From f51a95ce3498eff91427d31faeb58901bcfed566 Mon Sep 17 00:00:00 2001
From: Nico Stuurman <nico.stuurman@ucsf.edu>
Date: Fri, 22 Nov 2024 09:50:18 -0800
Subject: [PATCH] openCV: Now backward compatible with oprevious config files.

---
 DeviceAdapters/OpenCVgrabber/OpenCVgrabber.cpp | 7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)

diff --git a/DeviceAdapters/OpenCVgrabber/OpenCVgrabber.cpp b/DeviceAdapters/OpenCVgrabber/OpenCVgrabber.cpp
index 4751bd195..4d8f581a3 100644
--- a/DeviceAdapters/OpenCVgrabber/OpenCVgrabber.cpp
+++ b/DeviceAdapters/OpenCVgrabber/OpenCVgrabber.cpp
@@ -177,9 +177,8 @@ COpenCVgrabber::COpenCVgrabber() :
          AddAllowedValue(cIDName, devices.at(i).deviceName.c_str());
       }
    }
-   else {
-      AddAllowedValue(cIDName, "Undefined");
-   }
+   // when no devices are found and for backward compatibility, allow the Undefined value
+   AddAllowedValue(cIDName, "Undefined");
 #else
    String cIDNameReally = "Camera Number";
    CPropertyAction* pAct = new CPropertyAction(this, &COpenCVgrabber::OnCameraID);
@@ -1097,8 +1096,8 @@ int COpenCVgrabber::OnCameraID(MM::PropertyBase* pProp, MM::ActionType eAct)
             return DEVICE_OK;
          }
       }
+      pProp->Set("Undefined");
    }
-   return DEVICE_NOT_CONNECTED;
 #else
    if (eAct == MM::AfterSet)
    {