JUCE  v5.4.1-191-g0ab5e696f
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juce::WebInputStream Class Reference

An InputStream which can be used to read from a given url. More...

#include <juce_WebInputStream.h>

Inheritance diagram for juce::WebInputStream:
Collaboration diagram for juce::WebInputStream:

Classes

class  Listener
 Used to receive callbacks for data send progress. More...
 

Public Member Functions

 WebInputStream (const URL &url, const bool usePost)
 Creates a new WebInputstream which can be used to read from a url. More...
 
 ~WebInputStream () override
 
void cancel ()
 Will cancel a blocking read and prevent any subsequent connection attempts. More...
 
bool connect (Listener *listener)
 Wait until the first byte is ready for reading. More...
 
int64 getNumBytesRemaining ()
 Returns the number of bytes available for reading, or a negative value if the remaining length is not known. More...
 
int64 getPosition () override
 Returns the offset of the next byte that will be read from the stream. More...
 
StringPairArray getRequestHeaders () const
 Returns a string array pair of the request headers. More...
 
StringPairArray getResponseHeaders ()
 Returns a string array pair of response headers. More...
 
int getStatusCode ()
 Returns the status code returned by the http server. More...
 
int64 getTotalLength () override
 Returns the total number of bytes available for reading in this stream. More...
 
bool isError () const
 Returns true if there was an error during the connection attempt. More...
 
bool isExhausted () override
 Returns true if the stream has no more data to read. More...
 
int read (void *destBuffer, int maxBytesToRead) override
 Reads some data from the stream into a memory buffer. More...
 
virtual bool readBool ()
 Reads a boolean from the stream. More...
 
virtual char readByte ()
 Reads a byte from the stream. More...
 
virtual int readCompressedInt ()
 Reads an encoded 32-bit number from the stream using a space-saving compressed format. More...
 
virtual double readDouble ()
 Reads eight bytes as a 64-bit floating point value. More...
 
virtual double readDoubleBigEndian ()
 Reads eight bytes as a 64-bit floating point value. More...
 
virtual String readEntireStreamAsString ()
 Tries to read the whole stream and turn it into a string. More...
 
virtual float readFloat ()
 Reads four bytes as a 32-bit floating point value. More...
 
virtual float readFloatBigEndian ()
 Reads four bytes as a 32-bit floating point value. More...
 
virtual int readInt ()
 Reads four bytes from the stream as a little-endian 32-bit value. More...
 
virtual int64 readInt64 ()
 Reads eight bytes from the stream as a little-endian 64-bit value. More...
 
virtual int64 readInt64BigEndian ()
 Reads eight bytes from the stream as a big-endian 64-bit value. More...
 
virtual int readIntBigEndian ()
 Reads four bytes from the stream as a big-endian 32-bit value. More...
 
virtual size_t readIntoMemoryBlock (MemoryBlock &destBlock, ssize_t maxNumBytesToRead=-1)
 Reads from the stream and appends the data to a MemoryBlock. More...
 
virtual String readNextLine ()
 Reads a UTF-8 string from the stream, up to the next linefeed or carriage return. More...
 
virtual short readShort ()
 Reads two bytes from the stream as a little-endian 16-bit value. More...
 
virtual short readShortBigEndian ()
 Reads two bytes from the stream as a little-endian 16-bit value. More...
 
virtual String readString ()
 Reads a zero-terminated UTF-8 string from the stream. More...
 
bool setPosition (int64 wantedPos) override
 Tries to move the current read position of the stream. More...
 
virtual void skipNextBytes (int64 numBytesToSkip)
 Reads and discards a number of bytes from the stream. More...
 
WebInputStreamwithConnectionTimeout (int timeoutInMs)
 Specify the connection time-out. More...
 
WebInputStreamwithCustomRequestCommand (const String &customRequestCommand)
 Override the http command that is sent. More...
 
WebInputStreamwithExtraHeaders (const String &extraHeaders)
 Add extra headers to http request. More...
 
WebInputStreamwithNumRedirectsToFollow (int numRedirects)
 Specify the number of redirects to be followed. More...
 

Static Private Member Functions

static void createHeadersAndPostData (const URL &, String &, MemoryBlock &)
 
static StringPairArray parseHttpHeaders (const String &headerData)
 

Private Attributes

bool hasCalledConnect
 
Pimpl *const pimpl
 

Friends

class Pimpl
 

Detailed Description

An InputStream which can be used to read from a given url.

