9. 退出FTP服务器

//退出FTP服务器
int CFTP::ftp_quit() 
{ 
	sprintf_s(m_cmd,"QUIT
"); 
	int err = ftp_sendcmd(m_cmd,m_resp,sizeof(m_resp)); 
	if(err)
		return -1;
	//得到返回码
	int code = get_state_code(m_resp);
	//221 Goodbye.
	if(code != 221)
		return -1;	
	return 0; 
} 

退出FTP服务器通过发送命令QUIT实现。

10.  进入指定的FTP目录

//进入指定的FTP目录
int CFTP::ftp_cd( const char* dir )
{ 
	sprintf_s(m_cmd,"CWD %s
",dir);
	int err = ftp_sendcmd(m_cmd,m_resp,sizeof(m_resp)); 
	if(err)
		return -1;
	//得到返回码
	int code = get_state_code(m_resp);
	//250 CWD command successful.
	/*
	550-The system cannot find the file specified. 
	Win32 error:   The system cannot find the file specified. 
	Error details: File system returned an error.
	550 End
	*/
	if(code != 250)
		return -1;
	return 0; 
} 

通过命令CWD可以进入指定的FTP目录。

11.  返回上级FTP目录

//返回上级FTP目录
int CFTP::ftp_cdup() 
{ 
	sprintf_s(m_cmd,"CDUP
"); 
	int err = ftp_sendcmd(m_cmd,m_resp,sizeof(m_resp)); 
	if(err)
		return -1;
	//得到返回码
	int code = get_state_code(m_resp);
	//250 CDUP command successful.
	/*
	550-The system cannot find the file specified. 
	Win32 error:   The system cannot find the file specified. 
	Error details: File system returned an error.
	550 End
	*/
	if(code != 250)
		return -1;
	return 0; 
} 

返回上级目录通过命令CDUP实现。