56 lines
1.2 KiB
C
56 lines
1.2 KiB
C
#include <stdio.h>
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#include <arpa/inet.h>
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#include <sys/socket.h>
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#include <netinet/in.h> // 地址结构
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#include <unistd.h>
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#include <string.h>
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int main(int argc, char const *argv[])
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{
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// 1. 创建套接字
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int sfd = socket(AF_INET, SOCK_DGRAM, 0);
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if (sfd < 0)
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{
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perror("socket");
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return -1;
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}
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// 2. 创建发送目标的ip地址和端口号
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struct sockaddr_in addr;
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bzero(&addr, sizeof(addr)); // 初始化置零
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addr.sin_family = AF_INET;
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addr.sin_port = htons(8000);
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inet_pton(AF_INET, "192.168.31.1", &addr.sin_addr.s_addr);
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int n = 1;
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// 3. 创建发送的数据
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while (1)
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{
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char buf[128] = "";
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scanf("%s", buf);
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if (strncmp(buf, "exit", 4) == 0)
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{
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break;
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}
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// sprintf(buf, "this is : %lld\n", (n++ * ++n));
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// 4. 发送一次 udp 数据
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ssize_t n = sendto(sfd, buf, strlen(buf), 0, (struct sockaddr *)&addr, sizeof(addr));
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if (n > 0)
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{
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printf("%s: 发送 udp 数据成功\n", buf);
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}
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else
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{
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printf("%s: 发送失败\n", buf);
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perror("sendto");
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}
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}
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// 5. 关闭 socket
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close(sfd);
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return 0;
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}
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