-% automatically generated by HelpGen from textfile.tex at 10/Jan/99 18:47:37
\section{\class{wxTextFile}}\label{wxtextfile}
The wxTextFile is a simple class which allows to work with text files on line by
line basis. It also understands the differences in line termination characters
under different platforms and will not do anything bad to files with "non
native" line termination sequences - in fact, it can be also used to modify the
-text files and chaneg the line termination characters from one type (say DOS) to
+text files and change the line termination characters from one type (say DOS) to
another (say Unix).
-One word of warning: the class is not at all optimized for big files and so it
-will load the file entirely into memory when opened. Of course, you should not
+One word of warning: the class is not at all optimized for big files and thus
+it will load the file entirely into memory when opened. Of course, you should not
work in this way with large files (as an estimation, anything over 1 Megabyte is
surely too big for this class). On the other hand, it is not a serious
-limitation for the small files like configuration files or programs sources
+limitation for small files like configuration files or program sources
which are well handled by wxTextFile.
The typical things you may do with wxTextFile in order are:
+
\begin{itemize}\itemsep=0pt
-\item Create and open it: this is done with \helpref{Open}{wxtextfileopen}
-function which opens the file (name may be specified either as Open argument or
-in the constructor), reads its contents in memory and closes it. If all of these
-operations are successful, Open() will return TRUE and FALSE on error.
+\item Create and open it: this is done with either
+\helpref{Create}{wxtextfilecreate} or \helpref{Open}{wxtextfileopen}
+function which opens the file (name may be specified either as the argument to
+these functions or in the constructor), reads its contents in memory (in the
+case of {\tt Open()}) and closes it.
\item Work with the lines in the file: this may be done either with "direct
-access" functions like \helpref{GetLineCount}{wxtextfilegetlinecount} and
+access" functions like \helpref{GetLineCount}{wxtextfilegetlinecount} and
\helpref{GetLine}{wxtextfilegetline} ({\it operator[]} does exactly the same
but looks more like array addressing) or with "sequential access" functions
which include \helpref{GetFirstLine}{wxtextfilegetfirstline}/
\helpref{GetNextLine}{wxtextfilegetnextline} and also
-\helpref{GetLastLine}{getlastline}/\helpref{GetPrevLine}{wxtextfilegetprevline}.
+\helpref{GetLastLine}{wxtextfilegetlastline}/\helpref{GetPrevLine}{wxtextfilegetprevline}.
For the sequential access functions the current line number is maintained: it is
returned by \helpref{GetCurrentLine}{wxtextfilegetcurrentline} and may be
changed with \helpref{GoToLine}{wxtextfilegotoline}.
\item Add/remove lines to the file: \helpref{AddLine}{wxtextfileaddline} and
\helpref{InsertLine}{wxtextfileinsertline} add new lines while
\helpref{RemoveLine}{wxtextfileremoveline} deletes the existing ones.
-\item Save your changes: notice that the changes you do to the file will {\bf
-not} be saved automatically, calling \helpref{Close}{wxtextfileclose} or doing
-nothing discards them! To save the chanegs you must explicitly call
+\helpref{Clear}{wxtextfileclear} resets the file to empty.
+\item Save your changes: notice that the changes you make to the file will {\bf
+not} be saved automatically; calling \helpref{Close}{wxtextfileclose} or doing
+nothing discards them! To save the changes you must explicitly call
\helpref{Write}{wxtextfilewrite} - here, you may also change the line
termination type if you wish.
\end{itemize}
-\wxheading{See also:}
-
-\helpref{wxFile}{wxfile}
-
\wxheading{Derived from}
No base class
+\wxheading{Include files}
+
+<wx/textfile.h>
+
\wxheading{Data structures}
The following constants identify the line termination type:
+
\begin{verbatim}
enum wxTextFileType
{
wxTextFileType_Unix, // line is terminated with 'LF' = 0xA = 10 = '\n'
wxTextFileType_Dos, // 'CR' 'LF'
wxTextFileType_Mac // 'CR' = 0xD = 13 = '\r'
-}
+};
\end{verbatim}
+\wxheading{See also}
+
+\helpref{wxFile}{wxfile}
+
\latexignore{\rtfignore{\wxheading{Members}}}
\membersection{wxTextFile::wxTextFile}\label{wxtextfilectordef}
+
\constfunc{}{wxTextFile}{\void}
-Default constructor, use Open(string) to initialize the object.
+Default constructor, use \helpref{Create}{wxtextfilecreate} or
+\helpref{Open}{wxtextfileopen} with a file name parameter to initialize the object.
\membersection{wxTextFile::wxTextFile}\label{wxtextfilector}
+
\constfunc{}{wxTextFile}{\param{const wxString\& }{strFile}}
Constructor does not load the file into memory, use Open() to do it.
-\membersection{wxTextFile::Exists}\label{wxtextfileexists}
-\constfunc{bool}{Exists}{\void}
+\membersection{wxTextFile::\destruct{wxTextFile}}\label{wxtextfiledtor}
-Return TRUE if file exists - the name of the file should have been specified
-in the constructor before calling Exists().
