Read/Write files with UNC path - in c++ - c++

Question

I wrote a bit of code that reads/writes stuff...
I would like to add an option to read/write to UNC paths.
A bit of code:
if (boost::filesystem::exists (file_name))
{
std::ifstream in_file(file_name.c_str(), std::ios::in|std::ios::binary|std::ios::ate);
if(in_file.is_open())
{
in_file.read(...);
in_file.close();
}
}
If the network share I am trying to use has been used before, this works.
But if I try with a share from a computer that I have not seen before, I get error:
boost::filesystem::status: Logon failure: unknown user name or bad password: "\\xx\test.txt"
I'd like to avoid the exception, check the boost::filesystem::status for... what ? Looking in documentation, it seems that it can tell me if I have a regular file, or a directory... but how can I check if I have the correct permissions ?
Is there a way to actually send in the user name and password ?
Edit: found that I could call
Net Use \\yourUNC\path /user:uname password
also:
http://msdn.microsoft.com/en-us/library/windows/desktop/aa375187(v=vs.85).aspx
I think either of these would make the code platform dependent ?
Also, if I do log in every time - in a sequence of 10000 calls, this would result in serious slowing down ?
Is there any way to check if the user is logged in ?
Note: I am using boost 1.47 - mostly windows but I'd like to be platform independent.
Thank you.

Answer 1

The only way I found that I can check rights was to try... catch surrounding a check for file exist call.
If the try fails, it means I don't have rights and can call system("Net Use...")
This way, I only have to log in once even if I read/write 10,000 files...
I don't like the fact that I have to use try... catch, if there is a better way, and I'll find it, I'll update - if anyone knows of a better way, please let me know.