codice:
Pagina clsImageSize.asp:
<%
'******************************************************************
' Classe ImageSize
' Data una immagine restituisce le dimensioni X,Y e numero di
' colori
'
' Proprietà:
' ImageFile = path fisico completo dell'immagine
' ImageName = restituisce il nome del file
' ImageType = restituisce il tipo di immagine
' ImageWidth = restituisce la larghezza in pixel dell'immagine
' ImageHeight = restituisce l'altezza in pixel dell'immagine
' ImageDepth = restituisce il numero di colori dell'immagine
' IsImage = restituisce TRUE se il file è una immagine
'
' Author:
' 2002 Luciani Massimiliano
' http://www.byluciani.com
' webmaster@byluciani.com
'
' Original code:
' http://www.4guysfromrolla.com/webtech/011201-1.shtml
' Author: Mike Shaffer - mshaffer@nkn.net
'
' This script is FREEWARE
'******************************************************************
Class ImageSize
Public Dimensioni(2)
Public bolIsImage, strPathFile, strImageType
Private Sub Class_Initialize()
End Sub
Private Sub Class_Terminate()
End Sub
Public Property Get ImageName
ImageName = doName(ImageFile)
End Property
Public Property Get ImageFile
ImageFile = strPathFile
End Property
Public Property Let ImageFile(strImageFile)
strPathFile = strImageFile
gfxSpex(strPathFile)
End Property
Public Property Get ImageWidth
ImageWidth = Dimensioni(0)
End Property
Public Property Get ImageHeight
ImageHeight = Dimensioni(1)
End Property
Public Property Get ImageDepth
ImageDepth = Dimensioni(2)
End Property
Public Property Get ImageType
ImageType = strImageType
End Property
Public Property Get IsImage
IsImage = bolIsImage
End Property
Public 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
Public function lngConvert(strTemp)
lngConvert = clng(asc(left(strTemp, 1)) + ((asc(right(strTemp, 1)) * 256)))
end function
Public function lngConvert2(strTemp)
lngConvert2 = clng(asc(right(strTemp, 1)) + ((asc(left(strTemp, 1)) * 256)))
end function
Public Sub gfxSpex(flnm)
dim strPNG
dim strGIF
dim strBMP
dim strType
strType = ""
strImageType = "(unknown)"
bolIsImage = 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"
lngWidth = lngConvert(GetBytes(flnm, 7, 2))
lngHeight = lngConvert(GetBytes(flnm, 9, 2))
lngDepth = 2 ^ ((asc(GetBytes(flnm, 11, 1)) and 7) + 1)
bolIsImage = True
elseif left(strType, 2) = strBMP then ' is BMP
strImageType = "BMP"
lngWidth = lngConvert(GetBytes(flnm, 19, 2))
lngHeight = lngConvert(GetBytes(flnm, 23, 2))
lngDepth = 2 ^ (asc(GetBytes(flnm, 29, 1)))
bolIsImage = True
elseif strType = strPNG then ' Is PNG
strImageType = "PNG"
lngWidth = lngConvert2(GetBytes(flnm, 19, 2))
lngHeight = lngConvert2(GetBytes(flnm, 23, 2))
lngDepth = getBytes(flnm, 25, 2)
select case asc(right(lngDepth,1))
case 0
lngDepth = 2 ^ (asc(left(lngDepth, 1)))
bolIsImage = True
case 2
lngDepth = 2 ^ (asc(left(lngDepth, 1)) * 3)
bolIsImage = True
case 3
lngDepth = 2 ^ (asc(left(lngDepth, 1))) '8
bolIsImage = True
case 4
lngDepth = 2 ^ (asc(left(lngDepth, 1)) * 2)
bolIsImage = True
case 6
lngDepth = 2 ^ (asc(left(lngDepth, 1)) * 4)
bolIsImage = True
case else
lngDepth = -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 sub
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
lngWidth = -1
lngHeight = -1
lngDepth = -1
else
lngHeight = lngConvert2(mid(strBuff, lngPos + 4, 2))
lngWidth = lngConvert2(mid(strBuff, lngPos + 6, 2))
lngDepth = 2 ^ (asc(mid(strBuff, lngPos + 8, 1)) * 8)
bolIsImage = True
end if
end if
Dimensioni(0) = lngHeight
Dimensioni(1) = lngWidth
Dimensioni(2) = lngDepth
end Sub
Public Function doName(strPath)
Dim arrSplit
arrSplit = Split(strPath, "\")
doName = arrSplit(UBound(arrSplit))
End Function
End Class
%>
---------------------
<%
'*********************************************
' example to use class: clsImageSize
'
' 2002 Luciani Massimiliano
' http://www.byluciani.com
' webmaster@byluciani.com
'
' This script is FREEWARE
'*********************************************
%>
<%
Set objImageSize = New ImageSize
With objImageSize
.ImageFile = Server.MapPath("logo_byluciani.gif")
If .IsImage Then
Response.Write "Path: " & .ImageFile & "
"
Response.Write "Name: " & .ImageName & "
"
Response.Write "Type: " & .ImageType & "
"
Response.Write "X: " & .ImageWidth & "
"
Response.Write "Y: " & .ImageHeight & "
"
Response.Write "Colors: " & .ImageDepth & "
"
Else
Response.Write "Name: " & .ImageName & "
"
Response.Write "it isn't an image"
End If
End With
Set objImageSize = Nothing
%>
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