C语言 检查文件是目录还是文件
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原文地址: http://stackoverflow.com/questions/4553012/
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Checking if a file is a directory or just a file
提问by Jookia
I'm writing a program to check if something is a file or is a directory. Is there a better way to do it than this?
我正在编写一个程序来检查某些东西是文件还是目录。有没有比这更好的方法呢？
#include <stdio.h>
#include <sys/types.h>
#include <dirent.h>
#include <errno.h>
int isFile(const char* name)
{
DIR* directory = opendir(name);
if(directory != NULL)
{
closedir(directory);
return 0;
}
if(errno == ENOTDIR)
{
return 1;
}
return -1;
}
int main(void)
{
const char* file = "./testFile";
const char* directory = "./";
printf("Is %s a file? %s.\n", file,
((isFile(file) == 1) ? "Yes" : "No"));
printf("Is %s a directory? %s.\n", directory,
((isFile(directory) == 0) ? "Yes" : "No"));
return 0;
}
回答by Frédéric Hamidi
You can call the stat()function and use the S_ISREG()macro on the st_modefield of the statstructure in order to determine if your path points to a regular file:
您可以调用stat()函数并在stat结构S_ISREG()的st_mode字段上使用宏，以确定您的路径是否指向常规文件：
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
int is_regular_file(const char *path)
{
struct stat path_stat;
stat(path, &path_stat);
return S_ISREG(path_stat.st_mode);
}
Note that there are other file types besides regularand directory, like devices, pipes, symbolic links, sockets, etc. You might want to take those into account.
请注意，除了常规和目录之外，还有其他文件类型，如设备、管道、符号链接、套接字等。您可能需要考虑这些。
回答by ismail
Use the S_ISDIRmacro:
使用S_ISDIR宏：
int isDirectory(const char *path) {
struct stat statbuf;
if (stat(path, &statbuf) != 0)
return 0;
return S_ISDIR(statbuf.st_mode);
}
回答by KARASZI István
Yes, there is better. Check the stator the fstatfunction
是的，还有更好的。检查stat或fstat功能
回答by R.. GitHub STOP HELPING ICE
Normally you want to perform this check atomically with using the result, so stat()is useless. Instead, open()the file read-only first and use fstat(). If it's a directory, you can then use fdopendir()to read it. Or you can try opening it for writing to begin with, and the open will fail if it's a directory. Some systems (POSIX 2008, Linux) also have an O_DIRECTORYextension to openwhich makes the call fail if the name is not a directory.
通常，您希望使用结果以原子方式执行此检查，因此stat()无用。相反，open()文件首先是只读的，然后使用fstat(). 如果它是一个目录，则可以使用fdopendir()它来读取它。或者您可以尝试打开它开始写入，如果它是目录，则打开将失败。某些系统（POSIX 2008、Linux）也有一个O_DIRECTORY扩展名，open如果名称不是目录，则调用失败。
Your method with opendir()is also good if you want a directory, but you should not close it afterwards; you should go ahead and use it.
opendir()如果你想要一个目录，你的方法也很好，但之后你不应该关闭它；你应该继续使用它。
