Change isAvailable() to return false if numEnums=0; this is what other SDKs do

Author: MarkRivers

aravisApp/src/arvFeature.cpp

@@ -31,6 +31,17 @@ bool arvFeature::isImplemented() {
 }
 
 bool arvFeature::isAvailable() { 
+    // Other SDKs return isAvailable=false for enum features with no available enum values, and ADGenICam relies on this.
+    // Return false if numEnums is 0.
+    if (ARV_IS_GC_ENUMERATION(mNode)) {
+        guint numEnums;
+        ArvGcEnumeration *enumeration = (ARV_GC_ENUMERATION (mNode));
+        arv_gc_enumeration_dup_available_int_values(enumeration, &numEnums, NULL);
+        if (numEnums == 0) {
+            printf("arvFeature::isAvailable() returning false for %s because numEnums=0\n", mFeatureName.c_str());
+            return false;
+        }
+    }
     return arv_gc_feature_node_is_available(ARV_GC_FEATURE_NODE(mNode), NULL);
 }