Thus UTF16 uses a variable number of code units to encode each code point.įinally, the most widespread encoding used for the external Unicode storage (e.g. UTF-32 is commonly used under Unix systems for internal representation of Unicode strings.Īnother very widespread standard is UTF-16 which is used by Microsoft Windows: it encodes the first (approximately) 64 thousands of Unicode code points (the BMP plane) using 16-bit code units (2 bytes) and uses a pair of 16-bit code units to encode the characters beyond this. (Note that even UTF-32 is still not completely trivial as the mapping is different for little and big-endian architectures). The simplest of them is UTF-32 where each code unit is composed by 32 bits (4 bytes) and each code point is always represented by a single code unit (fixed length encoding). The UTF or Unicode Transformation Formats are algorithms mapping the Unicode code points to code unit sequences. More precisely, a code unit is the minimal bit combination that can represent a unit of encoded text for processing or interchange. The other planes in fact contain mainly historic scripts, special-purpose characters or are unused.Ĭode points are represented in computer memory as a sequence of one or more code units, where a code unit is a unit of memory: 8, 16, or 32 bits. The BMP contains characters for all modern languages, and a large number of special characters. Planes are numbered from 0 to 16, where the first one is the BMP, or Basic Multilingual Plane.
The Unicode standard divides the space of all possible code points in planes a plane is a range of 65,536 (1000016) contiguous Unicode code points. In these cases a single "character" may be mapped to more than one code point or vice versa more than one character may be mapped to a single code point. Note that typically one character is assigned exactly one code point, but there are exceptions the so-called precomposed characters (see ) or the ligatures.
#Utf 8 converter for mac code manuals
Unicode assigns each character of almost any existing alphabet/script a number, which is called code point it's typically indicated in documentation manuals and in the Unicode website as U+xxxx where xxxx is an hexadecimal number. some of the possible glyphs for the capital letter 'A' are: Any character may have one or more glyph associated e.g. When working with Unicode, it's important to define the meaning of some terms.Ī glyph is a particular image (usually part of a font) that represents a character or part of a character. Moreover, any application reading files which it didn't produce or receiving data from the network from other services should be ready to deal with Unicode. įrom a practical point of view, using Unicode is almost a requirement when writing applications for international audience. More details about Unicode may be found at. This allows enough code points (see below for the definition) sufficient to encode all of the world languages at once.
the ASCII standard), by using 8, 16 or 32 bits for encoding each character. Unicode is a standard for character encoding which addresses the shortcomings of the previous standards (e.g. You can skip the first two sections if you're already familiar with Unicode and wish to jump directly in the details of its support in the library. Please see Unicode-related Changes for the details of these changes. Notice that Unicode support has changed radically in wxWidgets 3.0 and a lot of existing material pertaining to the previous versions of the library is not correct any more. This section describes how does wxWidgets support Unicode and how can it affect your programs.
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