展开在其路径中具有环境变量的文件名 [英] expand file names that have environment variables in their path

问题描述

将
$ b

What's the best way to expand

${MyPath}/filename.txt to /home/user/filename.txt

或

%MyPath%/filename.txt to c:\Documents and settings\user\filename.txt

与遍历路径字符串直接查找环境变量？
我看到wxWidgets有一个 wxExpandEnvVars 函数。我不能在这种情况下使用wxWidgets，所以我希望找到一个boost :: filesystem等效或类似的。我只是使用主目录作为例子，我正在寻找通用的路径扩展。

with out traversing the path string looking for environement variables directly? I see that wxWidgets has a wxExpandEnvVars function. I can't use wxWidgets in this case, so I was hoping to find a boost::filesystem equivalent or similar. I am only using the home directory as an example, I am looking for general purpose path expansion.

推荐答案

对于UNIX最少POSIX）系统，请查看 wordexp ：

For UNIX (or at least POSIX) systems, have a look at wordexp:

#include <iostream>
#include <wordexp.h>
using namespace std;
int main() {
  wordexp_t p;
  char** w;
  wordexp( "$HOME/bin", &p, 0 );
  w = p.we_wordv;
  for (size_t i=0; i<p.we_wordc;i++ ) cout << w[i] << endl;
  wordfree( &p );
  return 0;
}

看起来它甚至会做类似glob的扩展对您的特殊情况有用）。

It seems it will even do glob-like expansions (which may or may not be useful for your particular situation).

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