visual c++ - Windows with mapped drive -- _stat() fails to detect existence of the file -

summary: _stat() function says there not existing file when drive letter mapped unc path.

details: on windows system, there unc path

\\computer\sharename\disk_m\the_subdir\file.txt 

and mapped way:

net use m: \\computer\sharename\disk_m 

then file.txt can accessed m:\the_subdir\file.txt, , can see content in editor.

the problem need test file existence in program. use following function:

bool isfile(const std::string & path) {     struct _stat stat;      if (_stat(path.c_str(), &stat))         return false;                   // call returns -1 errno enoent      return (stat.st_mode & _s_ifreg) != 0; } 

when debugging, have found _stat calls findfirstfile function:

    /* call find match file */     findhandle = findfirstfile((_tschar *)name, &findbuf);     if ( findhandle == invalid_handle_value ) {         _tschar * pbuf = null; 

... , fails find file here.

what problem? doing wrong? how can enhance detection of existence of file? (the code runs in environment drive mapping made local administrator, , cannot change configuration.)