From 0bc7a462d9ec8afe13aeebaaea93860a88bda86a Mon Sep 17 00:00:00 2001
From: PTA00 <59364024+PTA00@users.noreply.github.com>
Date: Wed, 9 Mar 2022 13:53:45 +0800
Subject: [PATCH] [tested]Fixed open file dialog cancel error. (#856)

* Fix

Error "IndexError: list index out of range"  occurs when there is no "predefined_classes.txt".

* Fix an error when default label is null.

Error "IndexError: list index out of range"  occurs when there is no "/data/predefined_classes.txt".

* Update README.rst

ADD: Package as a separate exe file method.

* Fixed an error after opening a file to cancel

The cause of the error:
QFileDialog.getOpenFileName(...) second parameter required cannot be empty.
---
 labelImg.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/labelImg.py b/labelImg.py
index 053cde0c..a19f3372 100755
--- a/labelImg.py
+++ b/labelImg.py
@@ -1391,7 +1391,7 @@ class MainWindow(QMainWindow, WindowMixin):
         path = os.path.dirname(ustr(self.file_path)) if self.file_path else '.'
         formats = ['*.%s' % fmt.data().decode("ascii").lower() for fmt in QImageReader.supportedImageFormats()]
         filters = "Image & Label files (%s)" % ' '.join(formats + ['*%s' % LabelFile.suffix])
-        filename = QFileDialog.getOpenFileName(self, '%s - Choose Image or Label file' % __appname__, path, filters)
+        filename,_ = QFileDialog.getOpenFileName(self, '%s - Choose Image or Label file' % __appname__, path, filters)
         if filename:
             if isinstance(filename, (tuple, list)):
                 filename = filename[0]