`pygame`：在 Ubuntu 上，使用 `pygame.image.save` 保存 PNG 会导致 `pygame.error: SavePNG: could not create png write struct`答案

【问题标题】：`pygame`: on Ubuntu, using `pygame.image.save` to save PNG causes `pygame.error: SavePNG: could not create png write struct``pygame`：在 Ubuntu 上，使用 `pygame.image.save` 保存 PNG 会导致 `pygame.error: SavePNG: could not create png write struct`
【发布时间】：2016-03-03 08:43:34
【问题描述】：

错误：

  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

可能的提示 A：我现在在 Ubuntu 上。在 Windows 上运行相同的脚本时我没有遇到这个问题。

可能的提示 B： 第一次调用 pygame.image.save 时，libpng 会产生以下警告：

libpng 警告：使用 libpng-1.2.51 构建但使用 1.6.17 运行的应用程序

我应该怎么做才能解决这个问题？

我尝试过的一些事情：

1) 我可以加载 PNG 吗？ 可以

2) python -m pygame.tests的结果：

======================================================================
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)

这些测试的结果让我认为该问题不太可能是由于将我的代码从 Windows 移植到 Ubuntu 所特有的问题（例如，我已尝试尽可能修复路径名等，并且pygame 测试应该独立于平台，但仍然失败？）。

【问题讨论】：

标签： python ubuntu pygame libpng

【解决方案1】：

这个问题是因为I installed my Python stack using Anaconda引起的，然后是installed pygame using the build+install instructions for Ubuntu on pygame's documentation page。

这导致libpng 的库发生冲突，我想，在某个地方，不知何故。

无论如何，问题已通过以下方式解决：

1) 删除 pygame（因为我使用 pip 安装 pygame 的说明，pip uninstall pygame 成功了）

2) 安装pygameusing a build some kind soul had contributed to the conda repositories

然后，运行python -m pygame.tests 没有报告任何错误，除了：

======================================================================
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

就这个问题而言，我同意。

【讨论】：