Qore::StreamWriter Class Reference

This class defines a stream writer for output streams. More...

Public Member Methods
	constructor (Qore::OutputStream os, *string encoding)
	Creates the StreamWriter for writing data to the given OutputStream. More...
nothing	f_printf (string fmt,...)
	Writes a formatted string with hard field widths to an output stream; string data is converted to the StreamWriter's character encoding if necessary before writing. More...
nothing	f_vprintf (string fmt, any fmt_args)
	Writes a formatted string with hard field widths to an output stream, where the second argument is the formatting argument list; string data is converted to the StreamWriter's character encoding if necessary before writing. More...
string	getEncoding ()
	Returns the character encoding for the StreamWriter. More...
OutputStream	getOutputStream ()
	Returns the OutputStream for the StreamWriter. More...
nothing	print (string str)
	Writes string data to an output stream; string data is converted to the StreamWriter's character encoding if necessary before writing. More...
nothing	printf (string fmt,...)
	Writes a formatted string with soft field widths to an output stream; string data is converted to the StreamWriter's character encoding if necessary before writing. More...
nothing	vprintf (string fmt, any fmt_args)
	Writes a formatted string with soft field widths to an output stream, where the second argument is the formatting argument list; string data is converted to the StreamWriter's character encoding if necessary before writing. More...
nothing	write (string str)
	Writes a String to the output stream. More...
nothing	write (binary b)
	Writes a Binary to the output stream. More...
nothing	writei1 (int c)
	Writes a 1-byte signed integer to the output stream. More...
nothing	writei2 (int s)
	Writes a 2-byte (16 bit) integer to the output stream in binary big-endian format. More...
nothing	writei2LSB (int s)
	Writes a 2-byte (16 bit) integer to the output stream in binary little-endian format. More...
nothing	writei4 (int i)
	Writes a 4-byte (32 bit) integer to the output stream in binary big-endian format. More...
nothing	writei4LSB (int i)
	Writes a 4-byte (32 bit) integer to the output stream in binary little-endian format. More...
nothing	writei8 (int i)
	Writes an 8-byte (64 bit) integer to the output stream in binary big-endian format. More...
nothing	writei8LSB (int i)
	Writes an 8-byte (64 bit) integer to the output stream in binary little-endian format. More...

Detailed Description

This class defines a stream writer for output streams.

Since

Qore 0.8.13

Example: StreamWriter basic usage

FileOutputStream os("log.txt");
StreamWriter sw(os, "UTF-8");
sw.print("Lorem ipsum.\n");
sw.printf("%s: %d\n", "The answer", 42);
sw.print("32-bit int values:\n");
sw.writei4(1337);
sw.writei4(0xf4f4);

See also

OutputStream

Member Function Documentation

constructor()

Qore::StreamWriter::constructor	(	Qore::OutputStream	os,
		*string	encoding
	)

Creates the StreamWriter for writing data to the given OutputStream.

Parameters

os	the OutputStream for writing data
encoding	character encoding of the StreamWriter; all passed string data will be converted to this encoding before being written to the output stream; if not present, the default character encoding is assumed

f_printf()

nothing Qore::StreamWriter::f_printf	(	string	fmt,
			...
	)

Writes a formatted string with hard field widths to an output stream; string data is converted to the StreamWriter's character encoding if necessary before writing.

This method does not allow arguments to overrun field width specifiers in the format string.

Example:

sw.f_printf("%5s\n", "hello there"); # outputs "hello\n", enforcing field width

Parameters

fmt	the format string; see String Formatting for more information about the format string

Exceptions

ENCODING-CONVERSION-ERROR

error converting from the string's character encoding to the StreamWriter's character encoding

See also

StreamWriter::printf() for a similar method that does not enforce field widths

f_vprintf()

nothing Qore::StreamWriter::f_vprintf	(	string	fmt,
		any	fmt_args
	)

Writes a formatted string with hard field widths to an output stream, where the second argument is the formatting argument list; string data is converted to the StreamWriter's character encoding if necessary before writing.

This method does not allow arguments to overrun field width specifiers in the format string.

Example:

sw.f_vprintf("%5s: %d\n", ("hello there", 2)); # outputs "hello: 2\n", enforcing field width

Parameters

fmt	the format string; see String Formatting for more information about the format string
fmt_args	the single argument or list of arguments that will be used as the argument list for the format string. If a single argument is passed instead of a list, it will be used as the first argument as if a list were passed

Exceptions

ENCODING-CONVERSION-ERROR

error converting from the string's character encoding to the StreamWriter's character encoding

See also

StreamWriter::printf() for a similar method that does not enforce field widths

getEncoding()

string Qore::StreamWriter::getEncoding

(

)

Returns the character encoding for the StreamWriter.

Code Flags:

CONSTANT

Returns the character encoding for the StreamWriter.

