// Borrowed reference to QtGui module
extern PyObject* moduleQtGui;

int SbkQApplication_Init(PyObject* self, PyObject* args, PyObject*)
{
    if (QApplication::instance()) {
        PyErr_SetString(PyExc_RuntimeError, "A QApplication instance already exists.");
        return -1;
    }

    int numArgs = PyTuple_GET_SIZE(args);
    if (numArgs != 1) {
        PyErr_BadArgument();
        return -1;
    }

    char** argv;
    int argc;
    if (!PySequence_to_argc_argv(PyTuple_GET_ITEM(args, 0), &argc, &argv)) {
        PyErr_BadArgument();
        return -1;
    }

    SbkBaseWrapper_setCptr(self, new QApplication(argc, argv));
    SbkBaseWrapper_setValidCppObject(self, 1);
    Shiboken::BindingManager::instance().registerWrapper(reinterpret_cast<SbkBaseWrapper*>(self));

    // Verify if qApp is in main module
    const char QAPP_MACRO[] = "qApp";
    PyObject* localsDict = PyEval_GetLocals();
    if (localsDict) {
        PyObject* qAppObj = PyDict_GetItemString(localsDict, QAPP_MACRO);
        if (qAppObj)
            PyDict_SetItemString(localsDict, QAPP_MACRO, self);
    }
    PyObject_SetAttrString(moduleQtGui, QAPP_MACRO, self);

    return 1;
}

// Borrowed reference to QtGui module
extern PyObject* moduleQtGui;

int SbkQApplication_Init(PyObject* self, PyObject* args, PyObject*)
{
    int numArgs = PyTuple_GET_SIZE(args);
    if (numArgs != 1) {
        PyErr_BadArgument();
        return -1;
    }

    char** argv;
    int argc;
    if (!PySequence_to_argc_argv(PyTuple_GET_ITEM(args, 0), &argc, &argv)) {
        PyErr_BadArgument();
        return -1;
    }

    SbkBaseWrapper_setCptr(self, new QApplication(argc, argv));
    SbkBaseWrapper_setValidCppObject(self, 1);
    Shiboken::BindingManager::instance().registerWrapper(reinterpret_cast<SbkBaseWrapper*>(self));

    // Verify if qApp is in main module
    const char QAPP_MACRO[] = "qApp";
    PyObject* localsDict = PyEval_GetLocals();
    if (localsDict) {
        PyObject* qAppObj = PyDict_GetItemString(localsDict, QAPP_MACRO);
        if (qAppObj)
            PyDict_SetItemString(localsDict, QAPP_MACRO, self);
    }
    PyObject_SetAttrString(moduleQtGui, QAPP_MACRO, self);

    return 1;
}

--- 
+++ 
@@ -3,6 +3,11 @@
 
 int SbkQApplication_Init(PyObject* self, PyObject* args, PyObject*)
 {
+    if (QApplication::instance()) {
+        PyErr_SetString(PyExc_RuntimeError, "A QApplication instance already exists.");
+        return -1;
+    }
+
     int numArgs = PyTuple_GET_SIZE(args);
     if (numArgs != 1) {
         PyErr_BadArgument();
Throw an exception when the user attempt to create more than one instance of QApplication.

Reviewed by Marcelo Lira <marcelo.lira@openbossa.org>
