1. 源碼

UDP服務端：

/** * @brief UDP服務端 * @author Mculover666 * @date 2020/04/15*/#include <stdio.h>#include <unistd.h>#include <sys/types.h>#include <sys/socket.h>#include <netinet/in.h>#include <arpa/inet.h>#include <stdlib.h>#include <string.h>int main(int argc, char* argv[]){ int server_sock_fd; struct sockaddr_in server_addr, client_addr; char recv_buf[100]; int nbytes = 0; socklen_t len = 0; /* 創建Server Socket */ server_sock_fd = socket(AF_INET, SOCK_DGRAM, 0); if (server_sock_fd < 0) { printf('服務端Socket創建失敗'); return -1; } printf('服務端Socket創建成功n'); /* 綁定ip和端口 */ bzero(&server_addr, sizeof(server_addr)); server_addr.sin_family = AF_INET; server_addr.sin_addr.s_addr = htonl(INADDR_ANY); server_addr.sin_port = htons(atoi(argv[1]));//指定端口號 bind(server_sock_fd, (struct sockaddr *) &server_addr, sizeof(server_addr)); printf('服務端Socket綁定成功n'); while(1) { /* 接收UDP客戶端的數據 */ printf('等待接收客戶端數據：n'); len = sizeof(client_addr); nbytes = recvfrom(server_sock_fd, recv_buf, 100, 0, (struct sockaddr *)&client_addr, &len); printf('okn'); recv_buf[nbytes] = ’0’; printf('recv %d bytes:%s.n', nbytes, recv_buf); //接收用戶輸入，發送給客戶端 printf('請輸入要發送給客戶端的數據:'); fgets(recv_buf, 100, stdin); sendto(server_sock_fd,recv_buf,strlen(recv_buf),0,(struct sockaddr *)&client_addr,len); } return 0;}

UDP客戶端：

/** * @brief UDP客戶端程序 * @author Mculover666 * @date 2020/04/15*/#include <stdio.h>#include <unistd.h>#include <sys/types.h>#include <sys/socket.h>#include <netinet/in.h>#include <arpa/inet.h>#include <stdlib.h>#include <string.h>int main(int argc, char* argv[]){ int sock_fd; struct sockaddr_in server_addr; char recv_buf[100]; int nbytes = 0; socklen_t len = 0; /* 創建Socket */ sock_fd = socket(AF_INET, SOCK_DGRAM, 0); if (sock_fd < 0) { printf('客戶端Socket創建失敗'); return -1; } /* 綁定ip和端口 */ bzero(&server_addr, sizeof(server_addr)); server_addr.sin_family = AF_INET; server_addr.sin_addr.s_addr = inet_addr(argv[1]); server_addr.sin_port = htons(atoi(argv[2]));//指定端口號 while(1) { len = sizeof(server_addr); //接收用戶輸入，發送給服務端 printf('請輸入要發送給服務端的數據:'); fgets(recv_buf, 100, stdin); sendto(sock_fd,recv_buf,100,0,(struct sockaddr *)(&server_addr),len);/* 接收UDP客戶端的數據 */ len = sizeof(server_addr); nbytes = recvfrom(sock_fd, recv_buf, 100, 0, (struct sockaddr *)&server_addr, &len); recv_buf[nbytes] = ’0’; printf('recv %d bytes:%s.n', nbytes, recv_buf); } return 0;}

2. 在本機運行結果

編譯：

gcc server.c -o srever_wangshiwei.ogcc client.c -o client_wangshiwei.o

運行：

3. 在開發板與PC之間運行結果

編譯：

gcc server.c -o srever_wangshiwei.oarm-linux-gnueabi-gcc client.c -o clientARM_wangshiwei.o

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