12. 得到当前所在的FTP目录

int CFTP::ftp_pwd( char* buff )
{ 
	sprintf_s(m_cmd,"PWD
"); 
	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);
	//257 "/" is current directory.
	/*
	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 != 257)
		return -1;

	char* p=m_resp; 
	while(*p) 
	{ 
		if(*p == '"'){ 
			++p;
			while(*p != '"') 
				*buff++=*p++;
		}
		++p;
	} 
	*buff=0; 
	printf("current work directory is : %s
",buff); 
	return 0; 
}

使用PWD命令获取当前所在的FTP目录，如果返回码是257，表示命令执行成功，再使用recv函数获取字符串形式的ftp目录。

13. 创建单个文件夹

int CFTP::ftp_mkdirSingle( const char* dir )
{ 
	sprintf_s(m_cmd,"MKD %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);
	//257 "20150110" directory created.	 
	if(code != 257)
		return -1;	
	return 0; 
} 

使用MKD命令创建文件夹，创建成功的返回码是257。