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diff --git a/doc/man/man3/qbuffer.3qt b/doc/man/man3/qbuffer.3qt new file mode 100644 index 000000000..db2dc57ec --- /dev/null +++ b/doc/man/man3/qbuffer.3qt @@ -0,0 +1,138 @@ +'\" 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 [email protected] . +Please include the name of the manual page (qbuffer.3qt) and the Qt +version (3.3.8). |