``pygame''：在Ubuntu上，使用``pygame.image.save''保存PNG会导致``pygame.error：SavePNG：无法创建png写结构''

Question

Error:

  File "/home/alien/cncell/core/animator.py", line 413, in create_animation_from_data
    pygame.image.save(screen, image_fp)
pygame.error: SavePNG: could not create png write struct

Possible hint A: I am now on Ubuntu. I did not have this issue when running the same script on Windows.

Possible hint B: When pygame.image.save is first called, libpng produces the following warning:

libpng warning: Application built with libpng-1.2.51 but running with 1.6.17

What should I do to fix this issue?

Some things I have tried:

1) can I load PNGs? yes

2) results of python -m pygame.tests :

======================================================================
FAIL: BaseModuleTest.test_get_error
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/home/brian/anaconda2/lib/python2.7/site-packages/pygame/tests/base_test.py", line 569, in test_get_error
    e)
AssertionError: Failed to access the SoundFont /usr/share/sounds/sf2/FluidR3_GM.sf2

======================================================================
FAIL: BaseModuleTest.test_set_error
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/home/brian/anaconda2/lib/python2.7/site-packages/pygame/tests/base_test.py", line 586, in test_set_error
    e)
AssertionError: Failed to access the SoundFont /usr/share/sounds/sf2/FluidR3_GM.sf2

======================================================================
ERROR: GL_ImageSave.test_image_save_works_with_opengl_surfaces
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/home/brian/anaconda2/lib/python2.7/site-packages/pygame/tests/image__save_gl_surface_test.py", line 37, in test_image_save_works_with_opengl_surfaces
    pygame.image.save(screen, tmp_file)
error: SavePNG: could not create png write struct

======================================================================
ERROR: ImageModuleTest.testSavePNG24
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/home/brian/anaconda2/lib/python2.7/site-packages/pygame/tests/image_test.py", line 215, in testSavePNG24
    pygame.image.save(surf, f_path)
error: SavePNG: could not create png write struct

======================================================================
ERROR: ImageModuleTest.testSavePNG32
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/home/brian/anaconda2/lib/python2.7/site-packages/pygame/tests/image_test.py", line 184, in testSavePNG32
    pygame.image.save(surf, f_path)
error: SavePNG: could not create png write struct

======================================================================
ERROR: ImageModuleTest.test_save
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/home/brian/anaconda2/lib/python2.7/site-packages/pygame/tests/image_test.py", line 248, in test_save
    pygame.image.save(s, temp_filename)
error: SavePNG: could not create png write struct

======================================================================
ERROR: ImageModuleTest.test_save_colorkey
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/home/brian/anaconda2/lib/python2.7/site-packages/pygame/tests/image_test.py", line 275, in test_save_colorkey
    pygame.image.save(s, temp_filename)
error: SavePNG: could not create png write struct

======================================================================
ERROR: ImageextModuleTest.test_save_unicode_path
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/home/brian/anaconda2/lib/python2.7/site-packages/pygame/tests/imageext_test.py", line 65, in test_save_unicode_path
    imageext.save_extended(im, temp_file)
error: SavePNG: could not create png write struct

----------------------------------------------------------------------
Ran 708 tests in 28.894s

FAILED (failures=2, errors=6)

The results of these tests makes me think that the issue is unlikely to be due to issues specific to the porting of my code from Windows to Ubuntu (so for instance, I have tried to fix pathnames, etc. wherever possible, and the pygame tests should be platform independent, but still fail?).

Answer 1

This problem was caused because I installed my Python stack using Anaconda , but then installed pygame using the build+install instructions for Ubuntu on pygame 's documentation page .

This caused there to be conflicting libraries of libpng , I think, somewhere, somehow.

Anyway, the issue was fixed by:

1) removing pygame (since the instructions I used pip to install pygame, pip uninstall pygame did the trick)

2) installing pygame using a build some kind soul had contributed to the conda repositories

Then, running python -m pygame.tests reported no errors except for:

======================================================================
FAIL: BaseModuleTest.test_get_error
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/home/brian/anaconda2/lib/python2.7/site-packages/pygame/tests/base_test.py", line 569, in test_get_error
    e)
AssertionError: Failed to access the SoundFont /usr/share/sounds/sf2/FluidR3_GM.sf2

======================================================================
FAIL: BaseModuleTest.test_set_error
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/home/brian/anaconda2/lib/python2.7/site-packages/pygame/tests/base_test.py", line 586, in test_set_error
    e)
AssertionError: Failed to access the SoundFont /usr/share/sounds/sf2/FluidR3_GM.sf2

Which I am okay with, for the purposes of this question.