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Posted 12 Apr 2012

Enumeration of Computer Names and their IP address

, 12 Apr 2012
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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

This article has no explicit license attached to it but may contain usage terms in the article text or the download files themselves. If in doubt please contact the author via the discussion board below.

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About the Author

VGirish
Founder
India India
No Biography provided

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