Thread: gethostbyaddr

  1. #1
    Registered User canine's Avatar
    Join Date
    Sep 2001

    Question gethostbyaddr

    If anyone here has ever used the function gethostbyaddr or gethostbyname can you pleas tell me how to use them

  2. #2
    Normal vector Carlos's Avatar
    Join Date
    Sep 2001
    Here is a MFC snippet. I just made it in a hurry, to show you the usage of gethostbyname.
    The whole thing is in the OnOK event, as you see.
    The dialog contains a ListBox(multiline, control variable m_ListC, to display the data ) and an EditBox (control var m_EditV) to enter host name.

    void CGethostDlg::OnOK()
    // TODO: Add extra validation here
    hostent* aHostenPtr;
    CString aHostName;

    UpdateData( TRUE );
    if ( m_EditV.IsEmpty() ) // if no data entered, warn
    MessageBox( "Enter host name, please!","No host name entered", MB_OK );

    aHostName = m_EditV;
    const char* aHostNameChr = (LPCSTR)aHostName;

    aHostenPtr = gethostbyname( aHostNameChr );
    if ( !aHostenPtr )
    MessageBox( "gethostbyname failed!", "Warning", MB_OK );

    m_ListC.AddString( (LPCTSTR) aHostenPtr->h_aliases );
    m_ListC.AddString( (LPCTSTR) aHostenPtr->h_name );
    m_ListC.AddString( (LPCTSTR) aHostenPtr->h_addr_list[0] );

    UpdateData( FALSE );

    Whether with or without MFC, the function needs a hostent* as return type, and char* as param.

    That's all, hope this helps.

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