2002-04-28 20:41:17 +04:00
|
|
|
<html>
|
|
|
|
|
<body>
|
|
|
|
|
|
|
|
|
|
<!-- NEW PAGE -->
|
|
|
|
|
|
|
|
|
|
<h2>class Fl_Preferences</h2>
|
|
|
|
|
|
|
|
|
|
<hr>
|
|
|
|
|
|
|
|
|
|
<h3>Class Hierarchy</h3>
|
|
|
|
|
|
|
|
|
|
<ul><pre>
|
2002-05-01 02:25:18 +04:00
|
|
|
<b>Fl_Preferences</b></a></H4>
|
2002-04-28 20:41:17 +04:00
|
|
|
</pre></ul>
|
|
|
|
|
|
|
|
|
|
<h3>Include Files</h3>
|
|
|
|
|
|
|
|
|
|
<ul><pre>
|
|
|
|
|
#include <FL/Fl_Preferences.H>
|
|
|
|
|
</pre></ul>
|
|
|
|
|
|
|
|
|
|
<h3>Description</h3>
|
|
|
|
|
|
|
|
|
|
<P><tt>Fl_Preferences </tt>provides methods to store user
|
|
|
|
|
setting between application starts. It is similar to the
|
|
|
|
|
Registry on WIN32 and Preferences on MacOS, and provides a
|
|
|
|
|
simple configuration mechanism for UNIX.
|
|
|
|
|
|
|
|
|
|
<P><tt>Fl_Preferences </tt>uses a hierarchy to store data. It
|
|
|
|
|
bundles similar data into groups and manages entries into those
|
|
|
|
|
groups as name/value pairs.
|
|
|
|
|
|
|
|
|
|
<P>Preferences are stored in text files that can be edited
|
|
|
|
|
manually. The file format is easy to read and relatively
|
|
|
|
|
forgiving. Preferences files are the same on all platforms. User
|
|
|
|
|
comments in preference files are preserved. Filenames are unique
|
|
|
|
|
for each application by using a vendor/application naming
|
|
|
|
|
scheme. The user must provide default values for all entries to
|
|
|
|
|
ensure proper operation should preferences be corrupted or not
|
|
|
|
|
yet exist.
|
|
|
|
|
|
|
|
|
|
<P>Entries can be of any length. However, the size of each
|
|
|
|
|
preferences file should be kept under 100k for performance
|
|
|
|
|
reasons. One application can have multiple preferences files.
|
|
|
|
|
Extensive binary data however should be stored in seperate
|
|
|
|
|
files; see the <A
|
|
|
|
|
href="#Fl_Preferences.getUserdataPath"><tt>getUserdataPath()</tt></A>
|
|
|
|
|
method.
|
|
|
|
|
|
|
|
|
|
<h3>Methods</h3>
|
|
|
|
|
|
|
|
|
|
<ul>
|
|
|
|
|
|
|
|
|
|
<li><a href="#Fl_Preferences.Fl_Preferences">Fl_Preferences</a></li>
|
|
|
|
|
<li><a href="#Fl_Preferences.~Fl_Preferences">~Fl_Preferences</a></li>
|
|
|
|
|
<li><a href="#Fl_Preferences.deleteEntry">deleteEntry</a></li>
|
|
|
|
|
<li><a href="#Fl_Preferences.deleteGroup">deleteGroup</a></li>
|
|
|
|
|
<li><a href="#Fl_Preferences.entries">entries</a></li>
|
|
|
|
|
<li><a href="#Fl_Preferences.entry">entry</a></li>
|
|
|
|
|
<li><a href="#Fl_Preferences.entryExists">entryExists</a></li>
|
|
|
|
|
<li><a href="#Fl_Preferences.get">get</a></li>
|
|
|
|
|
<li><a href="#Fl_Preferences.getUserdataPath">getUserdataPath</a></li>
|
|
|
|
|
<li><a href="#Fl_Preferences.group">group</a></li>
|
|
|
|
|
<li><a href="#Fl_Preferences.groupExists">groupExists</a></li>
|
|
|
|
|
<li><a href="#Fl_Preferences.groups">groups</a></li>
|
|
|
|
|
<li><a href="#Fl_Preferences.set">set</a></li>
|
|
|
|
|
<li><a href="#Fl_Preferences.size">size</a></li>
|
2002-05-01 02:25:18 +04:00
|
|
|
<li><a href="#Fl_Preferences.Name">Name</a></li>
|
2002-04-28 20:41:17 +04:00
|
|
|
|
|
|
|
|
</ul>
|
|
|
|
|
|
|
|
|
|
<H4><a name="Fl_Preferences.Fl_Preferences">Fl_Preferences(enum Root root,
|
|
|
|
|
const char *vendor, const char *application)<BR>
|
|
|
|
|
Fl_Preferences(Fl_Preferences &p, const char *groupname)</a></H4>
|
|
|
|
|
|
|
|
|
|
<P>The constructor creates a group that manages name/value pairs and
|
|
|
|
|
child groups. Groups are ready for reading and writing at any time.
