Equivalent to C Defines / sparse enums
Hi,
I'm looking for a way to implement defines / sparse enums in Labview easily. For example if I use Labview to communicate with a device that has a set of commands, I want to define the possible commands in a central location and if new commands are added or the numbers change or whatever, I want this to be propagated to all places where it is used.
I already searched in the forums a little but didn't find a satisfying solution.
An enum doesn't really do the job if the values are not sequential. One way I could do it is by using a case structure or an array additionally but this means always keeping two places up-to-date. A text ring would be the better solution (though I still miss the possibility to map different names to the same value, which I need in some cases) but the big letdown is that constants of a text ring strict typedef are not updated so it is useless for what I want.
Actually I just want something like
typedef enum
FOO = 0,
BAR = 0,
FOOBAR = 10
} foobar;
or
#define FOO 0
#define BAR 0
#define FOOBAR 10
which is standard in C but seems unnecessary complicated and not straight-forward in LabView. Is there an elegant and easy solution? If not, are the LabView developers aware of this shortcoming and will it be implemented in future releases?
Thanks,
Tobias
Hi, Tobias,
There are many different ways how to implement this, depends from your needs and architecture.
In some cases just Globals may be useful (they are not always bad).
You can also create SubVIs like containers for your #defines, or using universal Functional Global VI, where these values will be stored - this is most flexible way. See examples:
Andrey.
Attachments:
Defines.zip 30 KB
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GlenLitch09 wrote:
I am sorry if my lingo is not up to speed, I have no formal programming training!
Neither have I, and that's never stopped me... (My "formal training" is as an electrical engineer! )
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Looking for an alternative to an enum (or any non trivial type)
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the previous sentence is something like assigning null to a pointer. NaN is not a valid value, so I can not operate with a var that has nan as a value.
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//#ifndef _nan
//#define _nan
//#define NaN "NaN"
//#endif
not the one I chose because it does not seem better than my second choice (that's why it appears as a comment), or does not solve the problem I have with the choices I have thought so far:
(in file 'especiales.h')
#ifndef _especiales
#define _especiales
enum EEspecial {NaN};
#endif
and in the file for the point definition (as inline functions)
void setX(double _x) {
x = _x;
defX = true;
void setX(EEspecial _e) {
if (_e == NaN)
defX = false;
else
throw coordIndefException();
double getX();
bool definidoX() {return defX;}
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geometriaPunto _ensayo;
try {
_ensayo.setX(NaN);
cout << _ensayo.getX() << "\n";
} catch (exception _e) {
cout << _e.what() << "\n";
this works fine. if I place a 0 in setX, it will print 0. if I place a NaN in the parenthesis, it will write the exception name. This works fine. But as far as I know, all basic var types, and all enums, also have implicit conversions to numeric values.
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tnxthis is the last post I will make on this thread, as I find your answers useless and I already have what I need, but concerning your answers:
"You said it worked for you in your 'adobe actionscript' code - why wouldn't the same technique work in C++ code? Number.NaN is a Number value, and it doesn't prevent you from doing operations in a var that holds that value - but that didn't
seem to concern you before."
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it will not have null anymore, if the compiler or the executable don't verify this behavior that should throw an exception. In actionscript, if a var has nan and I add something to it, it will still have nan, because nan is not a value, is a state, and probably
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could I define a single method, e.g. getNeuronError() which would behave differently dependent upon the type of neuron that is defined by the enum?Well I suppose that kind of depends on what you mean by "behave differently"... How differently? Could all varieties of Neuron be shoehorned into fulfilling ONE generalised interface contract... Hmmm... maybe not huh.
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Enum type is retrieving me a null reference
Hi, i have a very strange bug in my code that is messing me up.
