解决方案是像任何普通的C ++类一样创建您的异常类
class MyCPPException : public std::exception {...}
诀窍是，所有boost :: python :: class_实例都拥有对对象类型的引用，可以通过它们的ptr（）函数对其进行访问。您可以通过boost :: python注册类来获得此代码，如下所示：
class_<MyCPPException> myCPPExceptionClass("MyCPPException"...);
PyObject *myCPPExceptionType=myCPPExceptionClass.ptr();
register_exception_translator<MyCPPException>(&translateFunc);
最后，当您将C ++异常转换为Python异常时，您需要执行以下操作：
void translate(MyCPPException const &e)
{
PyErr_SetObject(myCPPExceptionType, boost::python::object(e).ptr());
}
这是一个完整的工作示例：
#include <boost/python.hpp>
#include <assert.h>
#include <iostream>
class MyCPPException : public std::exception
{
private:
std::string message;
std::string exTradata;
public:
MyCPPException(std::string message, std::string exTradata)
{
this->message = message;
this->exTradata = exTradata;
}
const char *what() const throw()
{
return this->message.c_str();
}
~MyCPPException() throw()
{
}
std::string getMessage()
{
return this->message;
}
std::string getExTradata()
{
return this->exTradata;
}
};
void my_cpp_function(bool throwException)
{
std::cout << "Called a C++ function." << std::endl;
if (throwException)
{
throw MyCPPException("Throwing an exception as requested.",
"This is the extra data.");
}
}
PyObject *myCPPExceptionType = NULL;
void translateMyCPPException(MyCPPException const &e)
{
assert(myCPPExceptionType != NULL);
boost::python::object pythonExceptionInstance(e);
PyErr_SetObject(myCPPExceptionType, pythonExceptionInstance.ptr());
}
BOOST_PYTHON_MODULE(my_cpp_extension)
{
boost::python::class_<MyCPPException>
myCPPExceptionClass("MyCPPException",
boost::python::init<std::string, std::string>());
myCPPExceptionClass.add_property("message", &MyCPPException::getMessage)
.add_property("extra_data", &MyCPPException::getExTradata);
myCPPExceptionType = myCPPExceptionClass.ptr();
boost::python::register_exception_translator<MyCPPException>
(&translateMyCPPException);
boost::python::def("my_cpp_function", &my_cpp_function);
}
import my_cpp_extension
try:
my_cpp_extension.my_cpp_function(False)
print 'This line should be reached as no exception should be thrown.'
except my_cpp_extension.MyCPPException, e:
print 'Message:', e.message
print 'Extra data:',e.extra_data
try:
my_cpp_extension.my_cpp_function(True)
print ('This line should not be reached as an exception should have been' +
'thrown by Now.')
except my_cpp_extension.MyCPPException, e:
print 'Message:', e.message
print 'Extra data:',e.extra_data
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