How do I detect line number while reading a file?

7 次查看（过去 30 天）
Clay Fulcher
Clay Fulcher 2020-6-14
评论： Clay Fulcher 2020-6-15
Is there a way to detect the line number while reading a text file? ftell will give a pointer in the file, but not the line number.
Thanks

请先登录，再回答此问题。

采纳的回答

per isakson
per isakson 2020-6-15
There is no function that takes the output of ftell() and returns the line number.
One has to keep track of the line number with user code. However, that is hard to combine with the use of fseek().
  2 个评论
Walter Roberson
Walter Roberson 2020-6-15
The I/O systems used by Windows, Mac, and Linux, do not keep track of the line number. Anything keeping track of the line number would have to be layered on top of the I/O system.
The situation is more tricky than it first appears, since repositioning is permitted, and since it is (generally speaking) permitted to write in the middle of a file (which can change the line numbering for anything after that point), and multiple processes can write into the same file.
Clay Fulcher
Clay Fulcher 2020-6-15
Thanks Isakson and Walter. I guess I'll have to put a line counter in my code and keep track of the lines read that way.

请先登录，再进行评论。

更多回答（0 个）

类别

在 Help Center 和 File Exchange 中查找有关 Low-Level File I/O 的更多信息

标签

产品


版本

R2019a

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by