Re: Reading image dimensions before it is loaded from a web form using python.
> > Without running some special client-side application, I think you'd > have to do some trickery with the web server involving artificially > stopping the upload after receiving enough bytes to constitute the > image header, and then deciding whether or not to proceed with the > upload at that point. I think that this is definitely nontrivial since > it would most likely involve some hacking of Apache (or whatever web > server you are using). Certainly not. The upload is a simple HTTP POST request, and it's dealt by with your application. For example, you could put a simple CGI script behind a certain url, and once it has read a few bytes or KBytes from stdin, it will test for compliance. Admittedly, most people use some webframework - which usually abstracts away the uploading and passes some file-like object to you when the upload is finished. But then it's an extension to that framework, and given the fact that most of these support out of the box file upload meters, or at least there are recipies how to do so, things should work pretty easy. Diez -- http://mail.python.org/mailman/listinfo/python-list
Re: Reading image dimensions before it is loaded from a web form using python.
On 6/30/07, Cameron Laird <[EMAIL PROTECTED]> wrote: > In article <[EMAIL PROTECTED]>, > Evan Klitzke <[EMAIL PROTECTED]> wrote: > >On 6/30/07, Norman Khine <[EMAIL PROTECTED]> wrote: > >> Hello, > >> I am writing an application using python that allows the user to upload > >> an image to a folder on the server. > >> > >> Is there a way to get the size of the file before it has been uploaded > >> onto the server and give an error if the size does not comply to the > >> maximum size. > > > >The easiest way to do this is to simply restrict the maximum file > >upload size. When the client makes the POST request you can see how > >big it will be. This won't really give you the image dimensions of > >course, but there's no simple way to find out that information without > >uploading the entire image. > . > . > . > Maybe we disagree about "simple", but there *are* definite > ways to do so. It's a bit involved--I fear that when Mr. > Khine writes "image", he might have in mind not just .gif, > .jpg, and .png, but perhaps also SVG, Flash, PDF, ...--but, > yes, it's possible with most image formats to upload just a > small portion of the header and test whether what follows > meets the size requirements. Without running some special client-side application, I think you'd have to do some trickery with the web server involving artificially stopping the upload after receiving enough bytes to constitute the image header, and then deciding whether or not to proceed with the upload at that point. I think that this is definitely nontrivial since it would most likely involve some hacking of Apache (or whatever web server you are using). -- Evan Klitzke <[EMAIL PROTECTED]> -- http://mail.python.org/mailman/listinfo/python-list
Re: Reading image dimensions before it is loaded from a web form using python.
In article <[EMAIL PROTECTED]>, Evan Klitzke <[EMAIL PROTECTED]> wrote: >On 6/30/07, Norman Khine <[EMAIL PROTECTED]> wrote: >> Hello, >> I am writing an application using python that allows the user to upload >> an image to a folder on the server. >> >> Is there a way to get the size of the file before it has been uploaded >> onto the server and give an error if the size does not comply to the >> maximum size. > >The easiest way to do this is to simply restrict the maximum file >upload size. When the client makes the POST request you can see how >big it will be. This won't really give you the image dimensions of >course, but there's no simple way to find out that information without >uploading the entire image. . . . Maybe we disagree about "simple", but there *are* definite ways to do so. It's a bit involved--I fear that when Mr. Khine writes "image", he might have in mind not just .gif, .jpg, and .png, but perhaps also SVG, Flash, PDF, ...--but, yes, it's possible with most image formats to upload just a small portion of the header and test whether what follows meets the size requirements. -- http://mail.python.org/mailman/listinfo/python-list
Re: Reading image dimensions before it is loaded from a web form using python.
On 6/30/07, Norman Khine <[EMAIL PROTECTED]> wrote: > Hello, > I am writing an application using python that allows the user to upload > an image to a folder on the server. > > Is there a way to get the size of the file before it has been uploaded > onto the server and give an error if the size does not comply to the > maximum size. The easiest way to do this is to simply restrict the maximum file upload size. When the client makes the POST request you can see how big it will be. This won't really give you the image dimensions of course, but there's no simple way to find out that information without uploading the entire image. -- Evan Klitzke <[EMAIL PROTECTED]> -- http://mail.python.org/mailman/listinfo/python-list
Reading image dimensions before it is loaded from a web form using python.
Hello, I am writing an application using python that allows the user to upload an image to a folder on the server. Is there a way to get the size of the file before it has been uploaded onto the server and give an error if the size does not comply to the maximum size. So far, my apps loads the image and checks it and then returns an error if the image is too big. Which is a bit pointless in that I should be able to get the file info before it is loaded, but I am not sure where to go. PIL reads the image size before it is loaded, but this is when I run this on my local machine. There is also a post http://mail.python.org/pipermail/python-list/2005-May/323018.html by Will McGugan where he loads 1px and rejects it if its too big. But his apps is an image scraper, so I suppose it fits his use case where he checks the size and then pulls the image if it fits. Anyone with ideas on how to deal with this. Thanks Norman -- http://mail.python.org/mailman/listinfo/python-list