{Core}

Constructor & Destructor Documentation

◆ WebInputStream()

juce::WebInputStream::WebInputStream ( const URL url,
const bool  usePost 
)

Creates a new WebInputstream which can be used to read from a url.

Parameters
urlThe url that should be retrieved. This parameter may also contain post data and/or parameters.
usePostSpecifies whether a GET or a POST command should be used. This parameter will also influence the way parameters are encoded.

◆ ~WebInputStream()

juce::WebInputStream::~WebInputStream ( )
override

Member Function Documentation

◆ cancel()

void juce::WebInputStream::cancel ( )

Will cancel a blocking read and prevent any subsequent connection attempts.

◆ connect()

bool juce::WebInputStream::connect ( Listener listener)

Wait until the first byte is ready for reading.

This method will attempt to connect to the url given in the constructor and block until the status code and all response headers have been received or an error has occurred.

Note that most methods will call connect internally if they are called without an established connection. Therefore, it is not necessary to explicitly call connect unless you would like to use a custom listener.

After a successful call to connect, getResponseHeaders, getTotalLength and getStatusCode will all be non-blocking.

Parameters
listenerA listener to receive progress callbacks on the status of a POST data upload.
See also
getResponseHeaders, getTotalLength, getStatusCode

◆ createHeadersAndPostData()

static void juce::WebInputStream::createHeadersAndPostData ( const URL ,
String ,
MemoryBlock  
)
staticprivate

◆ getNumBytesRemaining()

int64 juce::InputStream::getNumBytesRemaining ( )
inherited

Returns the number of bytes available for reading, or a negative value if the remaining length is not known.

See also
getTotalLength

◆ getPosition()

int64 juce::WebInputStream::getPosition ( )
overridevirtual

Returns the offset of the next byte that will be read from the stream.

See also
setPosition

Implements juce::InputStream.

◆ getRequestHeaders()

StringPairArray juce::WebInputStream::getRequestHeaders ( ) const

Returns a string array pair of the request headers.

◆ getResponseHeaders()

StringPairArray juce::WebInputStream::getResponseHeaders ( )

Returns a string array pair of response headers.

If getResponseHeaders is called without an established connection, then getResponseHeaders will call connect internally and block until connect returns - either due to a successful connection or a connection error.

See also
connect

◆ getStatusCode()

int juce::WebInputStream::getStatusCode ( )

Returns the status code returned by the http server.

If getStatusCode is called without an established connection, then getStatusCode will call connect internally and block until connect returns - either due to a successful connection or a connection error.

See also
connect

◆ getTotalLength()

int64 juce::WebInputStream::getTotalLength ( )
overridevirtual

Returns the total number of bytes available for reading in this stream.

Note that this is the number of bytes available from the start of the stream, not from the current position.

If getTotalLength is called without an established connection, then getTotalLength will call connect internally and block until connect returns - either due to a successful connection or a connection error.

If the size of the stream isn't actually known, this will return -1.

Implements juce::InputStream.

◆ isError()

bool juce::WebInputStream::isError ( ) const

Returns true if there was an error during the connection attempt.

◆ isExhausted()

bool juce::WebInputStream::isExhausted ( )
overridevirtual

Returns true if the stream has no more data to read.

Implements juce::InputStream.

◆ parseHttpHeaders()

static StringPairArray juce::WebInputStream::parseHttpHeaders ( const String headerData)
staticprivate

◆ read()

int juce::WebInputStream::read ( void *  destBuffer,
int  maxBytesToRead 
)
overridevirtual

Reads some data from the stream into a memory buffer.

This method will block until the bytesToRead bytes are available.

This method calls connect internally if the connection hasn't already been established.

Parameters
destBufferthe destination buffer for the data. This must not be null.
maxBytesToReadthe maximum number of bytes to read - make sure the memory block passed in is big enough to contain this many bytes. This value must not be negative.
Returns
the actual number of bytes that were read, which may be less than maxBytesToRead if the stream is exhausted before it gets that far

Implements juce::InputStream.

◆ readBool()

virtual bool juce::InputStream::readBool ( )
virtualinherited

Reads a boolean from the stream.

The bool is encoded as a single byte - non-zero for true, 0 for false. If the stream is exhausted, this will return false.

