Question

为了从数据库打印字符串，我所知道的是生成一个pdf，然后在按钮点击时渲染它。我想通过单击按钮来实现所有这些（生成pdf和渲染）。是否有更快的＆amp;有效的方法来实现这一目标？

Answer 1

我认为你必须在同一个视图中生成和渲染pdf。我有一个宠物项目，我生成pdf票http://ticket4event.herokuapp.com/en/

View，负责生成和返回pdf票证：

def ticket(request, pk):
    """
    Show example of the ticket
    :param request:
    :return: response
    """

    t = get_object_or_404(Ticket, pk=pk)
    pdf_ticket = ticket_to_pdf(t.visitor, t.event)
    response = HttpResponse(pdf_ticket['content'], content_type=pdf_ticket['mimetype'])
    response['Content-Disposition'] = ('inline; filename=' + pdf_ticket['filename'])

    return response

用于渲染pdf的辅助函数：

def ticket_to_pdf(visitor, event):
    """
    Render ticket to pdf 
    :param visitor:
    :param event:
    :return: dict with pdf and meta info
    """

    filename = 'ticket.pdf'
    current_site = Site.objects.get_current().domain
    site = '{scheme}://{host}'.format(scheme=config.SCHEME, host=current_site)
    url = pyqrcode.create(current_site + visitor.get_absolute_url())
    qr_code = url.png_as_base64_str(scale=5)
    ticket = render_to_string('pdf/ticket.html', {'visitor': visitor,
                                              'qr_code': qr_code,
                                              'event': event,
                                              'config': config})

    html = HTML(string=ticket, base_url=site)
    pdf = html.write_pdf()

    return {
        'filename': filename,
        'content': pdf,
        'mimetype': 'application/pdf',
    }

如何使用单击按钮在django中打印（到打印机）字符串？

1 个答案: