如何在C文件*结构得到一个文件名 [英] How to get a file's name from FILE* struct in C

问题描述

是否有可能在C检索文件的名字？如果一个文件像下面这样创建：

Is it possible to retrieve a file's name in C? If a file is created like the following:

     FILE *f = fopen ("foo.txt", "r");

与foo.txt的来自变量超出范围。有没有一种方法，从FILE结构找回？

And the "foo.txt" comes from a variable out of scope. Is there a way to retrieve it from the FILE struct?

推荐答案

您的无法的实际上是从检索文件名称; 文件对象。

You can't in fact retrieve the file names from your FILE objects.

不过，如果被传递给名称的fopen 对你很重要，而该变量超出范围是什么原因，你总是可以换一个 FILE * 在结构，即

However, if the name being passed to fopen is important to you, and that variable is out of scope for whatever reason, you could always wrap a FILE* in a struct, ie.

struct file_with_name {
   FILE *f;
   char *name; /* OR char name[MAX] */
}

至少这就是我想要做的，但要看是什么你实际上是试图做的。

At least that's what I'd do but it depends on what you're actually trying to do.

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