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EDIT :: _cffi_errors.h

#ifndef CFFI_MESSAGEBOX # ifdef _MSC_VER # define CFFI_MESSAGEBOX 1 # else # define CFFI_MESSAGEBOX 0 # endif #endif #if CFFI_MESSAGEBOX /* Windows only: logic to take the Python-CFFI embedding logic initialization errors and display them in a background thread with MessageBox. The idea is that if the whole program closes as a result of this problem, then likely it is already a console program and you can read the stderr output in the console too. If it is not a console program, then it will likely show its own dialog to complain, or generally not abruptly close, and for this case the background thread should stay alive. */ static void *volatile _cffi_bootstrap_text; static PyObject *_cffi_start_error_capture(void) { PyObject *result = NULL; PyObject *x, *m, *bi; if (InterlockedCompareExchangePointer(&_cffi_bootstrap_text, (void *)1, NULL) != NULL) return (PyObject *)1; m = PyImport_AddModule("_cffi_error_capture"); if (m == NULL) goto error; result = PyModule_GetDict(m); if (result == NULL) goto error; #if PY_MAJOR_VERSION >= 3 bi = PyImport_ImportModule("builtins"); #else bi = PyImport_ImportModule("__builtin__"); #endif if (bi == NULL) goto error; PyDict_SetItemString(result, "__builtins__", bi); Py_DECREF(bi); x = PyRun_String( "import sys\n" "class FileLike:\n" " def write(self, x):\n" " try:\n" " of.write(x)\n" " except: pass\n" " self.buf += x\n" " def flush(self):\n" " pass\n" "fl = FileLike()\n" "fl.buf = ''\n" "of = sys.stderr\n" "sys.stderr = fl\n" "def done():\n" " sys.stderr = of\n" " return fl.buf\n", /* make sure the returned value stays alive */ Py_file_input, result, result); Py_XDECREF(x); error: if (PyErr_Occurred()) { PyErr_WriteUnraisable(Py_None); PyErr_Clear(); } return result; } #pragma comment(lib, "user32.lib") static DWORD WINAPI _cffi_bootstrap_dialog(LPVOID ignored) { Sleep(666); /* may be interrupted if the whole process is closing */ #if PY_MAJOR_VERSION >= 3 MessageBoxW(NULL, (wchar_t *)_cffi_bootstrap_text, L"Python-CFFI error", MB_OK | MB_ICONERROR); #else MessageBoxA(NULL, (char *)_cffi_bootstrap_text, "Python-CFFI error", MB_OK | MB_ICONERROR); #endif _cffi_bootstrap_text = NULL; return 0; } static void _cffi_stop_error_capture(PyObject *ecap) { PyObject *s; void *text; if (ecap == (PyObject *)1) return; if (ecap == NULL) goto error; s = PyRun_String("done()", Py_eval_input, ecap, ecap); if (s == NULL) goto error; /* Show a dialog box, but in a background thread, and never show multiple dialog boxes at once. */ #if PY_MAJOR_VERSION >= 3 text = PyUnicode_AsWideCharString(s, NULL); #else text = PyString_AsString(s); #endif _cffi_bootstrap_text = text; if (text != NULL) { HANDLE h; h = CreateThread(NULL, 0, _cffi_bootstrap_dialog, NULL, 0, NULL); if (h != NULL) CloseHandle(h); } /* decref the string, but it should stay alive as 'fl.buf' in the small module above. It will really be freed only if we later get another similar error. So it's a leak of at most one copy of the small module. That's fine for this situation which is usually a "fatal error" anyway. */ Py_DECREF(s); PyErr_Clear(); return; error: _cffi_bootstrap_text = NULL; PyErr_Clear(); } #else static PyObject *_cffi_start_error_capture(void) { return NULL; } static void _cffi_stop_error_capture(PyObject *ecap) { } #endif

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