This article describes how to read textual data from streams, files and sockets.
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TEXT: Isaiah 61:1-2 SUBJECT: Christ in the Old Testament #28: The Preacher Today, with the Lord's blessing, we'll continue our study of Christ in the Old Testament. THE SERMON The text is one of the best known and most loved in all the Bible. WeChat 7.0.12 Free text messaging and free video calls with more than 300 million people. Now also available for Windows and Mac desktop computers. Download Specs What's New Alternatives 12.
In order to read textual data, you need to know which character encoding the data is in. Files and network sockets contain bytes, not characters - to give these bytes a meaning, you need to know the character encoding.
XXX: Document nsIUnicharStreamListener (gecko 1.8) XXX: Also document nsIStreamListener here?
Determining the character encoding of data
If you have a network channel (nsIChannel), you can try the contentCharset property of it. Note that not all channels know the character encoding of the data. You can fallback to the default character encoding stored in preferences (intl.charset.default, a localized pref value)
When reading from a file, the question is harder to answer. Telecharger photoshop mac. Using the system character encoding may work (XXX insert text how to get it), or again the default character encoding from preferences.
Converting read data
XXX: Document nsIUnicharStreamListener (gecko 1.8) XXX: Also document nsIStreamListener here?
Determining the character encoding of data
If you have a network channel (nsIChannel), you can try the contentCharset property of it. Note that not all channels know the character encoding of the data. You can fallback to the default character encoding stored in preferences (intl.charset.default, a localized pref value)
When reading from a file, the question is harder to answer. Telecharger photoshop mac. Using the system character encoding may work (XXX insert text how to get it), or again the default character encoding from preferences.
Converting read data
If you read data from nsIScriptableInputStream as described on the file I/O code snippets page, you can convert it to UTF-8
Gecko 1.8 and newer
Reading strings
Starting with Gecko 1.8 (SeaMonkey 1.0, Firefox 1.5), you can use nsIConverterInputStream to read strings from a stream (nsIInputStream). This work was done in bug 295047.
Usage:
Now you can read string from is:
To read the entire stream and do something with the data:
Don't forget to close the stream when you're done with it (is.close()). Not doing so can cause problems if you try to rename or delete the file at a later time on some platforms.
Note that you may get less characters than you asked for, especially (but not only) at the end of the file (stream).
Unsupported byte sequencesYou can specify what should happen with byte sequences that do not correspond to a valid character. The last (4th) argument to init specifies which character they get replaced with; nsIConverterInputStream.DEFAULT_REPLACEMENT_CHARACTER is U+FFFD REPLACEMENT CHARACTER, which is often a good choice.
If you do not want any replacement, you can specify 0x0000 as replacement character; that way, readString will throw an exception when reaching unsupported bytes. Roller coaster tycoon 3 for mac free.
Reading lines
The nsIUnicharLineInputStream interface provides an easy way to read entire lines from a unichar stream. It can be used like nsILineInputStream, except that it supports non-ASCII characters, and has no problems with charsets with embedded nulls (like UTF-16 and UTF-32).
It can be used like this:
The above example reads an entire stream until EOF. See nsIConverterInputStream for nsIConverterInputStream.init() arguments. Corel aftershot pro 3 6 0 6.
Earlier versions
Reading strings
Earlier versions of gecko do not provide easy ways to read unicode data from a stream. You will have to manually read a block of data and convert it using nsIScriptableUnicodeConverter.
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For example:
However, you must be aware that this method will not work for character encodings that have embedded null bytes, such as UTF-16 or UTF-32.
Reading Lines
There is no easy, general way to read a unicode line from a stream.
For the limited use case of reading lines from a local file, the following code using nsIScriptableUnicodeConverter works. This code will not work for character encodings that contain embedded nulls such as UTF-16 and UTF-32
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See also
