void DIALOG_ERC::TestErc( wxArrayString* aMessagesList )
{
    wxFileName fn;

    if( !DiagErcTableInit )
    {
        memcpy( DiagErc, DefaultDiagErc, sizeof(DefaultDiagErc) );
        DiagErcTableInit = true;
    }

    m_writeErcFile = m_WriteResultOpt->GetValue();

    /* Build the whole sheet list in hierarchy (sheet, not screen) */
    SCH_SHEET_LIST sheets;
    sheets.AnnotatePowerSymbols();

    if( m_parent->CheckAnnotate( aMessagesList, false ) )
    {
        if( aMessagesList )
        {
            wxString msg = _( "Annotation required!" );
            msg += wxT( "\n" );
            aMessagesList->Add( msg );
        }

        return;
    }

    SCH_SCREENS screens;

    // Erase all previous DRC markers.
    screens.DeleteAllMarkers( MARK_ERC );

    for( SCH_SCREEN* screen = screens.GetFirst(); screen != NULL; screen = screens.GetNext() )
    {
        /* Ff wire list has changed, delete Undo Redo list to avoid pointers on deleted
         * data problems.
         */
        if( screen->SchematicCleanUp( NULL ) )
            screen->ClearUndoRedoList();
    }

    /* Test duplicate sheet names inside a given sheet, one cannot have sheets with
     * duplicate names (file names can be duplicated).
     */
    TestDuplicateSheetNames( true );

    NETLIST_OBJECT_LIST* objectsConnectedList = m_parent->BuildNetListBase();

    // Reset the connection type indicator
    objectsConnectedList->ResetConnectionsType();

    unsigned lastNet;
    unsigned nextNet = lastNet = 0;
    int NetNbItems = 0;
    int MinConn    = NOC;

    for( unsigned net = 0; net < objectsConnectedList->size(); net++ )
    {
        if( objectsConnectedList->GetItemNet( lastNet ) !=
            objectsConnectedList->GetItemNet( net ) )
        {
            // New net found:
            MinConn    = NOC;
            NetNbItems = 0;
            nextNet   = net;
        }

        switch( objectsConnectedList->GetItemType( net ) )
        {
        // These items do not create erc problems
        case NET_ITEM_UNSPECIFIED:
        case NET_SEGMENT:
        case NET_BUS:
        case NET_JUNCTION:
        case NET_LABEL:
        case NET_BUSLABELMEMBER:
        case NET_PINLABEL:
        case NET_GLOBLABEL:
        case NET_GLOBBUSLABELMEMBER:
            break;

        case NET_HIERLABEL:
        case NET_HIERBUSLABELMEMBER:
        case NET_SHEETLABEL:
        case NET_SHEETBUSLABELMEMBER:

            // ERC problems when pin sheets do not match hierarchical labels.
            // Each pin sheet must match a hierarchical label
            // Each hierarchical label must match a pin sheet
            TestLabel( objectsConnectedList, net, nextNet );
            break;

        case NET_NOCONNECT:

            // ERC problems when a noconnect symbol is connected to more than one pin.
            MinConn = NET_NC;

            if( NetNbItems != 0 )
                Diagnose( objectsConnectedList->GetItem( net ), NULL, MinConn, UNC );

            break;

        case NET_PIN:

            // Look for ERC problems between pins:
            TestOthersItems( objectsConnectedList, net, nextNet, &NetNbItems, &MinConn );
            break;
        }

        lastNet = net;
    }

    // Displays global results:
    wxString num;
    int markers = screens.GetMarkerCount();
    int warnings = screens.GetMarkerCount( WAR );

    num.Printf( wxT( "%d" ), markers );
    m_TotalErrCount->SetLabel( num );

    num.Printf( wxT( "%d" ), markers - warnings );
    m_LastErrCount->SetLabel( num );

    num.Printf( wxT( "%d" ), warnings );
    m_LastWarningCount->SetLabel( num );

    // Display diags:
    DisplayERC_MarkersList();

    // Display new markers:
    m_parent->GetCanvas()->Refresh();

    if( m_writeErcFile )
    {
        fn = g_RootSheet->GetScreen()->GetFileName();
        fn.SetExt( wxT( "erc" ) );

        wxFileDialog dlg( this, _( "ERC File" ), fn.GetPath(), fn.GetFullName(),
                          _( "Electronic rule check file (.erc)|*.erc" ),
                          wxFD_SAVE | wxFD_OVERWRITE_PROMPT );

        if( dlg.ShowModal() == wxID_CANCEL )
            return;

        if( WriteDiagnosticERC( dlg.GetPath() ) )
        {
            Close( true );
            ExecuteFile( this, wxGetApp().GetEditorName(), QuoteFullPath( fn ) );
        }
    }
}