Obtain filename from file pointer in C [duplicate]

问题

This question already has answers here:

Closed 7 years ago.

Possible Duplicate:
Getting Filename from file descriptor in C
How get fileName having FILE*?

Is there any way where I can find the file_name from a file-pointer in C?

fp = fopen(file,"r");

From fp, is it possible to get the file name which I have opened?

回答1:

I believe not, because a file* could be to something that doesn't even have a name. There might be a platform dependent way, depending I. Your system, so if you don't care about portability, try looking at your compiler's definition of FILE if it has one. Odds are that your only way is to save the name when it's opened.

There are some other potentially hacky ways as well- check this link:

http://bytes.com/topic/c/answers/218921-how-get-filename-file-pointer

Cheers!

回答2:

See here for why this is hard, and can't be done in a portable way.

http://discuss.fogcreek.com/joelonsoftware5/default.asp?cmd=show&ixPost=179112

来源：https://stackoverflow.com/questions/9937645/obtain-filename-from-file-pointer-in-c