小编TJM*_*TJM的帖子

我有一个VPS操作系统是CentOS6.3.我想startx通过PuTTY和Xming 运行.

但是,它产生了这个错误:

PuTTY X11 proxy: unable to connect to forwarded X server: Network error: Connection refused

整个条件:

Using username "root".
Authenticating with public key "rsa-key-20150906" from agent
Last login: Thu Jan 21 13:53:40 2016 from 222.222.150.82
[root@mairo ~]# xhost +
PuTTY X11 proxy: unable to connect to forwarded X server: Network error: Connection refused
xhost:  unable to open display "localhost:10.0"
[root@mairo ~]# echo $DISPLAY
localhost:10.0
[root@mairo ~]# gedit
PuTTY X11 proxy: unable to connect to forwarded X …

据说*C 中的运算符意味着"指向变量的指针",并且以下代码是合法的:

#include <stdio.h>
int main(){
    int a=5;
    int *p=&a;
    printf("%d\n", *p);
    return 0;
}

但以下代码是非法的:

#include<stdio.h>

struct pair{
    int a,b;
};

int main(){
    struct  pair Alice, *Bob=&Alice;
    Alice.a=1;
    Alice.b=2;
    printf("%d %d\n",*Bob.a,*Bob.b);
    return 0;
}

那么,为什么*运算符适用于指向普通变量的指针,但是对指向结构的指针不起作用？