Add debug logging for TWAIN calls

denisenkom · Mar 9, 2024 · 3dda4f1 · 3dda4f1
1 parent 2ef202a
commit 3dda4f1
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Showing 2 changed files with 3 additions and 1 deletion.
diff --git a/demo/simple_tk.py b/demo/simple_tk.py
@@ -91,5 +91,5 @@ def OnIdleTimer(self):
         self.after(250, self.OnIdleTimer)
 
 
-logging.basicConfig(level=logging.INFO)
+logging.basicConfig(level=logging.DEBUG)
 MainWindow(TITLE).mainloop()
diff --git a/src/twain/__init__.py b/src/twain/__init__.py
@@ -1307,7 +1307,9 @@ def _call(
         buf: typing.Any,
         expected_returns: tuple[int, ...] = (),
     ) -> int:
+        logger.debug("Calling TWAIN (%s,%d,%d,%d)", dest_id, dg, dat, msg)
         rv = self._entry(self._app_id, dest_id, dg, dat, msg, buf)
+        logger.debug("TWAIN returned: %d", rv)
         if rv == constants.TWRC_SUCCESS or rv in expected_returns:
             return rv
         if rv == constants.TWRC_FAILURE: