Add is_connected() method to python_binding example

CHANGELOG.md

@@ -4,6 +4,7 @@ All notable changes to the Softcam library will be documented in this file.
 
 ### [Unreleased]
 - Added `scIsConnected()` method to API to make application connection waiting more flexible by @jekyll2014. (thanks!) [#51](https://github.com/tshino/softcam/pull/51)
+- Added corresponding `is_connected()` method to the python_binding example.
 - Updated solution file version from Visual Studio 2019 to Visual Studio 2022. [#45](https://github.com/tshino/softcam/pull/45)
 - Added `pushd`/`popd` to example installer BAT files to work correctly even if launched from another directory. [#48](https://github.com/tshino/softcam/pull/48)
 

examples/python_binding/python_binding.cpp

@@ -79,6 +79,16 @@ class Camera
         return scWaitForConnection(m_camera, timeout);
     }
 
+    bool IsConnected()
+    {
+        if (!m_camera)
+        {
+            throw std::runtime_error("the camera instance has been deleted");
+        }
+
+        return scIsConnected(m_camera);
+    }
+
  private:
     scCamera    m_camera{};
     int         m_width = 0;
@@ -110,5 +120,9 @@ PYBIND11_MODULE(softcam, m) {
             &Camera::WaitForConnection,
             py::arg("timeout") = 0.0f
         )
+        .def(
+            "is_connected",
+            &Camera::IsConnected
+        )
     ;
 }

examples/python_binding/tests/test_softcam.py

@@ -116,3 +116,17 @@ def test_wait_for_connection_use_after_free():
     with pytest.raises(RuntimeError) as e:
         assert cam.wait_for_connection()
     assert e.value.args == ('the camera instance has been deleted',)
+
+
+def test_is_connected():
+    cam = softcam.camera(320, 240, 60)
+    assert cam.is_connected() == False
+    cam = None
+
+
+def test_is_connected_use_after_free():
+    cam = softcam.camera(320, 240, 60)
+    cam.delete()
+    with pytest.raises(RuntimeError) as e:
+        assert cam.is_connected()
+    assert e.value.args == ('the camera instance has been deleted',)