Android Question Enum

[Terradrones]

Hi All

I have this in VB.net:

[
Public Enum UTMDatum
WGS84
NAD83
GRS80
WGS72
Australian1965
Krasovsky1940
NorthAmerican1927
International1924
Hayford1909
Clarke1880
Clarke1866
Airy1830
Bessel1841
Everest1830
End Enum
]

Which I wrote in B4A as:

[

Public Enum UTMDatum(WGS84,NAD83,GRS80, WGS72,Australian1965,Krasovsky1940,NorthAmerican1927,International1924,Hayford1909,Clarke1880,Clarke1866,Airy1830,Bessel1841,Everest1830)

]

But it is not working. Any hints please?

 

[LucaMs]

Use a code module and declare all that "fields" as public constants.

Public Const WGS84 As Int = 1
Public Const NAD83 As Int = 2
Public Const GRS80 As Int = 3
Public Const WGS72 As Int = 4
Public Const Australian1965 As Int = 5
Public Const Krasovsky1940 As Int = 6
Public Const NorthAmerican1927 As Int = 7
Public Const International1924 As Int = 8
Public Const Hayford1909 As Int = 9
Public Const Clarke1880 As Int = 10
Public Const Clarke1866 As Int = 11
Public Const Airy1830 As Int = 12
Public Const Bessel1841 As Int = 13
Public Const Everest1830 As Int = 14

If MyVariable = UTMDatum.Krasovsky1940 Then
...

Select MyVariable

    Case UTMDatum.GRS80
        '...
    Case UTMDatum.Everest1830
        '...
End Select

 

[ddk1]

This thread suggests that Enum function (per VisualBasic) has been implemented in B4A.
If I try the code above, Enum is highlighted in red and doesn't appear to work as expected.
I cannot find any documentation that suggests Enum is now implemented.

 

[LucaMs]

This thread suggests that Enum function (per VisualBasic) has been implemented in B4A.
If I try the code above, Enum is highlighted in red and doesn't appear to work as expected.
I cannot find any documentation that suggests Enum is now implemented.

Enum was not implemented.

In the example above, it was suggested to use a code module (I confirm that in my opinion it is the best way) named UTMDatum (obviously it is the suggested name for the needs of the OP).

 

[emexes]

Any hints please?

This is a bit of a long-shot hint, but... depending on how the enum is used, a Map might work too:

Dim Datums() As String = Array As String( _
    "WGS84", _                '0
    "NAD83", _                '1
    "GRS80", _                '2
    "WGS72", _                '3
    "Australian1965", _       '4
    "Krasovsky1940", _        '5
    "NorthAmerican1927", _    '6
    "International1924", _    '7
    "Hayford1909", _          '8
    "Clarke1880", _           '9
    "Clarke1866", _           '10
    "Airy1830", _             '11  https://en.wikipedia.org/wiki/George_Biddell_Airy#Reference_geoid
    "Bessel1841", _           '12
    "Everest1830" _           '13
)

Dim dm As Map
dm.Initialize

For I = 0 To Datums.Length - 1
    dm.Put(Datums(I), I)
Next

Log(dm.Get("Airy1830"))

 

[emexes]

Any hints please?

Maybe a 2d table (array of arrays, or map of arrays) might work too.

https://en.wikipedia.org/wiki/Earth_ellipsoid#Historical_Earth_ellipsoids

although tbh I'm pretty sure that some datums are defined using more than the two or three parameters shown in that table.

 

[emexes]

Enum was not implemented.

Just realised I got "tricked" into responding to an old thread by a new reply thank you @LucaMs sorry, I mean @ddk1

 

[LucaMs]

This is a bit of a long-shot hint, but... depending on how the enum is used, a Map might work too:

Dim Datums() As String = Array As String( _
    "WGS84", _                '0
    "NAD83", _                '1
    "GRS80", _                '2
    "WGS72", _                '3
    "Australian1965", _       '4
    "Krasovsky1940", _        '5
    "NorthAmerican1927", _    '6
    "International1924", _    '7
    "Hayford1909", _          '8
    "Clarke1880", _           '9
    "Clarke1866", _           '10
    "Airy1830", _             '11  https://en.wikipedia.org/wiki/George_Biddell_Airy#Reference_geoid
    "Bessel1841", _           '12
    "Everest1830" _           '13
)

Dim dm As Map
dm.Initialize

For I = 0 To Datums.Length - 1
    dm.Put(Datums(I), I)
Next

Log(dm.Get("Airy1830"))

That code cannot replace Enums.
The names of the constants that are part of an Enum must be visible and easily written (listed by the IDE) in a project.
In a previous post:

If MyVariable = UTMDatum.Krasovsky1940 Then

 

[ddk1]

Thankyou, I finally get it.