Question

popplerqt5是python的pdf渲染库。

Annotation是此库中的抽象类。它具有许多子类，例如LinkAnnotation。如何从Annotation对象知道子类？

import popplerqt5 as poppler
import PyQt5
import PyQt5.QtXml

def main():

    file = 'file.pdf'

    doc = poppler.Poppler.Document.load(file)

    annotations     = doc.page(1).annotations()

    for annotation in annotations:
        print (annotation)
        # if isinstance(annotation, poppler.LinkAnnotation):
            # print ("Link")

if __name__ == "__main__":
    main()

这不起作用，未定义LinkAnnotation。我正在使用Python 3。

Answer 1

您必须使用poppler.Poppler.LinkAnnotation：

import popplerqt5 as poppler

def main():
    file = 'test.pdf'
    doc = poppler.Poppler.Document.load(file)
    annotations     = doc.page(2).annotations()
    for annotation in annotations:
        if isinstance(annotation, poppler.Poppler.LinkAnnotation):
            print ("Link")

if __name__ == "__main__":
    main()

如何在popplerqt5中测试注释的类型？

1 个答案: