c# 使用第三方库pdfbox：
using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Threading.Tasks; using System.IO; using org.apache.pdfbox.pdmodel; using org.apache.pdfbox.util; namespace ReadPDF { class Program { static void Main(string[] args) { string path = string.Format(Environment.CurrentDirectory + "/path/Export_001397_32251.pdf"); Console.WriteLine(pdf2txt(path)); Console.ReadKey(); } public static string pdf2txt(string path) { PDDocument doc = null; try { doc = PDDocument.load(path); PDFTextStripper stripper = new PDFTextStripper(); return stripper.getText(doc); } finally { if (doc != null) { doc.close(); } } } } } 参考地址：http://www.squarepdf.net/how-to-convert-pdf-to-text-in-net-vb python 使用pdflumber或者pdfmine import pdfplumberimport repath = 'path/test.pdf'pdf = pdfplumber.open(path)for page in pdf.pages: print(page.extract_text()) for pdf_table in page.extract_tables(): table = [] cells = [] for row in pdf_table: if not any(row): # 如果一行全为空，则视为一条记录结束 if any(cells): table.append(cells) cells = [] elif all(row): # 如果一行全不为空，则本条为新行，上一条结束 if any(cells): table.append(cells) cells = [] table.append(row) else: if len(cells) == 0: cells = row else: for i in range(len(row)): if row[i] is not None: cells[i] = row[i] if cells[i] is None else cells[i] + row[i] for row in table: print([re.sub('\s+', '', cell) if cell is not None else None for cell in row])pdf.close() import sysimport osfrom binascii import b2a_hex###### pdf-miner requirements###from pdfminer.pdfparser import PDFParserfrom pdfminer.pdfdocument import PDFDocument, PDFNoOutlinesfrom pdfminer.pdfpage import PDFPagefrom pdfminer.pdfinterp import PDFResourceManager, PDFPageInterpreterfrom pdfminer.converter import PDFPageAggregatorfrom pdfminer.layout import LAParams, LTTextBox, LTTextLine, LTFigure, LTImage, LTChardef with_pdf (pdf_doc, fn, pdf_pwd, *args): """Open the pdf document, and apply the function, returning the results""" result = None try: # open the pdf file fp = open(pdf_doc, 'rb') # create a parser object associated with the file object parser = PDFParser(fp) # create a PDFDocument object that stores the document structure doc = PDFDocument(parser, pdf_pwd) # connect the parser and document objects parser.set_document(doc) # supply the password for initialization if doc.is_extractable: # apply the function and return the result result = fn(doc, *args) # close the pdf file fp.close() except IOError: # the file doesn't exist or similar problem pass return result ### ### Table of Contents ###def _parse_toc (doc): """With an open PDFDocument object, get the table of contents (toc) data [this is a higher-order function to be passed to with_pdf()]""" toc = [] try: outlines = doc.get_outlines() for (level,title,dest,a,se) in outlines: toc.append( (level, title) ) except PDFNoOutlines: pass return tocdef get_toc (pdf_doc, pdf_pwd=''): """Return the table of contents (toc), if any, for this pdf file""" return with_pdf(pdf_doc, _parse_toc, pdf_pwd)###### Extracting Images###def write_file (folder, filename, filedata, flags='w'): """Write the file data to the folder and filename combination (flags: 'w' for write text, 'wb' for write binary, use 'a' instead of 'w' for append)""" result = False if os.path.isdir(folder): try: file_obj = open(os.path.join(folder, filename), flags) file_obj.write(filedata) file_obj.close() result = True except IOError: pass return resultdef determine_image_type (stream_first_4_bytes): """Find out the image file type based on the magic number comparison of the first 4 (or 2) bytes""" file_type = None bytes_as_hex = b2a_hex(stream_first_4_bytes) if bytes_as_hex.startswith('ffd8'): file_type = '.jpeg' elif bytes_as_hex == '89504e47': file_type = '.png' elif bytes_as_hex == '47494638': file_type = '.gif' elif bytes_as_hex.startswith('424d'): file_type = '.bmp' return file_typedef save_image (lt_image, page_number, images_folder): """Try to save the image data from this LTImage object, and