FTP的C++实现

被动方式 ,连接FTP，然后上传下载文件。
linux下连接，源码如下：
FTP.h
[cpp]
#ifndef FTP_H_
#define FTP_H_
#include <sys/types.h>
#include <sys/socket.h>

class CFTP
{
public:
    CFTP(void);
    ~CFTP(void);
    //连接ftp服务器
    int ftp_connect(const char* ip);
    //登录ftp服务器
    int ftp_login(char* user,char* pass);
    //显示当前目录
    int ftp_pwd(char* buff);
    //更改目录
    int ftp_cd(char* dir);
    //返回上层目录
    int ftp_cdup();
    //创建目录
    int ftp_mkdir(char* dir);
    //删除目录
    int ftp_rmdir(char* dir);
    //数据传输模式
    int ftp_setpasv();
    //上传文件
    int ftp_upload(char* localfile,char* remotepath,char* remotefilename);
    //下载文件
    int ftp_download(char* localfile,char* remotefile);
    //退出登录
    int ftp_quit();

private:
    int m_sockctrl;//控制连接socket
    int m_sockdata;//数据连接socket
    char m_cmd[256];//存放指令
    char m_resp[256];//存放返回语句
    char m_ip[64];//保存ip

    int ftp_sendcmd();//发送指令
    int ftp_checkresp(char expresp);//接收返回状态，检测是否成功
    int ftp_mkdirSingle(char* dir);
};
#endif

FTP.cpp

[cpp]
#include <iostream>
#include <netinet/in.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>

#include "FTP.h"

using namespace std;

CFTP::CFTP(void)
{

}

CFTP::~CFTP(void)
{

}

int CFTP::ftp_checkresp(char expresp)
{
    int len = recv(m_sockctrl,m_resp,256,0);
    if(-1 == len)return -1;
    m_resp[len]=0;
    puts(m_resp);//应该保存ftp运行日志
    if(m_resp[0]!=expresp)return -1;
    return 0;
}

int CFTP::ftp_sendcmd()
{
    int ret = send(m_sockctrl,m_cmd,strlen(m_cmd),0);
    if(-1 == ret)return -1;
    return 0;
}

int CFTP::ftp_connect(const char* ip)
{
    m_sockctrl = socket(AF_INET,SOCK_STREAM,0);
    if(0==m_sockctrl)return -1;
    struct sockaddr_in addr;
    addr.sin_family = AF_INET;
    addr.sin_port = htons(21);
    addr.sin_addr.s_addr = inet_addr(ip);
    int err = connect(m_sockctrl,(sockaddr*)&addr,sizeof(addr));
    if(err)return -1;
    err = ftp_checkresp('2');
    if(err)return -1;
    return 0;
}

int CFTP::ftp_login(char* user,char* pass)
{
    sprintf(m_cmd,"USER %s\r\n",user);
    int err = ftp_sendcmd();
    if(err)return -1;
    err = ftp_checkresp('3');
    if(err)return -1;
    sprintf(m_cmd,"PASS %s\r\n",pass);
    err = ftp_sendcmd();
    if(err)return -1;
    err = ftp_checkresp('2');
    if(err)return -1;
    return 0;
}

int CFTP::ftp_quit()
{
    sprintf(m_cmd,"QUIT\r\n");
    int err = ftp_sendcmd();
    if(err)return -1;
    err = ftp_checkresp('2');
    if(err)return -1;
    return 0;
}
int CFTP::ftp_cd(char* dir)
{
    sprintf(m_cmd,"CWD %s\r\n",dir);
    int err = ftp_sendcmd();
    if(err)return -1;
    err = ftp_checkresp('2');
    if(err)return -1;
    return 0;
}

int CFTP::ftp_cdup()
{
    sprintf(m_cmd,"CDUP\r\n");
    int err = ftp_sendcmd();
    if(err)return -1;
    err = ftp_checkresp('2');
    if(err)return -1;
    return 0;
}

int CFTP::ftp_pwd(char* buff)
{
    sprintf(m_cmd,"PWD\r\n");
    int err = ftp_sendcmd();
    if(err)return -1;
    err = ftp_checkresp('2');
    if(err)return -1;
    char* p=m_resp;
    while(*p)
    {
        if(*p++ == '"')
            while(*p!='"')
                *buff++=*p++;
    }
    *buff=0;
    printf("current work directory is : %s\n",buff);
    return 0;
}
int CFTP::ftp_mkdirSingle(char* dir)
{
    sprintf(m_cmd,"MKD %s\r\n",dir);
    int err = ftp_sendcmd();
    if(err)return -1;
    err = ftp_checkresp('2');
    if(err)return -1;
    return 0;
}
int CFTP::ftp_mkdir(char* dir)
{
    char path[300];
    int err = ftp_cd("/");
    if(err)return -1;
    int i,j;
// printf("strlen(dir):%d",strlen(dir));
    for(i=1,j=0;i<strlen(dir);i++)   //第一个字节是根目录
    {
   &nb

补充：软件开发 , C++ ,