Re: upload binary file

On 3/7/06, Tom Lesters <[email protected]> wrote:
>
> Hi All,
>
> Seems upload binary files should be really easy in Quixote,
> There are Upload class,
> But I could not find how to receive, save file in the demo
> Look at the source code, seem it's more about txt file.
> the example on quixote cookbook is out dated: there is no tmp_filename
> anymore:
>
> http://www.quixote..ca/qx/UploadingFiles
> def count (request):
>   upload = request.get_field('file')
>     lines = 0
>     for line in open(upload.tmp_filename, 'r'):
>         lines += 1
>     return "<p>The file is %i lines long." % lines
>
> Anybody can point to me 3-5 line code of checking the binary file size then
> save it ?

To get the file size from a file widget value ('upload' variable):

            pos = upload.fp.tell()  # Save current position in file.
            upload.fp.seek(0, 2)    # Go to end of file.
            size = upload.fp.tell() # Get new position (which is the file size).
            upload.fp.seek(pos, 0)  # Return to previous position.
            upload.size = size
            if size > max_size:
                msg = "The uploaded file is too big (size=%s, max=%s bytes)"
                msg %= (size, max_size)
                raise QueryError(msg)

I've proposed having the Quixote set the size as 'upload.size' for
this purpose, but it hasn't been implemented.

Then to save the upload in a file:

    f = open(DEST_FILENAME, 'wb')
    # Copy file in chunks to avoid using lots of memory.
    while 1:
        chunk = upload.read(1024 * 1024)
        if not chunk:
            break
        out.write(chunk)
    out.close()
    upload.close()

--
Mike Orr <[email protected]>
([email protected] address is semi-reliable)