Qore::StringOutputStream Class Reference

This class implements the OutputStream interface for writing bytes to a String buffer. More...

Inheritance diagram for Qore::StringOutputStream:

Public Member Methods
nothing	close ()
	Closes the output stream and releases any resources. More...
	constructor ()
	Creates the StringOutputStream. More...
	constructor (string encoding)
	Creates the StringOutputStream. More...
string	getData ()
	Returns the data written to the stream, clearing the internal buffer. More...
string	getEncoding ()
	Returns the character encoding for the StringOutputStream. More...
bool	hasData ()
	Returns True if the stream already has data. More...
nothing	write (binary data)
	Writes bytes to the output stream. More...
Public Member Methods inherited from Qore::OutputStream
	constructor ()
	Constructor. More...
Public Member Methods inherited from Qore::StreamBase
	constructor ()
	Throws an exception if called directly; this class can only be instantiated by builtin subclasses. More...
int	getThreadId ()
	Get the currently assigned thread id or -1 if not assigned to any thread.
nothing	reassignThread ()
	Reassigns current thread as thread used for stream manipulation. More...
nothing	unassignThread ()
	Unassigns current thread as thread used for stream manipulation. More...

Detailed Description

This class implements the OutputStream interface for writing bytes to a String buffer.

Example: StringOutputStream basic usage

StringOutputStream sos();
sos.write(<41>);
sos.write(<42>);
sos.write(<43>);
sos.getData();      # returns "ABC"

Note

stream classes are not designed to be accessed from multiple threads; they have been implemented without locking for fast and efficient use when used from a single thread. For methods that would be unsafe to use in another thread, any use of such methods in threads other than the thread where the constructor was called will cause a STREAM-THREAD-ERROR to be thrown, unless the stream is handed off to another thread using the StreamBase::unassignThread() method in the thread that currently owns the stream, and the StreamBase::reassignThread() method in the new thread.

See also

StreamWriter for a class that can be used to write various kinds of data to an OutputStream

Since

Qore 0.8.13

Member Function Documentation

close()

nothing Qore::StringOutputStream::close ( )

virtual

Closes the output stream and releases any resources.

Any methods called on a closed output stream will throw an exception.

Exceptions

OUTPUT-STREAM-CLOSED-ERROR	the output stream has already been closed
STREAM-THREAD-ERROR	this exception is thrown if this method is called from any thread other than the thread that created the object

Implements Qore::OutputStream.

constructor() [1/2]

Qore::StringOutputStream::constructor

(

)

Creates the StringOutputStream.

This variant assumes the Default Character Encoding for the string

Note

raw binary data is written to the output stream, so it's up to the caller to ensure that only valid character data for the given encoding is written to the StringOutputStream object, otherwise a string with invalid character data will be returned by getData()

constructor() [2/2]

Qore::StringOutputStream::constructor

(

string

encoding

)

Creates the StringOutputStream.

Parameters

encoding

the encoding to tag the string data with

Note

raw binary data is written to the output stream, so it's up to the caller to ensure that only valid character data for the given encoding is written to the StringOutputStream object, otherwise a string with invalid character data will be returned by getData()

getData()

string Qore::StringOutputStream::getData

(

)

Returns the data written to the stream, clearing the internal buffer.

Returns

the data written to the StringOutputStream

Example:

StringOutputStream sos();
sos.write(<41>);
sos.write(<42>);
sos.write(<43>);
sos.getData();      # returns "ABC"

Exceptions

OUTPUT-STREAM-CLOSED-ERROR	the output stream has already been closed
STREAM-THREAD-ERROR	this exception is thrown if this method is called from any thread other than the thread that created the object

getEncoding()

string Qore::StringOutputStream::getEncoding

(

)

Returns the character encoding for the StringOutputStream.

Code Flags:

CONSTANT

Example:

StringOutputStream sos("latin1");
string encoding = sos.getEncoding();

Returns

the character encoding for the StringOutputStream

Note

raw binary data is written to the output stream, so it's up to the caller to ensure that only valid character data for the given encoding is written to the StringOutputStream object, otherwise a string with invalid character data will be returned by getData()

hasData()

bool Qore::StringOutputStream::hasData

(

)

Returns True if the stream already has data.

Returns

True if the stream already has data

Code Flags:

RET_VALUE_ONLY

Example:

bool has_data = sos.hasData();

Exceptions

OUTPUT-STREAM-CLOSED-ERROR	the output stream has already been closed
STREAM-THREAD-ERROR	this exception is thrown if this method is called from any thread other than the thread that created the object

Since

Qore 1.1

write()

nothing Qore::StringOutputStream::write ( binary  data )

virtual

Writes bytes to the output stream.

Parameters

data	the data to write

Example:

StringOutputStream sos();
sos.write(<41>);
sos.write(<42>);
sos.write(<43>);
sos.getData();      # returns "ABC"

Exceptions

OUTPUT-STREAM-CLOSED-ERROR	the output stream has already been closed
STREAM-THREAD-ERROR	this exception is thrown if this method is called from any thread other than the thread that created the object

Implements Qore::OutputStream.