C#

Kevin Marois wrote:

First, how can my windows app know when a specifc tablet is plugged in and/or unplugged? I can give the tablets names or Id's if needed.

I guess I could handle some windows function and examine the devices name/Id.

Kevin Marois wrote:

Second, what's involved in getting the data off the tablet? Can the Windows app get files from a specific folder off the tablet? Windows would probably see it as just another drive. The question of access rights comes to mind.

I've never done tablet/PC interaction before.

Bastard Programmer from Hell
If you can't read my code, try converting it here[^]
"If you just follow the bacon Eddy, wherever it leads you, then you won't have to think about politics." -- Some Bell.

Environment.SetEnvironmentVariable(name, value, EnvironmentVariableTarget.User)

Environment.GetEnvironmentVariable("MYID", EnvironmentVariableTarget.User)

Reference Source[^]:

C#

// send a WM_SETTINGCHANGE message to all windows
IntPtr r = Win32Native.SendMessageTimeout(new IntPtr(Win32Native.HWND_BROADCAST), Win32Native.WM_SETTINGCHANGE, IntPtr.Zero, "Environment", 0, 1000, IntPtr.Zero);
if (r == IntPtr.Zero) BCLDebug.Assert(false, "SetEnvironmentVariable failed: " + Marshal.GetLastWin32Error());

Environment.SetEnvironmentVariable Method (System) | Microsoft Docs[^]:

If target is EnvironmentVariableTarget.User, the environment variable is stored in the HKEY_CURRENT_USER\Environment key of the local computer's registry. It is also copied to instances of File Explorer that are running as the current user. The environment variable is then inherited by any new processes that the user launches from File Explorer.
...
If target is User or Machine, other applications are notified of the set operation by a Windows WM_SETTINGCHANGE message.

string s = @"d1.8xlarge: 3 d1.xlarge: 0 c2.xlarge: 25
s1.medium: 1 c2.xlarge: 10 s1.large: 4 d1.8xlarge: 27";

string[] split = s.Split(new char[] {' ',':', '\r','\n'}, StringSplitOptions.RemoveEmptyEntries);

int limit = split.Length - 1;

var sorted = split.Select((string str, int ndx) => // declaration of auto-index
{
    int val;  // use of variable defined inside 'Select

    if (ndx < limit && int.TryParse(split[ndx + 1], out val))
    {
        return new {name = split[ndx], value = val};
    }
    else
    {
        return null; // you have to return something !
    }
})
.Where(itm => itm != null) // get rid of 'nulls
.GroupBy(itm => itm.name) // group on the 'name
.ToDictionary(grp => grp.Key, grp => grp.Sum(v => v.value)); // summation