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04.21.2008 at 03:27AM PDT, ID: 23339018 | Points: 125
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Getting the value of a constant from the name (in a string)

Tags: Delphi
i have  a  string with the name of a constant i need to get the value of that constant
in Delphi

Ideas?
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Question Stats
Zone: Programming
Question Asked By: JodieP
Question Asked On: 04.21.2008
Participating Experts: 8
Points: 125
Views: 0
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04.21.2008 at 03:35AM PDT, ID: 21400146

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04.21.2008 at 03:37AM PDT, ID: 21400160

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04.21.2008 at 03:43AM PDT, ID: 21400196

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04.21.2008 at 03:57AM PDT, ID: 21400289

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04.21.2008 at 04:04AM PDT, ID: 21400339

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04.21.2008 at 04:11AM PDT, ID: 21400392

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04.21.2008 at 04:14AM PDT, ID: 21400409

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04.21.2008 at 04:22AM PDT, ID: 21400439

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04.21.2008 at 04:28AM PDT, ID: 21400481

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04.21.2008 at 04:38AM PDT, ID: 21400521

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04.21.2008 at 04:39AM PDT, ID: 21400526

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04.21.2008 at 04:52AM PDT, ID: 21400598

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04.21.2008 at 04:54AM PDT, ID: 21400606

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04.21.2008 at 05:02AM PDT, ID: 21400664

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04.21.2008 at 05:03AM PDT, ID: 21400676

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04.21.2008 at 05:12AM PDT, ID: 21400757

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04.21.2008 at 05:22AM PDT, ID: 21400835

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04.21.2008 at 05:25AM PDT, ID: 21400852

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04.21.2008 at 05:25AM PDT, ID: 21400857

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04.21.2008 at 05:27AM PDT, ID: 21400864

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04.21.2008 at 05:28AM PDT, ID: 21400879

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04.21.2008 at 05:30AM PDT, ID: 21400891

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04.21.2008 at 05:32AM PDT, ID: 21400915

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04.21.2008 at 05:39AM PDT, ID: 21400969

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04.21.2008 at 05:41AM PDT, ID: 21400979

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04.21.2008 at 05:44AM PDT, ID: 21401006

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04.21.2008 at 05:46AM PDT, ID: 21401021

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04.21.2008 at 05:47AM PDT, ID: 21401034

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04.21.2008 at 05:47AM PDT, ID: 21401036

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04.21.2008 at 05:48AM PDT, ID: 21401042

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04.21.2008 at 05:51AM PDT, ID: 21401066

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04.21.2008 at 05:52AM PDT, ID: 21401075

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04.21.2008 at 05:54AM PDT, ID: 21401107

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04.21.2008 at 05:55AM PDT, ID: 21401117

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04.21.2008 at 05:58AM PDT, ID: 21401144

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04.21.2008 at 05:59AM PDT, ID: 21401159

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04.21.2008 at 06:05AM PDT, ID: 21401220

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04.21.2008 at 06:36AM PDT, ID: 21401522

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04.21.2008 at 06:37AM PDT, ID: 21401543

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04.21.2008 at 08:04AM PDT, ID: 21402604

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04.21.2008 at 10:08AM PDT, ID: 21403859

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06.11.2008 at 08:20AM PDT, ID: 21760978

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06.11.2008 at 07:59PM PDT, ID: 21765928

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06.12.2008 at 03:27PM PDT, ID: 21774218

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04.21.2008 at 03:35AM PDT, ID: 21400146
Something like this ?

const
  A = 'A';
  B = 'A';


Name of 'A' --> not possible ...
 
04.21.2008 at 03:37AM PDT, ID: 21400160

Rank: Wizard

what you want is not possible.

Does is have to be an constant?
 
04.21.2008 at 03:43AM PDT, ID: 21400196

Rank: Guru

Perhaps you can tell us more about your situation.
 
04.21.2008 at 03:57AM PDT, ID: 21400289

Rank: Wizard

well, actually, it depends on what kind of constant it is
lets say you are using enums, you can use GetEnuName

eg.

Here's how to display the string represention of a Delphi enum type at runtime.

~~~~~~~~~~~~~~~~~~~~~~~~~
{
Suppose enum:

TProgrammerType = (tpDelphi, tpVisualC, tpVB, tpJava) ;
}

uses TypInfo;
var s: string;
s := GetEnumName(TypeInfo(TProgrammerType),
                  integer(tpDelphi)) ;

//s='tpDelphi'
 
04.21.2008 at 04:04AM PDT, ID: 21400339

Rank: Sage

and again if you declare the constant as a resourcestring, you can get the value, but it's a little bit more complicated and you would need to have the drc file as well in your exe (probably embedding it as a resource as well).
 
04.21.2008 at 04:11AM PDT, ID: 21400392
well i m reading the names of the variables from a file
the file format cannot be changed

There are about 700 variables names in the file
 
04.21.2008 at 04:14AM PDT, ID: 21400409

Rank: Wizard

but can you change the way this data is stored in your app?

are these all constants, variables? Can you keep them in a stringlist instead?
 
04.21.2008 at 04:22AM PDT, ID: 21400439
these are all constants
I dont think i can change these constants as tehy are used all over the system

how could i add them to a stringlist?
 
04.21.2008 at 04:28AM PDT, ID: 21400481

Rank: Wizard

by using the stringlist in a key - value way:

1:
2:
3:
4:
5:
6:
7: