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<title>Ghostscript language bindings</title>
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<!-- note: don't tab indent <article> as it has <pre> code which will have its layout adversly affected -->
<article class="markdown-body entry-content"><h1 id="python-overview">Python overview</h1>
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<div class="python-text"></div>
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<h2 id="about">About</h2>
<p>The <code>Python</code> API is provided by the file <a href="python-gsapi">gsapi.py</a> - this is the binding to the Ghostscript <code>C</code> library.</p>
<p>In the <a href="https://github.com/ArtifexSoftware/ghostpdl">GhostPDL repository</a> sample <code>Python</code> examples can be found in <code>/demos/python/examples.py</code>.</p>
<h2 id="platform-setup">Platform & setup</h2>
<h3 id="building-ghostscript">Building Ghostscript</h3>
<p>Ghostscript should be built as a shared library for your platform.</p>
<p>See <a href="index.html#building-ghostscript">Building Ghostscript</a>.</p>
<h2 id="specifying-the-ghostscript-shared-library">Specifying the Ghostscript shared library</h2>
<p>Two environmental variables can be used to specify where to find the Ghostscript shared library.</p>
<p><code>GSAPI_LIB</code> sets the exact path of the Ghostscript shared library, otherwise, <code>GSAPI_LIBDIR</code> sets the directory containing the Ghostscript shared library.</p>
<p>If neither is defined we will use the OS's default location(s) for shared libraries.</p>
<p>If <code>GSAPI_LIB</code> is not defined, the leafname of the shared library is inferred
from the OS type - <code>libgs.so</code> on Unix, <code>libgs.dylib</code> on MacOS, <code>gsdll64.dll</code> on Windows 64.</p>
<h2 id="api-test">API test</h2>
<p>The <code>gsapi.py</code> file that provides the <code>Python</code> bindings can also be used to test the bindings, by running it directly.</p>
<p>Assuming that your Ghostscript library has successfully been created, then from the root of your <code>ghostpdl</code> checkout run:</p>
<h4 id="windows">Windows</h4>
<div class="tag shellCommand"> from ghostpdl</div>
<pre><code>// Run gsapi.py as a test script in a cmd.exe window:
set GSAPI_LIBDIR=debugbin&& python ./demos/python/gsapi.py
// Run gsapi.py as a test script in a PowerShell window:
cmd /C "set GSAPI_LIBDIR=debugbin&& python ./demos/python/gsapi.py"</code></pre><h4 id="linux-openbsd-macos">Linux/OpenBSD/MacOS</h4>
<div class="tag shellCommand"> from ghostpdl</div>
<pre><code>// Run gsapi.py as a test script:
GSAPI_LIBDIR=sodebugbin ./demos/python/gsapi.py</code></pre><p>If there are no errors then this will have validated that the Ghostscript library is present & operational.</p>
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<div class="link"><a href="#specifying-the-ghostscript-shared-library">Specifying the Ghostscript shared library</a></div>
<div class="link"><a href="#api-test">API test</a></div>
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