Overview

INI files are still useful to provide settings to an application. Vista is not going to change this. The Windows API methods provided to read a particular value have an advantage: they follow a clearly defined search path, and following that path they take not only the INI file into account, they also check the Windows registry and the command line parameter. Furthermore, they deliver always up-to-date values.

They have disadvantages as well:

If you are not interested in the Windows registry and command line parameters, and if you are not changing your INI files while the application is running, then the "IniFile" class introduced in this article might attract your attention.

This class allows you to use a kind of APL-Syntax in your INI files.

Details

An entry like:

HomeFolder='C:/Windows/Appl/'

results in a string holding the path, but an entry like:

FormSize=300 400

results in a two-element-vector "FormSize" holding two integers.

Furthermore, an entry like:

LogFolder='{"HomeFolder}Logsfiles/'

is treated in a special way: the name between the curlies is taken as the name of an alreday defined value. It is then replaced by the value of that entry.

After creating an instance from the class:

MyIni←⎕New #.IniClass 'C:/Appl/Example.ini'

you can get all information you are interested in by calling the only method "Get". Given this file "Example.ini": 

[GENERAL]
MaxNoOfErrors=20
FormSize=800 1200
LogfileFlag=1
LogLevels=1 2 3 ; from 1 to 9

[DIR]
Home='C:/mainfolder/'
AppFolder='{Home}appls/'
DocsFolder='{Home}docs/'
LogFileFolder='{Home}Logs/'

You can get any level of information you are interested in:

Examples

      MyIni.Get ⍬ ⍬ 
 GENERAL                                      
          MAXNOOFERRORS                    20 
          FORMSIZE                   800 1200 
          LOGFILEFLAG                       1 
          LOGLEVELS                     1 2 3 
 DIR                                          
          HOME                 C:/mainfolder/ 
          APPFOLDER      C:/mainfolder/appls/ 
          DOCSFOLDER      C:/mainfolder/docs/ 
          LOGFILEFOLDER   C:/mainfolder/Logs/ 
      MyIni.Get'General' ⍬
MAXNOOFERRORS        20 
FORMSIZE       800 1200 
LOGFILEFLAG           1 
LOGLEVELS         1 2 3 
      MyIni.Get'General' 'FormSize'
800 1200
      ¯1 MyIni.Get'General' 'Unknown' ⍝ with default
¯1
      MyIni.Get'General' 'Unknown' ⍝ without default
Value Error: "Unknown"
myDoc.Get'General' 'Unknown'

>> [:IniFiles/Script:The Script]

Author: Kai Jaeger

CategoryDyalog CategoryScripts