docs/latex/wx/xmldocument.tex

   1 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
   2 %% Name:        xmlnode.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 properties of <tag1>
  40         wxString propvalue1 = child->GetPropVal(wxT("prop1"), wxT("default-value"));
  41         wxString propvalue2 = child->GetPropVal(wxT("prop2"), wxT("default-value"));
  42
  43         ...
  44
  45     } else if (child->GetName() == wxT("tag2")) {
  46
  47         // process tag2 ...
  48     }
  49
  50     child = child->GetNext();
  51 }
  52 \end{verbatim}
  53
  54 {\bf Note:} if you want to preserve the original formatting of the loaded file including whitespaces
  55 and indentation, you need to turn off whitespace-only textnode removal and automatic indentation:
  56
  57 \begin{verbatim}
  58 wxXmlDocument doc;
  59 doc.Load(wxT("myfile.xml"), wxT("UTF-8"), wxXMLDOC_KEEP_WHITESPACE_NODES);
  60 doc.Save(wxT("myfile2.xml"), wxXML_NO_INDENTATION);       // myfile2.xml will be indentic to myfile.xml
  61 \end{verbatim}
  62
  63 Using default parameters, you will get a reformatted document which in general is different from
  64 the original loaded content:
  65
  66 \begin{verbatim}
  67 wxXmlDocument doc;
  68 doc.Load(wxT("myfile.xml"));
  69 doc.Save(wxT("myfile2.xml"));       // myfile2.xml != myfile.xml
  70 \end{verbatim}
  71
  72
  73 \wxheading{Derived from}
  74
  75 \helpref{wxObject}{wxobject}
  76
  77 \wxheading{Include files}
  78
  79 <wx/xml/xml.h>
  80
  81 \wxheading{See also}
  82
  83 \helpref{wxXmlNode}{wxxmlnode}, \helpref{wxXmlProperty}{wxxmlproperty}
  84
  85
  86 \latexignore{\rtfignore{\wxheading{Members}}}
  87
  88
  89 \membersection{wxXmlDocument::wxXmlDocument}\label{wxxmldocumentwxxmldocument}
  90
  91 \func{}{wxXmlDocument}{\void}
  92
  93
  94 \func{}{wxXmlDocument}{\param{const wxString\& }{filename}, \param{const wxString\& }{encoding = wxT("UTF-8")}, \param{int }{flags = wxXMLDOC_NONE}}
  95
  96 Loads the given {\it filename} using the given encoding. See \helpref{Load()}{wxxmldocumentload}.
  97
  98 \func{}{wxXmlDocument}{\param{wxInputStream\& }{stream}, \param{const wxString\& }{encoding = wxT("UTF-8")}, \param{int }{flags = wxXMLDOC_NONE}}
  99
 100 Loads the XML document from given stream using the given encoding. See \helpref{Load()}{wxxmldocumentload}.
 101
 102 \func{}{wxXmlDocument}{\param{const wxXmlDocument\& }{doc}}
 103
 104 Copy constructor.
 105
 106 \membersection{wxXmlDocument::\destruct{wxXmlDocument}}\label{wxxmldocumentdtor}
 107
 108 \func{}{\destruct{wxXmlDocument}}{\void}
 109
 110 Virtual destructor. Frees the document root node.
 111
 112
 113 \membersection{wxXmlDocument::DetachRoot}\label{wxxmldocumentdetachroot}
 114
 115 \func{wxXmlNode*}{DetachRoot}{\void}
 116
 117 Detaches the document root node and returns it. The document root node will be set to \NULL
 118 and thus \helpref{IsOk}{wxxmldocumentisok} will return \false after calling this function.
 119
 120 Note that the caller is reponsible for deleting the returned node in order to avoid memory leaks.
 121
 122
 123 \membersection{wxXmlDocument::GetEncoding}\label{wxxmldocumentgetencoding}
 124
 125 \constfunc{wxString}{GetEncoding}{\void}
 126
 127 Returns encoding of in-memory representation of the document
 128 (same as passed to \helpref{Load()}{wxxmldocumentload} or constructor, defaults to UTF-8).
 129
 130 NB: this is meaningless in Unicode build where data are stored as wchar\_t*.
 131
 132
 133 \membersection{wxXmlDocument::GetFileEncoding}\label{wxxmldocumentgetfileencoding}
 134
 135 \constfunc{wxString}{GetFileEncoding}{\void}
 136
 137 Returns encoding of document (may be empty).
 138
 139 Note: this is the encoding original file was saved in, *not* the
 140 encoding of in-memory representation!
