On 10/01/2013 11:52 AM, Matt Newell wrote:
That sounds encouraging. But it lacks a little detail - like how does
one embed python (PyQt) into a C++ app. The sip I sort of understand
and it is doable. I only need a few C++ classes and that makes sense.
But I don't have a clue how or where to start on embeding PyQt. Does
someone have an example or a link explaining the details.
Johnf
The embedding is really not very involved. Here is a snippet of code from one
of my apps, with some irrelevant stuff removed. This both initializes python,
and loads CWD/plugins as a python module where you can load whatever you want
from the __init__.py, including submodules.
Matt
// Return the named attribute object from the named module.
// Returns a NEW reference(PyObject_GetAttrString)
PyObject * getModuleAttr(const char *module, const char *attr)
{
#if PY_VERSION_HEX >= 0x02050000
PyObject *mod = PyImport_ImportModule(module);
#else
PyObject *mod = PyImport_ImportModule(const_cast<char *>(module));
#endif
if (!mod)
{
PyErr_Print();
return 0;
}
#if PY_VERSION_HEX >= 0x02050000
PyObject *obj = PyObject_GetAttrString(mod, attr);
#else
PyObject *obj = PyObject_GetAttrString(mod, const_cast<char *>(attr));
#endif
Py_DECREF(mod);
if (!obj)
{
PyErr_Print();
return 0;
}
return obj;
}
void loadPythonPlugins()
{
Py_Initialize();
PyEval_InitThreads();
PyObject * sys_path = getModuleAttr("sys", "path");
if (!sys_path) {
LOG_1( "Python Initialization Failure: Failed to get sys.path"
);
return;
}
QString dir = QDir::currentPath();
// Convert the directory to a Python object with native separators.
#if QT_VERSION >= 0x040200
dir = QDir::toNativeSeparators(dir);
#else
dir = QDir::convertSeparators(dir);
#endif
#if PY_MAJOR_VERSION >= 3
// This is a copy of qpycore_PyObject_FromQString().
PyObject *dobj = PyUnicode_FromUnicode(0, dir.length());
if (!dobj)
{
PyErr_Print();
return;
}
Py_UNICODE *pyu = PyUnicode_AS_UNICODE(dobj);
for (int i = 0; i < dir.length(); ++i)
*pyu++ = dir.at(i).unicode();
#else
PyObject *dobj = PyString_FromString(dir.toAscii().constData());
if (!dobj)
{
PyErr_Print();
return;
}
#endif
// Add the directory to sys.path.
int rc = PyList_Append(sys_path, dobj);
Py_DECREF(dobj);
Py_DECREF(sys_path);
if (rc < 0)
{
PyErr_Print();
return;
}
PyObject *plug_mod = PyImport_ImportModule("plugins");
if (!plug_mod)
{
PyErr_Print();
return;
}
Py_DECREF(plug_mod);
PyEval_SaveThread();
}
Thanks I'll take a look later today.
Johnf
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