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authorTimothy Pearson <kb9vqf@pearsoncomputing.net>2011-11-08 12:31:36 -0600
committerTimothy Pearson <kb9vqf@pearsoncomputing.net>2011-11-08 12:31:36 -0600
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+'\" t
+.TH QBuffer 3qt "2 February 2007" "Trolltech AS" \" -*- nroff -*-
+.\" Copyright 1992-2007 Trolltech ASA. All rights reserved. See the
+.\" license file included in the distribution for a complete license
+.\" statement.
+.\"
+.ad l
+.nh
+.SH NAME
+QBuffer \- I/O device that operates on a QByteArray
+.SH SYNOPSIS
+All the functions in this class are reentrant when Qt is built with thread support.</p>
+.PP
+\fC#include <qbuffer.h>\fR
+.PP
+Inherits QIODevice.
+.PP
+.SS "Public Members"
+.in +1c
+.ti -1c
+.BI "\fBQBuffer\fR ()"
+.br
+.ti -1c
+.BI "\fBQBuffer\fR ( QByteArray buf )"
+.br
+.ti -1c
+.BI "\fB~QBuffer\fR ()"
+.br
+.ti -1c
+.BI "QByteArray \fBbuffer\fR () const"
+.br
+.ti -1c
+.BI "bool \fBsetBuffer\fR ( QByteArray buf )"
+.br
+.ti -1c
+.BI "virtual Q_LONG \fBwriteBlock\fR ( const char * p, Q_ULONG len )"
+.br
+.ti -1c
+.BI "Q_LONG \fBwriteBlock\fR ( const QByteArray & data )"
+.br
+.in -1c
+.SH DESCRIPTION
+The QBuffer class is an I/O device that operates on a QByteArray.
+.PP
+QBuffer is used to read and write to a memory buffer. It is normally used with a QTextStream or a QDataStream. QBuffer has an associated QByteArray which holds the buffer data. The size() of the buffer is automatically adjusted as data is written.
+.PP
+The constructor \fCQBuffer(QByteArray)\fR creates a QBuffer using an existing byte array. The byte array can also be set with setBuffer(). Writing to the QBuffer will modify the original byte array because QByteArray is explicitly shared.
+.PP
+Use open() to open the buffer before use and to set the mode (read-only, write-only, etc.). close() closes the buffer. The buffer must be closed before reopening or calling setBuffer().
+.PP
+A common way to use QBuffer is through QDataStream or QTextStream, which have constructors that take a QBuffer parameter. For convenience, there are also QDataStream and QTextStream constructors that take a QByteArray parameter. These constructors create and open an internal QBuffer.
+.PP
+Note that QTextStream can also operate on a QString (a Unicode string); a QBuffer cannot.
+.PP
+You can also use QBuffer directly through the standard QIODevice functions readBlock(), writeBlock() readLine(), at(), getch(), putch() and ungetch().
+.PP
+See also QFile, QDataStream, QTextStream, QByteArray, Shared Classes, Collection Classes, and Input/Output and Networking.
+.SH MEMBER FUNCTION DOCUMENTATION
+.SH "QBuffer::QBuffer ()"
+Constructs an empty buffer.
+.SH "QBuffer::QBuffer ( QByteArray buf )"
+Constructs a buffer that operates on \fIbuf\fR.
+.PP
+If you open the buffer in write mode (<a href="qfile.html#open">IO_WriteOnly</a> or IO_ReadWrite) and write something into the buffer, \fIbuf\fR will be modified.
+.PP
+Example:
+.PP
+.nf
+.br
+ QCString str = "abc";
+.br
+ QBuffer b( str );
+.br
+ b.open( IO_WriteOnly );
+.br
+ b.at( 3 ); // position at the 4th character (the terminating \\0)
+.br
+ b.writeBlock( "def", 4 ); // write "def" including the terminating \\0
+.br
+ b.close();
+.br
+ // Now, str == "abcdef" with a terminating \\0
+.br
+.fi
+.PP
+See also setBuffer().
+.SH "QBuffer::~QBuffer ()"
+Destroys the buffer.
+.SH "QByteArray QBuffer::buffer () const"
+Returns this buffer's byte array.
+.PP
+See also setBuffer().
+.SH "bool QBuffer::setBuffer ( QByteArray buf )"
+Replaces the buffer's contents with \fIbuf\fR and returns TRUE.
+.PP
+Does nothing (and returns FALSE) if isOpen() is TRUE.
+.PP
+Note that if you open the buffer in write mode (<a href="qfile.html#open">IO_WriteOnly</a> or IO_ReadWrite) and write something into the buffer, \fIbuf\fR is also modified because QByteArray is an explicitly shared class.
+.PP
+See also buffer(), open(), and close().
+.SH "Q_LONG QBuffer::writeBlock ( const char * p, Q_ULONG len )\fC [virtual]\fR"
+Writes \fIlen\fR bytes from \fIp\fR into the buffer at the current index position, overwriting any characters there and extending the buffer if necessary. Returns the number of bytes actually written.
+.PP
+Returns -1 if an error occurred.
+.PP
+See also readBlock().
+.PP
+Reimplemented from QIODevice.
+.SH "Q_LONG QBuffer::writeBlock ( const QByteArray & data )"
+This is an overloaded member function, provided for convenience. It behaves essentially like the above function.
+.PP
+This convenience function is the same as calling
+\fCwriteBlock( data.data(), data.size() )\fR with \fIdata\fR.
+
+.SH "SEE ALSO"
+.BR http://doc.trolltech.com/qbuffer.html
+.BR http://www.trolltech.com/faq/tech.html
+.SH COPYRIGHT
+Copyright 1992-2007 Trolltech ASA, http://www.trolltech.com. See the
+license file included in the distribution for a complete license
+statement.
+.SH AUTHOR
+Generated automatically from the source code.
+.SH BUGS
+If you find a bug in Qt, please report it as described in
+.BR http://doc.trolltech.com/bughowto.html .
+Good bug reports help us to help you. Thank you.
+.P
+The definitive Qt documentation is provided in HTML format; it is
+located at $QTDIR/doc/html and can be read using Qt Assistant or with
+a web browser. This man page is provided as a convenience for those
+users who prefer man pages, although this format is not officially
+supported by Trolltech.
+.P
+If you find errors in this manual page, please report them to
+.BR qt-bugs@trolltech.com .
+Please include the name of the manual page (qbuffer.3qt) and the Qt
+version (3.3.8).