linux下udp客户端源码示例

#include <errno.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <stdlib.h>
#include <string.h>
#include <netinet/in.h>
#include <stdio.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/socket.h>
typedef struct _NSS_HEADER
{
unsigned short ProtocolVersion; /* 协议版本信息 */
unsigned short MsgType; /* 消息类型 */
unsigned short TransactionNo; /* 传输编号 */
unsigned short PacketLength; /* 数据包长度,包括Header */
}NSS_HEADER;
int main(int argc, char **argv)
{
printf("client ip: %s\n", argv[1]);
printf("client port: %s\n", argv[2]);
printf("server ip: %s\n", argv[3]);
printf("server port: %s\n", argv[4]);
printf("\n service starting...\n\n");
int socketFd;
struct sockaddr_in svrAddr;
struct sockaddr_in localAddr;
socketFd = socket (AF_INET, SOCK_DGRAM, 0);
if ( -1 == socketFd )
{
perror( "socket:" );
exit(-1);
}
// 设置地址可复用
int option = 1;
setsockopt( socketFd, SOL_SOCKET, SO_REUSEADDR, &option, sizeof(option) );
// 客户端IP
memset(&localAddr, 0, sizeof(localAddr));
localAddr.sin_family = AF_INET;
localAddr.sin_addr.s_addr = inet_addr( argv[1]);
localAddr.sin_port = htons (atoi(argv[2]));
int bindResult = bind(socketFd, (struct sockaddr *) &localAddr, sizeof(localAddr));
if ( -1 == bindResult )
{
perror( "bind:" );
sleep(10);
close(socketFd);
exit(-1);
}
// 服务器IP
memset(&svrAddr, 0, sizeof(svrAddr));
svrAddr.sin_family = AF_INET;
svrAddr.sin_addr.s_addr = inet_addr( argv[3]);
svrAddr.sin_port = htons (atoi(argv[4]));
char tempBuff[2048] = {0};
// 每分钟发送一次数据
NSS_HEADER hdr;
memset( &hdr, 0, siz