|
|
|
|
|
The <tt>root</tt> argument is either <tt>Fl_Preferences::USER</tt>
|
|
|
|
|
or <tt>Fl_Preferences::SYSTEM</tt>.
|
|
|
|
|
|
|
|
|
|
<P>The first format creates the <i>base</i> instance for all
|
|
|
|
|
following entries and reads existing databases into memory. The
|
|
|
|
|
<tt>vendor</tt> argument is a unique text string identifying the
|
|
|
|
|
development team or vendor of an application. A domain name or
|
|
|
|
|
an EMail address are great unique names, e.g.
|
|
|
|
|
"researchATmatthiasm.com" or "fltk.org". The
|
|
|
|
|
<tt>application</tt> argument can be the working title or final
|
|
|
|
|
name of your application. Both <tt>vendor</tt> and
|
|
|
|
|
<tt>application</tt> must be valid relative UNIX pathnames and
|
|
|
|
|
may contain '/'s to create deeper file structures.
|
|
|
|
|
|
|
|
|
|
<P>The <tt>groupname</tt> argument identifies a group of
|
|
|
|
|
entries. It can contain '/'s to get quick access to individual
|
|
|
|
|
elements inside the hierarchy.
|
|
|
|
|
|
|
|
|
|
<H4><a name="Fl_Preferences.~Fl_Preferences">~Fl_Preferences()</a></H4>
|
|
|
|
|
|
|
|
|
|
<P>The destructor removes allocated resources. When used on the
|
|
|
|
|
<i>base</i> preferences group, the destructor flushes all
|
|
|
|
|
changes to the preferences file and deletes all internal
|
|
|
|
|
databases.
|
|
|
|
|
|
|
|
|
|
<H4><a name="Fl_Preferences.deleteEntry">int Fl_Preferences::deleteEntry(const char *entry)</a></H4>
|
|
|
|
|
|
|
|
|
|
<P>Removes a single entry (name/value pair).
|
|
|
|
|
|
|
|
|
|
<H4><a name="Fl_Preferences.deleteGroup">int Fl_Preferences::deleteGroup(const char *groupname)</a></H4>
|
|
|
|
|
|
|
|
|
|
<P>Deletes a group.
|
|
|
|
|
|
|
|
|
|
<H4><a name="Fl_Preferences.entries">int Fl_Preferences::entries()</a></H4>
|
|
|
|
|
|
|
|
|
|
<P>Returns the number of entries (name/value) pairs in a group.
|
|
|
|
|
|
|
|
|
|
<H4><a name="Fl_Preferences.entry">const char *Fl_Preferences::entry(int ix)</a></H4>
|
|
|
|
|
|
|
|
|
|
<P>Returns the name of an entry. There is no guaranteed order of
|
|
|
|
|
entry names. The index must be within the range given by
|
|
|
|
|
<tt>entries()</tt>.
|
|
|
|
|
|
|
|
|
|
<H4><a name="Fl_Preferences.entryExists">int Fl_Preferences::entryExists(const char *entry)</a></H4>
|
|
|
|
|
|
|
|
|
|
<P>Returns non-zero if an entry with this name exists.
|
|
|
|
|
|
|
|
|
|
<H4><a name="Fl_Preferences.flush">void Fl_Preferences::flush()</a></H4>
|
|
|
|
|
|
|
|
|
|
<P>Write all preferences to disk. This function works only with
|
|
|
|
|
the base preference group. This function is rarely used as
|
|
|
|
|
deleting the base preferences flushes automatically.
|
|
|
|
|
|
|
|
|
|
<H4><a name="Fl_Preferences.getUserdataPath">int Fl_Preferences::getUserdataPath(char *path)</a></H4>
|
|
|
|
|
|
|
|
|
|
<P>Creates a path that is related to the preferences file and
|
|
|
|
|
that is usable for application data beyond what is covered by
|
|
|
|
|
<tt>Fl_Preferences</tt>.
