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<doc-anchor-target id="write-c-bindings" class="break-words">
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<h1>
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<doc-anchor-trigger class="header-anchor-trigger" to="#write-c-bindings">#</doc-anchor-trigger>
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<span>Write C Bindings</span>
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</h1>
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</doc-anchor-target>
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<p>In order to use a C/C++ library in python, you need to write bindings for it.</p>
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<p>pkpy uses an universal signature to wrap a C function pointer as a python function or method, i.e <code v-pre>py_CFunction</code>.</p>
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<div class="codeblock-wrapper"><doc-codeblock>
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<pre translate="no" class="language-c"><code v-pre class="language-c">typedef bool (*py_CFunction)(int argc, py_Ref argv);</code></pre>
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</doc-codeblock></div>
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<ul>
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<li><code v-pre>argc</code> is the number of arguments passed to the function.</li>
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<li><code v-pre>argv</code> is the pointer to the first argument.</li>
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</ul>
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<p>If successful, the function should return <code v-pre>true</code> and set the return value in <code v-pre>py_retval()</code>. In case there is no return value, you should use <code v-pre>py_newnone(py_retval())</code>.
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If an error occurs, the function should raise an exception and return <code v-pre>false</code>.</p>
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<h2>
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<doc-anchor-trigger class="header-anchor-trigger" to="#steps">#</doc-anchor-trigger>
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<span>Steps</span>
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</h2>
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</doc-anchor-target>
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<p>Say you have a function <code v-pre>add</code> that takes two integers and returns their sum.</p>
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<div class="codeblock-wrapper"><doc-codeblock>
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<pre translate="no" class="language-c"><code v-pre class="language-c">int add(int a, int b) {
|
|
return a + b;
|
|
}</code></pre>
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</doc-codeblock></div>
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<p>Here is how you can write the binding for it:</p>
|
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<div class="codeblock-wrapper"><doc-codeblock>
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<pre translate="no" class="language-c"><code v-pre class="language-c">// 1. Define a wrapper function with the signature `py_CFunction`.
|
|
bool py_add(int argc, py_Ref argv) {
|
|
// 2. Check the number of arguments.
|
|
PY_CHECK_ARGC(2);
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|
// 3. Check the type of arguments.
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|
PY_CHECK_ARG_TYPE(0, tp_int);
|
|
PY_CHECK_ARG_TYPE(1, tp_int);
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// 4. Convert the arguments into C types.
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|
int _0 = py_toint(py_arg(0));
|
|
int _1 = py_toint(py_arg(1));
|
|
// 5. Call the original function.
|
|
int res = add(_0, _1);
|
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// 6. Set the return value.
|
|
py_newint(py_retval(), res);
|
|
// 7. Return `true`.
|
|
return true;
|
|
}</code></pre>
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</doc-codeblock></div>
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<p>Once you have the wrapper function, you can bind it to a python module via <code v-pre>py_bindfunc</code>.</p>
|
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<div class="codeblock-wrapper"><doc-codeblock>
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<pre translate="no" class="language-c"><code v-pre class="language-c">py_GlobalRef mod = py_getmodule("__main__");
|
|
py_bindfunc(mod, "add", py_add);</code></pre>
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</doc-codeblock></div>
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<p>Alternatively, you can use <code v-pre>py_bind</code> with a signature, which allows you to specify some default values.</p>
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<div class="codeblock-wrapper"><doc-codeblock>
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<pre translate="no" class="language-c"><code v-pre class="language-c">py_GlobalRef mod = py_getmodule("__main__");
|
|
py_bind(mod, "add(a, b=1)", py_add);</code></pre>
|
|
</doc-codeblock></div>
|
|
<p>See also:</p>
|
|
<ul>
|
|
<li><a href="../c-api/functions/#py_bind"><code v-pre>py_bind</code></a></li>
|
|
<li><a href="../c-api/functions/#py_bindmethod"><code v-pre>py_bindmethod</code></a></li>
|
|
<li><a href="../c-api/functions/#py_bindfunc"><code v-pre>py_bindfunc</code></a></li>
|
|
<li><a href="../c-api/functions/#py_bindproperty"><code v-pre>py_bindproperty</code></a></li>
|
|
<li><a href="../c-api/functions/#py_newmodule"><code v-pre>py_newmodule</code></a></li>
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<li><a href="../c-api/functions/#py_newtype"><code v-pre>py_newtype</code></a></li>
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