静态成员函数运用在CALLBACK函数和线程函数中《转载》
CALLBACK函数要声明称 static或全局,而在静态的函数中药调用非静态成员还不能调用,必须把这些成员也设置成静态的,不怎么方便,有好的解决方法吗。
其原因是把CALLBACK函数封装成C++类的非静态成员后,需要有建 立对象,再通过对象才能去找到这个成员函数。而系统调用这个CALLBACK函数的时候,才不管你有没有建立对象呢。典型的解决方法是需要用静态成员函数 给系统CALL。然后设法把THIS指针传给这个STATIC函数,让这个STATIC函数通过THIS指针访问到当前对象里的成员函数,那么这个成员函 数就可以轻松操作所有成员变量了。这种方法适用于所有系统CALLBACK。
以CreateThread为例,
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如果在ThreadCallback函数里拿到this指针后,通过this指针去访问对象里的东西也是可以的,就不需要多一个 MyProc函数了。但是MyProc可以直接引用所有成员变量,而ThreadCallback里每次都得用this->xxxx访问,多一次地 址跳转,在效率上会比MyProc里直接调用稍低一些。所以还是推荐用上面代码的实现方式
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