C++ 从 fstream 获取文件名（或路径）
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Getting filename (or path) from fstream
提问by Pavel Oganesyan
Can I get a file name or its path from a fstreamobject? I looked through the methods of fstreamand didn't find anything close to it.
我可以从fstream对象中获取文件名或其路径吗？我查看了 的方法fstream并没有找到任何接近它的方法。
采纳答案by Nawaz
No, that is not possible, not at least in the Standard conformant implementation of the library.
不，这是不可能的，至少在符合标准的库实现中是不可能的。
The fstream class doesn't store the filename, and doesn't provide any function for retrieving it.
fstream 类不存储文件名，也不提供任何检索它的函数。
So one way to keep track of this information is to use std::mapas:
因此，跟踪此信息的一种方法是将其std::map用作：
std::map<std::fstream*, std::string> stream_file_table;
void f()
{
//when you open a file, do this:
std::fstream file("somefile.txt");
stream_file_table[&file] = "somefile.txt"; //store the filename
//..
g(file);
}
void g(std::fstream & file)
{
std::string filename = stream_file_table[&file]; //get the filename
//...
}
Or, simply pass around the filename as well.
或者，也简单地传递文件名。
回答by Walter
you may also design a little class which inherits from fstreamand behaves like a fstreambut also stores its file name.
您还可以设计一个小类，它继承自 afstream并且其行为类似于 afstream但也存储其文件名。
