docs/latex/wx/datistrm.tex

   1 \section{\class{wxDataInputStream}}\label{wxdatainputstream}
   2
   3 This class provides functions that read binary data types in a
   4 portable way. Data can be read in either big-endian or little-endian
   5 format, little-endian being the default on all architectures.
   6
   7 If you want to read data from text files (or streams) use
   8 \helpref{wxTextInputStream}{wxtextinputstream} instead.
   9
  10 The >> operator is overloaded and you can use this class like a standard C++ iostream.
  11 Note, however, that the arguments are the fixed size types wxUint32, wxInt32 etc
  12 and on a typical 32-bit computer, none of these match to the "long" type (wxInt32
  13 is defined as signed int on 32-bit architectures) so that you cannot use long. To avoid
  14 problems (here and elsewhere), make use of the wxInt32, wxUint32, etc types.
  15
  16 For example:
  17
  18 \begin{verbatim}
  19   wxFileInputStream input( "mytext.dat" );
  20   wxDataInputStream store( input );
  21   wxUint8 i1;
  22   float f2;
  23   wxString line;
  24
  25   store >> i1;       // read a 8 bit integer.
  26   store >> i1 >> f2; // read a 8 bit integer followed by float.
  27   store >> line;     // read a text line
  28 \end{verbatim}
  29
  30 See also \helpref{wxDataOutputStream}{wxdataoutputstream}.
  31
  32 \wxheading{Derived from}
  33
  34 None
  35
  36 \wxheading{Include files}
  37
  38 <wx/datstrm.h>
  39
  40 \latexignore{\rtfignore{\wxheading{Members}}}
  41
  42 \membersection{wxDataInputStream::wxDataInputStream}\label{wxdatainputstreamconstr}
  43
  44 \func{}{wxDataInputStream}{\param{wxInputStream\&}{ stream}}
  45
  46 Constructs a datastream object from an input stream. Only read methods will
  47 be available.
  48
  49 \wxheading{Parameters}
  50
  51 \docparam{stream}{The input stream.}
  52
  53 \membersection{wxDataInputStream::\destruct{wxDataInputStream}}
  54
  55 \func{}{\destruct{wxDataInputStream}}{\void}
  56
  57 Destroys the wxDataInputStream object.
  58
  59 \membersection{wxDataInputStream::BigEndianOrdered}
  60
  61 \func{void}{BigEndianOrdered}{\param{bool}{ be\_order}}
  62
  63 If {\it be\_order} is TRUE, all data will be read in big-endian
  64 order, such as written by programs on a big endian architecture
  65 (e.g. Sparc) or written by Java-Streams (which always use
  66 big-endian order).
  67
  68 \membersection{wxDataInputStream::Read8}
  69
  70 \func{wxUint8}{Read8}{\void}
  71
  72 Reads a single byte from the stream.
  73
  74 \membersection{wxDataInputStream::Read16}
  75
  76 \func{wxUint16}{Read16}{\void}
  77
  78 Reads a 16 bit integer from the stream.
  79
  80 \membersection{wxDataInputStream::Read32}
  81
  82 \func{wxUint32}{Read32}{\void}
  83
  84 Reads a 32 bit integer from the stream.
  85
  86 \membersection{wxDataInputStream::ReadDouble}
  87
  88 \func{double}{ReadDouble}{\void}
  89
  90 Reads a double (IEEE encoded) from the stream.
  91
  92 \membersection{wxDataInputStream::ReadString}
  93
  94 \func{wxString}{ReadString}{\void}
  95
  96 Reads a string from a stream. Actually, this function first reads a long integer
  97 specifying the length of the string (without the last null character) and then
  98 reads the string.
  99
 100