django：服务动态（reportlab）PNG模板

Question

我已经花了一天的时间在这个问题上没有成功，所以帮助，将不胜感激。

我使用ReportLab的，并成功地用它呈现给浏览器生成图形这个tutorial：

 d = MyBarChartDrawing() 

     #extract the request params of interest. 
     #I suggest having a default for everything. 
     if 'height' in request: 
      d.height = int(request['height']) 
     if 'width' in request: 
      d.width = int(request['width']) 

     if 'numbers' in request: 
      strNumbers = request['numbers'] 
      numbers = map(int, strNumbers.split(','))  
      d.chart.data = [numbers] #bar charts take a list-of-lists for data 

     if 'title' in request: 
      d.title.text = request['title'] 


     #get a GIF (or PNG, JPG, or whatever) 
     binaryStuff = d.asString('png') 

     return HttpResponse(binaryStuff, 'image/png') 

我的问题是，虽然我想在模板中渲染PNG文件，像这样（不工作）：

return render(request, "subscription/monitorSizes.html", {'form':form,'message':'','graph':binaryStuff}) 

我一直在黑客这个问题多年。这无疑是一个新手问题！为了保存我的理智，请欣赏这方面的建议。非常感谢:)

编辑：我发现另一个stackoverflow Q在同一个问题上，但它并没有真正解决。

Answer 1

在views.py

def show_image(request): 
    d = MyBarChartDrawing() 
    #extract the request params of interest. 
    #I suggest having a default for everything. 
    if 'height' in request: 
     d.height = int(request['height']) 
    if 'width' in request: 
     d.width = int(request['width']) 

    if 'numbers' in request: 
     strNumbers = request['numbers'] 
     numbers = map(int, strNumbers.split(','))  
     d.chart.data = [numbers] #bar charts take a list-of-lists for data 

    if 'title' in request: 
     d.title.text = request['title'] 


    #get a GIF (or PNG, JPG, or whatever) 
    binaryStuff = d.asString('png') 

    return HttpResponse(binaryStuff, 'image/png') 

def somepage(request): 
    return render(request, "subscription/monitorSizes.html", {'form':form,'message':'','graph':reverse('show_image')}) 

在urls.py

... 
url(r'^show_image/$', 'your_view.show_image', name='show_image'), 
url(r'^somepage/$', 'your_view.somepage', name='somepage'), 
... 

在认购/ monitorSizes.html

... 
{% if graph != '' %} <img src="{{ graph }}" alt="some_text"> {% endif %} 
...