最近在项目中要用到FTP上传，用的是delphi的IdFTP控件，用IdFtp.List(list),发现List里面有内容，可 是到IdFtp.DirectoryListing.Items[iCount].ItemType=ditDirectory却出现越界的错误，而 DirectoryListing .ListResult中却有内容，取出IdFtp.DirectoryListing.count确为0，惊讶了。琢磨了很久 ，这是查的一个关于DirectoryListing 的资料。
最后发现由于D7以后的版本的intra控件升级，管理方式变了，需要在调用的单元是加一个文件IdAllFTPListParsers才搞定。现在贴出来，让大家少走点弯路。
看了一下网上的代码都是List完了就直接用，DirectoryListing会自动解析ListResult
放狗搜了半天，终于找到原因，原来是Indy10的一个设计上的变化，以下引用官网内容：
TIdFTP.DirectoryListing is returning nothing for my FTP server. Why?
We restructured the way FTP directory listing is done. The code is now a plug in system with various parsers in their own units which register themselves into a framework. To add support for a particular type of FTP server, you simply add the parser unit to one of your program unit’s uses clause.
To add the Unix directory list parser, add IdFTPListParseUnix to your unit’s clause. To add support for Microsoft Windows NT IIS FTP server, add IdFTPListParseWindowsNT to your uses clause. You can also add many other parsers we include in the Indy packages. By convention, they are named IdFTPListParser followed by the server type. You do not need to add IdFTPListParseBase to your uses clause because IdFTP uses that unit. If you wish to use all of Indy’s FTP List parser classes, just add the IdAllFTPListParsers unit to your uses clause.
We admit this new design is not as intuitive as the older one but this has many advantages for us such as:
• The FTP list parsing code is now much easier to maintain than the same code in a non-modular design in one unit which would be at least 150KB total.
• You now can add support for only the FTP servers you want your program support to support.
• You can now write your own custom parser classes and plug those into the standard FTP parsing list framework.
转自：http://hi.baidu.com/ningj123/item/1a1a1acfdb842063f6c95d2a