Returns

the character encoding for the StreamWriter

getOutputStream()

OutputStream Qore::StreamWriter::getOutputStream

(

)

Returns the OutputStream for the StreamWriter.

Returns the OutputStream for the StreamWriter.

Returns

the OutputStream for the StreamWriter

Since

0.9.0

print()

nothing Qore::StreamWriter::print

(

string

str

)

Writes string data to an output stream; string data is converted to the StreamWriter's character encoding if necessary before writing.

Example:

sw.print(str);

Parameters

str	the string to be written to the output stream; string data is converted to the StreamWriter's character encoding if necessary before writing

Exceptions

ENCODING-CONVERSION-ERROR

error converting from the string's character encoding to the StreamWriter's character encoding

Note

equivalent to write(string)

printf()

nothing Qore::StreamWriter::printf	(	string	fmt,
			...
	)

Writes a formatted string with soft field widths to an output stream; string data is converted to the StreamWriter's character encoding if necessary before writing.

This method will allow arguments to overrun field width specifiers in the format string.

Example:

sw.printf("%5s\n", "hello there"); # outputs "hello there\n", exceeding field width

Parameters

fmt	the format string; see String Formatting for more information about the format string

Exceptions

ENCODING-CONVERSION-ERROR

error converting from the string's character encoding to the StreamWriter's character encoding

See also

StreamWriter::f_printf() for a similar method that enforces field widths

vprintf()

nothing Qore::StreamWriter::vprintf	(	string	fmt,
		any	fmt_args
	)

Writes a formatted string with soft field widths to an output stream, where the second argument is the formatting argument list; string data is converted to the StreamWriter's character encoding if necessary before writing.

This method will allow arguments to overrun field width specifiers in the format string.

Example:

sw.vprintf("%5s: %d\n", ("hello there", 2)); # outputs "hello there: 2\n", exceeding field width

Parameters

fmt	the format string; see String Formatting for more information about the format string
fmt_args	the single argument or list of arguments that will be used as the argument list for the format string. If a single argument is passed instead of a list, it will be used as the first argument as if a list were passed

Exceptions

ENCODING-CONVERSION-ERROR

error converting from the string's character encoding to the StreamWriter's character encoding

See also

StreamWriter::f_vprintf() for a similar method that enforces field widths

write() [1/2]

nothing Qore::StreamWriter::write

(

binary

b

)

Writes a Binary to the output stream.

Example:

sw.write(<010203>);

Parameters

b	the binary to write

write() [2/2]

nothing Qore::StreamWriter::write

(

string

str

)

Writes a String to the output stream.

Example:

sw.write("string");

Parameters

str	the string to write

Note

equivalent to print(string)

writei1()

nothing Qore::StreamWriter::writei1

(

int

c

)

Writes a 1-byte signed integer to the output stream.

Example:

sw.writei1(val);

Parameters

c	the integer to write; only the least-significant 8 bits will be written to the file

writei2()

nothing Qore::StreamWriter::writei2

(

int

s

)

Writes a 2-byte (16 bit) integer to the output stream in binary big-endian format.

Example:

sw.writei2(val);

Parameters

s	the integer to write in binary big-endian format; only the least-significant 16 bits of the integer will be written to the file

writei2LSB()

nothing Qore::StreamWriter::writei2LSB

(

int

s

)

Writes a 2-byte (16 bit) integer to the output stream in binary little-endian format.

Example:

sw.writei2LSB(val);

Parameters

s	the integer to write in binary little-endian format; only the least-significant 16 bits of the integer will be written to the file

writei4()

nothing Qore::StreamWriter::writei4

(

int

i

)

Writes a 4-byte (32 bit) integer to the output stream in binary big-endian format.

Example:

sw.writei4(val);

Parameters

i	the integer to write in binary big-endian format; only the least-significant 32 bits of the integer will be written to the file

writei4LSB()

nothing Qore::StreamWriter::writei4LSB

(

int

i

)

Writes a 4-byte (32 bit) integer to the output stream in binary little-endian format.

Example:

sw.writei4LSB(val);

Parameters

i	the integer to write in binary little-endian format; only the least-significant 32 bits of the integer will be written to the file

writei8()

nothing Qore::StreamWriter::writei8

(

int

i

)

Writes an 8-byte (64 bit) integer to the output stream in binary big-endian format.

Example:

sw.writei8(val);

Parameters

i	the integer to write in binary big-endian format; only the least-significant 64 bits of the integer will be written to the file

writei8LSB()

nothing Qore::StreamWriter::writei8LSB

(

int

i

)

Writes an 8-byte (64 bit) integer to the output stream in binary little-endian format.

Example:

sw.writei8LSB(val);

Parameters

i	the integer to write in binary little-endian format; only the least-significant 64 bits of the integer will be written to the file