Given a path, say, /home/shree/path/def, I would want to determine if def is a directory or a file. Is there a way of achieving this in C or C++ code?
给定一个路径,例如/home/shree/path/def,我想确定def是一个目录还是一个文件。在C或c++代码中有没有实现这个的方法?
4 个解决方案
#1
35
The following code uses the stat()
function and the S_ISDIR
('is a directory') and S_ISREG
('is a regular file') macros to get information on the file. The rest is just error checking and enough to make a complete compilable program.
下面的代码使用stat()函数和S_ISDIR ('is a directory')和S_ISREG ('is a regular file')宏来获取文件信息。其余的只是错误检查,足以组成一个完整的可编译程序。
#include <stdio.h>
#include <errno.h>
#include <sys/stat.h>
int main (int argc, char *argv[]) {
int status;
struct stat st_buf;
// Ensure argument passed.
if (argc != 2) {
printf ("Usage: progName <fileSpec>\n");
printf (" where <fileSpec> is the file to check.\n");
return 1;
}
// Get the status of the file system object.
status = stat (argv[1], &st_buf);
if (status != 0) {
printf ("Error, errno = %d\n", errno);
return 1;
}
// Tell us what it is then exit.
if (S_ISREG (st_buf.st_mode)) {
printf ("%s is a regular file.\n", argv[1]);
}
if (S_ISDIR (st_buf.st_mode)) {
printf ("%s is a directory.\n", argv[1]);
}
return 0;
}
Sample runs are shown here:
样本运行如下:
pax> vi progName.c ; gcc -o progName progName.c ; ./progName
Usage: progName
where is the file to check.
pax> ./progName /home
/home is a directory.
pax> ./progName .profile
.profile is a regular file.
pax> ./progName /no_such_file
Error, errno = 2
#2
9
Use the stat(2) system call. You can use the S_ISREG or S_ISDIR macro on the st_mode field to see if the given path is a file or a directory. The man page tells you about all the other fields.
使用stat(2)系统调用。您可以在st_mode字段上使用S_ISREG或S_ISDIR宏来查看给定路径是文件还是目录。手册页告诉你所有其他的字段。
#3
5
What about using the boost::filesystem library and its is_directory(const Path& p) ? It may take a while to get familiar with, but not so much. It probably worths the investment, and your code will not be platform specific.
如何使用boost::文件系统库及其is_directory(const path&p) ?这可能需要一段时间来熟悉,但不是很多。它可能值得投资,并且您的代码不会是特定于平台的。
#4
-1
Alternatively you can use system() function with in built shell command "test".
system returns the exit status of command last executed
您也可以使用system()函数和内置shell命令“test”。系统返回最后执行的命令的退出状态
string test1 = "test -e filename" ; if(!system(test1)) printf("filename exists") ; string test2 = "test -d filename" ; if(!system(test2)) printf("filename is a directory") ; string test3 = "test -f filename" ; if(!system(test3)) printf("filename is a normal file") ;
but I am afraid this would work only on linux..
但我担心这只适用于linux。
#1
35
The following code uses the stat()
function and the S_ISDIR
('is a directory') and S_ISREG
('is a regular file') macros to get information on the file. The rest is just error checking and enough to make a complete compilable program.
下面的代码使用stat()函数和S_ISDIR ('is a directory')和S_ISREG ('is a regular file')宏来获取文件信息。其余的只是错误检查,足以组成一个完整的可编译程序。
#include <stdio.h>
#include <errno.h>
#include <sys/stat.h>
int main (int argc, char *argv[]) {
int status;
struct stat st_buf;
// Ensure argument passed.
if (argc != 2) {
printf ("Usage: progName <fileSpec>\n");
printf (" where <fileSpec> is the file to check.\n");
return 1;
}
// Get the status of the file system object.
status = stat (argv[1], &st_buf);
if (status != 0) {
printf ("Error, errno = %d\n", errno);
return 1;
}
// Tell us what it is then exit.
if (S_ISREG (st_buf.st_mode)) {
printf ("%s is a regular file.\n", argv[1]);
}
if (S_ISDIR (st_buf.st_mode)) {
printf ("%s is a directory.\n", argv[1]);
}
return 0;
}
Sample runs are shown here:
样本运行如下:
pax> vi progName.c ; gcc -o progName progName.c ; ./progName
Usage: progName
where is the file to check.
pax> ./progName /home
/home is a directory.
pax> ./progName .profile
.profile is a regular file.
pax> ./progName /no_such_file
Error, errno = 2
#2
9
Use the stat(2) system call. You can use the S_ISREG or S_ISDIR macro on the st_mode field to see if the given path is a file or a directory. The man page tells you about all the other fields.
使用stat(2)系统调用。您可以在st_mode字段上使用S_ISREG或S_ISDIR宏来查看给定路径是文件还是目录。手册页告诉你所有其他的字段。
#3
5
What about using the boost::filesystem library and its is_directory(const Path& p) ? It may take a while to get familiar with, but not so much. It probably worths the investment, and your code will not be platform specific.
如何使用boost::文件系统库及其is_directory(const path&p) ?这可能需要一段时间来熟悉,但不是很多。它可能值得投资,并且您的代码不会是特定于平台的。
#4
-1
Alternatively you can use system() function with in built shell command "test".
system returns the exit status of command last executed
您也可以使用system()函数和内置shell命令“test”。系统返回最后执行的命令的退出状态
string test1 = "test -e filename" ; if(!system(test1)) printf("filename exists") ; string test2 = "test -d filename" ; if(!system(test2)) printf("filename is a directory") ; string test3 = "test -f filename" ; if(!system(test3)) printf("filename is a normal file") ;
but I am afraid this would work only on linux..
但我担心这只适用于linux。