有没有人能够在python中使用poppler new_from_data? [英] Has anyone been able to use poppler new_from_data in python?

问题描述

使用Python3和Poppler，我可以毫无问题地使用new_from_file加载文件，但是new_from_data有问题.这里的代码显然是一个简单的测试，因为先读取文件然后再使用new_from_data没有意义，因为new_from_file可以正常工作，但是我无法在此处发布生成pdf文件的完整代码.

Using Python3, and Poppler, I can load files with new_from_file without problem, but new_from_data is problematic. Here is the code which is obviously a simple test, because it does not make sense to read from file and then use new_from_data, since new_from_file works perfectly, but I could not post here the full code generating the pdf file.

from gi.repository import Poppler, Gtk

def draw(widget, cr):
        # set background.
        cr.set_source_rgb(0.7, 0.6, 0.5)
        cr.paint()

        # set page background
        cr.set_source_rgb(1, 1, 1)
        cr.rectangle(0,0,800,400)

        cr.fill()
        page.render(cr)

filepath = "d:/Mes Documents/A5.pdf" 
f11 = open(filepath, "r", encoding = "cp850")
data1 = f11.read()
f11.close()

document = Poppler.Document.new_from_data(data1, len(data1),  None)
page = document.get_page(0)
print (document.get_n_pages())


window = Gtk.Window(title="Hello World")
window.connect("delete-event", Gtk.main_quit)
window.connect("draw", draw)
window.set_app_paintable(True)

window.show_all()
Gtk.main()

可能会发生四种不同的情况:

Four different situations may happen :

• 使用非常简单的pdf(Pdf参考13中的"Hello world"示例)，它可以工作.
• 对于普通文件，可能没有错误，但是get_n_pages返回0，而get_page(0)返回None
• 或者我可能会收到错误消息:GLib.Error:poppler-quark:PDF文档已损坏(4)
• 否则程序崩溃

我想知道问题是否出在编码参数上，但是我尝试了所有我认为没有结果的事情. 我尝试使用"rb"，然后使用:

I wonder if the problem may be with the encoding parameter, but I tried everything I thought of without result. I tried with "rb" and then converting bytes array to string with :

data1 = "".join(map(data1))

没有结果.

在Google上进行搜索从未返回有效的示例

Search on Google never returned a working example

推荐答案

我遇到了同样的问题，使用Gio.MemoryInputStream解决了该问题. 并不是很优雅，但是可以用...

I ran into the same problem, solved it using Gio.MemoryInputStream. Not really elegant but it works...

from gi.repository import Poppler, Gtk, Gio

def draw(widget, cr):
        # set background.
        cr.set_source_rgb(0.7, 0.6, 0.5)
        cr.paint()

        # set page background
        cr.set_source_rgb(1, 1, 1)
        cr.rectangle(0,0,800,400)

        cr.fill()
        page.render(cr)

filepath = "d:/Mes Documents/A5.pdf" 
with open(filepath, "rb") as f11:
    input_stream = Gio.MemoryInputStream.new_from_data(f11.read())
    # Take care that you need to call .close() on the Gio.MemoryInputStream once you're done with your pdf document.

document = Poppler.Document.new_from_stream(input_stream, -1, None, None)
page = document.get_page(0)
print (document.get_n_pages())


window = Gtk.Window(title="Hello World")
window.connect("delete-event", Gtk.main_quit)
window.connect("draw", draw)
window.set_app_paintable(True)

window.show_all()
Gtk.main()

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