|
|
|
|
|
|
2002-05-01 02:25:18 +04:00
|
|
|
<H4><a name="Fl_Preferences.get">int get(const char *entry, int &value, int defaultValue)<BR>
|
|
|
|
|
int get(const char *entry, int &value, int defaultValue)<BR>
|
|
|
|
|
int get(const char *entry, float &value, float defaultValue)<BR>
|
|
|
|
|
int get(const char *entry, double &value, double defaultValue )<BR>
|
|
|
|
|
int get(const char *entry, char *&text, const char *defaultValue)<BR>
|
2002-05-18 01:17:05 +04:00
|
|
|
int get(const char *entry, char *text, const char *defaultValue, int maxLength)<BR>
|
2002-05-01 02:25:18 +04:00
|
|
|
int get(const char *entry, void *&data, const void *defaultValue, int defaultSize)<BR>
|
|
|
|
|
int get(const char *entry, void *data, const void *defaultValue, int defaultSize,
|
2002-04-28 20:41:17 +04:00
|
|
|
int maxSize)</a></H4>
|
|
|
|
|
|
|
|
|
|
<P>Reads an entry from the group. A default value must be
|
|
|
|
|
supplied. The return value indicates if the value was available
|
|
|
|
|
(non-zero) or the default was used (0). If the '<tt>char
|
2002-05-01 02:25:18 +04:00
|
|
|
*&text</tt>' or '<tt>void *&data</tt>' form is used,
|
|
|
|
|
the resulting data must be freed with '<tt>free(value)</tt>'.
|
2002-05-18 01:17:05 +04:00
|
|
|
<P>'<tt>maxLength</tt>' is the maximum length of text that will be read. The text buffer must allow for one additional byte for a trailling zero.
|
2002-04-28 20:41:17 +04:00
|
|
|
|
|
|
|
|
<H4><a name="Fl_Preferences.group">const char
|
|
|
|
|
*Fl_Preferences::group(int ix)</a></H4>
|
|
|
|
|
|
|
|
|
|
<P>Returns the name of the Nth group. There is no guaranteed
|
|
|
|
|
order of group names. The index must be within the range given
|
|
|
|
|
by <tt>groups()</tt>.
|
|
|
|
|
|
|
|
|
|
<H4><a name="Fl_Preferences.groupExists">int Fl_Preferences::groupExists(const char *groupname)</a></H4>
|
|
|
|
|
|
|
|
|
|
<P>Returns non-zero if a group with this name exists.
|
2002-09-06 00:44:36 +04:00
|
|
|
Groupnames are relative to the Preferences node and can contain a path.
|
|
|
|
|
<tt>"."</tt> describes the current node, <tt>"./"</tt> describes the topmost node.
|
|
|
|
|
By preceding a groupname with a <tt>"./"</tt>, its path becomes relative to the topmost node.
|
2002-04-28 20:41:17 +04:00
|
|
|
|
|
|
|
|
<H4><a name="Fl_Preferences.groups">int Fl_Preferences::groups()</a></H4>
|
|
|
|
|
|
|
|
|
|
<P>Returns the number of groups that are contained within a
|
|
|
|
|
group.
|
|
|
|
|
|
|
|
|
|
<H4><a name="Fl_Preferences.set">int set(const char *entry, int value)<BR>
|
|
|
|
|
int set(const char *entry, int value)<BR>
|
|
|
|
|
int set(const char *entry, float value)<BR>
|
|
|
|
|
int set(const char *entry, double value)<BR>
|
2002-05-01 02:25:18 +04:00
|
|
|
int set(const char *entry, const char *text)<BR>
|
|
|
|
|
int set(const char *entry, const void *data, int size)</a></H4>
|
2002-04-28 20:41:17 +04:00
|
|
|
|
2002-05-01 02:25:18 +04:00
|
|
|
<P>Sets an entry (name/value pair). The return value indicates if there
|
2002-04-28 20:41:17 +04:00
|
|
|
was a problem storing the data in memory. However it does not
|
|
|
|
|
reflect if the value was actually stored in the preferences
|
|
|
|
|
file.
|
|
|
|
|
|
|
|
|
|
<H4><a name="Fl_Preferences.size">int Fl_Preferences::size(const char *key)</a></H4>
|
|
|
|
|
|
|
|
|
|
<P>Returns the size of the value part of an entry.
|
|
|
|
|
|
2002-05-01 02:25:18 +04:00
|
|
|
<H4><a name="Fl_Preferences.Name">
|
|
|
|
|
Fl_Preferences::Name( unsigned int numericName )<BR>
|
|
|
|
|
Fl_Preferences::Name( const char *format, ... )
|
|
|
|
|
</a></H4>
|
|
|
|
|
|
|
|
|
|
<P>'Name' provides a simple method to create numerical or more complex
|
|
|
|
|
procedural names for entries and groups on the fly,
|
|
|
|
|
i.e. <tt>prefs.set(Fl_Preferences::Name("File%d",i),file[i]);</tt>.
|
|
|
|
|
See <tt>test/preferences.cxx</tt> as a sample for writing arrays into preferences.<p>
|
|
|
|
|
'Name' is actually implemented as a class inside Fl_Preferences. It casts
|
|
|
|
|
into <tt>const char*</tt> and gets automatically destroyed after the enclosing call.
|
|
|
|
|
|
2002-04-28 20:41:17 +04:00
|
|
|
|
|
|
|
|
</body>
|
|
|
|
|
</html>
|
