Example: Boxed deserialization
public struct MyStruct {
public int64 a;
public int64 b;
public static void* deserialize_func (Json.Node node) {
assert (node.get_node_type () == Json.NodeType.OBJECT);
unowned Json.Object obj = node.get_object ();
assert (obj.get_size () == 2);
MyStruct* stru = malloc (sizeof (MyStruct));
stru.a = obj.get_int_member ("a");
stru.b = obj.get_int_member ("b");
return stru;
}
public string to_string () {
StringBuilder builder = new StringBuilder ();
builder.append_printf ("a: %" + int64.FORMAT + "\n", a);
builder.append_printf ("b: %" + int64.FORMAT, b);
return builder.str;
}
}
public static int main (string[] args) {
// Create a Node:
Json.Node node;
try {
string data = """{ "a" : 3, "b" : 4 }""";
Json.Parser parser = new Json.Parser ();
parser.load_from_data (data);
node = parser.get_root ();
} catch (Error e) {
assert_not_reached ();
}
// Check whether the struct is deserializeable:
// Output: ``deserializeable(1): false``
bool tmp = Json.boxed_can_deserialize (typeof (MyStruct), Json.NodeType.OBJECT);
print ("deserializeable(1): %s\n", tmp.to_string ());
// Register our BoxedDeserializeFunc:
Json.boxed_register_deserialize_func (typeof (MyStruct), Json.NodeType.OBJECT, MyStruct.deserialize_func);
// Check again:
// Output: ``deserializeable(2): true``
tmp = Json.boxed_can_deserialize (typeof (MyStruct), Json.NodeType.OBJECT);
print ("deserializeable(2): %s\n", tmp.to_string ());
// Deserialization:
// Output:
// ``a: 3``
// ``b: 4``
MyStruct* stru = (MyStruct*) Json.boxed_deserialize (typeof (MyStruct), node);
print (stru.to_string ());
print ("\n");
delete stru;
return 0;
}
valac --pkg json-glib-1.0 deserialization-boxed.vala
See:
