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1 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
2 %% Name: xmldocument.tex
3 %% Purpose: wxXmlDocument documentation
4 %% Author: Francesco Montorsi
5 %% Created: 2006-04-18
6 %% RCS-ID: $Id$
7 %% Copyright: (c) 2006 Francesco Montorsi
8 %% License: wxWindows license
9 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
10
11 \section{\class{wxXmlDocument}}\label{wxxmldocument}
12
13 This class holds XML data/document as parsed by XML parser in the root node.
14
15 wxXmlDocument internally uses the expat library which comes with wxWidgets to parse the given stream.
16
17 A simple example of using XML classes is:
18
19 \begin{verbatim}
20 wxXmlDocument doc;
21 if (!doc.Load(wxT("myfile.xml")))
22 return false;
23
24 // start processing the XML file
25 if (doc.GetRoot()->GetName() != wxT("myroot-node"))
26 return false;
27
28 wxXmlNode *child = doc.GetRoot()->GetChildren();
29 while (child) {
30
31 if (child->GetName() == wxT("tag1")) {
32
33 // process text enclosed by <tag1></tag1>
34 wxString content = child->GetNodeContent();
35
36 ...
37
38
39 // process attributes of <tag1>
40 wxString attrvalue1 =
41 child->GetAttribute(wxT("attr1"),
42 wxT("default-value"));
43 wxString attrvalue2 =
44 child->GetAttribute(wxT("attr2"),
45 wxT("default-value"));
46
47 ...
48
49 } else if (child->GetName() == wxT("tag2")) {
50
51 // process tag2 ...
52 }
53
54 child = child->GetNext();
55 }
56 \end{verbatim}
57
58 {\bf Note:} if you want to preserve the original formatting of the loaded file including whitespaces
59 and indentation, you need to turn off whitespace-only textnode removal and automatic indentation:
60
61 \begin{verbatim}
62 wxXmlDocument doc;
63 doc.Load(wxT("myfile.xml"), wxT("UTF-8"), wxXMLDOC_KEEP_WHITESPACE_NODES);
64
65 // myfile2.xml will be indentic to myfile.xml saving it this way:
66 doc.Save(wxT("myfile2.xml"), wxXML_NO_INDENTATION);
67 \end{verbatim}
68
69 Using default parameters, you will get a reformatted document which in general is different from
70 the original loaded content:
71
72 \begin{verbatim}
73 wxXmlDocument doc;
74 doc.Load(wxT("myfile.xml"));
75 doc.Save(wxT("myfile2.xml")); // myfile2.xml != myfile.xml
76 \end{verbatim}
77
78
79 \wxheading{Derived from}
80
81 \helpref{wxObject}{wxobject}
82
83 \wxheading{Include files}
84
85 <wx/xml/xml.h>
86
87 \wxheading{Library}
88
89 \helpref{wxXml}{librarieslist}
90
91 \wxheading{See also}
92
93 \helpref{wxXmlNode}{wxxmlnode}, \helpref{wxXmlAttribute}{wxxmlattribute}
94
95
96 \latexignore{\rtfignore{\wxheading{Members}}}
97
98
99
100 \membersection{wxXmlDocument::wxXmlDocument}\label{wxxmldocumentwxxmldocument}
101
102 \func{}{wxXmlDocument}{\void}
103
104
105 \func{}{wxXmlDocument}{\param{const wxString\& }{filename}, \param{const wxString\& }{encoding = wxT("UTF-8")}, \param{int }{flags = wxXMLDOC\_NONE}}
106
107 Loads the given {\it filename} using the given encoding. See \helpref{Load}{wxxmldocumentload}.
108
109 \func{}{wxXmlDocument}{\param{wxInputStream\& }{stream}, \param{const wxString\& }{encoding = wxT("UTF-8")}, \param{int }{flags = wxXMLDOC\_NONE}}
110
111 Loads the XML document from given stream using the given encoding. See \helpref{Load}{wxxmldocumentload}.
112
113 \func{}{wxXmlDocument}{\param{const wxXmlDocument\& }{doc}}
114
115 Copy constructor. Deep copies all the XML tree of the given document.
116
117
118 \membersection{wxXmlDocument::\destruct{wxXmlDocument}}\label{wxxmldocumentdtor}
119
120 \func{}{\destruct{wxXmlDocument}}{\void}
121
122 Virtual destructor. Frees the document root node.
123
124
125
126 \membersection{wxXmlDocument::DetachRoot}\label{wxxmldocumentdetachroot}
127
128 \func{wxXmlNode*}{DetachRoot}{\void}
129
130 Detaches the document root node and returns it. The document root node will be set to \NULL
131 and thus \helpref{IsOk}{wxxmldocumentisok} will return \false after calling this function.
132
133 Note that the caller is reponsible for deleting the returned node in order to avoid memory leaks.
134
135
136
137 \membersection{wxXmlDocument::GetEncoding}\label{wxxmldocumentgetencoding}
138
139 \constfunc{wxString}{GetEncoding}{\void}
140
141 Returns encoding of in-memory representation of the document
142 (same as passed to \helpref{Load}{wxxmldocumentload} or constructor, defaults to UTF-8).
143
144 NB: this is meaningless in Unicode build where data are stored as {\tt wchar\_t*}.
145
146
147
148 \membersection{wxXmlDocument::GetFileEncoding}\label{wxxmldocumentgetfileencoding}
149
150 \constfunc{wxString}{GetFileEncoding}{\void}
151
152 Returns encoding of document (may be empty).
153
154 Note: this is the encoding original file was saved in, {\bf not} the
155 encoding of in-memory representation!
156
157
158
159 \membersection{wxXmlDocument::GetRoot}\label{wxxmldocumentgetroot}
160
161 \constfunc{wxXmlNode*}{GetRoot}{\void}
162
163 Returns the root node of the document.
164
165
166
167 \membersection{wxXmlDocument::GetVersion}\label{wxxmldocumentgetversion}
168
169 \constfunc{wxString}{GetVersion}{\void}
170
171 Returns the version of document.
172 This is the value in the {\tt <?xml version="1.0"?>} header of the XML document.
173 If the version attribute was not explicitely given in the header, this function
174 returns an empty string.
175
176
177
178 \membersection{wxXmlDocument::IsOk}\label{wxxmldocumentisok}
179
180 \constfunc{bool}{IsOk}{\void}
181
182 Returns \true if the document has been loaded successfully.
183
184
185
186 \membersection{wxXmlDocument::Load}\label{wxxmldocumentload}
187
188 \func{bool}{Load}{\param{const wxString\& }{filename}, \param{const wxString\& }{encoding = wxT("UTF-8")}, \param{int }{flags = wxXMLDOC\_NONE}}
189
190 Parses {\it filename} as an xml document and loads its data.
191
192 If {\tt flags} does not contain {\tt wxXMLDOC\_KEEP\_WHITESPACE\_NODES}, then, while loading, all nodes of
193 type {\tt wxXML\_TEXT\_NODE} (see \helpref{wxXmlNode}{wxxmlnode}) are automatically skipped if they
194 contain whitespaces only.
195 The removal of these nodes makes the load process slightly faster and requires less memory however
196 makes impossible to recreate exactly the loaded text with a \helpref{Save}{wxxmldocumentsave} call later.
197 Read the initial description of this class for more info.
198
199 Returns \true on success, \false otherwise.
200
201 \func{bool}{Load}{\param{wxInputStream\& }{stream}, \param{const wxString\& }{encoding = wxT("UTF-8")}, \param{int }{flags = wxXMLDOC\_NONE}}
202
203 Like above but takes the data from given input stream.
204
205
206 \membersection{wxXmlDocument::Save}\label{wxxmldocumentsave}
207
208 \constfunc{bool}{Save}{\param{const wxString\& }{filename}, \param{int }{indentstep = 1}}
209
210 Saves XML tree creating a file named with given string.
211
212 If {\tt indentstep} is greater than or equal to zero, then, while saving, an automatic indentation
213 is added with steps composed by {\tt indentstep} spaces.
214 If {\tt indentstep} is {\tt wxXML\_NO\_INDENTATION}, then, automatic indentation is turned off.
215
216 \constfunc{bool}{Save}{\param{wxOutputStream\& }{stream}, \param{int }{indentstep = 1}}
217
218 Saves XML tree in the given output stream. See other overload for a description of {\tt indentstep}.
219
220
221 \membersection{wxXmlDocument::SetEncoding}\label{wxxmldocumentsetencoding}
222
223 \func{void}{SetEncoding}{\param{const wxString\& }{enc}}
224
225 Sets the enconding of the document.
226
227
228 \membersection{wxXmlDocument::SetFileEncoding}\label{wxxmldocumentsetfileencoding}
229
230 \func{void}{SetFileEncoding}{\param{const wxString\& }{encoding}}
231
232 Sets the enconding of the file which will be used to save the document.
233
234
235 \membersection{wxXmlDocument::SetRoot}\label{wxxmldocumentsetroot}
236
237 \func{void}{SetRoot}{\param{wxXmlNode* }{node}}
238
239 Sets the root node of this document. Deletes previous root node.
240 Use \helpref{DetachRoot}{wxxmldocumentdetachroot} and then
241 \helpref{SetRoot}{wxxmldocumentsetroot} if you want
242 to replace the root node without deleting the old document tree.
243
244
245 \membersection{wxXmlDocument::SetVersion}\label{wxxmldocumentsetversion}
246
247 \func{void}{SetVersion}{\param{const wxString\& }{version}}
248
249 Sets the version of the XML file which will be used to save the document.
250
251
252 \membersection{wxXmlDocument::operator=}\label{wxxmldocumentoperatorassign}
253
254 \func{wxXmlDocument\& operator}{operator=}{\param{const wxXmlDocument\& }{doc}}
255
256 Deep copies the given document.
257