C++ 仅列出目录中的文件夹
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Listing only folders in directory
提问by m4tx
I want to list folders in a directory in C++, ideally in a portable (working in the major Operating Systems) way. I tried using POSIX, and it works correctly, but how can i identify whether the found item is a folder?
我想在 C++ 中列出目录中的文件夹，最好以可移植的方式（在主要操作系统中工作）。我尝试使用 POSIX，它工作正常，但是我如何确定找到的项目是否是文件夹？
采纳答案by wally
Using the C++17 std::filesystemlibrary:
使用 C++17std::filesystem库：
std::vector<std::string> get_directories(const std::string& s)
{
std::vector<std::string> r;
for(auto& p : std::filesystem::recursive_directory_iterator(s))
if (p.is_directory())
r.push_back(p.path().string());
return r;
}
回答by davidag
You could use opendir()and readdir()to list directories and subdirectories. The following example prints all subdirectories inside the current path:
您可以使用opendir()和readdir()列出目录和子目录。以下示例打印当前路径内的所有子目录：
#include <dirent.h>
#include <stdio.h>
int main()
{
const char* PATH = ".";
DIR *dir = opendir(PATH);
struct dirent *entry = readdir(dir);
while (entry != NULL)
{
if (entry->d_type == DT_DIR)
printf("%s\n", entry->d_name);
entry = readdir(dir);
}
closedir(dir);
return 0;
}
回答by Beno?t
Here follows a (slightly modified) quote from the boost filesystem documentationto show you how it can be done:
下面是来自boost 文件系统文档的（稍微修改的）引用，向您展示如何完成它：
void iterate_over_directories( const path & dir_path ) // in this directory,
{
if ( exists( dir_path ) )
{
directory_iterator end_itr; // default construction yields past-the-end
for ( directory_iterator itr( dir_path );
itr != end_itr;
++itr )
{
if ( is_directory(itr->status()) )
{
//... here you have a directory
}
}
}
}
回答by Graeme Perrow
Look up the statfunction. Hereis a description. Some sample code:
查stat函数。这里有一个说明。一些示例代码：
struct stat st;
const char *dirname = "dir_name";
if( stat( dirname, &st ) == 0 && S_ISDIR( st.st_mode ) ) {
// "dir_name" is a subdirectory of the current directory
} else {
// "dir_name" doesn't exist or isn't a directory
}
回答by James
I feel compelled to mention PhysFS. I just integrated it into my own project. It provides true cross-platform (Mac / Linux / PC) file operations and can even unpack various archive definitions such as zip, 7zip, pak, and so on. It has a few functions (PHYSFS_isDirectory, PHYSFS_enumerateFiles) which can determine what you are asking for as well.
我觉得不得不提到PhysFS。我只是将它集成到我自己的项目中。它提供了真正的跨平台（Mac / Linux / PC）文件操作，甚至可以解压各种压缩文件定义，例如 zip、7zip、pak 等。它有一些功能（PHYSFS_isDirectory、PHYSFS_enumerateFiles），它们也可以确定您的要求。
回答by Jeremy Friesner
Under Windows, you can use _findfirst() and _findnext() to iterate through the contents of a directory, and then use CreateFile() and GetFileInformationByHandle() to determine whether a particular entry is a directory or a folder. (Yes, CreateFile(), with the appropriate arguments, to examine an existing file. Ain't life grand?)
在 Windows 下，您可以使用 _findfirst() 和 _findnext() 遍历目录的内容，然后使用 CreateFile() 和 GetFileInformationByHandle() 确定特定条目是目录还是文件夹。（是的，使用适当的参数 CreateFile() 来检查现有文件。是不是很美好？）
For reference, some classes where I implemented code that uses those calls can be seen hereand here
