using select to poll cin

[timekeer9]

Hi,
I would like to poll stdin for input so I can get user input from the command line without blocking. Looking through the archives, it appears that the best way to do this is using a combination of select and cin.rdbuf()->in_avail(). However, I can't seem to get it to work properly. My select statement seems to always return true, and the cin.rdbuf()->in_avail() always returns false, regardless of if the user has typed or not. Here is the relevant code snippet, anyone have any thoughts? (I am using c++ in .net on a windows box if that helps.)

fd_set readfds;
FD_ZERO(&readfds);
FD_SET(fileno(stdin), &readfds);

struct timeval tv;
tv.tv_sec = 0;
tv.tv_usec = 0;
	

while(true)
{
    select(16, &readfds, 0, 0, &tv);
    //if something is available on cin, read in a char
    if(FD_ISSET( fileno(stdin), &readfds ) != 0)
    {
        //process all available input, once character at a time
        while(cin.rdbuf()->in_avail()>0)
        { 
            char c;
	    cin.get(c);
            processUserInput(c);
	}
}

Thanks!