See also
OutputStream::writeBool

◆ readByte()

virtual char juce::InputStream::readByte ( )
virtualinherited

Reads a byte from the stream.

If the stream is exhausted, this will return zero.

See also
OutputStream::writeByte

◆ readCompressedInt()

virtual int juce::InputStream::readCompressedInt ( )
virtualinherited

Reads an encoded 32-bit number from the stream using a space-saving compressed format.

For small values, this is more space-efficient than using readInt() and OutputStream::writeInt() The format used is: number of significant bytes + up to 4 bytes in little-endian order.

See also
OutputStream::writeCompressedInt()

◆ readDouble()

virtual double juce::InputStream::readDouble ( )
virtualinherited

Reads eight bytes as a 64-bit floating point value.

The raw 64-bit encoding of the double is read from the stream as a little-endian int64. If the stream is exhausted partway through reading the bytes, this will return zero.

See also
OutputStream::writeDouble, readFloat

◆ readDoubleBigEndian()

virtual double juce::InputStream::readDoubleBigEndian ( )
virtualinherited

Reads eight bytes as a 64-bit floating point value.

The raw 64-bit encoding of the double is read from the stream as a big-endian int64. If the stream is exhausted partway through reading the bytes, this will return zero.

See also
OutputStream::writeDoubleBigEndian, readFloatBigEndian

◆ readEntireStreamAsString()

virtual String juce::InputStream::readEntireStreamAsString ( )
virtualinherited

Tries to read the whole stream and turn it into a string.

This will read from the stream's current position until the end-of-stream. It can read from UTF-8 data, or UTF-16 if it detects suitable header-bytes.

◆ readFloat()

virtual float juce::InputStream::readFloat ( )
virtualinherited

Reads four bytes as a 32-bit floating point value.

The raw 32-bit encoding of the float is read from the stream as a little-endian int. If the stream is exhausted partway through reading the bytes, this will return zero.

See also
OutputStream::writeFloat, readDouble

◆ readFloatBigEndian()

virtual float juce::InputStream::readFloatBigEndian ( )
virtualinherited

Reads four bytes as a 32-bit floating point value.

The raw 32-bit encoding of the float is read from the stream as a big-endian int. If the stream is exhausted partway through reading the bytes, this will return zero.

See also
OutputStream::writeFloatBigEndian, readDoubleBigEndian

◆ readInt()

virtual int juce::InputStream::readInt ( )
virtualinherited

Reads four bytes from the stream as a little-endian 32-bit value.

If the next four bytes are byte1 to byte4, this returns (byte1 | (byte2 << 8) | (byte3 << 16) | (byte4 << 24)).

If the stream is exhausted partway through reading the bytes, this will return zero.

See also
OutputStream::writeInt, readIntBigEndian

◆ readInt64()

virtual int64 juce::InputStream::readInt64 ( )
virtualinherited

Reads eight bytes from the stream as a little-endian 64-bit value.

If the next eight bytes are byte1 to byte8, this returns (byte1 | (byte2 << 8) | (byte3 << 16) | (byte4 << 24) | (byte5 << 32) | (byte6 << 40) | (byte7 << 48) | (byte8 << 56)).

If the stream is exhausted partway through reading the bytes, this will return zero.

See also
OutputStream::writeInt64, readInt64BigEndian

◆ readInt64BigEndian()

virtual int64 juce::InputStream::readInt64BigEndian ( )
virtualinherited

Reads eight bytes from the stream as a big-endian 64-bit value.

If the next eight bytes are byte1 to byte8, this returns (byte8 | (byte7 << 8) | (byte6 << 16) | (byte5 << 24) | (byte4 << 32) | (byte3 << 40) | (byte2 << 48) | (byte1 << 56)).

If the stream is exhausted partway through reading the bytes, this will return zero.

See also
OutputStream::writeInt64BigEndian, readInt64

◆ readIntBigEndian()

virtual int juce::InputStream::readIntBigEndian ( )
virtualinherited

Reads four bytes from the stream as a big-endian 32-bit value.

If the next four bytes are byte1 to byte4, this returns (byte4 | (byte3 << 8) | (byte2 << 16) | (byte1 << 24)).

If the stream is exhausted partway through reading the bytes, this will return zero.

See also
OutputStream::writeIntBigEndian, readInt

◆ readIntoMemoryBlock()

virtual size_t juce::InputStream::readIntoMemoryBlock ( MemoryBlock destBlock,
ssize_t  maxNumBytesToRead = -1 
)
virtualinherited

Reads from the stream and appends the data to a MemoryBlock.

