第七根弦的技术博客

写来一个UDP发送和接受数据包的程序.

客户端代码:

client_main.c:
/*
* @file client_main.c
* @brief client of the UDP.
* @author xiaou
*/

int main(int argc, char *argv[])
{
if(argc < 2) { printf("One argument at least!\n"); return -1; } int res = 0; int sock_fd = socket(PF_INET, SOCK_DGRAM, 0); if(sock_fd < 0) { printf("error: Create Socket Failed!"); return -1; } struct sockaddr_in sock_addr; sock_addr.sin_family = AF_INET; sock_addr.sin_port = htons(4321); sock_addr.sin_addr.s_addr = htonl(INADDR_ANY); memset(sock_addr.sin_zero, 0x00, 8); try { const char * tos = argv[1]; int toslen = strlen(tos) + 1; struct sockaddr_in to = sock_addr; uint32_t tolen = sizeof(struct sockaddr); printf("\nSending for data...\n"); if((toslen = sendto(sock_fd, tos, toslen, 0, (struct sockaddr *)&to, tolen)) == -1) { printf("error: Sending Failed!"); res = -1; throw res; } else { char s[256]; strncpy(s, tos, toslen); printf("Sended data:\n[%s]\n\n", s); } } catch(...) { printf("error catched~"); } close(sock_fd); return res; }
服务端代码:

server_main.c:

int main(int argc, char *argv[])
{
int res = 0;
int sock_fd = socket(PF_INET, SOCK_DGRAM, 0);
if(sock_fd < 0) { printf("error: Create Socket Failed!"); return -1; } struct sockaddr_in sock_addr; sock_addr.sin_family = AF_INET; sock_addr.sin_port = htons(4321); sock_addr.sin_addr.s_addr = htonl(INADDR_ANY); memset(sock_addr.sin_zero, 0x00, 8); try { if(bind(sock_fd, (struct sockaddr *)&sock_addr, sizeof(struct sockaddr)) != 0) { printf("error: Bind Socket Failed!"); res = -1; throw res; } char recvs[256]; int recvslen; struct sockaddr_in from; uint32_t fromlen; while(1) { printf("\nWaiting for data...\n"); fromlen = sizeof(struct sockaddr); if((recvslen = recvfrom(sock_fd, recvs, 256, 0, (struct sockaddr *)&from , &fromlen)) == -1) { printf("error: Receiving Failed!"); res = -1; throw res; } else { if(recvslen < 256) *(recvs+recvslen) = '\0'; else *(recvs+255) = '\0'; printf("Received data:\n[%s]\n",recvs); } } } catch(...) { printf("error catched~"); } close(sock_fd); return res; }
Makefile代码:

Makefile:

clean:
rm -rf $(OutPath4UDPClient)
rm -rf $(OutPath4UDPServer)