python 如何传递字典型变量（不定参数）给c++

<p>今天遇到一个难题，python要调用c++一个函数</p>
<p>c++函数是可变长的变量如add(int cmd,...)</p>
<p>然后再c++中使用va_list取得变长参数。</p>
<p>那么python 该如何调用该函数呢。弄了半天也没有发现boost.python如何支持该类型的参数。</p>
<p>后来一想，python dict不是就是可变长的参数吗，里边放什么都可以。</p>
<p>那么问题就转化问如何传递dict给c++。</p>
<p>贴源码如下：</p>
<p><strong>1.src.cpp</strong>
</p>
<p>#include &lt;iostream&gt;<br>
#include &lt;string&gt;<br>
#include&lt;stdarg.h&gt;<br>
#include &lt;Python.h&gt;<br>
using namespace std;<br><br>
/************************************************ simple method *************************************/<br>
void testA(PyObject *obj)<br>
{<br>
PyObject *ret = PyDict_GetItemString(obj, "b");<br>
int as = PyInt_AS_LONG(ret);<br>
printf( "**************************%d/n", as );<br>
}</p>
<p></p>
<p><strong>2.src4py.cpp</strong>
</p>
<p>#include &lt;boost/python.hpp&gt;<br>
#include &lt;boost/python/object_core.hpp&gt;<br>
#include "src.cpp"<br>
using namespace boost::python;<br>
BOOST_PYTHON_MODULE(test)<br>
{<br>
def("a", testA);<br>
}</p>
<p></p>
<p><strong>3.test.py</strong>
</p>
<p></p>
<p>import test<br>
a ={'b':2}<br>
test.a(a)</p>
<p><strong><br></strong>
</p>
<p><strong>4.makefile</strong>
</p>
<p><strong>all:test.so<br><br>
test.so:src.o src4py.o<br></strong>
g++ src4py.o -o test.so -shared -fPIC -I /usr/local/python/include/python2.5/ -I /usr/local/boost_143/include/ -L /usr/local/python/lib/python2.5/ -L<br>
/usr/local/boost_143/lib/ -lboost_python<br>
src.o:<br>
g++ -c src.cpp -o src.o -I /usr/local/python/include/python2.5/ <br>
src4py.o:src.o<br>
g++ -c src4py.cpp -o src4py.o -fPIC -I /usr/local/python/include/python2.5/ -I /usr/local/boost_143/include/ <br><br>
clean:<br>
rm -rf src.o src4py.o<br>
rm -rf test.so <strong><br></strong>
</p>
<p><strong><br></strong>
</p>
<p></p>
<p></p>