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Enumeration of Computer Names and their IP address

, 28 Jun 2002
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Retrieves the Computer names in a network and their corresponding IP addresses

Introduction

This code snippet allows you to retrieve the names of the computers in the network and their associated IP addresses. You can use this code to retrieve the host information in a network and also get the IP address of each pc. Its something similar to what you see in the Network Neighborhood list. All luck.

Things to do

  1. #include winsock2.h
  2. In the Menu, go to Project--Settings and in the Link tab, you can see a text box named Object/Library Modules. In that, add ws2_32.lib mpr.lib to the existing entries there. Those 2 libraries have to be added for this code snippet to compile without any linker errors.

Program listing

CString strTemp;
struct hostent *host;

struct in_addr *ptr; // To retrieve the IP Address 

DWORD dwScope = RESOURCE_CONTEXT;
NETRESOURCE *NetResource = NULL;
HANDLE hEnum;
WNetOpenEnum( dwScope, NULL, NULL, 
             NULL, &hEnum );

WSADATA wsaData;
WSAStartup(MAKEWORD(1,1),&wsaData);

if ( hEnum )
{
    DWORD Count = 0xFFFFFFFF;
    DWORD BufferSize = 2048;
    LPVOID Buffer = new char[2048];
    WNetEnumResource( hEnum, &Count, 
        Buffer, &BufferSize );
    NetResource = (NETRESOURCE*)Buffer;

    char szHostName[200];
    unsigned int i;

    for ( i = 0; 
        i < BufferSize/sizeof(NETRESOURCE); 
        i++, NetResource++ )
    {
        if ( NetResource->dwUsage == 
            RESOURCEUSAGE_CONTAINER && 
            NetResource->dwType == 
            RESOURCETYPE_ANY )
        {
            if ( NetResource->lpRemoteName )
            {
                CString strFullName = 
                    NetResource->lpRemoteName;
                if ( 0 == 
                    strFullName.Left(2).Compare("\\\\") )   
                    strFullName = 
                        strFullName.Right(
                            strFullName.GetLength()-2);

                gethostname( szHostName, 
                    strlen( szHostName ) );
                host = gethostbyname(strFullName);

                if(host == NULL) continue; 
                ptr = (struct in_addr *) 
                    host->h_addr_list[0];                    

                // Eg. 211.40.35.76 split up like this.             
                int a = ptr->S_un.S_un_b.s_b1;  // 211           
                int b = ptr->S_un.S_un_b.s_b2;  // 40
                int c = ptr->S_un.S_un_b.s_b3;  // 35
                int d = ptr->S_un.S_un_b.s_b4;  // 76

                strTemp.Format("%s -->  %d.%d.%d.%d",
                    strFullName,a,b,c,d);
                AfxMessageBox(strTemp);
            }
        }
    }

    delete Buffer;
    WNetCloseEnum( hEnum ); 
}

WSACleanup();

License

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About the Author

VGirish
Founder
India India
No Biography provided

Comments and Discussions

 
GeneralMy vote of 5 PinmemberPuneet Kumar Bhatia15-Mar-11 22:18 
Generalcomments PinmemberRiceking9-Mar-05 6:45 
Questionhow??? PinsussAnonymous28-Oct-04 10:34 
I'm a scripting Noob...What exactly do I need in order to get this to work?
 
I copied the above and pasted into a .vbs file and ran it, thus resulting in an error cause i dont know what i'm doing apprenetly :S
 
TIA,
 
VBS noob
AnswerRe: how??? Pinmember1of34-Mar-05 6:46 
AnswerRe: how??? PinmvpDavidCrow20-Mar-07 8:00 
GeneralGeting information Pinmemberone_eddie4-Aug-04 0:57 
GeneralCan't find all computer! PinsussAnonymous10-Feb-04 3:26 
GeneralRe: Can't find all computer! PinmemberChuggy8826-Sep-08 0:04 
Generalerror... Pinmemberfyh2119-Oct-03 22:28 
GeneralENUMERATING ALL DEVICES... Pinmemberborini30-Aug-03 23:52 
QuestionCan't get info on 'Workgroup' nodes? Pinmemberob63515-Apr-03 10:27 
Generalwsock vs wsock2 PinmemberNullStream29-Jun-02 1:37 
Generalvery nice althrough have some leaks Pinmembersidewalk29-Jun-02 1:25 
Generalmultithreading Pinmembermeteor19-Jun-02 19:15 
GeneralRe: multithreading PinsussPeter Hendrix23-Jul-02 3:41 
QuestionHow to get all the Subnet Mask.... PinmemberPhan Tien Vu3-Jun-02 1:26 
Questionhow to enum current login user PinmemberSuresh M28-Feb-02 19:41 
GeneralI Cant Browse the Computers' names PinmemberHrh24-Feb-02 3:34 
QuestionHow to hadle CString? PinmemberDMD1-Jul-01 1:44 
AnswerRe: How to hadle CString? PinmemberVGirish1-Jul-01 15:09 
GeneralMemory leak PinmemberAnonymous1-Jun-01 2:21 
GeneralTo Retrieve MAC Address PinmemberMaria Jothi28-May-01 3:10 
GeneralRe: To Retrieve MAC Address PinmemberVGirish5-Jun-01 18:05 
GeneralRe: To Retrieve MAC Address PinmemberAnonymous29-Aug-01 19:53 

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