mirror of https://github.com/fltk/fltk
Improved documentation of Fl_Preferences.
Detailed information on how preference file paths are generated, and preliminary docs what happens if that fails. Documentation, on what FLTK die pre 1.4 when any of this failed. Also, a little TODO list for me that I will hopefully get to in the next days.
This commit is contained in:
Matthias Melcher
parent
7e0c82637d
commit
006d71c663
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@ -98,31 +98,69 @@ unsigned int Fl_Preferences::file_access()
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}
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/**
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The constructor creates a group that manages name/value pairs and
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child groups. Groups are ready for reading and writing at any time.
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The root argument is either Fl_Preferences::USER
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or Fl_Preferences::SYSTEM.
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The constructor creates a group that manages name/value pairs and
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child groups. Groups are ready for reading and writing at any time.
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The root argument is either Fl_Preferences::USER
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or Fl_Preferences::SYSTEM.
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This constructor creates the <i>base</i> instance for all
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following entries and reads existing databases into memory. The
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vendor argument is a unique text string identifying the
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development team or vendor of an application. A domain name or
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an EMail address are great unique names, e.g.
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"researchATmatthiasm.com" or "fltk.org". The
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application argument can be the working title or final
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name of your application. Both vendor and
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application must be valid relative UNIX pathnames and
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may contain '/'s to create deeper file structures.
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This constructor creates the <i>base</i> instance for all
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following entries and reads existing databases into memory. The
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vendor argument is a unique text string identifying the
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development team or vendor of an application. A domain name or
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an EMail address are great unique names, e.g.
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"research.matthiasm.com" or "fluid.fltk.org". The
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application argument can be the working title or final
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name of your application. Both vendor and
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application must be valid UNIX path segments and
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may contain forward slashes to create deeper file structures.
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A set of Preferences marked "run-time" exists exactly one per application and
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only as long as the application runs. It can be used as a database for
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volatile information. FLTK uses it to register plugins at run-time.
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A set of Preferences marked "run-time" exists exactly once per application and
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only as long as the application runs. It can be used as a database for
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volatile information. FLTK uses it to register plugins at run-time.
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\param[in] root can be \c USER or \c SYSTEM for user specific or system wide
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preferences
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\param[in] vendor unique text describing the company or author of this file
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\param[in] application unique text describing the application
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*/
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\note On \b MSWindows, the directory is constructed by querying the <i>Common AppData</i>
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or <i>AppData</i> key of the <tt>Software\Microsoft\Windows\CurrentVersion\Explorer\Shell Folders</tt>
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registry entry. The filename and path is then constructed as <tt>$(query)/$(vendor)/$(application).prefs</tt> .
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If the query call fails, data will be stored in RAM only and be lost when the app exits.
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\par In FLTK versions before 1.4.0, if querying the registry failed, preferences would be written to
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<tt>C:\FLTK\$(vendor)\$(application).prefs</tt> .
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\note On \b Linux, the \c USER directory is constructed by reading \c $HOME . If \c $HOME is not set
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or not pointing to an existing directory, we are checking the path member of the passwd struct returned by
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\c getpwuid(getuid()) . If all attempts fail, data will be stored in RAM only and be lost when the app exits.
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The filename and path is then constructed as <tt>$(directory)/.fltk/$(vendor)/$(application).prefs</tt> .
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The \c SYSTEM directory is hardcoded as <tt>/etc/fltk/$(vendor)/$(application).prefs</tt> .
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\par In FLTK versions before 1.4.0, if \c $HOME was not set, the \c USER path would be empty,
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generating <tt>$(vendor)/$(application).prefs</tt>, which was used relative the the current working directory.
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\note On \b MacOS, the \c USER directory is constructed by reading \c $HOME . If \c $HOME is not set
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or not pointing to an existing directory, we check the path returned by \c NSHomeDirectory() , and
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finally checking the path member of the passwd struct returned by \c getpwuid(getuid()) .
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If all attempts fail, data will be stored in RAM only and be lost when the app exits.
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The filename and path is then constructed as <tt>$(directory)/Library/Preferences/$(vendor)/$(application).prefs</tt> .
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The \c SYSTEM directory is hardcoded as <tt>/Library/Preferences/$(vendor)/$(application).prefs</tt> .
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\par In FLTK versions before 1.4.0, if \c $HOME was not set, the \c USER path would be \c NULL ,
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generating <tt>\<null\>/Library/Preferences/$(vendor)/$(application).prefs</tt>, which would silently fail to
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create a prefrences file.
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\param[in] root can be \c USER or \c SYSTEM for user specific or system wide preferences
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\param[in] vendor unique text describing the company or author of this file, must be a valid filepath segment
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\param[in] application unique text describing the application, must be a valid filepath segment
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\todo Before the release of 1.4.0, I want to make a failed attempt to write a preferences file smarter. I
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plan to use a subgroup of the "runtime" preferences to store data and stay accessable until the application
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exits. Data would be stored under <tt>./$(vendor)/$(application).prefs</tt> in RAM, but not on disk.
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\todo I want a way to access the type of the root preferences (SYSTEM, USER, MEMORY), and the state of
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the file access (OK, FILE_SYSTEM_FAIL, PERMISSION_FAIL, etc.), and probably the dirty() flag as well.
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\todo Also, I need to explain runtime preferences.
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\todo Lastly, I think I have to put short sample code in the Doxygen docs. The test app ist just not enough.
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*/
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Fl_Preferences::Fl_Preferences( Root root, const char *vendor, const char *application ) {
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node = new Node( "." );
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rootNode = new RootNode( this, root, vendor, application );
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@ -133,13 +171,12 @@ Fl_Preferences::Fl_Preferences( Root root, const char *vendor, const char *appli
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\brief Use this constructor to create or read a preferences file at an
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arbitrary position in the file system.
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The file name is generated in the form
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<tt><i>path</i>/<i>application</i>.prefs</tt>. If \p application
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is \c NULL, \p path must contain the full file name.
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The file name is generated in the form <tt>$(path)/$(application).prefs</tt>.
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If \p application is \c NULL, \p path is taken literally as the file path and name.
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\param[in] path path to the directory that contains the preferences file
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\param[in] vendor unique text describing the company or author of this file
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\param[in] application unique text describing the application
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\param[in] vendor unique text describing the company or author of this file, must be a valid filepath segment
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\param[in] application unique text describing the application, must be a valid filepath segment
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*/
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Fl_Preferences::Fl_Preferences( const char *path, const char *vendor, const char *application ) {
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node = new Node( "." );
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