Parameters
destBlockthe block to append the data onto
maxNumBytesToReadif this is a positive value, it sets a limit to the number of bytes that will be read - if it's negative, data will be read until the stream is exhausted.
Returns
the number of bytes that were added to the memory block

◆ readNextLine()

virtual String juce::InputStream::readNextLine ( )
virtualinherited

Reads a UTF-8 string from the stream, up to the next linefeed or carriage return.

This will read up to the next "\n" or "\r\n" or end-of-stream.

After this call, the stream's position will be left pointing to the next character following the line-feed, but the linefeeds aren't included in the string that is returned.

◆ readShort()

virtual short juce::InputStream::readShort ( )
virtualinherited

Reads two bytes from the stream as a little-endian 16-bit value.

If the next two bytes read are byte1 and byte2, this returns (byte1 | (byte2 << 8)). If the stream is exhausted partway through reading the bytes, this will return zero.

See also
OutputStream::writeShort, readShortBigEndian

◆ readShortBigEndian()

virtual short juce::InputStream::readShortBigEndian ( )
virtualinherited

Reads two bytes from the stream as a little-endian 16-bit value.

If the next two bytes read are byte1 and byte2, this returns (byte2 | (byte1 << 8)). If the stream is exhausted partway through reading the bytes, this will return zero.

See also
OutputStream::writeShortBigEndian, readShort

◆ readString()

virtual String juce::InputStream::readString ( )
virtualinherited

Reads a zero-terminated UTF-8 string from the stream.

This will read characters from the stream until it hits a null character or end-of-stream.

See also
OutputStream::writeString, readEntireStreamAsString

Reimplemented in juce::BufferedInputStream.

◆ setPosition()

bool juce::WebInputStream::setPosition ( int64  wantedPos)
overridevirtual

Tries to move the current read position of the stream.

The position is an absolute number of bytes from the stream's start.

For a WebInputStream, this method will fail if wantedPos is smaller than the curent position. If wantedPos is greater than the current position, then calling setPosition is the same as calling read, i.e. the skipped data will still be downloaded, although skipped bytes will be discarded immedietely.

Returns
true if the stream manages to reposition itself correctly
See also
getPosition

Implements juce::InputStream.

◆ skipNextBytes()

virtual void juce::InputStream::skipNextBytes ( int64  numBytesToSkip)
virtualinherited

Reads and discards a number of bytes from the stream.

Some input streams might implement this more efficiently, but the base class will just keep reading data until the requisite number of bytes have been done. For large skips it may be quicker to call setPosition() with the required position.

Reimplemented in juce::MemoryInputStream.

◆ withConnectionTimeout()

WebInputStream& juce::WebInputStream::withConnectionTimeout ( int  timeoutInMs)

Specify the connection time-out.

Returns a reference to itself so that several methods can be chained.

Parameters
timeoutInMsthe number of milliseconds to wait until the connection request is aborted.

◆ withCustomRequestCommand()

WebInputStream& juce::WebInputStream::withCustomRequestCommand ( const String customRequestCommand)

Override the http command that is sent.

Returns a reference to itself so that several methods can be chained.

Note that this command will not change the way parameters are sent. This must be specified in the constructor.

Parameters
customRequestCommandthis string is the custom http request command such as POST or GET.

◆ withExtraHeaders()

WebInputStream& juce::WebInputStream::withExtraHeaders ( const String extraHeaders)

Add extra headers to http request.

Returns a reference to itself so that several methods can be chained.

Parameters
extraHeadersthis string is appended onto the headers that are used for the request. It must therefore be a valid set of HTML header directives, separated by newlines.

◆ withNumRedirectsToFollow()

WebInputStream& juce::WebInputStream::withNumRedirectsToFollow ( int  numRedirects)

Specify the number of redirects to be followed.

Returns a reference to itself so that several methods can be chained.

Parameters
numRedirectsspecifies the number of redirects that will be followed before returning a response (ignored for Android which follows up to 5 redirects)

Friends And Related Function Documentation

◆ Pimpl

friend class Pimpl
friend

Member Data Documentation

◆ hasCalledConnect

bool juce::WebInputStream::hasCalledConnect
private

◆ pimpl

Pimpl* const juce::WebInputStream::pimpl
private

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