 141
 142
 143 \membersection{wxXmlDocument::GetRoot}\label{wxxmldocumentgetroot}
 144
 145 \constfunc{wxXmlNode*}{GetRoot}{\void}
 146
 147 Returns the root node of the document.
 148
 149
 150 \membersection{wxXmlDocument::GetVersion}\label{wxxmldocumentgetversion}
 151
 152 \constfunc{wxString}{GetVersion}{\void}
 153
 154 Returns the version of document.
 155 This is the value in the {\tt <?xml version="1.0"?>} header of the XML document.
 156 If the version property was not explicitely given in the header, this function
 157 returns an empty string.
 158
 159
 160 \membersection{wxXmlDocument::IsOk}\label{wxxmldocumentisok}
 161
 162 \constfunc{bool}{IsOk}{\void}
 163
 164 Returns \true if the document has been loaded successfully.
 165
 166
 167 \membersection{wxXmlDocument::Load}\label{wxxmldocumentload}
 168
 169 \func{bool}{Load}{\param{const wxString\& }{filename}, \param{const wxString\& }{encoding = wxT("UTF-8")}, \param{int }{flags = wxXMLDOC_NONE}}
 170
 171 Parses {\it filename} as an xml document and loads its data.
 172
 173 If {\tt flags} does not contain {\tt wxXMLDOC_KEEP_WHITESPACE_NODES}, then, while loading, all nodes of
 174 type {\tt wxXML_TEXT_NODE} (see \helpref{wxXmlNode}{wxxmlnode}) are automatically skipped if they
 175 contain whitespaces only.
 176 The removal of these nodes makes the load process slightly faster and requires less memory however
 177 makes impossible to recreate exactly the loaded text with a \helpref{Save}{wxxmldocumentsave} call later.
 178 Read the initial description of this class for more info.
 179
 180 Returns \true on success, \false otherwise.
 181
 182 \func{bool}{Load}{\param{wxInputStream\& }{stream}, \param{const wxString\& }{encoding = wxT("UTF-8")}, \param{int }{flags = wxXMLDOC_NONE}}
 183
 184 Like above but takes the data from given input stream.
 185
 186 \membersection{wxXmlDocument::Save}\label{wxxmldocumentsave}
 187
 188 \constfunc{bool}{Save}{\param{const wxString\& }{filename}, \param{int }{indentstep = 1}}
 189
 190 Saves XML tree creating a file named with given string.
 191
 192 If {\tt indentstep} is greater than or equal to zero, then, while saving, an automatic indentation
 193 is added with steps composed by {\tt indentstep} spaces.
 194 If {\tt indentstep} is {\tt wxXML_NO_INDENTATION}, then, automatic indentation is turned off.
 195
 196 \constfunc{bool}{Save}{\param{wxOutputStream\& }{stream}, \param{int }{indentstep = 1}}
 197
 198 Saves XML tree in the given output stream. See other overload for a description of {\tt indentstep}.
 199
 200 \membersection{wxXmlDocument::SetEncoding}\label{wxxmldocumentsetencoding}
 201
 202 \func{void}{SetEncoding}{\param{const wxString\& }{enc}}
 203
 204 Sets the enconding of the document.
 205
 206 \membersection{wxXmlDocument::SetFileEncoding}\label{wxxmldocumentsetfileencoding}
 207
 208 \func{void}{SetFileEncoding}{\param{const wxString\& }{encoding}}
 209
 210 Sets the enconding of the file which will be used to save the document.
 211
 212 \membersection{wxXmlDocument::SetRoot}\label{wxxmldocumentsetroot}
 213
 214 \func{void}{SetRoot}{\param{wxXmlNode* }{node}}
 215
 216 Sets the root node of this document. Deletes previous root node.
 217 Use \helpref{DetachRoot}{wxxmlnodedetachroot} and then SetRoot if you want to
 218 replace the root node without deleting the old document tree.
 219
 220 \membersection{wxXmlDocument::SetVersion}\label{wxxmldocumentsetversion}
 221
 222 \func{void}{SetVersion}{\param{const wxString\& }{version}}
 223
 224 Sets the version of the XML file which will be used to save the document.
 225
 226 \membersection{wxXmlDocument::operator=}\label{wxxmldocumentoperatorassign}
 227
 228 \func{wxXmlDocument\& operator}{operator=}{\param{const wxXmlDocument\& }{doc}}
 229
 230 Copies the given document.
 231