image sizes

[benbacardi]

is there anyway, using standard ASP/VBScript, to just determine the width n height of an image, not to do anything with it? just to get the dimensions?

[Webforumz Staff]

http://www.4guysfromrolla.com/webtech/050300-1.shtml
http://www.aspfaq.com/show.asp?id=2170

[benbacardi]

Thanks Catalyst - having problems though!!

This is the code i'm using:

Code: Select all

<%
Dim HW

Function AscAt(s, n)
       AscAt = Asc(Mid(s, n, 1))
End Function

Function HexAt(s, n)
       HexAt = Hex(AscAt(s, n))
End Function


Function isJPG(fichero)
       If inStr(uCase(fichero), ".JPG") <> 0 Then
       isJPG = true
       Else
       isJPG = false
       End If
End Function


Function isPNG(fichero)
       If inStr(uCase(fichero), ".PNG") <> 0 Then
       isPNG = true
       Else
       isPNG = false
       End If
End Function


Function isGIF(fichero)
       If inStr(uCase(fichero), ".GIF") <> 0 Then
       isGIF = true
       Else
       isGIF = false
       End If
End Function


Function isBMP(fichero)
       If inStr(uCase(fichero), ".BMP") <> 0 Then
       isBMP = true
       Else
       isBMP = false
       End If
End Function


Function isWMF(fichero)
       If inStr(uCase(fichero), ".WMF") <> 0 Then
       isWMF = true
       Else
       isWMF = false
       End If
End Function


Function isWebImg(f)
       If isGIF(f) Or isJPG(f) Or isPNG(f) Or isBMP(f) Or isWMF(f) Then
       isWebImg = true
       Else
       isWebImg = true
       End If
End Function


Function ReadImg(fichero)
       If isGIF(fichero) Then
       ReadImg = ReadGIF(fichero)
       Else
       If isJPG(fichero) Then
       ReadImg = ReadJPG(fichero)
       Else
       If isPNG(fichero) Then
       ReadImg = ReadPNG(fichero)
       Else
       If isBMP(fichero) Then
       ReadImg = ReadPNG(fichero)
       Else
       If isWMF(fichero) Then
       ReadImg = ReadWMF(fichero)
       Else
       ReadImg = Array(0,0)
       End If
       End If
       End If
       End If
       End If
End Function


Function ReadJPG(fichero)
    Dim fso, ts, s, HW, nbytes
       HW = Array("","")
       Set fso = CreateObject("Scripting.FileSystemObject")
       Set ts = fso.OpenTextFile(fichero, 1)
       s = Right(ts.Read(167), 4)
       HW(0) = HexToDec(HexAt(s,3) & HexAt(s,4))
       HW(1) = HexToDec(HexAt(s,1) & HexAt(s,2))
       ts.Close
    ReadJPG = HW
End Function


Function ReadPNG(fichero)
    Dim fso, ts, s, HW, nbytes
       HW = Array("","")
       Set fso = CreateObject("Scripting.FileSystemObject")
       Set ts = fso.OpenTextFile(Server.MapPath("/" & fichero), 1)
       s = Right(ts.Read(24), 8)
       HW(0) = HexToDec(HexAt(s,3) & HexAt(s,4))
       HW(1) = HexToDec(HexAt(s,7) & HexAt(s,8))
       ts.Close
    ReadPNG = HW
End Function


Function ReadGIF(fichero)
    Dim fso, ts, s, HW, nbytes
       HW = Array("","")
       Set fso = CreateObject("Scripting.FileSystemObject")
       Set ts = fso.OpenTextFile(Server.MapPath("/" & fichero), 1)
       s = Right(ts.Read(10), 4)
       HW(0) = HexToDec(HexAt(s,2) & HexAt(s,1))
       HW(1) = HexToDec(HexAt(s,4) & HexAt(s,3))
       ts.Close
    ReadGIF = HW
End Function


Function ReadWMF(fichero)
    Dim fso, ts, s, HW, nbytes
       HW = Array("","")
       Set fso = CreateObject("Scripting.FileSystemObject")
       Set ts = fso.OpenTextFile(Server.MapPath("/" & fichero), 1)
       s = Right(ts.Read(14), 4)
       HW(0) = HexToDec(HexAt(s,2) & HexAt(s,1))
       HW(1) = HexToDec(HexAt(s,4) & HexAt(s,3))
       ts.Close
    ReadWMF = HW
End Function


Function ReadBMP(fichero)
    Dim fso, ts, s, HW, nbytes
       HW = Array("","")
       Set fso = CreateObject("Scripting.FileSystemObject")
       Set ts = fso.OpenTextFile(Server.MapPath("/" & fichero), 1)
       s = Right(ts.Read(24), 8)
       HW(0) = HexToDec(HexAt(s,4) & HexAt(s,3))
       HW(1) = HexToDec(HexAt(s,8) & HexAt(s,7))
       ts.Close
    ReadBMP = HW
End Function


Function isDigit(c)
       If inStr("0123456789", c) <> 0 Then
       isDigit = true
       Else
       isDigit = false
       End If
End Function


Function isHex(c)
       If inStr("0123456789ABCDEFabcdef", c) <> 0 Then
       isHex = true
       Else
       ishex = false
       End If
End Function


Function HexToDec(cadhex)
       Dim n, i, ch, decimal
       decimal = 0
       n = Len(cadhex)
       For i=1 To n
       ch = Mid(cadhex, i, 1)
       If isHex(ch) Then
       decimal = decimal * 16
       If isDigit(c) Then
       decimal = decimal + ch
       Else
       decimal = decimal + Asc(uCase(ch)) - Asc("A")
       End If
       Else
       HexToDec = -1
       End If
       Next
       HexToDec = decimal
End Function

graphic=Server.MapPath(".") & "\portfolio\centrefed2.jpg"
HW = ReadImg(graphic)
Response.Write graphic & " Dimensions: " & HW(0) & "x" & HW(1) & "
"

%>

If i send it the file above, which i know is 100px x 100px, i get the following:

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c:\websites\free\bpcu\www\outrage\portfolio\centrefed2.jpg Dimensions: 12336x50

and if i send it a larger picture:

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graphic=Server.MapPath(".") & "\portfolio\large\centrefed2.jpg"

i get the following:

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Microsoft VBScript runtime  error '800a000d'

Type mismatch: 'ch'

/outrage/portfolio.asp, line 194

can you help?

[Webforumz Staff]

On the page with the link to the code you used: http://www.aspfaq.com/show.asp?id=2170

There's a correction to 2 functions below that link. I'd try putting those in to replace the original ones you're using as they're related to the 2 parts of code you're having trouble with.

[benbacardi]

thanks catalyst - i was actualy using that code, but that didnt work either. in the end im passing the image name to a php page i have on a different server that does the work for me, then sending the answers back.

[Webforumz Staff]

Oh ok. I looked at the code you'd pasted and it wasn't the corrected one so I thought maybe you'd missed that.