xtd::io::binary_writer Class Reference

Inheritance diagram for xtd::io::binary_writer:

Definition

Writes primitive types in binary to a stream and supports writing strings.

class core_export_ binary_writer : public xtd::object

Inheritance

xtd::object → xtd::io::binary_writer

Header

#include <xtd/io/binary_writer>

Namespace

xtd::io

Library

xtd.core

Examples

The following code example demonstrates how to store and retrieve application settings in a file.

#include <xtd/xtd>
 
class program {
  inline static const string file_name = "app_settings.dat";
public:
  static auto main() {
    write_default_values();
    display_values();
  }
  
  static void write_default_values() {
    block_scope_(auto fs = file::open(file_name, std::ios::out | std::ios::binary | std::ios::trunc)) {
      auto writer = binary_writer {fs};
      writer.write(1.250F);
      writer.write(R"(c:\Temp)");
      writer.write(10);
      writer.write(true);
    }
  }
  
  static void display_values() {
    auto aspect_ratio = .0f;
    auto temp_directory = string::empty_string;
    auto auto_save_time = 0;
    auto show_status_bar = false;
    
    if (file::exists(file_name)) {
      block_scope_(auto fs = file::open(file_name, std::ios::in | std::ios::binary)) {
        auto reader = binary_reader {fs};
        aspect_ratio = reader.read_single();
        temp_directory = reader.read_string();
        auto_save_time = reader.read_int32();
        show_status_bar = reader.read_boolean();
      }
      
      console::write_line("Aspect ratio set to: {}", aspect_ratio);
      console::write_line("Temp directory is: {}", temp_directory);
      console::write_line("Auto save time set to: {}", auto_save_time);
      console::write_line("Show status bar: {}", show_status_bar);
    }
  }
};
 
startup_(program::main);
 
// This code produces the following output :
//
// Aspect ratio set to: 1.25
// Temp directory is: c:\Temp
// Auto save time set to: 10
// Show status bar: true
 

Examples

The same example with stream operators.

#include <xtd/xtd>
 
class program {
  inline static const string file_name = "app_settings.dat";
public:
  static auto main() {
    write_default_values();
    display_values();
  }
  
  static void write_default_values() {
    block_scope_(auto fs = file::open(file_name, std::ios::out | std::ios::binary | std::ios::trunc)) {
      auto writer = binary_writer {fs};
      writer << 1.250F;
      writer << R"(c:\Temp)";
      writer << 10;
      writer << true;
    }
  }
  
  static void display_values() {
    auto aspect_ratio = .0f;
    auto temp_directory = string::empty_string;
    auto auto_save_time = 0;
    auto show_status_bar = false;
 
    if (file::exists(file_name)) {
      block_scope_(auto fs = file::open(file_name, std::ios::in | std::ios::binary)) {
        auto reader = binary_reader {fs};
        reader >> aspect_ratio;
        reader >> temp_directory;
        reader >> auto_save_time;
        reader >> show_status_bar;
      }
      
      console::write_line("Aspect ratio set to: {}", aspect_ratio);
      console::write_line("Temp directory is: {}", temp_directory);
      console::write_line("Auto save time set to: {}", auto_save_time);
      console::write_line("Show status bar: {}", show_status_bar);
    }
  }
};
 
startup_(program::main);
 
// This code produces the following output :
//
// Aspect ratio set to: 1.25
// Temp directory is: c:\Temp
// Auto save time set to: 10
// Show status bar: true
 

Remarks

The xtd::io::binary_writer class provides methods that simplify writing primitive data types to a stream. For example, you can use the Write method to write a Boolean value to the stream as a one-byte value. The class includes write methods that support different data types.

When you create a new instance of the xtd::io::binary_writer class, you provide the stream to write to.

Note

xtd xtd::io::binary_reader and xtd::io::binary_writer are fully compatible with .NET BinaryReader/BinaryWriter.

Files written with xtd can be read directly in C# and vice versa, following the same binary format conventions (7-bit encoded string lengths, little-endian integers, etc.).

Examples

binary_reader3.cpp.

Public Constructors
	binary_writer (const xtd::string &path)
	Initializes a new instance of the binary_writer class for the specified file name.
	binary_writer (std::ostream &stream)
	Initializes a new instance of the binary_writer class for the specified stream.

