:ukY r2h '::: strImageType= type of image (e.g. GIF, BMP, etc.) :::
q!q3f;j @5jZ/\(S '::: :::
h;A ?Ar1g(z-JWI ':::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::h9^
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function gfxSpex(flnm, width, height, depth, strImageType)
2o?;A)?&H#_ dim strPNG 5r&e4[3kN E/g
dim strGIF
-iX N e#[ dim strBMP
_C/{8IG}Ge dim strType
z#bYQ-c"Q strType = ""0@'S'g xJa6iz`~
strImageType = "(unknown)"
;n E4CO%o,cQ gfxSpex = False&^`w s%UqQ}C
strPNG = chr(137)  chr(80)  chr(78)
#{6FgWfT d n strGIF = "GIF"
2I$c p6In!Ii_0Jf strBMP = chr(66)  chr(77)EW!QDG9H
strType = GetBytes(flnm, 0, 3)8AJxIZE y'M
if strType = strGIF then ' is GIF
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|.{JeJ4~ strImageType = "GIF"]fF&u ? }}6@$Y
Width = lngConvert(GetBytes(flnm, 7, 2))a0W3vT
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Height = lngConvert(GetBytes(flnm, 9, 2))^&?
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Depth = 2 ^ ((asc(GetBytes(flnm, 11, 1)) and 7)   1)
5H,q8{2WiY/y5R#}v gfxSpex = Truea%D)z*u{sb
elseif left(strType, 2) = strBMP then ' is BMP/JJ0@1g!a#a(iT
strImageType = "BMP"
^0Gg5ee5l#t*PEi~ Width = lngConvert(GetBytes(flnm, 19, 2))Ci
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Height = lngConvert(GetBytes(flnm, 23, 2))"`
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Depth = 2 ^ (asc(GetBytes(flnm, 29, 1)))
!jj#WL!l@wO BF gfxSpex = True
{QvU/?IT elseif strType = strPNG then ' Is PNG#]sQ!x)Q'UR
strImageType = "PNG"9y^.@{r+Oi
Width = lngConvert2(GetBytes(flnm, 19, 2))
$a2t'W.|z Height = lngConvert2(GetBytes(flnm, 23, 2))
;UEu i,M|?+`2OK Depth = getBytes(flnm, 25, 2)
V?K+L]2epO select case asc(right(Depth,1))_5@:O-kr@D
case 0
Z_C;[9K Depth = 2 ^ (asc(left(Depth, 1)))"gMJFG0@4x
gfxSpex = True5ngWz;r
case 2
v+a1^F:G Bn Depth = 2 ^ (asc(left(Depth, 1)) * 3)
[!y#[ S9SP5E%vQ gfxSpex = True
:P dB6M)z"J case 3
f#qU\e+q Depth = 2 ^ (asc(left(Depth, 1))) '8
8] {&M1Ds2juX hw gfxSpex = True
8Ra d(B\!@6TZ case 4
)U f jF5[,a$^Y$u Depth = 2 ^ (asc(left(Depth, 1)) * 2)R$l!PF X5u%l
gfxSpex = True
bPb#z1PS case 6*m$aN^/I\#XPM
Depth = 2 ^ (asc(left(Depth, 1)) * 4),hIE3s*C!Es&s.LE
gfxSpex = True
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{#d JVn2H5n case else
[ni#gxx0R Depth = -1-| n ct t,X!N3xg
end select  
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.Q1{P8A$tK else,a,w~|[XQc4W
strBuff = GetBytes(flnm, 0, -1) ' Get all bytes from file{*gH0`-|vY\f
lngSize = len(strBuff)
JY
G.S[e%BB R^ flgFound = 0
L Jjvf-E L-O strTarget = chr(255)  chr(216)  chr(255)
E].q+B^ y flgFound = instr(strBuff, strTarget)
'S5\xqEQ-B if flgFound = 0 then
`/l1B iG3\t h'y exit function
`Hx8?0iqR end if
s^"v@_V6J strImageType = "JPG"
^-el#g?m lngPos = flgFound   2ISC2JNhMR%P(]P9z
ExitLoop = false
iMmu`M
v Qy d do while ExitLoop = False and lngPos  lngSize  
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do while asc(mid(strBuff, lngPos, 1)) = 255 and lngPos  lngSizeP[ o4Xy)hI
lngPos = lngPos   1
Pip?#qx#Y loopk4A}'z6OI:c[t
if asc(mid(strBuff, lngPos, 1))  192 or asc(mid(strBuff, lngPos, 1))  195 thenW s l0pTe.q
lngMarkerSize = lngConvert2(mid(strBuff, lngPos   1, 2))l_x`'Wwlo0z
lngPos = lngPos   lngMarkerSize   1c%[qQ9R?9p
elseQG g"e6]!OtP
ExitLoop = True
#I8eBlHf$t end if
lB%i/@eJ5O loop,HtWUI7Z6A
'
A~4Q [8NEStmJ if ExitLoop = False then
)hW(Zt)l)J Width = -1
ht?+yEDxAy Height = -1
hU$h8~,dHx'O}'z Depth = -1
.Zf)rquel else v.K!E&`
v
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Height = lngConvert2(mid(strBuff, lngPos   4, 2))
p`D%`N(oP
Width = lngConvert2(mid(strBuff, lngPos   6, 2))
8lSf(D+z.A3kD2~ Depth = 2 ^ (asc(mid(strBuff, lngPos   8, 1)) * 8)
3g8[$y&e+FiQ gfxSpex = True
,f
W4m^k&l:T,AQK end if
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end if
rD zR8`na'L end function  
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_4fq @)Rw]8D.Z1M!go^/Q
':::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::f!["p1]k_I7b2J
'::: Test Harness :::hO(tU K'?~4f
':::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::#p+Q[8OVd,v4s[
4r `[2G3n7?2Ihj[JY
' To test, we'll just try to show all files with a .GIF extension in the root of C:w!Oa@ t*oiHc3t#B
Set objFSO = CreateObject("Scripting.FileSystemObject"):iYI;x
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Set objF = objFSO.GetFolder("c:\")
2TekJy!c!vx4kF3r Set objFC = objF.Files*ZLXM:L
response.write "table border=""0"" cellpadding=""5"""#M'V8i&g-c3[.}Q
For Each f1 in objFC
\[3k(Q;NI&O6d3yj-B if instr(ucase(f1.Name), ".GIF") thenZA0V.E!py
response.write "trtd"  f1.name  "/tdtd"  f1.DateCreated  "/tdtd"  f1.Size  "/tdtd"*O
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if gfxSpex(f1.Path, w, h, c, strType) = true then
y)i;^G
kg%M&U response.write w  " x "  h  " "  c  " colors",{,SgA3K#V]Z
elsea X_)o$aF^/lR
response.write " "$_!}Pf_
end if2_f+Y4rc:k6G_*g
response.write "/td/tr"&A(vKX7i/w+Z
end ife5oq [8d-\K}
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response.write "/table"/ZT~C
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set objFC = nothing
2M:Q5h Jch)olP set objF = nothing
NW,{.xz+q\:m set objFSO = nothing  
r,~O7~u t (y n1P?-t
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