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 2. G_DEFINE_TYPE用法 https://www.codenong.com/cs106693497/  
 3. G_DEFINE_TYPE用法 https://blog.csdn.net/evsqiezi/article/details/83049655
 4. g_type_register_static_simple(type, "A", sizeof(A_class), A_class_init, sizeof(A), A_init, 0LL);
+5. typedef int (*pFunc_t)(char *frame, int len);//定义了一个类型pFunc_t 定义函数指针类型
+6. gulong g_signal_connect_closure_by_id ( GObject* instance, guint signal_id, GQuark detail, GClosure* closure, gboolean after ) 连接信号对象 The handler ID (always greater than 0)


 ## https://docs.sailfishos.org/Reference/Architecture/