return the file name, if successful""" result = None if lt_image.stream: file_stream = lt_image.stream.get_rawdata() if file_stream: file_ext = determine_image_type(file_stream[0:4]) if file_ext: file_name = ''.join([str(page_number), '_', lt_image.name, file_ext]) if write_file(images_folder, file_name, file_stream, flags='wb'): result = file_name return result###### Extracting Text###def to_bytestring (s, enc='utf-8'): """Convert the given unicode string to a bytestring, using the standard encoding, unless it's already a bytestring""" if s: if isinstance(s, str): return s else: return s.encode(enc)def update_page_text_hash (h, lt_obj, pct=0.2): """Use the bbox x0,x1 values within pct% to produce lists of associated text within the hash""" x0 = lt_obj.bbox[0] x1 = lt_obj.bbox[2] key_found = False for k, v in h.items(): hash_x0 = k[0] if x0 >= (hash_x0 * (1.0-pct)) and (hash_x0 * (1.0+pct)) >= x0: hash_x1 = k[1] if x1 >= (hash_x1 * (1.0-pct)) and (hash_x1 * (1.0+pct)) >= x1: # the text inside this LT* object was positioned at the same # width as a prior series of text, so it belongs together key_found = True v.append(to_bytestring(lt_obj.get_text())) h[k] = v if not key_found: # the text, based on width, is a new series, # so it gets its own series (entry in the hash) h[(x0,x1)] = [to_bytestring(lt_obj.get_text())] return hdef parse_lt_objs (lt_objs, page_number, images_folder, text=[]): """Iterate through the list of LT* objects and capture the text or image data contained in each""" text_content = [] page_text = {} # k=(x0, x1) of the bbox, v=list of text strings within that bbox width (physical column) for lt_obj in lt_objs: if isinstance(lt_obj, LTTextBox) or isinstance(lt_obj, LTTextLine): # text, so arrange is logically based on its column width page_text = update_page_text_hash(page_text, lt_obj) elif isinstance(lt_obj, LTImage): # an image, so save it to the designated folder, and note its place in the text saved_file = save_image(lt_obj, page_number, images_folder) if saved_file: # use html style <img /> tag to mark the position of the image within the text text_content.append('<img src="'+os.path.join(images_folder, saved_file)+'" />') else: print >> sys.stderr, "error saving image on page", page_number, lt_obj.__repr__ elif isinstance(lt_obj, LTFigure): # LTFigure objects are containers for other LT* objects, so recurse through the children text_content.append(parse_lt_objs(lt_obj, page_number, images_folder, text_content)) for k, v in sorted([(key,value) for (key,value) in page_text.items()]): # sort the page_text hash by the keys (x0,x1 values of the bbox), # which produces a top-down, left-to-right sequence of related columns text_content.append(''.join(v)) return '\n'.join(text_content)###### Processing Pages###def _parse_pages (doc, images_folder): """With an open PDFDocument object, get the pages and parse each one [this is a higher-order function to be passed to with_pdf()]""" rsrcmgr = PDFResourceManager() laparams = LAParams() device = PDFPageAggregator(rsrcmgr, laparams=laparams) interpreter = PDFPageInterpreter(rsrcmgr, device) text_content = [] for i, page in enumerate(PDFPage.create_pages(doc)): interpreter.process_page(page) # receive the LTPage object for this page layout = device.get_result() # layout is an LTPage object which may contain child objects like LTTextBox, LTFigure, LTImage, etc. text_content.append(parse_lt_objs(layout, (i+1), images_folder)) return text_contentdef get_pages (pdf_doc, pdf_pwd='', images_folder='/tmp'): """Process each of the pages in this pdf file and return a list of strings representing the text found in each page""" return with_pdf(pdf_doc, _parse_pages, pdf_pwd, *tuple([images_folder]))a = open('path/a.txt','a')for i in get_pages('path/Export_001397_32251.pdf'): a.write(i) print(i)a.close()
转载于:https://www.cnblogs.com/ganzhihui/p/11543920.html
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