我正在尝试使用CodeIgniter中的FTP类上传文件。为此，我写了以下内容：
$this->load->library('ftp');
$config['hostname'] = '127.0.0.1';
$config['username'] = 'localftp';
$config['password'] = '';
$config['debug'] = TRUE;
$this->ftp->connect($config);
$this->ftp->upload($_FILES['book_file']['tmp_name'], asset_url()."books/" . $_FILES['book_file']['name'], "ascii", 0775);
$this->ftp->close();
但它显示给我：
无法上传指定的文件。请检查您的路径。
我正在使用XAMPP FileZilla连接到我的FTP主机。为此，我创建了localftp没有密码的用户。并且该用户具有主机上的所有权限。
这是我的本地XAMPP服务器日志记录：
(000016)24-Dec-13 23:27:05 PM - (not logged in) (127.0.0.1)> Connected, sending welcome message...
(000016)24-Dec-13 23:27:05 PM - (not logged in) (127.0.0.1)> 220-FileZilla Server version 0.9.41 beta
(000016)24-Dec-13 23:27:05 PM - (not logged in) (127.0.0.1)> 220-written by Tim Kosse ([email protected])
(000016)24-Dec-13 23:27:05 PM - (not logged in) (127.0.0.1)> 220 Please visit http://sourceforge.net/projects/filezilla/
(000016)24-Dec-13 23:27:05 PM - (not logged in) (127.0.0.1)> USER localftp
(000016)24-Dec-13 23:27:05 PM - (not logged in) (127.0.0.1)> 331 Password required for localftp
(000016)24-Dec-13 23:27:05 PM - (not logged in) (127.0.0.1)> PASS
(000016)24-Dec-13 23:27:05 PM - localftp (127.0.0.1)> 230 Logged on
(000016)24-Dec-13 23:27:05 PM - localftp (127.0.0.1)> PASV
(000016)24-Dec-13 23:27:05 PM - localftp (127.0.0.1)> 227 Entering Passive Mode (127,0,0,1,205,219)
(000016)24-Dec-13 23:27:05 PM - localftp (127.0.0.1)> TYPE A
(000016)24-Dec-13 23:27:05 PM - localftp (127.0.0.1)> 200 Type set to A
(000016)24-Dec-13 23:27:05 PM - localftp (127.0.0.1)> STOR http://localhost/International/public/books/ftpupload.pdf
(000016)24-Dec-13 23:27:05 PM - localftp (127.0.0.1)> 550 Filename invalid
(000016)24-Dec-13 23:27:05 PM - localftp (127.0.0.1)> disconnected.
在第二行的最后一行说550文件名无效。。我认为这是我的问题。请任何人帮助我解决此问题。
就在日志中：
(000016)24-Dec-13 23:27:05 PM - localftp (127.0.0.1)> STOR http://localhost/International/public/books/ftpupload.pdf
您正在尝试命名文件
http://localhost/International/public/books/ftpupload.pdf
这不是有效的文件名。
尝试删除asset_url()：
$this->ftp->upload($_FILES['book_file']['tmp_name'], "books/" . $_FILES['book_file']['name'], "ascii", 0775);
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