nsIConverterOutputStream 编辑

xpcom/io/nsIConverterOutputStream.idlScriptable This interface allows writing strings to a stream, doing automatic character encoding conversion. 1.0 66 Introduced Gecko 1.8 Inherits from: nsIUnicharOutputStream Last changed in Gecko 1.8 (Firefox 1.5 / Thunderbird 1.5 / SeaMonkey 1.0)

Implemented by: @mozilla.org/intl/converter-output-stream;1. To create an instance, use:

var converterOutputStream = Components.classes["@mozilla.org/intl/converter-output-stream;1"]
                            .createInstance(Components.interfaces.nsIConverterOutputStream);

Method overview

void init(in nsIOutputStream aOutStream, in string aCharset, in unsigned long aBufferSize, in PRUnichar aReplacementCharacter);

Methods

init()

Initialize this stream. Must be called before any other method on this interface, or you will crash. The output stream passed to this method must not be null, or you will crash.

void init(
  in nsIOutputStream aOutStream,
  in string aCharset,
  in unsigned long aBufferSize,
  in PRUnichar aReplacementCharacter
);

Parameters

aOutStream

The underlying output stream to which the converted strings will be written.

aCharset

The character set to use for encoding the characters. A null charset will be interpreted as UTF-8.

aBufferSize

How many bytes to buffer. A value of 0 means that no bytes will be buffered. Implementations not supporting buffering may ignore this parameter.

aReplacementCharacter

The replacement character to use when an unsupported character is found. A value of 0x0000 will cause an exception to be thrown upon attempts to write unsupported characters.

Exceptions thrown

NS_ERROR_LOSS_OF_SIGNIFICANT_DATA

If aReplacementCharacter is not encodable in the selected character encoding and an attempt is made to write the character.

See also

• nsIConverterInputStream
• See Writing textual data for an example.