Linux UDP¼òµ¥·â×°

//CUdp.h
#ifndef MY_CUDP
#define MY_CUDP
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <unistd.h>
class CUdp{
public:
CUdp(const char* destIP, unsigned short localPort, unsigned short destPort);
CUdp(unsigned int destIP, unsigned short localPort, unsigned short destPort);
int sendData(void *data, unsigned int length);
int recvData(void *data, unsigned int length,unsigned int &inIP,unsigned short& inPort);
~CUdp(){close(sock_fd);}
private:
int sock_fd;
struct sockaddr_in local_addr;
struct sockaddr_in dest_addr;
};
#endif
//CUdp.cpp
#include "CUdp.h"
#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#include <errno.h>
#include <assert.h>
#include <arpa/inet.h>

CUdp::CUdp(unsigned int destIP,unsigned short localPort, unsigned short destPort)
{
memset(&local_addr,0,sizeof(local_addr));
local_addr.sin_family = AF_INET;
local_addr.sin_addr.s_addr = htonl(INADDR_ANY);
local_addr.sin_port = htons(localPort);

memset(&dest_addr, 0, sizeof(dest_addr));
/* ЭÒéµØÖ·×é°ü */
dest_addr.sin_family = AF_INET; /* ЭÒéÃû */
dest_addr.sin_addr.s_addr = htonl(destIP); /* ×Ô¶¯·ÖÅäµØÖ· */
dest_addr.sin_port = htons(destPort); /* ¶Ë¿ÚºÅ */
/* ×éװϵͳµ÷ÓÃsocketºÍbind */

if((sock_fd = socket(AF_INET, SOCK_DGRAM, 0)) < 0)
{
perror(strerror(errno));
exit(0);
}
/* ´´½¨UDPÌ×½Ó×ÖÃèÊö·û */
if(bind(sock_fd, (struct sockaddr *)&local_addr, sizeof(local_addr)) < 0 ) /* ÃüÃûÌ×½Ó×Ö */
{
perror(strerror(errno));
exit(0);
} // return 0; /* ×¼±¸³É¹¦£¬ÕýÈ··µ»Ø */
//assert(close(*pnSock) == 0); /* ×¼±¸Ê§°Ü£¬¹Ø±ÕÌ×½Ó×ÖÃèÊö·û */
//return 1;
}

CUdp::CUdp(const char* destIP, unsigned short localPort, unsigned short destPort)
{
memset(&local_addr,0,sizeof(local_addr));
local_addr.sin_fami