QTcpsocket 实现FTP

http://blog.163.com/modingfa_002/blog/static/1109254662013111510358109/

http://baike.baidu.com/link?url=Z6FpaB_q4GCj5CkKNUNdRjNK2GgwTxNUfxeHwg1EAM5uPyJrn_We2QMXGWx5S1TP-bBNsJq61Wlh_pVnoTlSqq

https://www.ibm.com/developerworks/cn/linux/l-cn-socketftp/

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原文地址:https://www.cnblogs.com/L-Arikes/p/4807703.html