155 lines
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HTML
155 lines
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<title>Slots and c_api - Making functions and data available from other modules — pygame v2.5.2 documentation</title>
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<section id="slots-and-c-api-making-functions-and-data-available-from-other-modules">
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<p>One example is pg_RGBAFromObj where the implementation is defined in base.c, and also exported in base.c (and _pygame.h).</p>
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<p>base.c has this exposing the pg_RGBAFromObj function to the <cite>c_api</cite> structure:</p>
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<blockquote>
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<div><p>c_api[12] = pg_RGBAFromObj;</p>
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</div></blockquote>
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<p>Then in src_c/include/_pygame.h there is an</p>
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<blockquote>
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<div><p>#define pg_RGBAFromObj.</p>
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</div></blockquote>
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<p>Also in _pygame.h, it needs to define the number of slots the base module uses. This is PYGAMEAPI_BASE_NUMSLOTS. So if you were adding another function, you need to increment this PYGAMEAPI_BASE_NUMSLOTS number.</p>
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<p>Then to use the pg_RGBAFromObj in other files,</p>
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<ol class="arabic">
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<li><p>include the "pygame.h" file,</p></li>
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<li><p>they have to make sure base is imported with:</p>
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<blockquote>
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<div><p>import_pygame_base();</p>
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</div></blockquote>
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</li>
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</ol>
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<p>Examples that use pg_RGBAFromObj are: _freetype.c, color.c, gfxdraw.c, and surface.c.</p>
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</section>
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<br /><br />
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<a href="https://github.com/pygame/pygame/edit/main/docs/reST/c_api\slots.rst" rel="nofollow">Edit on GitHub</a>
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