Public Properties
std::optional< xtd::ref< std::ostream > >	base_stream () const
	Returns the underlying stream.

Public Methods
virtual void	close ()
	Closes the xtd::io::binary_writer object and the underlying stream, and releases any system resources associated with the reader.
virtual void	flush ()
	Clears all buffers for the current writer and causes any buffered data to be written to the underlying device.
virtual size_t	seek (size_t offset, std::ios::seekdir origin)
	Sets the position within the current stream.
virtual void	write (bool value)
	Writes a one-byte boolean value to the current stream, with 0 representing false and 1 representing true.
virtual void	write (xtd::byte value)
	Writes an unsigned byte to the current stream and advances the stream position by one byte.
virtual void	write (char value)
	Writes a character to the current stream and advances the current position by one byte.
template<size_t size>
void	write (const std::array< xtd::byte, size > &buffer)
	Writes a byte array to the underlying stream.
template<size_t size>
void	write (const std::array< char, size > &buffer)
	Writes a character array to the underlying stream.
virtual void	write (const xtd::read_only_span< xtd::byte > &buffer)
	Writes a byte array to the underlying stream.
virtual void	write (const xtd::array< xtd::byte > &buffer, size_t index, size_t count)
	Writes a region of a byte array to the current stream.
virtual void	write (const xtd::read_only_span< char > &buffer)
	Writes a character array to the underlying stream.
virtual void	write (const xtd::array< char > &buffer, size_t index, size_t count)
	Writes a region of a character array to the current stream.
virtual void	write (double value)
	Writes an eight-byte floating-point value to the current stream and advances the stream position by eight bytes.
virtual void	write (int16 value)
	Writes a two-byte signed integer to the current stream and advances the stream position by two bytes.
virtual void	write (int32 value)
	Writes a four-byte signed integer to the current stream and advances the stream position by four bytes.
virtual void	write (int64 value)
	Writes a eight-byte signed integer to the current stream and advances the stream position by eight bytes.
virtual void	write (sbyte value)
	Writes an signed byte to the current stream and advances the stream position by one byte.
virtual void	write (float value)
	Writes an four-byte floating-point value to the current stream and advances the stream position by four bytes.
virtual void	write (const string &value)
	Writes a length-prefixed string to this stream, and advances the current position of the stream and the specific characters being written to the stream.
virtual void	write (uint16 value)
	Writes a two-byte unsigned integer to the current stream and advances the stream position by two bytes.
virtual void	write (uint32 value)
	Writes a four-byte unsigned integer to the current stream and advances the stream position by four bytes.
virtual void	write (uint64 value)
	Writes a eight-byte unsigned integer to the current stream and advances the stream position by eight bytes.

Additional Inherited Members
	object ()=default
	Create a new instance of the ultimate base class object.
virtual bool	equals (const object &obj) const noexcept
	Determines whether the specified object is equal to the current object.
virtual xtd::size	get_hash_code () const noexcept
	Serves as a hash function for a particular type.
virtual type_object	get_type () const noexcept
	Gets the type of the current instance.
template<class object_t>
xtd::unique_ptr_object< object_t >	memberwise_clone () const
	Creates a shallow copy of the current object.
virtual xtd::string	to_string () const noexcept
	Returns a xtd::string that represents the current object.
template<class object_a_t, class object_b_t>
static bool	equals (const object_a_t &object_a, const object_b_t &object_b) noexcept
	Determines whether the specified object instances are considered equal.
template<class object_a_t, class object_b_t>
static bool	reference_equals (const object_a_t &object_a, const object_b_t &object_b) noexcept
	Determines whether the specified object instances are the same instance.

Constructor & Destructor Documentation

binary_writer() [1/2]

xtd::io::binary_writer::binary_writer ( const xtd::string & path )

explicit

Initializes a new instance of the binary_writer class for the specified file name.

Parameters

path	The complete file path to be read.

Exceptions

xtd::argument_exception	path contains one or more of the invalid characters -or- The system could not retrieve the absolute path.
xtd::io::io_exception	the handle of the specified file cannot be opened

binary_writer() [2/2]

xtd::io::binary_writer::binary_writer ( std::ostream & stream )

explicit

Initializes a new instance of the binary_writer class for the specified stream.

Parameters

stream

The stream to be read.

