On Tue, Jun 23, 2009 at 12:06 PM, Stefan Seefeld <seef...@sympatico.ca>wrote:
> On 06/23/2009 02:45 PM, Jim Treadway wrote:
>
>> I'm having trouble getting a simple boost::python sample program to
>> work properly on Linux. It compiles and seems to link properly, but the
>> Python
>> interpreter is unable to call my C++ function. On Mac OS X the
>> program works as expected.
>>
>> Any help would be appreciated, hopefully I'm missing something obvious.
>>
>>
>
>
> Let's see:
>
> I expect the problem to be that the Python interpreter doesn't 'see' the
> 'Test' module. While normally this would just result in an import error,
> here it may just happen to find a different 'Test' module, which, as it
> doesn't match what you expect, raises an ArgumentError.
>
Renaming everything from test to "MyUniqueTest" produces the same effective
results.
-- BEGIN --
> #include<stdlib.h>
> #include<string>
> #include<boost/python.hpp>
>
> using namespace boost::python;
>
> /* g++ -I/usr/include/python2.5 -lpython2.5 -lboost_python -Wall -o
> test test.cpp */
>
> int test(int i)
> {
> fprintf(stderr, "%s:\n", __FUNCTION__);
> return i * 5;
> }
>
> BOOST_PYTHON_MODULE(Test)
> {
> using namespace boost::python;
> def("test", test);
> }
>
> int main(int argc, char *argv[])
> {
> Py_Initialize();
>
> try {
> initTest();
>
I'm actually not sure what the effect of calling 'initTest()' is.
> I believe you should call:
>
> PyImport_AppendInittab(const_cast<char*>("Test"), initTest);
My understanding is that PyImport_AppendInittab makes it so that a Python
"import" statement will call your initialization function so that you do not
have to call "initTest" (for example) from the C++ code.
Nevertheless, using PyImport_AppendInittab instead, in both the location you
recommend as well as before the call to Py_Initialize() produces no change
in the results.
PyRun_SimpleString("import Test");
> PyRun_SimpleString("print 'calling test function'");
> PyRun_SimpleString("print Test.test(5)");
> } catch (boost::python::error_already_set) {
> PyErr_Print();
> }
>
> Py_Finalize();
> return 0;
> }
> -- END --
I've also tried:
PyRun_SimpleString("import sys, dl");
PyRun_SimpleString("sys.setdlopenflags(dl.RTLD_NOW | dl.RTLD_GLOBAL);
before the "import Test" part, but that doesn't change the result either.
Jim
>
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