检查Windows文件权限

Question

I'm trying to figure out how to check if a directory can be changed to without actually changing to the directory.

On a posix system I would do:

if (access("/some/path", X_OK) == 0) {
  // okay!
}

If only Windows was so simple ....

I've taken a look at the documentation or GetFileSecurity , but I can't seem to wrap my head around Windows ACLs and what I actually have to check for to ensure a directory can be changed to.

Answer 1

The only way to be sure if an operation will succeed is to actually try the operation.

However, SetCurrentDirectory will fail if you don't have FILE_TRAVERSE or SYNCHRONIZE permissions for the folder in question. So you can test this using CreateFile without actually changing the directory.

bool TestForSetCurrentDirPermission(LPCWSTR pszDir)
{
    HANDLE hDir = CreateFile(pszDir, FILE_TRAVERSE | SYNCHRONIZE,
        FILE_SHARE_READ | FILE_SHARE_WRITE, 0, OPEN_EXISTING,
        FILE_FLAG_BACKUP_SEMANTICS, NULL);

    if (hDir != INVALID_HANDLE_VALUE) CloseHandle(hDir);
    return hDir != INVALID_HANDLE_VALUE;
}