Member Function Documentation

base_stream()

std::optional< xtd::ref< std::ostream > > xtd::io::binary_writer::base_stream

(

)

const

Returns the underlying stream.

Returns

The underlying stream.

Remarks

For a list of common I/O tasks, see Common I/O Tasks.

close()

virtual void xtd::io::binary_writer::close ( )

virtual

Closes the xtd::io::binary_writer object and the underlying stream, and releases any system resources associated with the reader.

flush()

virtual void xtd::io::binary_writer::flush ( )

virtual

Clears all buffers for the current writer and causes any buffered data to be written to the underlying device.

Remarks

This default method does nothing, but derived classes can virtual the method to provide the appropriate functionality

seek()

virtual size_t xtd::io::binary_writer::seek ( size_t offset, std::ios::seekdir origin )

virtual

Sets the position within the current stream.

Parameters

ofsset	A byte offset relative to origin.
origin	A field of std::ios::seekdir indicating the reference point from which the new position is to be obtained.

Returns

The position with the current stream.

Exceptions

xtd::io::io_exception

The file pointer was moved to an invalid location.

Remarks

For a list of common I/O tasks, see Common I/O Tasks.

write() [1/19]

virtual void xtd::io::binary_writer::write ( bool value )

virtual

Writes a one-byte boolean value to the current stream, with 0 representing false and 1 representing true.

Parameters

value

The boolean value to write (0 or 1).

Exceptions

xtd::io::io_exception

An I/O error occurs.

Remarks

For a list of common I/O tasks, see Common I/O Tasks.

write() [2/19]

virtual void xtd::io::binary_writer::write ( xtd::byte value )

virtual

Writes an unsigned byte to the current stream and advances the stream position by one byte.

Parameters

value

The unsigned byte to write.

Exceptions

xtd::io::io_exception

An I/O error occurs.

Remarks

For a list of common I/O tasks, see Common I/O Tasks.

write() [3/19]

virtual void xtd::io::binary_writer::write ( char value )

virtual

Writes a character to the current stream and advances the current position by one byte.

Parameters

value

The character to write.

Exceptions

xtd::io::io_exception

An I/O error occurs.

Remarks

For a list of common I/O tasks, see Common I/O Tasks.

write() [4/19]

template<size_t size>

void xtd::io::binary_writer::write ( const std::array< xtd::byte, size > & buffer )

inline

Writes a byte array to the underlying stream.

Parameters

buffer

A byte array containing the data to write.

Exceptions

xtd::io::io_exception

An I/O error occurs.

Remarks

For a list of common I/O tasks, see Common I/O Tasks.

write() [5/19]

template<size_t size>

void xtd::io::binary_writer::write ( const std::array< char, size > & buffer )

inline

Writes a character array to the underlying stream.

Parameters

buffer

A character array containing the data to write.

Exceptions

xtd::io::io_exception

An I/O error occurs.

Remarks

For a list of common I/O tasks, see Common I/O Tasks.

write() [6/19]

virtual void xtd::io::binary_writer::write ( const xtd::read_only_span< xtd::byte > & buffer )

virtual

Writes a byte array to the underlying stream.

Parameters

buffer

A byte array containing the data to write.

Exceptions

xtd::io::io_exception

An I/O error occurs.

Remarks

For a list of common I/O tasks, see Common I/O Tasks.

write() [7/19]

virtual void xtd::io::binary_writer::write ( const xtd::array< xtd::byte > & buffer, size_t index, size_t count )

virtual

Writes a region of a byte array to the current stream.

Parameters

buffer	A byte array containing the data to write.
index	The index of the first byte to read from buffer and to write to the stream.
count	The number of bytes to read from buffer and to write to the stream.

Exceptions

xtd::argument_exception	The buffer length minus index is less than count.
xtd::io::io_exception	An I/O error occurs.

Remarks

For a list of common I/O tasks, see Common I/O Tasks.

write() [8/19]

virtual void xtd::io::binary_writer::write ( const xtd::read_only_span< char > & buffer )

virtual

Writes a character array to the underlying stream.

Parameters

buffer

A character array containing the data to write.

Exceptions

xtd::io::io_exception

An I/O error occurs.