I defined two enum types in separated files like this:
public enum Section {
SectionA, SectionN;
public enum Subsection {
SubA(1, SectionA), SubN(2, SectionN);
private Section sec;
private int num;
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}Well, the problem is that in the line with the comment I'm recieving a null reference and I think that is not possible. Is that a compiler bug?I'm no getting any error message, let me show you my code:
The problematic enum type.
public enum Subseccion {
ALUMNOS_ALTA(1, AltaAlumnos.class, "Alta", Privilegio.ALTA_ALUMNOS, Seccion.ALUMNOS),
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PERSONAL_ALTA(1, AltaPersonal.class, "Alta", Privilegio.ALTA_PROFESORES, Seccion.PERSONAL),
PERSONAL_BUSCAR(2, BuscarPersonal.class, "Buscar", Privilegio.PERSONAL_BUSCAR, Seccion.PERSONAL),
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GRUPOS(3, Grupos.class, "Grupos", Privilegio.GRUPOS, Seccion.CURSOS),
ASIGNAR_GRUPOS(4, AlumnosSalones.class, "Asignar Grupos", Privilegio.ASIGNAR_GRUPOS, Seccion.CURSOS);
private final Class<? extends JPanel> panel;
private final String texto;
private final Seccion pa; // La secci�n a la que pertenece
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this.panel = panel;
this.texto = texto;
if (fad == null)
System.err.println("A NULL REFERENCE"); // Always happen
pa = fad;
this.priv = priv;
this.importancia = importa;
public int getImportancia() {
return importancia;
* Regresa el Panel construido que corresponde a la secci�n.
* @param d El Objeto de base de datos que se usar� para crear el Panel.
* @param ven El Objeto de ventana que se usar� para crear el Panel.
public JPanel getPanelInstance(BaseDeDatosE d, VentanaPrincipal ven)
throws InstantiationException, NoSuchMethodException, IllegalAccessException,
java.lang.reflect.InvocationTargetException {
// Construyo el panel si es que hay uno asociado
Constructor<? extends JPanel> cons = panel.getConstructor(BaseDeDatosE.class, VentanaPrincipal.class);
JPanel panel = cons.newInstance(d, ven);
return panel;
* Devuelve el privilegio asociado a esta secci�n.
public Privilegio getPrivilegio() {
return priv;
* Pone el "bot�n" en RollOver.
* @param btn El "bot�n"
public void setEstadoRollOver(JPanel btn) {
* Pone el "bot�n" en estado presionado.
* @param btn El "bot�n"
public void setEstadoPresionado(JPanel btn) {
* Devuelve la secci�n a la que pertenece.
public Seccion getSec() {
return pa;
* Pone el "bot�n" en estado normal.
* @param btn El "bot�n"
public void setEstadoNormal(JPanel btn) {
The enum type that is getting null.
public enum Seccion {
ALUMNOS(null, "/alumno", "Alumnos",
new Subseccion[] {Subseccion.ALUMNOS_BUSCAR, Subseccion.ALUMNOS_ALTA, Subseccion.ALUMNOS_EDITAR},
null),
PERSONAL(null, "/profesor", "Personal",
new Subseccion[] {Subseccion.PERSONAL_BUSCAR, Subseccion.PERSONAL_ALTA, Subseccion.PERSONAL_EDITAR},
null),
CURSOS(null, "/cursos", "Cursos",
new Subseccion[] {Subseccion.CURSOS, Subseccion.GRUPOS, Subseccion.MATERIAS, Subseccion.ASIGNAR_GRUPOS},
null),
CURSOS_CALIFICAR(CalificarCursos.class, "/default", "Calificar Cursos", null, Privilegio.CALIFICAR_CURSOS),
ASISTENCIA(Asistencia.class, "/default", "Asistencia", null, Privilegio.ASISTENCIA);
private final Class<? extends JPanel> panel;
private final String prefijoImagen;
private final Subseccion[] subs; // Las subseciones de esta secci�n
private final String etiqueta; // El texto que va a llevar el icono
private final Privilegio priv;
Seccion (Class<? extends JPanel> panel, String prefijoImagen, String etiqueta, Subseccion[] subs, Privilegio priv) {
this.panel = panel;
this.prefijoImagen = prefijoImagen;
this.subs = subs;
this.etiqueta = etiqueta;
this.priv = priv;
* Regresa el Panel construido que corresponde a la secci�n.
