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getPreferencesValue
Parses and gets values of chosen tags attributes in a XML file of preferences
Syntax
Values = getPreferencesValue(path2tag, attributes) Values = getPreferencesValue(path2tag, attributes, XMLsource)
Arguments
- path2tag
unique string: in the XML source file, path targeting a chosen tag whose attributes must be read. The path is the list of nested tags leading to the required one, such as
"/a/b/c/d", or equivalently"//b/c/d". It is case-sensitive.- attributes
vector or matrix of strings: names of attributes of the chosen tag, whose values must be read. The order of attributes does not matter wrt their actual order in the tag.
- Attributes names are case-sensitive.
- If needed, the name of a given attribute may be specified several times.
- XMLsource
points to the XML document from which informations must be extracted. It can be one of the following:
- unique string: path to the XML source file (where preferences are
registered). By default,
SCIHOME+'/XConfiguration.xml'is considered. - XML handle of type
XMLdoc, as returned by a priorxmlRead(XMLsource)external instruction.
- unique string: path to the XML source file (where preferences are
registered). By default,
- Values
matrix of strings: Values of the chosen attributes of the chosen tag:
- If the set of chosen
attributesis provided as a matrix with several rows, then only the first occurrence of the chosen tag is considered, andValues(i,j)is the value of itsattributes(i,j). - Otherwise, if the names of
attributesare provided in a row vector, then all occurences of the chosen tag are considered: Results are returned with one row per occurrence, and one colum per attribute. Thus,Values(i,j)is the value of theattributes(j)for theithoccurrence of the tag in the document.
evstr()may be applied to them to get expected numbers.- If the set of chosen
Description
When an XML handle returned by xmlRead(..) is provided as
XMLsource, getPreferencesValue() uses it
directly to parse the XML Preferences document opened by this prior
xmlRead(..). This is useful when the same document must be parsed with
multiple calls to getPreferencesValue(), typically to address
different XML tags. In this case, one should not forget to close the XML document after
its whole processing.
When the path of the XML Preferences file is provided as XMLsource,
getPreferencesValue() opens the file, builds its DOM tree, parses
the tree for the chosen tag and attributes, and finally deletes the tree and closes the
file before returning results. This is what occurs with the default Xconfiguration.xml
file when no explicit XMLsource is specified.
The path2tag argument must be a valid "XPath" according to the
W3C recommandations.
Examples are given herebelow. If the path uses a intermediate or a final tag that does
not exist, or if one of the queried attributes does not exist, an error is yielded.
Examples
Example 1:Your web and proxy settings for Scilab are stored in the default
SCIHOME+'/XConfiguration.xml' preferences file. Let's consider the
following excerpt of the file:
<?xml version="1.0" encoding="utf-8" standalone="no"?> <interface height="600" path="1/" version="0.17" width="800"> <general title="_(General)"> ... </general> <web title="_(Web)"> <body> <web command-browser="" command-mailer="" default-browser="true" default-mailer="true"/> <proxy enabled="false" host="" password="" port="" user=""/> <previous-proxy enabled="false" host="" password="" port="" user=""/> </body> </web> ... </interface>
To get some informations about the proxy parameters (proxy tag), the required code will be:
proxy = getPreferencesValue("//web/body/proxy", ["enabled", "host", "port"]);
Example 2:
getPreferencesValue() can also be used to get values of a tag
having multiple occurrences in the XMLsource file. For instance,
your preferences for the Scilab's editor Scinotes are stored in the
SCIHOME\scinotesConfiguration.xml file. The list of most recent files
opened in Scinotes is stored in the following part and path:
<?xml version="1.0" encoding="utf-8" standalone="no"?> <Setting version="0.42"> <!-- SCINOTES configuration --> <Profile name="scinotes"> <!-- .../... --> <!-- Recent Opened Files Section --> <recentFiles> <document path="C:\Path\to\my\first\working\dir\ged_move_entity.sci"/> <document path="C:\Path\to\my\first\working\dir\ged_loop.sci"/> <document path="C:\Path\to\my\first\working\dir\test_legend_move.sce"/> <document path="C:\Path\to\another\working\dir2\clf.sci"/> </recentFiles> <!-- .../... --> </Profile> </Setting>
Then, the following code will extract, return and display the column of recent files:
scinotesFile = SCIHOME + "/scinotesConfiguration.xml"; recent = getPreferencesValue("//Setting/Profile/recentFiles/document", "path", scinotesFile); mprintf("%s\n", recent)
C:\Path\to\my\first\working\dir\ged_move_entity.sci C:\Path\to\my\first\working\dir\ged_loop.sci C:\Path\to\my\first\working\dir\test_legend_move.sce C:\Path\to\another\working\dir2\clf.sci
See also
- setPreferencesValue — Set preferences value
- xmlXPath — Make a XPath query on a XML document
- XML path language
- xmlRead — Read a XML stream from a local or distant file
- xmlDelete — Delete a XML document
- atomsGetConfig — Get ATOMS system parameters
- printsetupbox — Display print dialog box.
- csvDefault — Get or set defaults behavior for csv files.
History
| Версия | Описание |
| 5.5.0 | getPreferencesValue() introduced. |
| 6.0.0 |
|
| Report an issue | ||
| << Preferences | Preferences | preferences >> |