Detecting which keyboard used

Question

I am trying to determine which keyboard a key was pressed on in C++. For example, if I press the 'a' key on one keyboard, it prints 1 and if the 'a' key was pressed on a different keyboard then it prints 2. I really only need it for Windows.

Also, I only want to use standard libraries. I have used GetInputDeviceInfo/list to get all keyboards, however, I am unsure how to continue from here. I have tried looking online which has got me so far but I can not find anything to help with getting the current input device in order to compare it to the list.

If it is just not possible with Windows to do this, is there any other way to differentiate between the keyboards?

Any help would be appreciated. This is my first question on here so I apologise if I have not given enough detail, I will try to add more if asked. I'll also add the relevant code soon, it's messy so I need to clean it up before I post it.

Edit

Here it is:

int find_devices()
{

    vector <int> keyboard_index;



       // Get Number Of Devices
    UINT nDevices = 0;
    GetRawInputDeviceList(NULL, &nDevices, sizeof(RAWINPUTDEVICELIST));

    // Got Any?
    if (nDevices < 1)
    {
        // Exit
        cout << "ERR: 0 Devices?";
        cin.get();
        return 0;
    }

    // Allocate Memory For Device List
    PRAWINPUTDEVICELIST pRawInputDeviceList;
    pRawInputDeviceList = new RAWINPUTDEVICELIST[sizeof(RAWINPUTDEVICELIST) * nDevices];

    // Got Memory?
    if (pRawInputDeviceList == NULL)
    {
        // Error
        cout << "ERR: Could not allocate memory for Device List.";
        cin.get();
        return 0;
    }

    // Fill Device List Buffer
    int nResult;
    nResult = GetRawInputDeviceList(pRawInputDeviceList, &nDevices, sizeof(RAWINPUTDEVICELIST));

    // Got Device List?
    if (nResult < 0)
    {
        // Clean Up
        delete[] pRawInputDeviceList;

        // Error
        cout << "ERR: Could not get device list.";
        cin.get();
        return 0;
    }

    // Loop Through Device List
    for (UINT i = 0; i < nDevices; i++)
    {
        // Get Character Count For Device Name
        UINT nBufferSize = 0;
        nResult = GetRawInputDeviceInfo(pRawInputDeviceList[i].hDevice, // Device
            RIDI_DEVICENAME,                // Get Device Name
            NULL,                           // NO Buff, Want Count!
            &nBufferSize);                 // Char Count Here!

                                           // Got Device Name?
        if (nResult < 0)
        {
            // Error
            cout << "ERR: Unable to get Device Name character count.. Moving to next device." << endl << endl;

            // Next
            continue;
        }

        // Allocate Memory For Device Name
        WCHAR* wcDeviceName = new WCHAR[nBufferSize + 1];

        // Got Memory
        if (wcDeviceName == NULL)
        {
            // Error
            cout << "ERR: Unable to allocate memory for Device Name.. Moving to next device." << endl << endl;

            // Next
            continue;
        }

        // Get Name
        nResult = GetRawInputDeviceInfo(pRawInputDeviceList[i].hDevice, // Device
            RIDI_DEVICENAME,                // Get Device Name
            wcDeviceName,                   // Get Name!
            &nBufferSize);                 // Char Count

                                           // Got Device Name?
        if (nResult < 0)
        {
            // Error
            cout << "ERR: Unable to get Device Name.. Moving to next device." << endl << endl;

            // Clean Up
            delete[] wcDeviceName;

            // Next
            continue;
        }

        // Set Device Info & Buffer Size
        RID_DEVICE_INFO rdiDeviceInfo;
        rdiDeviceInfo.cbSize = sizeof(RID_DEVICE_INFO);
        nBufferSize = rdiDeviceInfo.cbSize;

        // Get Device Info
        nResult = GetRawInputDeviceInfo(pRawInputDeviceList[i].hDevice,
            RIDI_DEVICEINFO,
            &rdiDeviceInfo,
            &nBufferSize);

        // Got All Buffer?
        if (nResult < 0)
        {
            // Error
            cout << "ERR: Unable to read Device Info.. Moving to next device." << endl << endl;

            // Next
            continue;
        }



        // Keyboard
        else if (rdiDeviceInfo.dwType == RIM_TYPEKEYBOARD)
        {
            // Current Device
            cout << endl << "Displaying device " << i + 1 << " information. (KEYBOARD)" << endl;
            wcout << L"Device Name: " << wcDeviceName << endl;
            cout << "Keyboard mode: " << rdiDeviceInfo.keyboard.dwKeyboardMode << endl;
            cout << "Number of function keys: " << rdiDeviceInfo.keyboard.dwNumberOfFunctionKeys << endl;
            cout << "Number of indicators: " << rdiDeviceInfo.keyboard.dwNumberOfIndicators << endl;
            cout << "Number of keys total: " << rdiDeviceInfo.keyboard.dwNumberOfKeysTotal << endl;
            cout << "Type of the keyboard: " << rdiDeviceInfo.keyboard.dwType << endl;
            cout << "Subtype of the keyboard: " << rdiDeviceInfo.keyboard.dwSubType << endl;

            keyboard_index.push_back(i);
        }


        // Delete Name Memory!
        delete[] wcDeviceName;
    }

    // Clean Up - Free Memory
    //delete[] pRawInputDeviceList;

    // Exit


    for(int t = 0; t < abs(keyboard_index.size()); t++)
    {

        cout << keyboard_index[t] << endl << pRawInputDeviceList[keyboard_index[t]].hDevice;

    }




for(int r = 0; r == 0;)
{
    if(GetKeyState('A') & 0x8000/*Check if high-order bit is set (1 << 15)*/)
    {
            // Do stuff

    }

    else if(GetKeyState('B') & 0x8000/*Check if high-order bit is set (1 << 15)*/)
    {
            // Do stuff

        cout << "b\n";

        r = 1;


    }


return 1;

}

Edit

I've changed up the code so it uses WM_INPUT instead. It is still using all the keyboards however:

void InitRawInput(HWND hWnd)
{

    RAWINPUTDEVICE Rid[1];
    Rid[0].usUsagePage = 0x01;
    Rid[0].usUsage = 0x06;
    Rid[0].dwFlags = RIDEV_INPUTSINK;
    Rid[0].hwndTarget = hWnd;
    if (RegisterRawInputDevices(Rid,1,sizeof(Rid[0])) == false)
        {
        cout << "Registration failed" << endl;
        return;
        }
    cout << "Registration updated" << endl;
}