Thread: gethostbyaddr

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 );
return;
}

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

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

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.