使用reportlab和django框架在一个pdf文件中生成多个qr代码

Question

使用reportlab,我如何生成一系列qr代码并将它们放在一个pdf中,然后在用户浏览器上打开它.这是我的尝试.提前致谢.对于下面的代码,没有任何反应.我原本希望提示保存pdf文件.

from reportlab.pdfgen import canvas
from django.http import HttpResponse
from reportlab.graphics.shapes import Drawing 
from reportlab.graphics.barcode.qr import QrCodeWidget 
from reportlab.graphics import renderPDF
# Create the HttpResponse object with the appropriate PDF headers.
response = HttpResponse(mimetype='application/pdf')
response['Content-Disposition'] = 'attachment; filename="somefilename.pdf"'

p = canvas.Canvas(response)

qrw = QrCodeWidget('Helo World!') 
b = qrw.getBounds()

w=b[2]-b[0] 
h=b[3]-b[1] 

d = Drawing(45,45,transform=[45./w,0,0,45./h,0,0]) 
d.add(qrw)

renderPDF.draw(d, p, 1, 1)

p.showPage()
p.save()
return response

Answer 1

你的代码对我有用,虽然我怀疑是因为你没有将它封装在一个视图中？

例如,myapp/views.py

from reportlab.pdfgen import canvas
from django.http import HttpResponse
from reportlab.graphics.shapes import Drawing 
from reportlab.graphics.barcode.qr import QrCodeWidget 
from reportlab.graphics import renderPDF


# Create your views here.
def test_qr(request):
    # Create the HttpResponse object with the appropriate PDF headers.
    response = HttpResponse(mimetype='application/pdf')
    response['Content-Disposition'] = 'attachment; filename="somefilename.pdf"'

    p = canvas.Canvas(response)

    qrw = QrCodeWidget('Helo World!') 
    b = qrw.getBounds()

    w=b[2]-b[0] 
    h=b[3]-b[1] 

    d = Drawing(45,45,transform=[45./w,0,0,45./h,0,0]) 
    d.add(qrw)

    renderPDF.draw(d, p, 1, 1)

    p.showPage()
    p.save()
    return response

MyProject的/ urls.py

from django.conf.urls.defaults import patterns, include, url

urlpatterns = patterns('',
    url(r'^$', 'myapp.views.test_qr'),
)

打开浏览器说,http:127.0.0.1:8000会提示我下载左下角带有QR码的pdf.如果您不确定如何使用Django,我建议您阅读Django Book Online