docs/latex/wx/datstrm.tex

   1 % ----------------------------------------------------------------------------
   2 % wxDataInputStream
   3 % ----------------------------------------------------------------------------
   4 \section{\class{wxDataInputStream}}\label{wxdatainputstream}
   5
   6 This class provides functions that read binary data types in a
   7 portable way. Data can be read in either big-endian or litte-endian
   8 format, little-endian being the default on all architectures.
   9
  10 If you want to read data from text files (or streams) use
  11 \helpref{wxTextInputStream}{wxtextinputstream} instead.
  12
  13 The >> operator is overloaded and you can use this class like a standard C++ iostream.
  14 Note, however, that the arguments are the fixed size types wxUint32, wxInt32 etc
  15 and on a typical 32-bit computer, none of these match to the "long" type (wxInt32
  16 is defined as signed int on 32-bit architectures) so that you cannot use long. To avoid
  17 problems (here and elsewhere), make use of the wxInt32, wxUint32, etc types.
  18
  19 For example:
  20 \begin{verbatim}
  21   wxFileInputStream input( "mytext.dat" );
  22   wxDataInputStream store( input );
  23   wxUint8 i1;
  24   float f2;
  25   wxString line;
  26
  27   store >> i1;       // read a 8 bit integer.
  28   store >> i1 >> f2; // read a 8 bit integer followed by float.
  29   store >> line;     // read a text line
  30 \end{verbatim}
  31
  32 See also \helpref{wxDataOutputStream}{wxdataoutputstream}.
  33
  34 \wxheading{Derived from}
  35
  36 None
  37
  38 \wxheading{Include files}
  39
  40 <wx/datstrm.h>
  41
  42 \latexignore{\rtfignore{\wxheading{Members}}}
  43
  44 \membersection{wxDataInputStream::wxDataInputStream}\label{wxdatainputstreamconstr}
  45
  46 \func{}{wxDataInputStream}{\param{wxInputStream\&}{ stream}}
  47
  48 Constructs a datastream object from an input stream. Only read methods will
  49 be available.
  50
  51 \wxheading{Parameters}
  52
  53 \docparam{stream}{The input stream.}
  54
  55 \membersection{wxDataInputStream::\destruct{wxDataInputStream}}
  56
  57 \func{}{\destruct{wxDataInputStream}}{\void}
  58
  59 Destroys the wxDataInputStream object.
  60
  61 \membersection{wxDataInputStream::BigEndianOrdered}
  62
  63 \func{void}{BigEndianOrdered}{\param{bool}{ be_order}}
  64
  65 If {\it be_order} is TRUE, all data will be read in big-endian
  66 order, such as written by programs on a big endian architecture
  67 (e.g. Sparc) or written by Java-Streams (which always use
  68 big-endian order).
  69
  70 \membersection{wxDataInputStream::Read8}
  71
  72 \func{wxUint8}{Read8}{\void}
  73
  74 Reads a single byte from the stream.
  75
  76 \membersection{wxDataInputStream::Read16}
  77
  78 \func{wxUint16}{Read16}{\void}
  79
  80 Reads a 16 bit integer from the stream.
  81
  82 \membersection{wxDataInputStream::Read32}
  83
  84 \func{wxUint32}{Read32}{\void}
  85
  86 Reads a 32 bit integer from the stream.
  87
  88 \membersection{wxDataInputStream::ReadDouble}
  89
  90 \func{double}{ReadDouble}{\void}
  91
  92 Reads a double (IEEE encoded) from the stream.
  93
  94 \membersection{wxDataInputStream::ReadString}
  95
  96 \func{wxString}{wxDataInputStream::ReadString}{\void}
  97
  98 Reads a string from a stream. Actually, this function first reads a long integer
  99 specifying the length of the string (without the last null character) and then
 100 reads the string.
 101
 102 % ----------------------------------------------------------------------------
 103 % wxDataOutputStream
 104 % ----------------------------------------------------------------------------
 105
 106 \section{\class{wxDataOutputStream}}\label{wxdataoutputstream}
 107
 108 This class provides functions that write binary data types in a
 109 portable way. Data can be written in either big-endian or litte-endian
 110 format, little-endian being the default on all architectures.
 111
 112 If you want to write data to text files (or streams) use
 113 \helpref{wxTextOutputStream}{wxtextoutputstream} instead.
 114
 115 The << operator is overloaded and you can use this class like a standard
 116 C++ iostream. See \helpref{wxDataInputStream}{wxdatainputstream} for its
 117 usage and caveats.
 118
 119 See also \helpref{wxDataInputStream}{wxdatainputstream}.
 120
 121 \wxheading{Derived from}
 122
 123 None
 124
 125 \latexignore{\rtfignore{\wxheading{Members}}}
 126
 127 \membersection{wxDataOutputStream::wxDataOutputStream}\label{wxdataoutputstreamconstr}
 128
 129 \func{}{wxDataOutputStream}{\param{wxOutputStream\&}{ stream}}
 130
 131 Constructs a datastream object from an output stream. Only write methods will
 132 be available.
 133
 134 \wxheading{Parameters}
 135
 136 \docparam{stream}{The output stream.}
 137
 138 \membersection{wxDataOutputStream::\destruct{wxDataOutputStream}}
 139
 140 \func{}{\destruct{wxDataOutputStream}}{\void}
 141
 142 Destroys the wxDataOutputStream object.
 143
 144 \membersection{wxDataOutputStream::BigEndianOrdered}
 145
 146 \func{void}{BigEndianOrdered}{\param{bool}{ be_order}}
 147
 148 If {\it be_order} is TRUE, all data will be written in big-endian
 149 order, e.g. for reading on a Sparc or from Java-Streams (which
 150 always use big-endian order), otherwise data will be written in
 151 little-endian order.
 152
 153 \membersection{wxDataOutputStream::Write8}
 154
 155 \func{void}{wxDataOutputStream::Write8}{{\param wxUint8 }{i8}}
 156
 157 Writes the single byte {\it i8} to the stream.
 158
 159 \membersection{wxDataOutputStream::Write16}
 160
 161 \func{void}{wxDataOutputStream::Write16}{{\param wxUint16 }{i16}}
 162
 163 Writes the 16 bit integer {\it i16} to the stream.
 164
 165 \membersection{wxDataOutputStream::Write32}
 166
 167 \func{void}{wxDataOutputStream::Write32}{{\param wxUint32 }{i32}}
 168
 169 Writes the 32 bit integer {\it i32} to the stream.
 170
 171 \membersection{wxDataOutputStream::WriteDouble}
 172
 173 \func{void}{wxDataOutputStream::WriteDouble}{{\param double }{f}}
 174
 175 Writes the double {\it f} to the stream using the IEEE format.
 176
 177 \membersection{wxDataOutputStream::WriteString}
 178
 179 \func{void}{wxDataOutputStream::WriteString}{{\param const wxString\& }{string}}
 180
 181 Writes {\it string} to the stream. Actually, this method writes the size of
 182 the string before writing {\it string} itself.
 183