twisted-Uploading a File

from twisted.web import client

import os, tempfile, webbrowser, random



def encodeForm(inputs):

    """

    Takes a dict of inputs and returns a multipart/form-data string

    containing the utf-8 encoded data. Keys must be strings, values

    can be either strings or file-like objects.

    """

    getRandomChar = lambda: chr(random.choice(range(97, 123)))

    randomChars = [getRandomChar( ) for x in range(20)]

    boundary = "---%s---" % ''.join(randomChars)

    lines = [boundary]

    for key, val in inputs.items( ):

        header = 'Content-Disposition: form-data; name="%s"' % key

        if hasattr(val, 'name'):

            header += '; filename="%s"' % os.path.split(val.name)[1]

        lines.append(header)

        if hasattr(val, 'read'):

            lines.append(val.read( ))

        else:

            lines.append(val.encode('utf-8'))

        lines.append('')

        lines.append(boundary)

    return "\r\n".join(lines)



def showPage(pageData):

    # write data to temp .html file, show file in browser

    tmpfd, tmp = tempfile.mkstemp('.html')

    os.close(tmpfd)

    file(tmp, 'w+b').write(pageData)

    webbrowser.open('file://' + tmp)

    reactor.stop( )



def handleError(failure):

    print "Error:", failure.getErrorMessage( )

    reactor.stop( )



if __name__ == "_ _main_ _":

    import sys

    from twisted.internet import reactor



    filename = sys.argv[1]

    fileToCheck = file(filename)

    form = encodeForm({'uploaded_file': fileToCheck})

    postRequest = client.getPage(

        'http://validator.w3.org/check',

        method='POST',

        headers={'Content-Type': 'multipart/form-data; charset=utf-8',

                 'Content-Length': str(len(form))},

        postdata=form)

    postRequest.addCallback(showPage).addErrback(handleError)

    reactor.run( )

Run validate.py with the name of an HTML file as the first argument:

    $ python validate.py test.html

使用client.getPage可以post表单数据

 关于file函数

file ( filename [, mode [, bufsize ] ] )

Constructor function for the file type, described further in section File Objects. The constructor’s arguments are the same as those of the open() built-in function described below.

When opening a file, it’s preferable to use open() instead of invoking this constructor directly. file is more suited to type testing (for example, writing isinstance(f, file)).