Binding: check for lib using providesSymbol instead of except. (GH-252)

Author: greenrobot-team

objectbox/lib/src/native/bindings/bindings.dart

@@ -19,12 +19,17 @@ ObjectBoxC? _tryObjectBoxLibProcess() {
   // [DynamicLibrary.process()] is not supported on windows, see its docs.
   if (Platform.isWindows) return null;
 
-  ObjectBoxC? obxc;
   try {
-    _lib = DynamicLibrary.process();
-    obxc = ObjectBoxC(_lib!);
-    _isSupportedVersion(obxc); // may throw in case symbols are not found
-    return obxc;
+    final lib = DynamicLibrary.process();
+    // Check if the library is actually loaded by searching for a common function.
+    // Note: not using 'lookup' as its exception if not found is caught if
+    // All Exceptions is enabled in VS Code.
+    if (lib.providesSymbol('obx_version_is_at_least')) {
+      _lib = lib;
+      return ObjectBoxC(lib);
+    } else {
+      return null;
+    }
   } catch (_) {
     // ignore errors (i.e. symbol not found)
     return null;