[2 days left] What’s wrong with your cloud strategy? Learn why multicloud solutions matter with Nimble Storage.Register Now

x
?
Solved

Simple: Help with arrays & sets problem

Posted on 2006-06-20
1
Medium Priority
?
159 Views
Last Modified: 2010-04-05
Using:Delphi 7

Trying to come up with an efficient way to report and log errors. Here is a working solution/example if error codes are sequential.

//defined in a 3rd party dll header file:
TDisk         = $01
TTape        = $02
TPrinter      = $03
TProcessor = $04

//Code:
type
  TErrorType = (TDisk, TTape, TPrinter, TProcessor);

var
  TErrorTypeName: array[TErrorType] of
  string = ('Disk Drive', 'Tape Drive', 'Printer', 'Processor');

...
output := 'Error Received: ' + TErrorTypeName[TErrorType(TExampleResultRecord.ErrorResult)];


Problem is I'm importing from third party DLLs and error/status codes are not always sequential depending on what command I'm executing. What I tried and failed to do:

//defined in dll header file:
TDisk         = $E1
TTape        = $13
TPrinter      = $33
TProcessor = $24

//Code:
type
  TErrorType = (TDisk = $E1, TTape = $13, TPrinter = $33, TProcessor = #24); //set specific ordinal values to each element

var
  TErrorTypeName: array[TErrorType] of
  string = ('Disk Drive', 'Tape Drive', 'Printer', 'Processor');

...

***Compiler Error:
Number of elements differs from declaration

Just need some input on that most efficient/readable way of accomplishing this. Im trying to avoid creating a function to manually assign a name to a error/status code, since in reality I'm dealing with over 300 of 'em, thx.
0
Comment
Question by:Jebtrix
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
1 Comment
 
LVL 17

Accepted Solution

by:
TheRealLoki earned 320 total points
ID: 16947281
I don't think you can do it with 1 set, and I don't think you can do it without using at least 1 function.
However, itis not all as bad as you think
you can do this :-

output := 'Error Received: ' + TErrorTypeName[IndexOfErrorResult(TExampleResultRecord.ErrorResult)];

by having the following defined

const
    MaxErrorTypeElements = 4;
    TErrorTypeName: array[1..MaxErrorTypeElements] of string = ('Disk Drive', 'Tape Drive', 'Printer', 'Processor');
    TErrorTypeValue: array[1..MaxErrorTypeElements] of integer= ($E1, $13, $33, $24);

function TForm1.IndexOfErrorResult(errres: integer): integer;
    var
        i: integer;
    begin
        result := -1;
        i := 0;
        while (result = -1) and (i <= MaxErrorTypeElements) do
        begin
            if TErrorTypeValue[i] = errres then result := i else inc(i);
        end;
    end;

hth, Loki
0

Featured Post

Free Tool: Site Down Detector

Helpful to verify reports of your own downtime, or to double check a downed website you are trying to access.

One of a set of tools we are providing to everyone as a way of saying thank you for being a part of the community.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Objective: - This article will help user in how to convert their numeric value become words. How to use 1. You can copy this code in your Unit as function 2. than you can perform your function by type this code The Code   (CODE) The Im…
Creating an auto free TStringList The TStringList is a basic and frequently used object in Delphi. On many occasions, you may want to create a temporary list, process some items in the list and be done with the list. In such cases, you have to…
Have you created a query with information for a calendar? ... and then, abra-cadabra, the calendar is done?! I am going to show you how to make that happen. Visualize your data!  ... really see it To use the code to create a calendar from a q…
We’ve all felt that sense of false security before—locking down external access to a database or component and feeling like we’ve done all we need to do to secure company data. But that feeling is fleeting. Attacks these days can happen in many w…
Suggested Courses

656 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question