day36 1218
作业1：tftp
1 #include
2
3 //实现下载功能
4 int do_download(int cfd, struct sockaddr_in sin)
5 {
6 //定义变量存储下载请求包
7 char buf[516] = "";
8 //定义变量存储文件名
9 char fileName[40] = "";
10
11 printf("请输入文件名：");
12 scanf("%s", fileName);
13 getchar();
14
15 //组装请求包
16 short *p1 = (short *)buf;
17 *p1 = htons(1); //表明要下载
18
19 char *p2 = buf+2; //文件名段
20 strcpy(p2, fileName);
21
22 char *p4 = p2+strlen(p2)+1; //模式段
23 strcpy(p4, "octet");
24
25 int size = 4 + strlen(p2) + strlen(p4); //要发送数据的大小
26
27 //向服务器发送下载请求
28 if(sendto(cfd, buf, size, 0, (struct sockaddr*)&sin, sizeof(sin)) == -1)
29 {
30 perror("sendto error");
31 return -1;
32 }
33
34 printf("请求成功\n");
35
36 struct sockaddr_in newsin;
37 socklen_t socklen = sizeof(newsin);
38
39 int res = 0;
40 int fd = -1;
41 fd = open(fileName,O_WRONLY|O_CREAT|O_TRUNC,0664);
42 PERROR_INFO(fd);
43
44 //循环接收回复服务器发来的消息
45 while (1)
46 {
47 bzero(buf,sizeof(buf));
48 res = recvfrom(cfd,buf,sizeof(buf),0,(struct sockaddr *)&newsin,&socklen);
49
50 //printf("*p1 = %d\n",ntohs(*p1));
51
52 if (ntohs(*p1) == 3)
53 {
54 write(fd,buf+4,res-4);
55
56 buf[1] = 4;
57
58 if(sendto(cfd,buf,4,0,(struct sockaddr*)&newsin,sizeof(newsin)) == -1)
59 {
60 perror("sendto error");
61 return -1;
62 }
63 }
64 else if (buf[1] == 5)
65 {
66 printf("5 error\n");
67 return -1;
68 }
69
70 if (res < 516)
71 {
72 puts("file is clone over!!!");
73 close(fd);
74 break;
75 }
76
77 }
78
79 }
80
81 int main(int argc, const char *argv[])
82 {
83 if(argc != 2)
84 {
85 printf("input error\n");
86 printf("usage:./a.out ip\n");
87 return -1;
88 }
89
90 //1、创建套接字
91 int cfd = socket(AF_INET, SOCK_DGRAM, 0);
92 if(cfd == -1)
93 {
94 perror("socket error");
95 return -1;
96 }
97
98 //2、填充服务器地址信息结构体
99 struct sockaddr_in sin;
100 sin.sin_family = AF_INET;
101 sin.sin_port = htons(69);
102 sin.sin_addr.s_addr = inet_addr(argv[1]);
103
104 int mune = -1;
105 while(1)
106 {
107 system("clear"); //清屏
108 printf("\t\t======1、下载=======\n");
109 printf("\t\t======2、上传=======\n");
110 printf("\t\t======0、退出=======\n");
111
112 printf("请输入功能：");
113 scanf("%d", &mune);
114 getchar();
115
116 //多分支选择
117 switch(mune)
118 {
119 case 1:
120 {
121 do_download(cfd, sin);
122 }
123 break;
124
125 case 2:
126 {
127 //do_upload();
128 }
129 break;
130 case 0:
131 goto POS;
132 default:printf("输入功能有误，请重新输入\n");
133 }
134
135 //阻塞
136 printf("输入任意键，按回车清空:");
137 while(getchar() != '\n');
138
139 }
140
141 POS:
142 //关闭套接字
143 close(cfd);
144
145
146 return 0;
147 }
148
~
~
~
~
~ 效果
作业2： 控制机械臂
3 #define SERIP "192.168.125.32"
4
5 #define CLIPORT 6666
6 #define CLIIP "192.168.125.65"
7
8 int main(int argc, const char *argv[])
9 {
10 int ret = -1;
11 int cfd = -1;
12 cfd = socket(AF_INET,SOCK_STREAM,0);
13 PERROR_INFO(cfd);
14
15 printf("cfd = %d\n",cfd);
16
17
18 int reuse = 1;
19 ret = setsockopt(cfd,SOL_SOCKET,SO_REUSEADDR,&reuse,sizeof(reuse));
20 PERROR_INFO(ret);
21
22 /*
23 struct sockaddr_in cin;
24 cin.sin_family = AF_INET;
25 cin.sin_port = htons(CLIPORT);
26 cin.sin_addr.s_addr = inet_addr(CLIIP);
27
28 ret = bind(cfd,(struct sockaddr *)&cin,sizeof(cin));
29 PERROR_INFO(ret);
30 */
31
32 struct sockaddr_in sin;
33 sin.sin_family = AF_INET;
34 sin.sin_port = htons(SERPORT);
35 sin.sin_addr.s_addr = inet_addr(SERIP);
36
37 ret = connect(cfd,(struct sockaddr *)&sin,sizeof(sin));
38 PERROR_INFO(ret);
39
40
41 unsigned char blue_buf[5] = {0xff,0x02,0x01,90,0xff};
42 char red_buf[5] = {0xff,0x02,0x00,0,0xff};
43
44 while (1)
45 {
46 //bzero(wbuf,sizeof(wbuf));
47 char order = fgetc(stdin);
48 if (order == 'w'||order == 'W')
49 {
50 red_buf[3] += 5;
51 if (red_buf[3] > 90)
52 {
53 red_buf[3] = 90;
54 }
55 send(cfd,red_buf,sizeof(red_buf),0);
56 }
57 else if(order == 's' || order == 'S')
58 {
59 red_buf[3] -= 5;
60 if (red_buf[3] < -90)
61 {
62 red_buf[3] = -90;
63 }
64 send(cfd,red_buf,sizeof(red_buf),0);
65 }
66 else if (order == 'a' || order == 'A')
67 {
68 blue_buf[3] += 5;
69 if (blue_buf[3] > 180)
70 {
71 blue_buf[3] = 180;
72 }
73 send(cfd,blue_buf,sizeof(blue_buf),0);
74 }
75 else if (order == 'd' || order == 'D')
76 {
77
78 if (blue_buf[3] < 5)
79 {
80 blue_buf[3] = 0;
81 }
82 else
83 {
84 blue_buf[3] -= 5;
85 }
86 send(cfd,blue_buf,sizeof(blue_buf),0);
87 }
88
89
90
91
92
93 }
94 close(cfd);
95
96 return 0;
97 }
~ 思维导图