Keyboard, Mouse Status

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4.00/5 (1 vote)

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I want to check that whether the mouse/Keyboard is connected to PC or not.

I have tried by using user32.dll . Its showing me the cursor position only.

Also I have tried with the Win32_keyboard class, I am getting the status as " OK ". But when I disconnect the Keyboard from PC. Still it shows the "OK" status. It should give me the Error status. But its not happening here.

Any other solution for solving this problem. Plz Help !!

Thanks in Advance ..

Posted 2-May-12 23:54pm

yoyogesh

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Comments

hjgc2001 12-Nov-13 20:19pm

I meet the problem same. How you solve this problem lastly?Thanks

3 solutions

Solution 1

Have a look at:
http://msdn.microsoft.com/en-us/library/windows/hardware/ff542441%28v=vs.85%29.aspx[^]
...cannot determine, if the device is later physically removed.

Posted 3-May-12 1:25am

trotwa

Updated 3-May-12 3:11am

v2

Solution 3

Agree to Jochen Arndt and trotwa solutions, in addition I also don't think PS/2 is working because this interface isn't designed for Hot plugging Devices (even if it works sometimes), as Jochen also said.

But there's a simple solution to detect it (if it's connected to PS/2 when booting your system) through WMI's SELECT * FROM Win32_Keyboard query and Status Property.

C#

using System;
using System.Management;
using System.Windows.Forms;

namespace WMISample
{
    public class MyWMIQuery
    {
        public static void Main()
        {
            try
            {
                ManagementObjectSearcher searcher =
                    new ManagementObjectSearcher("root\\CIMV2",
                    "SELECT * FROM Win32_Keyboard");

                foreach (ManagementObject queryObj in searcher.Get())
                {
                    Console.WriteLine("-----------------------------------");
                    Console.WriteLine("Win32_Keyboard instance");
                    Console.WriteLine("-----------------------------------");
                    Console.WriteLine("Status: {0}", queryObj["Status"]);
                }
            }
            catch (ManagementException e)
            {
                MessageBox.Show("An error occurred while querying for WMI data: " + e.Message);
            }
        }
    }
}

Regards

Posted 3-May-12 7:00am

El_Codero

Comments

hjgc2001 12-Nov-13 9:35am

I hvae used WMI to retrieve the staus of keyboard, but the method cann't work correctly. When I removed these devices, the program shows OK also.

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Jochen Arndt · Accepted Answer · 2012-05-03T01:26:00

You may use the SetupDiGetClassDevsEx [^] Setup API function to retrieve information on keyboards and mouses (you may connect more than one of each).

To detect arrival or removal of devices (including mouse and keyboard), you can add a WM_DEVICECHANGE [^] handler to your app.

[UPDATE: Example code]

When using MFC, add the WM_DEVICECHANGE handler to your main frame class (or the main dialog with dialog apps). With Win32 apps, handle the message in the message loop of your main window/app. The wParam is the event type and the lParam is the data pointer.

C++

#include <dbt.h>

// Declaration in header file of main frame class.
// afx_msg BOOL CMainFrame::OnDeviceChange(UINT nEventType, DWORD_PTR dwData);

// Message map entry
ON_WM_DEVICECHANGE()

// Implementation
int CMainFrame::OnCreate(LPCREATESTRUCT lpCreateStruct)
{
    if (CMDIFrameWnd::OnCreate(lpCreateStruct) == -1)
        return -1;
    
    // other init code here
    
    DEV_BROADCAST_DEVICEINTERFACE Notify;
    ::ZeroMemory(&Notify, sizeof(DEV_BROADCAST_DEVICEINTERFACE));
    Notify.dbcc_size = sizeof(DEV_BROADCAST_DEVICEINTERFACE);
    Notify.dbcc_devicetype = DBT_DEVTYP_DEVICEINTERFACE;
    const GUID GUID_DEVINTERFACE_HDI =
        { 0x4d1e55b2, 0xf16f, 0x11cf, { 0x88, 0xcb, 0x00, 0x11, 0x11, 0x00, 0x00, 0x30}};
    Notify.dbcc_classguid = GUID_DEVINTERFACE_HDI;
    ASSERT(this->GetSafeHwnd());
    HDEVNOTIFY hDevNotify = ::RegisterDeviceNotification(
        this->GetSafeHwnd(),
        &Notify, 
        DEVICE_NOTIFY_WINDOW_HANDLE);
    ASSERT(HDEVNOTIFY);
    	
    return 0;
}

BOOL CMainFrame::OnDeviceChange(UINT nEventType, DWORD_PTR dwData)
{
    // Call base class handler (base class name may need adjustment)
    BOOL nResult = CMDIFrameWnd::OnDeviceChange(nEventType, dwData);
    // Process events here. 
    // Arrival and removal send a DEV_BROADCAST_HDR.
    if (nEventType == DBT_DEVICEARRIVAL || nEventType == DBT_DEVICEREMOVECOMPLETE)
    {
        TRACE1("WM_DEVICECHANGE event %#X\n", nEventType);
        PDEV_BROADCAST_HDR pHdr = reinterpret_cast<PDEV_BROADCAST_HDR>(dwData);
        if (pHdr->dbch_devicetype == DBT_DEVTYP_DEVICEINTERFACE)
        {
            // Interface data
            PDEV_BROADCAST_DEVICEINTERFACE pDev = 
                reinterpret_cast<PDEV_BROADCAST_DEVICEINTERFACE>(dwData);
            TRACE2("%s %s\n", 
                nEventType == DBT_DEVICEARRIVAL ? "Arrival of" : "Removed", 
                pDev->dbcc_name);
            TCHAR lpszBuf[256];
            if (::StringFromGUID2(pDev->dbcc_classguid, lpszBuf, 256))
                TRACE1("GUID: %s\n", lpszBuf);
        }
    }
    return nResult;
}

Example output when removing and inserting USB mouse:

WM_DEVICECHANGE event 0X8004
Removed \\?\HID#VID_046D&PID_C018#6&1e99df8d&0&0000#{4d1e55b2-f16f-11cf-88cb-001111000030}
GUID: {4D1E55B2-F16F-11CF-88CB-001111000030}
WM_DEVICECHANGE event 0X8000
Arrival of \\?\HID#VID_046D&PID_C018#6&1e99df8d&0&0000#{4d1e55b2-f16f-11cf-88cb-001111000030}
GUID: {4D1E55B2-F16F-11CF-88CB-001111000030}