无法使用 html2pdf 将图像转换为 pdf（文件返回错误的 URL）

Question

这是我找到的假设解决方案。 https://stackoverflow.com/a/2180417

我正在尝试实现它，但我无法做到。

这是我当前的代码：

utils.py

from io import BytesIO
from django.http import HttpResponse
from django.template.loader import get_template

from xhtml2pdf import pisa

def render_to_pdf(template_src, context_dict={}):
     template = get_template(template_src)
     html  = template.render(context_dict)
     result = BytesIO()
     pdf = pisa.pisaDocument(BytesIO(html.encode("ISO-8859-1")), result, link_callback=fetch_resources)
     if not pdf.err:
          return HttpResponse(result.getvalue(), content_type='application/pdf')
     return None

def fetch_resources(uri, rel):
    path = os.path.join(settings.MEDIA_ROOT, uri.replace(settings.MEDIA_URL, ""))

    return path

views.py

 from django.http import HttpResponse
 from django.views.generic import View

 from yourproject.utils import render_to_pdf #created in step 4

 class GeneratePdf(View):
     def get(self, request, *args, **kwargs):
         data = {
              'today': datetime.date.today(), 
              'amount': 39.99,
             'customer_name': 'Cooper Mann',
             'order_id': 1233434,
         }
         pdf = render_to_pdf('pdf/invoice.html', data)
         return HttpResponse(pdf, content_type='application/pdf')

如果我只是渲染一个普通的模板，一切都会正确加载，所以我知道问题出在这部分过程中。 invoice.html 模板包含一个 URL，例如 /home/images/products/1231

<img src='{{ photo.url }}'>

Answer 1

要在 pdf 中渲染图像，您需要使用以下函数进行图像回调：

def link_callback(uri, rel):
    """
    Convert HTML URIs to absolute system paths so xhtml2pdf can access those
    resources
    """
    # use short variable names
    sUrl = settings.STATIC_URL      # Typically /static/
    sRoot = settings.STATIC_ROOT    # Typically /home/userX/project_static/
    mUrl = settings.MEDIA_URL       # Typically /static/media/
    mRoot = settings.MEDIA_ROOT     # Typically /home/userX/project_static/media/

    # convert URIs to absolute system paths
    if uri.startswith(mUrl):
        path = os.path.join(mRoot, uri.replace(mUrl, ""))
    elif uri.startswith(sUrl):
        path = os.path.join(sRoot, uri.replace(sUrl, ""))
    else:
        return uri  # handle absolute uri (ie: http://some.tld/foo.png)

    # make sure that file exists
    if not os.path.isfile(path):
            raise Exception(
                'media URI must start with %s or %s' % (sUrl, mUrl)
            )
    return path

接下来添加渲染函数。

链接：Biblioteca xhtml2pdf

如果此答案对您有所帮助，请将其标记为答案。

Answer 2

无需设置获取资源。它对我有用

def render_to_pdf(template_src, context_dict={}):
    template = get_template(template_src)
    html = template.render(context_dict)
    result = BytesIO()
    pdf = pisa.pisaDocument(BytesIO(html.encode("ISO-8859-1")), result)
    if not pdf.err:
     return HttpResponse(result.getvalue(), content_type='application/pdf')
    return None

也可以试试这个链接html-template-to-pdf-in-django