[29] | 1 | // Copyright Stefan Seefeld 2005. |
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| 2 | // Distributed under the Boost Software License, Version 1.0. (See |
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| 3 | // accompanying file LICENSE_1_0.txt or copy at |
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| 4 | // http://www.boost.org/LICENSE_1_0.txt) |
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| 5 | |
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| 6 | #include <boost/python.hpp> |
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| 7 | |
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| 8 | #include <boost/detail/lightweight_test.hpp> |
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| 9 | #include <iostream> |
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| 10 | |
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| 11 | |
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| 12 | namespace python = boost::python; |
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| 13 | |
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| 14 | // An abstract base class |
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| 15 | class Base : public boost::noncopyable |
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| 16 | { |
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| 17 | public: |
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| 18 | virtual ~Base() {}; |
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| 19 | virtual std::string hello() = 0; |
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| 20 | }; |
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| 21 | |
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| 22 | // C++ derived class |
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| 23 | class CppDerived : public Base |
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| 24 | { |
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| 25 | public: |
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| 26 | virtual ~CppDerived() {} |
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| 27 | virtual std::string hello() { return "Hello from C++!";} |
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| 28 | }; |
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| 29 | |
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| 30 | // Familiar Boost.Python wrapper class for Base |
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| 31 | struct BaseWrap : Base, python::wrapper<Base> |
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| 32 | { |
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| 33 | virtual std::string hello() |
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| 34 | { |
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| 35 | #if BOOST_WORKAROUND(BOOST_MSVC, <= 1300) |
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| 36 | // workaround for VC++ 6.x or 7.0, see |
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| 37 | // http://boost.org/libs/python/doc/tutorial/doc/html/python/exposing.html#python.class_virtual_functions |
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| 38 | return python::call<std::string>(this->get_override("hello").ptr()); |
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| 39 | #else |
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| 40 | return this->get_override("hello")(); |
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| 41 | #endif |
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| 42 | } |
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| 43 | }; |
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| 44 | |
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| 45 | // Pack the Base class wrapper into a module |
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| 46 | BOOST_PYTHON_MODULE(embedded_hello) |
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| 47 | { |
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| 48 | python::class_<BaseWrap, boost::noncopyable> base("Base"); |
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| 49 | } |
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| 50 | |
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| 51 | |
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| 52 | void eval_test() |
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| 53 | { |
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| 54 | python::object result = python::eval("'abcdefg'.upper()"); |
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| 55 | std::string value = python::extract<std::string>(result) BOOST_EXTRACT_WORKAROUND; |
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| 56 | BOOST_TEST(value == "ABCDEFG"); |
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| 57 | } |
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| 58 | |
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| 59 | void exec_test() |
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| 60 | { |
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| 61 | // Register the module with the interpreter |
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| 62 | if (PyImport_AppendInittab("embedded_hello", initembedded_hello) == -1) |
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| 63 | throw std::runtime_error("Failed to add embedded_hello to the interpreter's " |
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| 64 | "builtin modules"); |
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| 65 | // Retrieve the main module |
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| 66 | python::object main = python::import("__main__"); |
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| 67 | |
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| 68 | // Retrieve the main module's namespace |
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| 69 | python::object global(main.attr("__dict__")); |
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| 70 | |
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| 71 | // Define the derived class in Python. |
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| 72 | python::object result = python::exec( |
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| 73 | "from embedded_hello import * \n" |
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| 74 | "class PythonDerived(Base): \n" |
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| 75 | " def hello(self): \n" |
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| 76 | " return 'Hello from Python!' \n", |
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| 77 | global, global); |
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| 78 | |
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| 79 | python::object PythonDerived = global["PythonDerived"]; |
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| 80 | |
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| 81 | // Creating and using instances of the C++ class is as easy as always. |
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| 82 | CppDerived cpp; |
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| 83 | BOOST_TEST(cpp.hello() == "Hello from C++!"); |
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| 84 | |
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| 85 | // But now creating and using instances of the Python class is almost |
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| 86 | // as easy! |
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| 87 | python::object py_base = PythonDerived(); |
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| 88 | Base& py = python::extract<Base&>(py_base) BOOST_EXTRACT_WORKAROUND; |
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| 89 | |
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| 90 | // Make sure the right 'hello' method is called. |
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| 91 | BOOST_TEST(py.hello() == "Hello from Python!"); |
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| 92 | } |
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| 93 | |
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| 94 | void exec_file_test(std::string const &script) |
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| 95 | { |
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| 96 | // Run a python script in an empty environment. |
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| 97 | python::dict global; |
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| 98 | python::object result = python::exec_file(script.c_str(), global, global); |
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| 99 | |
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| 100 | // Extract an object the script stored in the global dictionary. |
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| 101 | BOOST_TEST(python::extract<int>(global["number"]) == 42); |
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| 102 | } |
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| 103 | |
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| 104 | void exec_test_error() |
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| 105 | { |
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| 106 | // Execute a statement that raises a python exception. |
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| 107 | python::dict global; |
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| 108 | python::object result = python::exec("print unknown \n", global, global); |
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| 109 | } |
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| 110 | |
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| 111 | int main(int argc, char **argv) |
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| 112 | { |
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| 113 | BOOST_TEST(argc == 2); |
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| 114 | std::string script = argv[1]; |
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| 115 | // Initialize the interpreter |
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| 116 | Py_Initialize(); |
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| 117 | |
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| 118 | if (python::handle_exception(eval_test) || |
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| 119 | python::handle_exception(exec_test) || |
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| 120 | python::handle_exception(boost::bind(exec_file_test, script))) |
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| 121 | { |
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| 122 | if (PyErr_Occurred()) |
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| 123 | { |
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| 124 | BOOST_ERROR("Python Error detected"); |
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| 125 | PyErr_Print(); |
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| 126 | } |
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| 127 | else |
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| 128 | { |
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| 129 | BOOST_ERROR("A C++ exception was thrown for which " |
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| 130 | "there was no exception handler registered."); |
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| 131 | } |
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| 132 | } |
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| 133 | |
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| 134 | if (python::handle_exception(exec_test_error)) |
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| 135 | { |
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| 136 | if (PyErr_Occurred()) |
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| 137 | { |
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| 138 | PyErr_Print(); |
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| 139 | } |
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| 140 | else |
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| 141 | { |
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| 142 | BOOST_ERROR("A C++ exception was thrown for which " |
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| 143 | "there was no exception handler registered."); |
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| 144 | } |
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| 145 | } |
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| 146 | else |
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| 147 | { |
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| 148 | BOOST_ERROR("Python exception expected, but not seen."); |
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| 149 | } |
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| 150 | |
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| 151 | // Boost.Python doesn't support Py_Finalize yet. |
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| 152 | // Py_Finalize(); |
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| 153 | return boost::report_errors(); |
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| 154 | } |
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| 155 | |
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| 156 | // Including this file makes sure |
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| 157 | // that on Windows, any crashes (e.g. null pointer dereferences) invoke |
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| 158 | // the debugger immediately, rather than being translated into structured |
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| 159 | // exceptions that can interfere with debugging. |
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| 160 | #include "module_tail.cpp" |
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