Linux UDP简单封装

//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));
/* 协议地址组包 */
dest_addr.sin_family = AF_INET; /* 协议名 */
dest_addr.sin_addr.s_addr = htonl(destIP); /* 自动分配地址 */
dest_addr.sin_port = htons(destPort); /* 端口号 */
/* 组装系统调用socket和bind */

if((sock_fd = socket(AF_INET, SOCK_DGRAM, 0)) < 0)
{
perror(strerror(errno));
exit(0);
}
/* 创建UDP套接字描述符 */
if(bind(sock_fd, (struct sockaddr *)&local_addr, sizeof(local_addr)) < 0 ) /* 命名套接字 */
{
perror(strerror(errno));
exit(0);
} // return 0; /* 准备成功，正确返回 */
//assert(close(*pnSock) == 0); /* 准备失败，关闭套接字描述符 */
//return 1;
}

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