Uploading Images In ColdFusion

[mdumka]

I would like a little help from you fine folks here

I know how to upload images, rename them and place them in directorys.

What I would like to is befor I upload them Check thier extension, file size and dimernsions in that order of importance.

Is this possible?

I have been searching but with no luck,

Thanks

[Rynoguill]

youre talking about mime types, i dont use them much so i cant tell you what you need off the top of my head. i think davidjmedlock has helped me with something like this before, hopefully he will stop by here soon.

if i can come up with that previous post ill let you know, i cant seem to find it so far though.

[Rynoguill]

found it, check this thread out.

http://www.sitepoint.com/forums/show...highlight=mime

[jonese]

sounds like you are dealing with images (dimension?) have you looked into image Magik? there's a cool CF tag at http://www.alagad.com/index.cfm/name-mtinfo and it's free!

[mdumka]

Thanks buddy, I dont want to change the file, just want to restrict them from uploading anything but .jpg.

I think I am going to try and use some error handling using the file .extensions.

Later

[davidjmedlock]

Originally Posted by jonese

sounds like you are dealing with images (dimension?) have you looked into image Magik? there's a cool CF tag at http://www.alagad.com/index.cfm/name-mtinfo and it's free!

I believe that requires the ImageMagik program to be installed on the server. Some shared hosts don't like doing that kind of thing, though they may work with you if you threaten to take your business elsewhere...

Here's an article on File Uploads:

http://www.kodefusion.com/article/in...d&ArticleID=13

To check for image MIME types, you want to use the "accept" attribute of CFFILE. You would enter a comma delimited list of MIME types you're willing to allow users to upload and then ColdFusion would automatically accept or reject it based on the file type. For images you might specify "image/jpeg,image/pjpeg,image/gif,image/png,image/bmp". You might be able to specify "image/*", but I'm not 100% sure.

Also, look at my latest article on SitePoint about using HTTP with ColdFusion. There's some code in there for a simple Image server that you might find useful.

[mdumka]

Well What I did is download the imageinfo custom tag from Macromedia (it is free) to give the information of file type, file size and dimensions.

I know File.ServerFile and other functions would have got me the extension and size fo the file but no dimensions so I am using this.

My logic is 2 upload to a temp directory, check the the file to see if it fits my rule for size, dimensions and ext. If it does, rename it and upload it to my directory, if it does not, store the value of size, dimensions and ext in a variable, delete the temp file and display the error to the user.

Does this sound like the right logic to use?

Thanks

Mike

[creole]

mdumka...

Care to share that custom tag?

[davidjmedlock]

Originally Posted by mdumka

Well What I did is download the imageinfo custom tag from Macromedia (it is free) to give the information of file type, file size and dimensions.

I know File.ServerFile and other functions would have got me the extension and size fo the file but no dimensions so I am using this.

My logic is 2 upload to a temp directory, check the the file to see if it fits my rule for size, dimensions and ext. If it does, rename it and upload it to my directory, if it does not, store the value of size, dimensions and ext in a variable, delete the temp file and display the error to the user.

Does this sound like the right logic to use?

Thanks

Mike

Yeah, thats about right. I think that's pretty much exactly what I did on ezImageCenter.us. Just be sure to use the accept attribute to keep someone from uploading an exe and blowing up your app or something...

[mdumka]

Thanks guys, will up the tag on monday!

Later

[mdumka]

Here is the ImageInfo custom tag.

Later

[mdumka]

why is the upload not showing?

If I go to edit my post it shows it uploaded but not in my post. Help?

[creole]

It hasn't been approved yet. An admin has to look it over before it gets made public.

[mdumka]

Originally Posted by creole

It hasn't been approved yet. An admin has to look it over before it gets made public.

Ok, thanks buddy. Well when it is given the A-OK the tag is there for ya.

Later

[creole]

Great...can't wait to get it.

[lostfox]

there may be a better way but here's how i do it
i actually upload the file, check its extension and delete it if its not an acceptable image file(gif and .jpg)

<cfif #cffile.ClientFileExt# EQ 'gif' OR #cffile.ClientFileExt# EQ 'jpg' OR #cffile.ClientFileExt# EQ 'pjpeg' OR #cffile.ClientFileExt# EQ 'jpeg' OR #cffile.ClientFileExt# EQ 'pjpg'>

i havn't had any speed issues with this process yet. if anybody has a better idea, i could use this tip too

[mdumka]

but how do you check dimensions?

I ask this becuase sometimes I have to ensure my users do not upload the wrong size images.

[creole]

lostfox...

Why take the time to make that check when you can simply prevent users from uploading a file type that you don't want to begin with? Like so:

<cffile

action="upload"

fileField="uploadbanner"

destination="#uploadPath#"

nameConflict="MakeUnique"

accept="image/gif,image/jpeg,image/pjpeg"> 

[lostfox]

PHP:

<cffile
action="upload"
fileField="uploadbanner"
destination="#uploadPath#"
nameConflict="MakeUnique"
accept="image/gif,image/jpeg,image/pjpeg">

i do it that my way because if they try to upload file with an unacceptable extension, the user gets a coldfusion error. with the way i do it, i can print out a "hey you tried to upload an unacceptable file" message to them along with instructions of what to do next. i don't know how common this is, but i try to keep the user from getting the coldfusion errors

[duncancumming]

Originally Posted by lostfox

i do it that my way because if they try to upload file with an unacceptable extension, the user gets a coldfusion error. with the way i do it, i can print out a "hey you tried to upload an unacceptable file" message to them along with instructions of what to do next. i don't know how common this is, but i try to keep the user from getting the coldfusion errors

wouldn't you be better to put the <cffile> in a <cftry> block, then <cfcatch> the error?

[Rynoguill]

Originally Posted by duncancumming

wouldn't you be better to put the <cffile> in a <cftry> block, then <cfcatch> the error?

you really need to use the cftry and catch blocks around things like that, its a much better way to do it. for you and the user. and, i dont know if this is true in your case, but if youre working with files that could possibly be used at the same time (or try to be), or if two people my be trying to upload pictures with the same name at the same time, you need to use locks around the cffile as well. its called race conditions, and i think ben forta's blog has some more info about it. you may actually want to get in the cf documentation too though.

[creole]

Good point Lostfox...thanks for clarifying.

[lostfox]

The next time i have the chance, i will give the cftry and cfcatch a go. that is the first that i've heard of it. when i started the project in which used the above code, i did a quick look into a try/catch type of functions but quickly gave up and decided i could write the code to upload and delete it just as easily.

thanks for the tip.

[Rynoguill]

Originally Posted by lostfox

The next time i have the chance, i will give the cftry and cfcatch a go. that is the first that i've heard of it. when i started the project in which used the above code, i did a quick look into a try/catch type of functions but quickly gave up and decided i could write the code to upload and delete it just as easily.

thanks for the tip.

yes definately look into it. its not hard, im sure youll pick it up quite easily, and it really has a lot of power if youre interested in tapping into it. let us know if you have any trouble with it.