1Palm::StdAppInfo(3) User Contributed Perl Documentation Palm::StdAppInfo(3)
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6 Palm::StdAppInfo - Handle standard AppInfo blocks in Palm OS PDBs
7
9 This document describes version 1.400 of Palm::StdAppInfo, released
10 March 14, 2015 as part of Palm version 1.400.
11
13 Usually:
14 package MyPDBHandler;
16 use Palm::StdAppInfo(); # Note the parentheses
17 @ISA = qw( Palm::StdAppInfo );
19 use constant APPINFO_PADDING = 1;
21 sub ParseAppInfoBlock {
23 my $self = shift;
24 my $data = shift;
25 my $appinfo = {};
26 &Palm::StdAppInfo::parse_StdAppInfo($appinfo, $data);
28 $app_specific_data = $appinfo->{other};
30 }
31 sub PackAppInfoBlock {
33 my $self = shift;
34 my $retval;
35 $self->{appinfo}{other} = <pack application-specific data>;
37 $retval = &Palm::StdAppInfo::pack_StdAppInfo($self->{appinfo});
38 return $retval;
39 }
40 Or as a standalone "PDB" helper class:
42 use Palm::StdAppInfo;
44
46 Many Palm applications use a common format for keeping track of
47 categories. The "Palm::StdAppInfo" class deals with this common
48 format:
49 $pdb = new Palm::PDB;
51 $pdb->Load("myfile.pdb");
52 @categories = @{ $pdb->{appinfo}{categories} };
54 $lastUniqueID = $pdb->{appinfo}{lastUniqueID};
55 $other = $pdb->{appinfo}{other};
56 where:
58 @categories is an array of references-to-hash:
60 "$cat = $categories[0];"
62 "$cat->{name}"
63 The name of the category, a string of at most 16 characters.
64 "$cat->{id}"
66 The category ID, an integer in the range 0-255. Each category has a
67 unique ID. By convention, 0 is reserved for the "Unfiled" category;
68 IDs assigned by the Palm are in the range 1-127, and IDs assigned
69 by the desktop are in the range 128-255.
70 "$cat->{renamed}"
72 A boolean. This field is true iff the category has been renamed
73 since the last sync.
74 $lastUniqueID is (I think) the last category ID that was assigned.
76 $other is any data that follows the category list in the AppInfo block.
78 If you're writing a helper class for a PDB that includes a category
79 list, you should parse this field to get any data that follows the
80 category list; you should also make sure that this field is initialized
81 before you call &Palm::StdAppInfo::pack_AppInfo.
82 APPINFO_PADDING
84 Normally, the AppInfo block includes a byte of padding at the end, to
85 bring its length to an even number. However, some databases use this
86 byte for data.
87 If your database uses the padding byte for data, then your
89 &ParseAppInfoBlock method (see "SYNOPSIS") should call
90 &parse_StdAppInfo with a true $nopadding argument.
91 If, for whatever reason, you wish to inherit
93 &StdAppInfo::ParseAppInfoBlock, then add
94 use constant APPINFO_PADDING => 0;
96 to your handler package, to tell it that the padding byte is really
98 data.
99
101 seed_StdAppInfo
102 &Palm::StdAppInfo::seed_StdAppInfo(\%appinfo);
103 Creates the standard fields in an existing AppInfo hash. Usually used
105 to ensure that a newly-created AppInfo block contains an initialized
106 category array:
107 my $appinfo = {};
109 &Palm::StdAppInfo::seed_StdAppInfo($appinfo);
111 Note: this is not a method.
113 newStdAppInfo
115 $appinfo = Palm::StdAppInfo->newStdAppInfo;
116 Like "seed_StdAppInfo", but creates an AppInfo hash and returns a
118 reference to it.
119 new
121 $pdb = new Palm::StdAppInfo;
122 Create a new PDB, initialized with nothing but a standard AppInfo
124 block.
125 There are very few reasons to use this, and even fewer good ones. If
127 you're writing a helper class to parse some PDB format that contains a
128 category list, then you should make that helper class a subclass of
129 "Palm::StdAppInfo".
130 parse_StdAppInfo
132 $len = &Palm::StdAppInfo::parse_StdAppInfo(\%appinfo, $data, $nopadding);
133 This function (this is not a method) is intended to be called from
135 within a PDB helper class's "ParseAppInfoBlock" method.
136 "parse_StdAppInfo()" parses a standard AppInfo block from the raw data
138 $data and fills in the fields in %appinfo. It returns the number of
139 bytes parsed.
