DELPHI - How check if OLE library is installed on client

When you use some special OLE object, you can check, if is installed on client (Winapi.ActiveX):

var
  classID: TCLSID;
  sOLEObject: string;
  bIsSupport : boolean;
begin
  { is installed ? }

  sOLEObject := 'Microsoft.DirectMusic.1';
  bIsSupport := CLSIDFromProgID( PWideChar( WideString( sOLEObject ) ), classID ) = S_OK;

  if bIsSupport then ShowMessage( 'Supported.' );
  ...

AX - How to work with advanced filters (..with sql where condition)

When you need some special filters, especially in relation to another field(s) from table, you can write directly sql where code.

This example shows all production orders, where difference between Delivery date and End date is 10 days:

SQL SERVER - How and why use "N" prefix for unicode strings

N prefix before string takes string as unicode (without N is string converted to DB codepage). It is useful for some special chars in some alphabets.

select 'Počty vzrůstajících kusů' as description
union all
select N'Počty vzrůstajících kusů'

Output:

description
------------------------
Pocty vzrustajících kusu
Počty vzrůstajících kusů

(2 row(s) affected)

DELPHI - How to create new directory (..and check if directory exists)

var
  sBackupPath : string;
begin
  ...
  sBackupPath := gsExePath + gcsDictionarySubDir;

  { check if not exists }
  if not DirectoryExists( sBackupPath ) then
    begin
      { try to create new directory }

      b := ForceDirectories( sBackupPath );

      if not b then
        begin
          ShowMessage( 'Backup directory cannot be created.' );
          exit;
        end;
    end;
...

DELPHI - How to make tray icon with WIN API support only (without TTrayIcon)

trayIconData : TNotifyIconData;
...
{ add icon }
with TrayIconData do
begin
  cbSize := sizeOf( trayIconData );
  Wnd := Handle;
  uID := 0;
  uFlags := NIF_MESSAGE + NIF_ICON + NIF_TIP;
  uCallbackMessage := WM_ICONTRAY;
  hIcon := Application.Icon.Handle;
  StrPCopy( szTip, self.Caption );
end;

Shell_NotifyIcon( NIM_ADD, @TrayIconData );

And callback procedure:

procedure TFMain.WMIconTray( var msg : TMessage );
var
  pt : TPoint;
begin
  case msg.lParam of
    { popup menu }
    WM_RBUTTONDOWN:
      begin
         GetCursorPos( pt );
         PopupTray.Popup( pt.x, pt.y );
      end;

    { doubleclick }
    WM_LBUTTONDBLCLK :
      begin
        MPopup_NextClick( nil );
      end;

    { mouse over }
    WM_MOUSEMOVE :
      begin
        self.Caption := gcsTitle + GetNextWordTime;

        with TrayIconData do
        begin
          StrPCopy( szTip, self.Caption );
          uFlags := NIF_TIP;
          Shell_NotifyIcon( NIM_MODIFY, @TrayIconData );
        end;
        
      end;
   end;
end;

And removing after destroy:

procedure TFMain.FormDestroy(Sender: TObject);
begin
  ...
  Shell_NotifyIcon( NIM_DELETE, @trayIconData );
end;

Output:

AX - How to round values

Second parameter from round() function define how will be rounded.

real iValue = 15.5678532;
real iResult1, iResult2;
    
// round to 0.1
iResult1 = round( iValue, 0.1 );
// round to all number */
iResult2 = round( iValue, 1 );
        
info( num2str( iResult1, 15, 2, 1, 0 ) + " - " + num2str( iResult2, 15, 2, 1, 0 ) );

Output:

15.60 - 16.00

DELPHI - How to make rotation of shape around point

Suppose this easy class for shape - triangle:

TShape = class( TObject )
  p1 : TPoint;
  p2 : TPoint;
  p3 : TPoint;

  procedure Moving( _iDeltaX, _iDeltaY : integer );
  procedure Rotation( _iAngle : integer );
  procedure RotationAroundXY( _x, _y : integer; _iAngle : integer );
end;

And initialization:

pShape := TShape.Create;
pShape.p1.X := 300;  pShape.p1.Y := 250;
pShape.p2.X := 250;  pShape.p2.Y := 280;
pShape.p3.X := 350;  pShape.p3.Y := 330;

For rotation shape around point use this code:

procedure TShape.RotationAroundXY( _x, _y : integer; _iAngle : integer );
var
  iNewX, iNewY : integer;
  dCos, dSin : double;
  dRadian : double;
  p1x, p1y, p2x, p2y, p3x, p3y : integer;
begin
  { -- angle }

  dRadian := ( 2 * pi ) / ( 360 / _iAngle );
                     
  dCos := cos( dRadian );
  dSin := sin( dRadian );

  { -- point for rotation around (in other case the rotation is around start of coords) }

  p1x := p1.x - _x;
  p1y := p1.y - _y;
  p2x := p2.x - _x;
  p2y := p2.y - _y;
  p3x := p3.x - _x;
  p3y := p3.y - _y;

  { -- calculation of the positions }

  iNewX := round( ( p1x * dCos ) - ( p1y * dSin ) );
  iNewY := round( ( p1y * dCos ) + ( p1x * dSin ) );
  p1.X := iNewX + _x;
  p1.Y := iNewY + _y;

  iNewX := round( ( p2x * dCos ) - ( p2y * dSin ) );
  iNewY := round( ( p2y * dCos ) + ( p2x * dSin ) );
  p2.X := iNewX + _x;
  p2.Y := iNewY + _y;

  iNewX := round( ( p3x * dCos ) - ( p3y * dSin ) );
  iNewY := round( ( p3y * dCos ) + ( p3x * dSin ) );
  p3.X := iNewX + _x;
  p3.Y := iNewY + _y;
end;

Output:

JAVA, JAVAFX - listener and lambda expression

Since JDK 1.8 you can use lambda expression. This article compares old and new variants on one example with CheckBox listener.

Old variant (response for change in CheckBox):

@FXML CheckBox checkbox1;
@FXML Label label1;

@Override
public void initialize( URL url, ResourceBundle rb ) {               

  /* variant without lambda expression */
    
  checkbox1.selectedProperty().addListener( new ChangeListener< boolean >() {
    @Override
    public void changed( ObservableValue observable, Boolean oldValue, Boolean newValue ) {
      label1.setText( newValue.toString() );
    }
  } );        
        
  /* -- init */
    
  checkbox1.selectedProperty().set( true );    
}  

And new (optional - old variant is still working) with lambda expression:

@FXML CheckBox checkbox1;
@FXML Label label1;
  
@Override
public void initialize( URL url, ResourceBundle rb ) {               
   
  /* variant with lambda expression */
    
  checkbox1.selectedProperty().addListener(
    ( ObservableValue observable, Boolean oldValue, Boolean newValue ) -> {
      label1.setText( newValue.toString() );
      }
    );    
    
  /* -- init */
    
  checkbox1.selectedProperty().set( true );    
}  

Both variant have same result:

SSRS - How disable fitting chart axis (..to more columns)

Sometimes SSRS chart left axis is fitted to more columns.

For solving that, set left axis property LabelsAutoFitDisabled to true.

SQL SERVER - How get database instance version

print @@version

Output:

Microsoft SQL Server 2014 (SP2-GDR) (KB4019093) - 12.0.5207.0 (X64) 
 Jul  3 2017 02:25:44 
 Copyright (c) Microsoft Corporation
 Express Edition (64-bit) on Windows NT 6.3  (Build 9600: ) (Hypervisor)