wxTextInputStream Class Reference

#include <wx/txtstrm.h>

Detailed Description

This class provides functions that reads text data using an input stream, allowing you to read text, floats, and integers.

The wxTextInputStream correctly reads text files (or streams) in DOS, Macintosh and Unix formats and reports a single newline char as a line ending.

wxTextInputStream::operator>>() is overloaded and you can use this class like a standard C++ iostream. Note, however, that the arguments are the fixed size types wxUint32, wxInt32 etc and on a typical 32-bit computer, none of these match to the "long" type (wxInt32 is defined as int on 32-bit architectures) so that you cannot use long. To avoid problems (here and elsewhere), make use of wxInt32, wxUint32 and similar types.

If you're scanning through a file using wxTextInputStream, you should check for EOF before reading the next item (word / number), because otherwise the last item may get lost. You should however be prepared to receive an empty item (empty string / zero number) at the end of file, especially on Windows systems. This is unavoidable because most (but not all) files end with whitespace (i.e. usually a newline).

For example:

wxFileInputStream input( "mytext.txt" );
wxTextInputStream text( input );
wxUint8 i1;
float f2;
wxString line;

text >> i1;       // read a 8 bit integer.
text >> i1 >> f2; // read a 8 bit integer followed by float.
text >> line;     // read a text line

Library:  wxBase

Category:  Streams

See also

wxTextOutputStream

Public Member Functions
	wxTextInputStream (wxInputStream &stream, const wxString &sep=" \t", const wxMBConv &conv=wxConvAuto())
	Constructs a text stream associated to the given input stream. More...
	~wxTextInputStream ()
	Destructor. More...
const wxInputStream &	GetInputStream () const
	Returns a pointer to the underlying input stream object. More...
wxChar	GetChar ()
	Reads a character, returns 0 if there are no more characters in the stream. More...
wxUint16	Read16 (int base=10)
	Reads a unsigned 16 bit integer from the stream. More...
wxInt16	Read16S (int base=10)
	Reads a signed 16 bit integer from the stream. More...
wxUint32	Read32 (int base=10)
	Reads a 32 bit unsigned integer from the stream. More...
wxInt32	Read32S (int base=10)
	Reads a 32 bit signed integer from the stream. More...
wxUint8	Read8 (int base=10)
	Reads a single unsigned byte from the stream, given in base base. More...
wxInt8	Read8S (int base=10)
	Reads a single signed byte from the stream. More...
double	ReadDouble ()
	Reads a double (IEEE encoded) from the stream. More...
wxString	ReadLine ()
	Reads a line from the input stream and returns it (without the end of line character). More...
wxString	ReadString ()
wxString	ReadWord ()
	Reads a word (a sequence of characters until the next separator) from the input stream. More...
void	SetStringSeparators (const wxString &sep)
	Sets the characters which are used to define the word boundaries in ReadWord(). More...

Constructor & Destructor Documentation

wxTextInputStream::wxTextInputStream	(	wxInputStream &	stream,
		const wxString &	sep = " \t",
		const wxMBConv &	conv = wxConvAuto()
	)

Constructs a text stream associated to the given input stream.

Parameters

stream	The underlying input stream.
sep	The initial string separator characters.
conv	In Unicode build only: The encoding converter used to convert the bytes in the underlying input stream to characters.

wxTextInputStream::~wxTextInputStream

(

)

Destructor.

Member Function Documentation

wxChar wxTextInputStream::GetChar

(

)

Reads a character, returns 0 if there are no more characters in the stream.

const wxInputStream& wxTextInputStream::GetInputStream

(

)

const

Returns a pointer to the underlying input stream object.

Since

2.9.2

wxUint16 wxTextInputStream::Read16

(

int

base = 10

)

Reads a unsigned 16 bit integer from the stream.

See Read8() for the description of the base parameter.

wxInt16 wxTextInputStream::Read16S

(

int

base = 10

)

Reads a signed 16 bit integer from the stream.

See Read8() for the description of the base parameter.

wxUint32 wxTextInputStream::Read32

(

int

base = 10

)

Reads a 32 bit unsigned integer from the stream.

See Read8() for the description of the base parameter.

wxInt32 wxTextInputStream::Read32S

(

int

base = 10

)

Reads a 32 bit signed integer from the stream.

See Read8() for the description of the base parameter.

wxUint8 wxTextInputStream::Read8

(

int

base = 10

)

Reads a single unsigned byte from the stream, given in base base.

The value of base must be comprised between 2 and 36, inclusive, or be a special value 0 which means that the usual rules of C numbers are applied: if the number starts with 0x it is considered to be in base 16, if it starts with 0 - in base 8 and in base 10 otherwise. Note that you may not want to specify the base 0 if you are parsing the numbers which may have leading zeroes as they can yield unexpected (to the user not familiar with C) results.

wxInt8 wxTextInputStream::Read8S

(

int

base = 10

)

Reads a single signed byte from the stream.

See Read8() for the description of the base parameter.

double wxTextInputStream::ReadDouble

(

)

Reads a double (IEEE encoded) from the stream.

wxString wxTextInputStream::ReadLine

(

)

Reads a line from the input stream and returns it (without the end of line character).

wxString wxTextInputStream::ReadString

(

)

Deprecated:

Use ReadLine() or ReadWord() instead.

Same as ReadLine().

wxString wxTextInputStream::ReadWord

(

)

Reads a word (a sequence of characters until the next separator) from the input stream.

See also

SetStringSeparators()

void wxTextInputStream::SetStringSeparators

(

const wxString &

sep

)

Sets the characters which are used to define the word boundaries in ReadWord().

The default separators are the space and TAB characters.