* @param d El Objeto de base de datos que se usar� para crear el Panel.
* @param ven El Objeto de ventana que se usar� para crear el Panel.
* @return <code>null</code> Si no tiene un panel asociado.
public JPanel getPanelInstance(BaseDeDatosE d, VentanaPrincipal ven)
throws InstantiationException, NoSuchMethodException, IllegalAccessException,
java.lang.reflect.InvocationTargetException {
if (panel != null) {
// Construyo el panel si es que hay uno asociado
Constructor<? extends JPanel> cons = panel.getConstructor(BaseDeDatosE.class, VentanaPrincipal.class);
JPanel panel = cons.newInstance(d, ven);
return panel;
return null;
* Devuelve el privilegio asociado a esta secci�n.
* @return <code>null</code> Si no existe un privilegio asociado.
public Privilegio getPrivilegio() {
return priv;
* Pone el icono de estado RollOver.
* @param etiq El JLabel asociado a esta secci�n
public void setIconoRollOver(JLabel etiq) {
etiq.setIcon( new ImageIcon( getClass().getResource(prefijoImagen + "BtnOver.jpg") ) );
* Pone el icono de estado Presionado.
* @param etiq El JLabel asociado a esta secci�n
public void setIconoPresionado(JLabel etiq) {
etiq.setIcon( new ImageIcon( getClass().getResource(prefijoImagen + "Btn.jpg") ) );
* Pone el icono de estado Normal.
* @param etiq El JLabel asociado a esta secci�n
public void setIconoNormal(JLabel etiq) {
etiq.setIcon( new ImageIcon( getClass().getResource(prefijoImagen + "BtnBco.jpg") ) );
* Obtiene un arreglo con las subsecciones disponibles, en primer lugar la que
* se deber�a mostrar por defecto.
* @return <code>null</code> Si no tiene subsecciones asociadas.
public Subseccion[] getSubsecciones() {
return subs;
* Le pone el texto a la etiqueta que muestra el icono de la secci�n.
public void setTextoIcono(JLabel etiq) {
etiq.setText(etiqueta);
}And if you do
Subseccion.ALUMNOS_ALTA;The message "NULL REFERENCE" is printed. -
Help: a question about the Enum......
Hi,
Now I defined a Enum like below:
public enum Seasons {
winter， spring， summer， fall
} and here below is testing code
System.out.println(Seasons.winter); the console will print 0.
Now I have a variable, its value is 2, so it should be mapping to Seasons.summer
int idx = 2;but how to write the code to get the Seasons.summer?you can't (easily)
and you shouldn't
the whole point is that enumerations are abstract; you shouldn't be able to use them like integers and do arithmetic on them
what are you doing that will require this?
if you really wanted to, the Class class has a method called getEnumConstants() which returns an array of the enum objects in order of their ordinal value; so you could do something like
Seasons.class.getEnumConstants()[2]Edited by: spoon_ on Dec 18, 2007 2:11 AM -
Hi Experts,
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Enum Index{indexOne, index2 ....};
Index ind;
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Is this possible in java? Please suggest.
Thanks,
GanapathiHi - the originator of this question has probably found a good answer to this question, but in case anyone else trips on this along the way:
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http://java.sun.com/j2se/1.5.0/docs/api/java/lang/Enum.html
If it helps to see an example, here's one that follows from an exercise from the Sun tutorial dealing with representing a deck of playing cards. aCard is defined as a two dimensional array (suit, rank) with the suit and rank values defined as enums and used to represent a full deck of cards. A new Card class instance is generated and assigned to the array of cards (i.e. the deck of cards made up of instances of Cards, each named aCard).
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suitLoop:
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rankLoop:
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