C + + Linux determines if a file exists

1, whether the folder exists:

Determine if the folder was opened successfully.

DIR *dir;      if ((dir = opendir(path)) == NULL)      {          return 0;      }

    closedir(dir);




2, whether the file exists:

 #include <unistd.h>
defining functions
    int Access (const char * pathname, int mode);

No Save:

R_OK: Just detect whether the current user has a readable permission;

W_OK: similar to R_OK;

X_OK: Check whether the current user has a readable writable executable permission on the file;

F_OK: Check whether the file exists;

Returns 0 if the permission detection is successful;

It is much simpler to judge whether a file exists in 3,java;

String path= "XXXXX";

File Fl=new file (path);

Return fl.exists ();

C + + Linux determines if a file exists