CODEWITHSUNDEEP
delphidelphi-2010
Blow ThemUp
Blow ThemUp

Reputation: 905

Retrieving a string from array of string const

How do I get the string representation if I know the enum of integer value ?

type    
  MyEnum = (tmp_one, tmp_two, tmp_three);

const
  MyTypeNames: array[tmp_one..tmp_three] of string = ('One', 'Two', 'Three');

Upvotes: 0

Views: 238

Answers (3)

Marjan Venema
Marjan Venema

Reputation: 19356

You don't need to use the ordinal values of your enum type. You can declare an array with the enum type as its "subscript" and use an enum var directly.

type    
  TMyEnum = (tmp_one, tmp_two, tmp_three);

const
  MyTypeNames: array[TMyEnum] of string = ('One', 'Two', 'Three');

function Enum2Text(aEnum: TMyEnum): string;
begin
  Result := MyTypeNames[aEnum]; 
end;

Call it with the enum or an integer value cast to the enum:

Enum2Text(tmp_one);     // -> 'One'
Enum2Text(TMyEnum(2));  // -> 'Three'

Upvotes: 4

Andreas Rejbrand
Andreas Rejbrand

Reputation: 109003

I assume you want to use the names in your array of string. Then this is very simple:

var
  myEnumVar: MyEnum;
begin
  myEnumVar := tmp_two; // For example
  ShowMessage(MyTypeNames[myEnumVar]);

Upvotes: 6

David Heffernan
David Heffernan

Reputation: 613461

I'm assuming that you have an ordinal value rather than a variable of this enumerated type. If so then you just need to cast the ordinal to the enumerated type. Like this:

function GetNameFromOrdinal(Ordinal: Integer): string;
begin
  Result := MyTypeNames[MyEnum(Ordinal)]; 
end;

Upvotes: 6

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