+\constfunc{}{\destruct{wxTextFile}}{\void}
-\membersection{wxTextFile::Open}\label{wxtextfileopen}
-\constfunc{bool}{Open}{\void}
+Destructor does nothing.
-Open() opens the file with the name which was given in the \helpref{constructor}{wxtextfilector}
-and also loads file in memory on success.
+\membersection{wxTextFile::AddLine}\label{wxtextfileaddline}
-\membersection{wxTextFile::Open}\label{wxtextfileopenname}
-\constfunc{bool}{Open}{\param{const wxString\& }{strFile}}
+\constfunc{void}{AddLine}{\param{const wxString\& }{str}, \param{wxTextFileType }{type = typeDefault}}
-Same as \helpref{Open()}{wxtextfileopen} but allows to specify the file name
-(must be used if the default constructor was used to create the object).
+Adds a line to the end of file.
\membersection{wxTextFile::Close}\label{wxtextfileclose}
+
\constfunc{bool}{Close}{\void}
Closes the file and frees memory, {\bf losing all changes}. Use \helpref{Write()}{wxtextfilewrite}
if you want to save them.
+\membersection{wxTextFile::Create}\label{wxtextfilecreate}
+
+\constfunc{bool}{Create}{\void}
+
+\constfunc{bool}{Create}{\param{const wxString\& }{strFile}}
+
+Creates the file with the given name or the name which was given in the
+\helpref{constructor}{wxtextfilector}. The array of file lines is initially
+empty.
+
+It will fail if the file already exists, \helpref{Open}{wxtextfileopen} should
+be used in this case.
+
+\membersection{wxTextFile::Exists}\label{wxtextfileexists}
+
+\constfunc{bool}{Exists}{\void}
+
+Return true if file exists - the name of the file should have been specified
+in the constructor before calling Exists().
+
\membersection{wxTextFile::IsOpened}\label{wxtextfileisopened}
+
\constfunc{bool}{IsOpened}{\void}
-Returns TRUE if the file is currently opened.
+Returns true if the file is currently opened.
\membersection{wxTextFile::GetLineCount}\label{wxtextfilegetlinecount}
+
\constfunc{size\_t}{GetLineCount}{\void}
Get the number of lines in the file.
\membersection{wxTextFile::GetLine}\label{wxtextfilegetline}
+
\constfunc{wxString\&}{GetLine}{\param{size\_t }{n}}
Retrieves the line number {\it n} from the file. The returned line may be
modified but you shouldn't add line terminator at the end - this will be done
by wxTextFile.
-\membersection{wxTextFile::operator[]}\label{wxtextfileoperator[]}
+\membersection{wxTextFile::operator[]}\label{wxtextfileoperatorarray}
+
\constfunc{wxString\&}{operator[]}{\param{size\_t }{n}}
The same as \helpref{GetLine}{wxtextfilegetline}.
\membersection{wxTextFile::GetCurrentLine}\label{wxtextfilegetcurrentline}
+
\constfunc{size\_t}{GetCurrentLine}{\void}
Returns the current line: it has meaning only when you're using
GoToLine().
\membersection{wxTextFile::GoToLine}\label{wxtextfilegotoline}
+
\constfunc{void}{GoToLine}{\param{size\_t }{n}}
Changes the value returned by \helpref{GetCurrentLine}{wxtextfilegetcurrentline}
-and used by \helpref{GetFirstLine()}{wxtextfilegetfirstline}()/\helpref{GetNextLine()}{wxtextfilegetnextline}.
+and used by \helpref{GetFirstLine()}{wxtextfilegetfirstline}/\helpref{GetNextLine()}{wxtextfilegetnextline}.
\membersection{wxTextFile::Eof}\label{wxtextfileeof}
+
\constfunc{bool}{Eof}{\void}
-Returns TRUE if the current line is the last one.
+Returns true if the current line is the last one.
+
+\membersection{wxTextFile::GetEOL}\label{wxtextfilegeteol}
+
+\constfunc{static const char*}{GetEOL}{\param{wxTextFileType }{type = typeDefault}}
+
+Get the line termination string corresponding to given constant. {\it typeDefault} is
+the value defined during the compilation and corresponds to the native format
+of the platform, i.e. it will be wxTextFileType\_Dos under Windows,
+wxTextFileType\_Unix under Unix (including Mac OS X when compiling with the
+Apple Developer Tools) and wxTextFileType\_Mac under Mac OS (including
+Mac OS X when compiling with CodeWarrior).
\membersection{wxTextFile::GetFirstLine}\label{wxtextfilegetfirstline}
+
\constfunc{wxString\&}{GetFirstLine}{\void}
This method together with \helpref{GetNextLine()}{wxtextfilegetnextline}
write something like:
\begin{verbatim}
-for ( str = GetFirstLine(); !Eof(); str = GetNextLine() )
+wxTextFile file;
+...
