使用 pdfminer 水平读取 pdf 文件

Question

我想提取带有pdfminer（版本20140328）的pdf。

这是提取pdf的代码：

import sys
from pdfminer.pdfinterp import PDFResourceManager, PDFPageInterpreter
from pdfminer.pdfpage import PDFPage
from pdfminer.converter import XMLConverter, HTMLConverter, TextConverter
from pdfminer.layout import LAParams
from cStringIO import StringIO
import urllib2

def pdf_to_string(data):
    fp = StringIO(data)
    rsrcmgr = PDFResourceManager()
    retstr = StringIO()
    codec = 'utf-8'
    laparams = LAParams()
    device = TextConverter(rsrcmgr, retstr, codec=codec, laparams=laparams)
    # Create a PDF interpreter object.
    interpreter = PDFPageInterpreter(rsrcmgr, device)

    # Process each page contained in the document.
    for page in PDFPage.get_pages(fp):
        interpreter.process_page(page)
        data =  retstr.getvalue()

    return data

pdf_url="http://www.consilium.europa.eu/uedocs/cms_data/docs/pressdata/en/ecofin/140836.pdf"
file_object = urllib2.urlopen(urllib2.Request(pdf_url)).read()
string=pdf_to_string(file_object)

这是pdf的截图：

问题是pdfminer 不是水平读取它（人然后位置）而是在列中（所有人然后他们各自的位置）：

Belgium: 
Mr Koen GEENS 

Bulgaria: 
Mr Petar CHOBANOV 

Czech Republic: 
Mr Radek URBAN 


Minister for Finance, with responsibility for the Civil 
Service 

Minister for Finance 

Deputy Minister for Finance 

如何让pdfminer横向阅读文字？

Answer 1

我通过 pdftotext 找到了一个可行的解决方案：

import tempfile, subprocess

def pdf_to_string(file_object):
    pdfData = file_object.read()
    tf = tempfile.NamedTemporaryFile()
    tf.write(pdfData)
    tf.seek(0)
    outputTf = tempfile.NamedTemporaryFile()

    if (len(pdfData) > 0) :
        out, err = subprocess.Popen(["pdftotext", "-layout", tf.name, outputTf.name ]).communicate()
        return outputTf.read()
    else :
        return None

pdf_file="files/2014_1.pdf"
file_object = file(pdf_file, 'rb')
print pdf_to_string(file_object)

这会产生正确的输出，人名然后是职位:)。

解决了！