Raw Input Device informations

I was working with a small project where we had the task to identify raw input devices attached to the system. We also needed to retrieve the attached raw input device informations in detail. I found few online articles and APIs on MSDN which proved to be very useful in completing the task assigned to me.

In this article I am going to explain and demonstrate the usage of these RAW Input APIs. As a additional reference I strongly recommend the MSDN article( RAW INPUT ). In the example chosen, I have used two Win32 APIs to enumerate the attached raw input devices, each device name and device informations. The following section describes two Win32 APIs briefly.

UINT GetRawInputDeviceList( PRAWINPUTDEVICELIST pRawInputDeviceList,
                            PUINT puiNumDevices,
                            UINT cbSize);

This function is used for enumeration of raw input devices. For full description please follow MSDN article ( GetRawInputDeviceList ).

UINT GetRawInputDeviceInfo( HANDLE hDevice,
                            UINT uiCommand,
                            LPVOID pData,
                            PUINT pcbSize);

To get detailed information about the attached devices, use the  GetRawInputDeviceInfo function. The following demo code snippet is the implemenation details to get attached raw input devices name and information:

// HIDDeviceCheck.cpp : Defines the entry point for the console application.
//

#include "stdafx.h"
#include "HIDDeviceCheck.h"

#ifdef _DEBUG
#define new DEBUG_NEW
#endif


// The one and only application object

CWinApp theApp;

using namespace std;

int _tmain(int argc, TCHAR* argv[], TCHAR* envp[])
{
   int nRetCode = 0;

   // initialize MFC and print and error on failure
   if (!AfxWinInit(::GetModuleHandle(NULL), NULL, ::GetCommandLine(), 0))
   {
      // TODO: change error code to suit your needs
      _tprintf(_T("Fatal Error: MFC initialization failed\n"));
      nRetCode = 1;
   }
   else
   {
      // TODO: code your application's behavior here.


      UINT nDevices;
      PRAWINPUTDEVICELIST pRawInputDeviceList;
      if (GetRawInputDeviceList(NULL, &nDevices, sizeof(RAWINPUTDEVICELIST)) != 0) 
      {
         cout << "Errors..." << endl;
         return 1;
      }

      if ((pRawInputDeviceList = (PRAWINPUTDEVICELIST)malloc(sizeof(RAWINPUTDEVICELIST) * nDevices)) == NULL) 
      {
         cout << "Initialization failed..." << endl;
         return 1;
      }

      int nNoOfDevices = 0;
      if ((nNoOfDevices = GetRawInputDeviceList(pRawInputDeviceList, &nDevices, sizeof(RAWINPUTDEVICELIST))) == ((UINT) - 1)) 
      {
         // Error
         return 1;
      }

      RID_DEVICE_INFO rdi;
      rdi.cbSize = sizeof(RID_DEVICE_INFO);

      for(int i = 0; i < nNoOfDevices; i++)
      {
         UINT size = 256;
         TCHAR tBuffer[256] = {0};
         
         if(GetRawInputDeviceInfo(pRawInputDeviceList[i].hDevice, RIDI_DEVICENAME, tBuffer, &size) < 0)
         {
            // Error in reading device name
         }

         // cout << "Device Name: " << tBuffer << endl;
         _tprintf(L"Device Name: %s\n", tBuffer);

         UINT cbSize = rdi.cbSize;
         if(GetRawInputDeviceInfo(pRawInputDeviceList[i].hDevice, RIDI_DEVICEINFO, &rdi, &cbSize) < 0)
         {
            // Error in reading information
         }

         if(rdi.dwType == RIM_TYPEMOUSE)
         {
            cout << "ID for Mouse:" << rdi.mouse.dwId << endl;
            cout << "Number of Buttons:" << rdi.mouse.dwNumberOfButtons << endl;
            cout << "Sample rate(Number of data points):" << rdi.mouse.dwSampleRate << endl;
            cout << "**************************" << endl;
         }

         if(rdi.dwType == RIM_TYPEKEYBOARD)
         {
            cout << "Keyboard Mode:" << rdi.keyboard.dwKeyboardMode << endl;
            cout << "Number of function keys:" << rdi.keyboard.dwNumberOfFunctionKeys << endl;
            cout << "Number of indicators:" << rdi.keyboard.dwNumberOfIndicators << endl;
            cout << "Number of keys total: " << rdi.keyboard.dwNumberOfKeysTotal << endl;
            cout << "Type of the keyboard: " << rdi.keyboard.dwType << endl;
            cout << "Subtype of the keyboard: " << rdi.keyboard.dwSubType << endl;
            cout << "***********************" << endl;
         }

         if(rdi.dwType == RIM_TYPEHID)
         {
            cout << "Vendor Id:" << rdi.hid.dwVendorId << endl;
            cout << "Product Id:" << rdi.hid.dwProductId << endl;
            cout << "Version No:" << rdi.hid.dwVersionNumber << endl;
            cout << "Usage for the device: " << rdi.hid.usUsage << endl;
            cout << "Usage Page for the device: " << rdi.hid.usUsagePage << endl;
            cout << "***********************" << endl;
         }
      }

      free(pRawInputDeviceList);
   }

   return nRetCode;
}

The snap shot of the output looks like the picture below:



About the Author

Mufti Mohammed

Small-Talk and Small-Programming working together. My Blog

Comments

  • Doubt on duplicate info

    Posted by RAMESH on 05/26/2015 11:48pm

    Could you please tell me why it showing 2 mouse and 2 key board info

    Reply
  • Minimum Requirements

    Posted by Brad Jones on 03/17/2009 11:19am

    Comment from a Codeguru reviewer: The minimum operating systems requirement for "Raw Inputs" is Windows XP

    Reply
Leave a Comment
  • Your email address will not be published. All fields are required.

Top White Papers and Webcasts

  • When individual departments procure cloud service for their own use, they usually don't consider the hazardous organization-wide implications. Read this paper to learn best practices for setting up an internal, IT-based cloud brokerage function that service the entire organization. Find out how this approach enables you to retain top-down visibility and control of network security and manage the impact of cloud traffic on your WAN.

  • U.S. companies are desperately trying to recruit and hire skilled software engineers and developers, but there is simply not enough quality talent to go around. Tiempo Development is a nearshore software development company. Our headquarters are in AZ, but we are a pioneer and leader in outsourcing to Mexico, based on our three software development centers there. We have a proven process and we are experts at providing our customers with powerful solutions. We transform ideas into reality.

Most Popular Programming Stories

More for Developers

RSS Feeds

Thanks for your registration, follow us on our social networks to keep up-to-date