Django的ReportLab的错误 - “海峡”对象有没有属性“getKeepWithNext”

Question

即时得到错误 - “海峡”对象有没有属性“getKeepWithNext”试图将图像添加到PDF IM生成使用ReportLab的

林时Djnago 1.6。

这里是我的文件

printing.py

import os.path 
from reportlab.lib.pagesizes import letter, A4 
from reportlab.platypus import SimpleDocTemplate, Paragraph, Image 
from reportlab.lib.styles import getSampleStyleSheet, ParagraphStyle 
from reportlab.pdfgen import canvas 
from reportlab.lib.units import mm 
from reportlab.lib.units import inch 
from reportlab.lib.enums import TA_CENTER 
from reportlab.lib.enums import TA_RIGHT 
from reportlab.pdfbase import pdfmetrics 
from reportlab.pdfbase.ttfonts import TTFont 
from django.conf import settings 

from catalog.models import Product 

class MyPrint: 
    def __init__(self, buffer, pagesize): 
     self.buffer = buffer 
     if pagesize == 'A4': 
      self.pagesize = A4 
     elif pagesize == 'Letter': 
      self.pagesize = letter 
     self.width, self.height = self.pagesize 

    @staticmethod 
    def _header_footer(canvas, doc): 
     # Save the state of our canvas so we can draw on it 
     canvas.saveState() 
     styles = getSampleStyleSheet() 

     # Header 
     header = Paragraph('This is a multi-line header. It goes on every page. ' * 5, styles['Normal']) 
     w, h = header.wrap(doc.width, doc.topMargin) 
     header.drawOn(canvas, doc.leftMargin, doc.height + doc.topMargin - h) 

     # Footer 
     footer = Paragraph('This is a multi-line footer. It goes on every page. ' * 5, styles['Normal']) 
     w, h = footer.wrap(doc.width, doc.bottomMargin) 
     footer.drawOn(canvas, doc.leftMargin, h) 

     # Release the canvas 
     canvas.restoreState() 


    def print_products(self): 
     buffer = self.buffer 
     doc = SimpleDocTemplate(buffer, 
           rightMargin=inch/4, 
           leftMargin=inch/4, 
           topMargin=inch/2, 
           bottomMargin=inch/4, 
           pagesize=self.pagesize) 

     # Our container for 'Flowable' objects 
     elements = [] 

     # A large collection of style sheets pre-made for us 
     styles = getSampleStyleSheet() 
     styles.add(ParagraphStyle(name='centered', alignment=TA_CENTER)) 
     styles.add(ParagraphStyle(name='RightAlign', fontName='Arial', align=TA_RIGHT)) 

     # Draw things on the PDF. Here's where the PDF generation happens. 
     # See the ReportLab documentation for the full list of functionality. 
     products = Product.objects.all() 
     elements.append(Paragraph('My Products', styles['Heading1'])) 

     elements.append('<img src="el45.jpg" height="5">') 


     for i, product in enumerate(products): 
      elements.append(Paragraph(product.info(), styles['Normal'])) 

     doc.build(elements, onFirstPage=self._header_footer, onLaterPages=self._header_footer, canvasmaker=NumberedCanvas) 

     # Get the value of the BytesIO buffer and write it to the response. 
     pdf = buffer.getvalue() 
     buffer.close() 
     return pdf 

class NumberedCanvas(canvas.Canvas): 
    def __init__(self, *args, **kwargs): 
     canvas.Canvas.__init__(self, *args, **kwargs) 
     self._saved_page_states = [] 

    def showPage(self): 
     self._saved_page_states.append(dict(self.__dict__)) 
     self._startPage() 

    def save(self): 
     """add page info to each page (page x of y)""" 
     num_pages = len(self._saved_page_states) 
     for state in self._saved_page_states: 
      self.__dict__.update(state) 
      self.draw_page_number(num_pages) 
      canvas.Canvas.showPage(self) 
     canvas.Canvas.save(self) 

    def draw_page_number(self, page_count): 
     # Change the position of this to wherever you want the page number to be 
     self.drawRightString(211 * mm, 15 * mm + (0.2 * inch), 
          "Page %d of %d" % (self._pageNumber, page_count)) 

views.py

def print_products(request): 
    # Create the HttpResponse object with the appropriate PDF headers. 
    response = HttpResponse(content_type='application/pdf') 
    response['Content-Disposition'] = 'filename="Product.pdf"' 

    buffer = BytesIO() 

    report = MyPrint(buffer, 'Letter') 
    pdf = report.print_products() 

    response.write(pdf) 
    return response 

我的图像文件在同一目录中这两个文件。

Answer 1

您只能将reportlab的Flowable添加到故事中。如果要附加图像，您必须将ReportLab的方式做到这一点：

变化

elements.append('<img src="el45.jpg" height="5">')

到

elements.append(Image('el45.jpg', width=None, height=5))

您有宽度和高度参数玩。此外，你应该总是将大小乘以想要的单位，例如5*inch。有关其他信息，请参阅reportlab用户指南的第9.3章！