modules/python/test/test_persistence.py

   1 #!/usr/bin/env python
   2 """"Core serializaion tests."""
   3 import tempfile
   4 import os
   5 import cv2 as cv
   6 import numpy as np
   7 from tests_common import NewOpenCVTests
   8
   9
  10 class persistence_test(NewOpenCVTests):
  11     def test_yml_rw(self):
  12         fd, fname = tempfile.mkstemp(prefix="opencv_python_persistence_", suffix=".yml")
  13         os.close(fd)
  14
  15         # Writing ...
  16         expected = np.array([[[0, 1, 2, 3, 4]]])
  17         expected_str = ("Hello", "World", "!")
  18         fs = cv.FileStorage(fname, cv.FILE_STORAGE_WRITE)
  19         fs.write("test", expected)
  20         fs.write("strings", expected_str)
  21         fs.release()
  22
  23         # Reading ...
  24         fs = cv.FileStorage(fname, cv.FILE_STORAGE_READ)
  25         root = fs.getFirstTopLevelNode()
  26         self.assertEqual(root.name(), "test")
  27
  28         test = fs.getNode("test")
  29         self.assertEqual(test.empty(), False)
  30         self.assertEqual(test.name(), "test")
  31         self.assertEqual(test.type(), cv.FILE_NODE_MAP)
  32         self.assertEqual(test.isMap(), True)
  33         actual = test.mat()
  34         self.assertEqual(actual.shape, expected.shape)
  35         self.assertEqual(np.array_equal(expected, actual), True)
  36
  37         strings = fs.getNode("strings")
  38         self.assertEqual(strings.isSeq(), True)
  39         self.assertEqual(strings.size(), len(expected_str))
  40         self.assertEqual(all(strings.at(i).isString() for i in range(strings.size())), True)
  41         self.assertSequenceEqual([strings.at(i).string() for i in range(strings.size())], expected_str)
  42         fs.release()
  43
  44         os.remove(fname)