C ++：我需要目录导航方面的帮助

Question

So, I want to be ableto chdir into a directory, if it exists, if not make the directory. If I am already in the directory, I just don't need to do anything.

Example

if (cur_dir == "dir_name")
// do stuff
else if ("dir_name" not exist?)
   mkdir "dir_name"
   chdir "dir_name"
else
   chdir "dir_name"

I've been googling, I've come up with this so far:

if (chdir(Config::CONFIG_FOLDER_NAME) == 0)
{
    std::cout << "Network Config Directory not found...\n";
    std::cout << "Creating folder called " << Config::CONFIG_FOLDER_NAME << "\n";
    mkdir(Config::CONFIG_FOLDER_NAME, 0777);
}

I haven't yet found a way to check to see what the current directory is.. (not the full path, which is what I did find.)

Answer 1

If you have Boost, you can use Boost.Filesystem :

namespace fs = boost::filesystem;

fs::path configFolder(Config::CONFIG_FOLDER_NAME);

// Check if the current directory isn't already config folder
if (!fs::equivalent(configFolder, fs::current_path())
{
    // Create config folder if it doesn't exist
    if (!fs::exists(configFolder))
       fs::create_directory(configFolder);

    // Change working directory to config folder
    fs::current_path(configFolder);
}

By the way, if you're just planning to read a config file, you shouldn't need to change the working directory. Just read directly, using an absolute path. In Boost.Filesystem, you'd do that this way:

fs::path configFilePath = configFolder;
configFilePath /= "config.file";

// read configFilePath

Answer 2

如果您具有完整的路径，则只需解析它，然后查看最后一段（最后一个“ /”之后的部分）。

Answer 3

我认为getcwd（）是您所需要的。