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