我无法将文件从Iphone设备（带wifi）FTP到远程FTP服务器。大多数时候，我会收到“流打开错误”，而很少的时候，文件会收到FTPed。但在检查FTP服务器时，上传的文件为空，即文件大小为0字节。但是上传的文件有一定的大小。
Note: i use active mode to FTP and FTP server to accept active connections so, where is the problem? Is there a problem with FTP server? Or is there a problem from the sender i.e is there a problem with the source code?
也许将传输模式从主动更改为被动会有所帮助。FTP使用两种连接——控制连接（用于发送命令）和数据连接（用于上传/下载/目录列表）。
在活动模式下，FTP服务器打开与FTP客户端的数据连接。它被大多数防火墙阻止。在被动模式下，FTP客户端打开与服务器的数据连接。有关详细信息，请参阅我们的关于FTP主动和被动模式差异的网页。
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