File size query

[Keltoi]

Is it possible to interogate a files size before uploading?
I know how to find it after the act, but if there is a way to determine the size files to be uploaded before actually uploading then I'd love to know.

TIA

Keltoi
ASP/VBScript

[glenngv]

Are you using a third party upload component or pure vbscript code? Some components already have the feature to check the file size before uploading.

[Roelf]

pssst Glenn, have you read the posting rules you link to:
Signatures should be 4 lines or less

[Keltoi]

I'm using Dimac's W3 Upload, as far as I'm aware there is no such facility in this component

[glenngv]

Originally posted by Roelf
pssst Glenn, have you read the posting rules you link to:
Signatures should be 4 lines or less

Thanks for correcting me

Keltoi, look for other upload components

[[email protected]]

I'm sure that one of ASPUpload / XUpload / JUpload will exceed your requirements!

[Keltoi]

Thanks for your sugestions, yep ASPUpload does seem to do the job.
As I've already coded the page to check file sizes after upload, I think I'll stick with that for now.
However, I know where to go if I should need that function in the future.

Once angain, thanks

[fractalvibes]

I think that in any event, the file size will not be available client-side, but rather not until the form has actually been posted. Whatever component you are using is getting the file size from the HTTP Headers, after it has been sent across the network to the server...

fv

[Keltoi]

Mmm, If that's the case then I'm glad I didn't shell out $149 on ASPUpload

Just in case anyone is reading this thread this is the method I've used to find the file size after upload:

<%
varPath = (Request.ServerVariables("APPL_PHYSICAL_PATH") & "files\")
fileName = [COLOR=darkblue]filenamevariable[/COLOR]
Dim objFSO
Set objFSO = Server.CreateObject("Scripting.FileSystemObject")
Dim objFile
Set objFile = objFSO.GetFile(varPath & fileName)
varSize = objFile.Size
'compare file size in bytes - in this case 250Kb
If varSize > 256000 Then
	'Too big! so lets delete it
	objFSO.DeleteFile varPath & fileName, False
	'Tell the user they're very naughty!
	Response.Write("The File """ & fileName & """ is too big.<br>Please use your browsers back button to try again ensuring the file size is less than 250Kb.<br><br>")&_
	("The file size of " & fileName & " was measured at " & FormatNumber((varSize/1024),2) & "Kb (" & varSize & " bytes)")
	'OK, lets stop processing any more of the page before we get into anymore trouble
	Response.End()
End If
Set objFSO = Nothing
Set objFile = Nothing
%>

Most likly this can be improved on, but hey, it works
----------------
found some more information;
see post on next page

[[email protected]]

Originally posted by fractalvibes
I think that in any event, the file size will not be available client-side, but rather not until the form has actually been posted. Whatever component you are using is getting the file size from the HTTP Headers, after it has been sent across the network to the server...

That's perfectly true if you're using standard form controls, however, if you're coding an IE-only solution then XUpload will restrict filesizes BEFORE upload (see bullet-point no. 15), and even better, JUpload will do it using a Java applet instead (bullet-point 11), for full cross-platform/cross-browser compatibility!!



(But neither are cheap, admittedly...!)

[fractalvibes]

Good point - had forgotten about those. There I think you are talking about a client-side applet/active-x control that can help 'throttle' uploads before they occur. No doubt some $$$$...

fv

[whammy]

Roelf... it's not up to me... but I would give co-moderatorship to glenngv in a second.

I think he should be allowed as long of a signature as he wants, as long as it's not offensive to anyone.

[Roelf]

whammy, i agree with you. But i thought it was rather funny, the way glenn links to the rules, and then not following them himself. So i mentioned it to him in a way that was not offensive (i hope)

[glenngv]

There is a free Pure ASP File Upload that you can try and evaluate. It can check the file size before the actual uploading occurs and most importantly it's free and with no component at all.

whammy, thanks for defending me

Edited. I first posted this without seeing Roelf's post previous to this. I found it not offensive Roelf. But it was really funny I myself broke the rule that I was trying to be linked.

[[email protected]]

Originally posted by glenngv
There is a free Pure ASP File Upload that you can try and evaluate. It can check the file size before the actual uploading occurs and most importantly it's free and with no component at all.

No it can't! As fractalvibes and I have already pointed out between us, that's not possible with the standard form controls, only with 3rd party ActiveX/Java that executes on the client!!



Incidentally, it is possible to do this in IE only by using the Scripting.FileSystemObject or the ADODB.Stream objects in client-side script, but in either case the user will be prompted to authorise the attempt to access the local filesystem, and if client-side scripting is disabled in the browser then the restriction code will be completely ignored! And of course, the restriction code won't work in other browsers anyway!

Furthermore, if he's already using a server-side upload component, why on Earth should he switch to using a pure-script solution that will place a much higher strain on the web server and make the script execute much slower?!!