140 $nopadding is optional, and defaults to false. Normally, the AppInfo
142 block includes a padding byte at the end. If $nopadding is true, then
143 &parse_StdAppInfo assumes that the padding byte is application data,
144 and includes it in $appinfo{'other'}, so that the caller can parse it.
145 ParseAppInfoBlock
147 $pdb = new Palm::StdAppInfo;
148 $pdb->ParseAppInfoBlock($data);
149 If your application's AppInfo block contains standard category support
151 and nothing else, you may choose to just inherit this method instead of
152 writing your own "ParseAppInfoBlock" method. Otherwise, see the example
153 in "SYNOPSIS".
154 pack_StdAppInfo
156 $data = &Palm::StdAppInfo::pack_StdAppInfo(\%appinfo);
157 This function (this is not a method) is intended to be called from
159 within a PDB helper class's "PackAppInfoBlock" method.
160 "pack_StdAppInfo" takes an AppInfo hash and packs it as a string of raw
162 data that can be written to a PDB.
163 Note that if you're using this inside a helper class's
165 "PackAppInfoBlock" method, you should make sure that $appinfo{other} is
166 properly initialized before you call
167 &Palm::StdAppInfo::pack_StdAppInfo.
168 $nopadding is optional, and defaults to false. Normally, the AppInfo
170 block includes a byte of padding at the end. If $nopadding is true,
171 then &pack_StdAppInfo doesn't include this byte of padding, so that the
172 application can use it.
173 PackAppInfoBlock
175 $pdb = new Palm::StdAppInfo;
176 $data = $pdb->PackAppInfoBlock();
177 If your application's AppInfo block contains standard category support
179 and nothing else, you may choose to just inherit this method instead of
180 writing your own "PackAppInfoBlock" method. Otherwise, see the example
181 in "SYNOPSIS".
182 addCategory
184 $pdb->addCategory($name [, $id [, $renamed]]);
185 Adds a category to $pdb.
187 The $name argument specifies the new category's name.
189 The optional $id argument specifies the new category's numeric ID; if
191 omitted or undefined, &addCategory will pick one.
192 The optional $renamed argument is a boolean value indicating whether
194 the new category should be marked as having been modified. This
195 defaults to true since, conceptually, &addCategory doesn't really add a
196 category: it finds one whose name happens to be empty, and renames it.
197 Returns a true value if successful, false otherwise. In case of
199 failure, &addCategory sets $Palm::StdAppInfo::error to an error
200 message.
201 deleteCategory
203 $pdb->deleteCategory($name);
204 Deletes the category with name $name. Actually, though, it doesn't
206 delete the category: it just changes its name to the empty string, and
207 marks the category as renamed.
208 renameCategory
210 $pdb->renameCategory($oldname, $newname);
211 Renames the category named $oldname to $newname.
213 If successful, returns a true value. If there is no category named
215 $oldname, returns a false value and sets $Palm::StdAppInfo::error to an
216 error message.
217
219 Palm::PDB
220
222 Palm::StdAppInfo requires no configuration files or environment
223 variables.
224
226 None reported.
227
229 No bugs have been reported.
230
232 Andrew Arensburger "<arensb AT ooblick.com>"
233 Currently maintained by Christopher J. Madsen "<perl AT cjmweb.net>"
235 Please report any bugs or feature requests to
237 "<bug-Palm AT rt.cpan.org>" or through the web interface at
238 <http://rt.cpan.org/Public/Bug/Report.html?Queue=Palm>.
239 You can follow or contribute to p5-Palm's development at
241 <https://github.com/madsen/p5-Palm>.
242
244 This software is copyright (c) 2003 by Andrew Arensburger & Alessandro
245 Zummo.
246 This is free software; you can redistribute it and/or modify it under
248 the same terms as the Perl 5 programming language system itself.
249
251 BECAUSE THIS SOFTWARE IS LICENSED FREE OF CHARGE, THERE IS NO WARRANTY
252 FOR THE SOFTWARE, TO THE EXTENT PERMITTED BY APPLICABLE LAW. EXCEPT
253 WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR OTHER
254 PARTIES PROVIDE THE SOFTWARE "AS IS" WITHOUT WARRANTY OF ANY KIND,
255 EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
256 WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. THE
257 ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE SOFTWARE IS WITH
258 YOU. SHOULD THE SOFTWARE PROVE DEFECTIVE, YOU ASSUME THE COST OF ALL
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262 WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MAY MODIFY AND/OR
263 REDISTRIBUTE THE SOFTWARE AS PERMITTED BY THE ABOVE LICENSE, BE LIABLE
264 TO YOU FOR DAMAGES, INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL, OR
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271perl v5.30.0 2019-07-26 Palm::StdAppInfo(3)