+for ( str = file.GetFirstLine(); !file.Eof(); str = file.GetNextLine() )
{
// do something with the current line in str
}
+// do something with the last line in str
\end{verbatim}
\membersection{wxTextFile::GetNextLine}\label{wxtextfilegetnextline}
+
\func{wxString\&}{GetNextLine}{\void}
Gets the next line (see \helpref{GetFirstLine}{wxtextfilegetfirstline} for
the example).
\membersection{wxTextFile::GetPrevLine}\label{wxtextfilegetprevline}
+
\func{wxString\&}{GetPrevLine}{\void}
Gets the previous line in the file.
\membersection{wxTextFile::GetLastLine}\label{wxtextfilegetlastline}
+
\func{wxString\&}{GetLastLine}{\void}
-Gets the last line of the file.
+Gets the last line of the file. Together with
+\helpref{GetPrevLine}{wxtextfilegetprevline} it allows to enumerate the lines
+in the file from the end to the beginning like this:
+
+\begin{verbatim}
+wxTextFile file;
+...
+for ( str = file.GetLastLine();
+ file.GetCurrentLine() > 0;
+ str = file.GetPrevLine() )
+{
+ // do something with the current line in str
+}
+// do something with the first line in str
+\end{verbatim}
\membersection{wxTextFile::GetLineType}\label{wxtextfilegetlinetype}
+
\constfunc{wxTextFileType}{GetLineType}{\param{size\_t }{n}}
Get the type of the line (see also \helpref{GetEOL}{wxtextfilegeteol})
\membersection{wxTextFile::GuessType}\label{wxtextfileguesstype}
+
\constfunc{wxTextFileType}{GuessType}{\void}
Guess the type of file (which is supposed to be opened). If sufficiently
be returned. If the detection mechanism fails wxTextFileType\_None is returned.
\membersection{wxTextFile::GetName}\label{wxtextfilegetname}
+
\constfunc{const char*}{GetName}{\void}
Get the name of the file.
-\membersection{wxTextFile::AddLine}\label{wxtextfileaddline}
-\constfunc{void}{AddLine}{\param{const wxString\& }{str}, \param{wxTextFileType }{type = typeDefault}}
-
-Adds a line to the end of file.
-
\membersection{wxTextFile::InsertLine}\label{wxtextfileinsertline}
+
\constfunc{void}{InsertLine}{\param{const wxString\& }{str}, \param{size\_t }{n}, \param{wxTextFileType }{type = typeDefault}}
Insert a line before the line number {\it n}.
+\membersection{wxTextFile::Open}\label{wxtextfileopen}
+
+\constfunc{bool}{Open}{\param{wxMBConv\&}{ conv = wxConvUTF8}}
+
+\constfunc{bool}{Open}{\param{const wxString\& }{strFile}, \param{wxMBConv\&}{ conv = wxConvUTF8}}
+
+Open() opens the file with the given name or the name which was given in the
+\helpref{constructor}{wxtextfilector} and also loads file in memory on
+success. It will fail if the file does not exist,
+\helpref{Create}{wxtextfilecreate} should be used in this case.
+
+The {\it conv} argument is only meaningful in Unicode build of wxWidgets when
+it is used to convert the file to wide character representation.
+
\membersection{wxTextFile::RemoveLine}\label{wxtextfileremoveline}
+
\constfunc{void}{RemoveLine}{\param{size\_t }{n}}
-Delete one line from the file.
+Delete line number {\it n} from the file.
+
+\membersection{wxTextFile::Clear}\label{wxtextfileclear}
+
+\constfunc{void}{Clear}{\void}
+
+Delete all lines from the file, set current line number to 0.
\membersection{wxTextFile::Write}\label{wxtextfilewrite}
-\constfunc{bool}{Write}{\param{wxTextFileType }{typeNew = wxTextFileType\_None}}
-Change the file on disk. The {\it typeNew} parameter allows to change the
+\constfunc{bool}{Write}{\param{wxTextFileType }{typeNew = wxTextFileType\_None}, \param{wxMBConv\&}{ conv = wxConvUTF8}}
+
+Change the file on disk. The {\it typeNew} parameter allows you to change the
file format (default argument means "don't change type") and may be used to
convert, for example, DOS files to Unix.
-\membersection{wxTextFile::GetEOL}\label{wxtextfilegeteol}
-\constfunc{static const char*}{GetEOL}{\param{wxTextFileType }{type = typeDefault}}
-
-Get the line termination string corresponding to given constant. {\it typeDefault} is
-the value defined during the compilation and corresponds to the native format of the
-platform, i.e. it will be wxTextFileType\_Dos under Windows, wxTextFileType\_Unix under
-Unix and wxTextFileType\_Mac under Mac.
+The {\it conv} argument is only meaningful in Unicode build of wxWidgets when
+it is used to convert all lines to multibyte representation before writing them
+them to physical file.
-\membersection{wxTextFile::\destruct{wxTextFile}}\label{wxtextfiledtor}
-\constfunc{}{\destruct{wxTextFile}}{\void}
+Returns true if operation succeeded, false if it failed.
-Destructor does nothing.
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