pure asp way to get image width and height

[Nancy Drew]

does anybody know of a way to get an image width and height without using a
custom dll? we have aspJPEG on the server, and there are methods to fetch
image width and height with that, but it only works with JPEG and i need to
get dimensions for gif and png, too.

tks

 

[Maarten]

sub ImgDimension(img)
dim myImg, fs
Set fs= CreateObject("Scripting.FileSystemObject")
if not fs.fileExists(img) then exit sub
set myImg = loadpicture(img)
iWidth = round(myImg.width / 26.4583)
iHeight = round(myImg.height / 26.4583)
iType = myImg.Type
select case iType
case 0
iType = "None"
case 1
iType = "Bitmap"
case 2
iType = "Metafile"
case 3
iType = "Icon"
case 4
iType = "Win32-enhanced metafile"
end select
set myImg = nothing
end sub

 

[Aaron [SQL Server MVP]]

http://www.aspfaq.com/2170

 

[Evertjan.]

Nancy Drew wrote on 28 okt 2004 in
microsoft.public.inetserver.asp.general:

does anybody know of a way to get an image width and height without
using a custom dll? we have aspJPEG on the server, and there are
methods to fetch image width and height with that, but it only works
with JPEG and i need to get dimensions for gif and png, too.

A gif file starts with 6 bytes of header containing something like

Hex 47-49-46-38-39-61

this is the string: "GIF89a"

Then follow 4 bytes [nr 7 to 10], say 17-04-ec-02

Hex 0417 = decimal 1047 pixels width
Hex 02ec = decimal 748 pixels height

reading the file serverside in a byte stream
and parsing these first 10 bytes must give you the picture size.

 

[Maarten]

imgsize.dll is not 100%. We started a project and unfortunaly we must
replace the dll by the script.

 

[Aaron [SQL Server MVP]]

I was recommending the script portion of the article, since the OP asked for
a component-less solution.

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(Reverse address to reply.)

 

[Nancy Drew]

excellent - the code works great. thannks maarten.

 

[trebitzki]

Here is the url to the pure asp solution:

http://www.4guysfromrolla.com/webtech/050300-1.shtml

Just scroll down to the download link and include the file in your project!

Have fun!

Timm

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