Remarks

For a list of common I/O tasks, see Common I/O Tasks.

write() [9/19]

virtual void xtd::io::binary_writer::write ( const xtd::array< char > & buffer, size_t index, size_t count )

virtual

Writes a region of a character array to the current stream.

Parameters

buffer	A character array containing the data to write.
index	The index of the first byte to read from buffer and to write to the stream.
count	The number of bytes to read from buffer and to write to the stream.

Exceptions

xtd::argument_exception	The buffer length minus index is less than count.
xtd::io::io_exception	An I/O error occurs.

Remarks

For a list of common I/O tasks, see Common I/O Tasks.

write() [10/19]

virtual void xtd::io::binary_writer::write ( double value )

virtual

Writes an eight-byte floating-point value to the current stream and advances the stream position by eight bytes.

Parameters

value

The eight-byte floating-point value to write.

Exceptions

xtd::io::io_exception

An I/O error occurs.

Remarks

For a list of common I/O tasks, see Common I/O Tasks.

write() [11/19]

virtual void xtd::io::binary_writer::write ( int16 value )

virtual

Writes a two-byte signed integer to the current stream and advances the stream position by two bytes.

Parameters

value

The two-byte signed integer to write.

Exceptions

xtd::io::io_exception

An I/O error occurs.

Remarks

For a list of common I/O tasks, see Common I/O Tasks.

write() [12/19]

virtual void xtd::io::binary_writer::write ( int32 value )

virtual

Writes a four-byte signed integer to the current stream and advances the stream position by four bytes.

Parameters

value

The four-byte signed integer to write.

Exceptions

xtd::io::io_exception

An I/O error occurs.

Remarks

For a list of common I/O tasks, see Common I/O Tasks.

write() [13/19]

virtual void xtd::io::binary_writer::write ( int64 value )

virtual

Writes a eight-byte signed integer to the current stream and advances the stream position by eight bytes.

Parameters

value

The eight-byte signed integer to write.

Exceptions

xtd::io::io_exception

An I/O error occurs.

Remarks

For a list of common I/O tasks, see Common I/O Tasks.

write() [14/19]

virtual void xtd::io::binary_writer::write ( sbyte value )

virtual

Writes an signed byte to the current stream and advances the stream position by one byte.

Parameters

value

The signed byte to write.

Exceptions

xtd::io::io_exception

An I/O error occurs.

Remarks

For a list of common I/O tasks, see Common I/O Tasks.

write() [15/19]

virtual void xtd::io::binary_writer::write ( float value )

virtual

Writes an four-byte floating-point value to the current stream and advances the stream position by four bytes.

Parameters

value

The four-byte floating-point value to write.

Exceptions

xtd::io::io_exception

An I/O error occurs.

Remarks

For a list of common I/O tasks, see Common I/O Tasks.

write() [16/19]

virtual void xtd::io::binary_writer::write ( const string & value )

virtual

Writes a length-prefixed string to this stream, and advances the current position of the stream and the specific characters being written to the stream.

Parameters

value

The value to write.

Exceptions

xtd::io::io_exception

An I/O error occurs.

Remarks

For a list of common I/O tasks, see Common I/O Tasks.

write() [17/19]

virtual void xtd::io::binary_writer::write ( uint16 value )

virtual

Writes a two-byte unsigned integer to the current stream and advances the stream position by two bytes.

Parameters

value

The two-byte unsigned integer to write.

Exceptions

xtd::io::io_exception

An I/O error occurs.

Remarks

For a list of common I/O tasks, see Common I/O Tasks.

write() [18/19]

virtual void xtd::io::binary_writer::write ( uint32 value )

virtual

Writes a four-byte unsigned integer to the current stream and advances the stream position by four bytes.

Parameters

value

The four-byte unsigned integer to write.

Exceptions

xtd::io::io_exception

An I/O error occurs.

Remarks

For a list of common I/O tasks, see Common I/O Tasks.

write() [19/19]

virtual void xtd::io::binary_writer::write ( uint64 value )

virtual

Writes a eight-byte unsigned integer to the current stream and advances the stream position by eight bytes.

Parameters

value

The eight-byte unsigned integer to write.

Exceptions

xtd::io::io_exception

An I/O error occurs.

Remarks

For a list of common I/O tasks, see Common I/O Tasks.

---

The documentation for this class was generated from the following file:

• xtd.core/include/xtd/io/binary_writer.hpp