Titanium SDK

# Titanium.IOStream

IOStream is the interface that all stream types implement.

Availability
1.7
1.7
9.2.0
Extends
Titanium.Proxy

# Overview

See the Titanium.Stream module for related utility methods that support asynchronous I/O.

# Examples

# Write Data to a Stream

This example demonstrates writing data to a stream.

var outBuffer = Ti.createBuffer({data: "write me"});
// stream object could be socket, file, buffer or blob
var outStream = Ti.Stream.createStream({mode: Ti.Stream.MODE_WRITE});

var bytesWritten = outStream.write(outBuffer);  // writes entire buffer to stream
Ti.API.info("Bytes written:" + bytesWritten);  // should be 8

bytesWritten = outStream.write(outBuffer, 2, 5);  // only writes "ite m" to stream
Ti.API.info("Bytes written:" + bytesWritten);  // should be 5

# Read Data From a Stream

This shows a simple example of reading data from a stream, one buffer full at a time.

var size = 0;
// read data one buffer full at a time
while ((size = instream.read(buffer)) > -1) {
    // do something with the data here ...
    Ti.API.info("Read " + size + " bytes.");
}

# Read Data With Offset and Length

This example shows how to read data from a stream into a buffer. We assume that the inStream variable holds a previously initialized stream that contains the string, "World Titanium".

var inBuffer = Ti.createBuffer({ value: "Hello [           ]" });

// Read the first 6 bytes from the stream to the buffer, starting at position 10.
var bytesRead = inStream.read(inBuffer, 10, 6);

Ti.API.info("Bytes read: " + bytesRead);
Ti.API.info(inBuffer.toString());

// Read the next 8  bytes from the stream to the buffer, starting at position 8.
bytesRead = inStream.read(inBuffer, 8, 8);

Ti.API.info("Bytes read: " + bytesRead);
Ti.API.info(inBuffer.toString());

The second read overwrites the data from the first read, so the output looks like this:

[INFO] Bytes read: 6
[INFO] Hello [   World   ]
[INFO] Bytes read: 8
[INFO] Hello [ Titanium  ]

# Properties

# apiName READONLY

Availability
3.2.0
3.2.0
9.2.0
apiName :String

The name of the API that this proxy corresponds to.

The value of this property is the fully qualified name of the API. For example, Titanium.UI.Button returns Ti.UI.Button.

# bubbleParent

Availability
3.0.0
3.0.0
9.2.0
bubbleParent :Boolean

Indicates if the proxy will bubble an event to its parent.

Some proxies (most commonly views) have a relationship to other proxies, often established by the add() method. For example, for a button added to a window, a click event on the button would bubble up to the window. Other common parents are table sections to their rows, table views to their sections, and scrollable views to their views. Set this property to false to disable the bubbling to the proxy's parent.

Default: true

# lifecycleContainer

Availability
3.6.0
lifecycleContainer :Titanium.UI.Window | Titanium.UI.TabGroup

The Window or TabGroup whose Activity lifecycle should be triggered on the proxy.

If this property is set to a Window or TabGroup, then the corresponding Activity lifecycle event callbacks will also be called on the proxy. Proxies that require the activity lifecycle will need this property set to the appropriate containing Window or TabGroup.

# Methods

# addEventListener

Availability
1.7
1.7
9.2.0
addEventListener(name, callback) → void

Adds the specified callback as an event listener for the named event.

Parameters

Name Type Description
name String

Name of the event.

callback Callback<Titanium.Event>

Callback function to invoke when the event is fired.

Returns

Type
void

# applyProperties

Availability
3.0.0
3.0.0
9.2.0
applyProperties(props) → void

Applies the properties to the proxy.

Properties are supplied as a dictionary. Each key-value pair in the object is applied to the proxy such that myproxy[key] = value.

Parameters

Name Type Description
props Dictionary

A dictionary of properties to apply.

Returns

Type
void

# close

Availability
1.7
1.7
9.2.0
close() → void

Closes this stream.

Throws an exception on error.

Returns

Type
void

# fireEvent

Availability
1.7
1.7
9.2.0
fireEvent(name[, event]) → void

Fires a synthesized event to any registered listeners.

Parameters

Name Type Description
name String

Name of the event.

event Dictionary

A dictionary of keys and values to add to the Titanium.Event object sent to the listeners.

Returns

Type
void

# isReadable

Availability
1.7
1.7
9.2.0
isReadable() → Boolean

Indicates whether this stream is readable.

Returns

True if stream is readable, false otherwise.

Type
Boolean

# isWritable

Availability
1.7
1.7
9.2.0
isWritable() → Boolean

Indicates whether this stream is writable.

Returns

True if stream is writable, false otherwise.

Type
Boolean

# read

Availability
1.7
1.7
9.2.0
read(buffer[, offset[, length[, resultsCallback]]]) → Number

Reads data from this stream into a buffer.

Takes an optional resultsCallback function as the last argument. If specified, the operation is done asynchronously. If no callback is passed in, the operation is done synchronously.

If offset and length are specified, data is written into the buffer starting at position offset. Data is read from this stream until one of the following occurs:

  • the end of this stream is reached
  • the end of the buffer is reached
  • a total of length bytes have been read from the stream

If offset and length are omitted, data is written starting at the beginning of the buffer.

When called synchronously: returns the number of bytes read, or -1 if the end of stream was reached before any data was read.

Returns 0 when called asynchronously.

Throws an exception on error. For example, if the offset value is past the last byte of buffer.

Parameters

Name Type Description
buffer Titanium.Buffer

Buffer to read stream data into.

offset Number

Offset into the buffer to start writing stream data. If specified, length must also be specified.

length Number

Maximum number of bytes to read. If specified, offset must also be specified.

resultsCallback Callback<ReadCallbackArgs>

Function to call with the results of the read operation.

Returns

Number of bytes read.

Type
Number

# removeEventListener

Availability
1.7
1.7
9.2.0
removeEventListener(name, callback) → void

Removes the specified callback as an event listener for the named event.

Multiple listeners can be registered for the same event, so the callback parameter is used to determine which listener to remove.

When adding a listener, you must save a reference to the callback function in order to remove the listener later:

var listener = function() { Ti.API.info("Event listener called."); }
window.addEventListener('click', listener);

To remove the listener, pass in a reference to the callback function:

window.removeEventListener('click', listener);

Parameters

Name Type Description
name String

Name of the event.

callback Callback<Titanium.Event>

Callback function to remove. Must be the same function passed to addEventListener.

Returns

Type
void

# write

Availability
1.7
1.7
9.2.0
write(buffer[, offset[, length[, resultsCallback]]]) → Number

Writes data from a buffer to this stream.

Takes an optional resultsCallback function as the last argument. If specified, the operation is done asynchronously. If no callback is passed in, the operation is done synchronously.

If offset and length are specified, data is read from the buffer starting at offset. Bytes are read from the buffer and written to the stream until:

  • the end of the buffer is reached
  • length bytes have been written
  • the stream returns an error

If offset and length are omitted, all of the data in the buffer is written to this stream.

Returns the number of bytes actually written when called synchronously.

Returns 0 when called asynchronously.

Throws an exception if an error is encountered.

Parameters

Name Type Description
buffer Titanium.Buffer

Buffer to write to this stream.

offset Number

Offset in the buffer of the first byte to write to the stream. If specified, length must also be specified.

length Number

Maximum number of bytes to write to the stream. If specified, offset must also be specified.

resultsCallback Callback<WriteCallbackArgs>

Function to call with the results of the write operation.

Returns

Number of bytes written.

Type
Number

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