G_BEGIN_DECLS G_MODULE_EXPORT G_DECLARE_FINAL_TYPE(FlMethodChannel, fl_method_channel, FL, METHOD_CHANNEL, GObject) typedef void(*FlMethodChannelMethodCallHandler)(FlMethodChannel *channel
const uint8_t uint32_t uint32_t GError ** error
void fl_method_channel_invoke_method(FlMethodChannel *channel, const gchar *method, FlValue *args, GCancellable *cancellable, GAsyncReadyCallback callback, gpointer user_data)