内容

• 公共类型
• 公共函数
• 静态公共成员
• 相关非成员
• 详细描述

QChar 类

The QChar class provides a 16-bit Unicode character. 更多...

头：	#include <QChar>
qmake:	QT += core

• 所有成员列表，包括继承成员
• 过时成员

注意： 此类的所有函数 可重入 .

公共类型

enum	Category { Mark_NonSpacing, Mark_SpacingCombining, Mark_Enclosing, Number_DecimalDigit, ..., Symbol_Other }
enum	Decomposition { NoDecomposition, Canonical, Circle, Compat, ..., Wide }
enum	Direction { DirAL, DirAN, DirB, DirBN, ..., DirWS }
enum	JoiningType { Joining_None, Joining_Causing, Joining_Dual, Joining_Right, Joining_Left, Joining_Transparent }
enum	Script { Script_Unknown, Script_Inherited, Script_Common, Script_Latin, ..., Script_SignWriting }
enum	SpecialCharacter { Null, Tabulation, LineFeed, CarriageReturn, ..., LastValidCodePoint }
enum	UnicodeVersion { Unicode_1_1, Unicode_2_0, Unicode_2_1_2, Unicode_3_0, ..., Unicode_Unassigned }

公共函数

	QChar ()
	QChar (ushort code )
	QChar (uchar cell , uchar row )
	QChar (short code )
	QChar (uint code )
	QChar (int code )
	QChar (SpecialCharacter ch )
	QChar (QLatin1Char ch )
	QChar (char ch )
	QChar (uchar ch )
类别	category () const
uchar	cell () const
unsigned char	combiningClass () const
QString	decomposition () const
Decomposition	decompositionTag () const
int	digitValue () const
方向	direction () const
bool	hasMirrored () const
bool	isDigit () const
bool	isHighSurrogate () const
bool	isLetter () const
bool	isLetterOrNumber () const
bool	isLowSurrogate () const
bool	isLower () const
bool	isMark () const
bool	isNonCharacter () const
bool	isNull () const
bool	isNumber () const
bool	isPrint () const
bool	isPunct () const
bool	isSpace () const
bool	isSurrogate () const
bool	isSymbol () const
bool	isTitleCase () const
bool	isUpper () const
JoiningType	joiningType () const
QChar	mirroredChar () const
uchar	row () const
Script	script () const
QChar	toCaseFolded () const
char	toLatin1 () const
QChar	toLower () const
QChar	toTitleCase () const
QChar	toUpper () const
ushort	unicode () const
ushort &	unicode ()
UnicodeVersion	unicodeVersion () const

静态公共成员

类别	category (uint ucs4 )
unsigned char	combiningClass (uint ucs4 )
UnicodeVersion	currentUnicodeVersion ()
QString	decomposition (uint ucs4 )
Decomposition	decompositionTag (uint ucs4 )
int	digitValue (uint ucs4 )
方向	direction (uint ucs4 )
QChar	fromLatin1 (char c )
bool	hasMirrored (uint ucs4 )
ushort	highSurrogate (uint ucs4 )
bool	isDigit (uint ucs4 )
bool	isHighSurrogate (uint ucs4 )
bool	isLetter (uint ucs4 )
bool	isLetterOrNumber (uint ucs4 )
bool	isLowSurrogate (uint ucs4 )
bool	isLower (uint ucs4 )
bool	isMark (uint ucs4 )
bool	isNonCharacter (uint ucs4 )
bool	isNumber (uint ucs4 )
bool	isPrint (uint ucs4 )
bool	isPunct (uint ucs4 )
bool	isSpace (uint ucs4 )
bool	isSurrogate (uint ucs4 )
bool	isSymbol (uint ucs4 )
bool	isTitleCase (uint ucs4 )
bool	isUpper (uint ucs4 )
JoiningType	joiningType (uint ucs4 )
ushort	lowSurrogate (uint ucs4 )
uint	mirroredChar (uint ucs4 )
bool	requiresSurrogates (uint ucs4 )
Script	script (uint ucs4 )
uint	surrogateToUcs4 (ushort high , ushort low )
uint	surrogateToUcs4 (QChar high , QChar low )
uint	toCaseFolded (uint ucs4 )
uint	toLower (uint ucs4 )
uint	toTitleCase (uint ucs4 )
uint	toUpper (uint ucs4 )
UnicodeVersion	unicodeVersion (uint ucs4 )

相关非成员

bool	operator!= (QChar c1 , QChar c2 )
bool	operator< (QChar c1 , QChar c2 )
QDataStream &	operator<< (QDataStream & out , QChar chr )
bool	operator<= (QChar c1 , QChar c2 )
bool	operator== (QChar c1 , QChar c2 )
bool	operator> (QChar c1 , QChar c2 )
bool	operator>= (QChar c1 , QChar c2 )
QDataStream &	operator>> (QDataStream & in , QChar & chr )

详细描述

The QChar class provides a 16-bit Unicode character.

在 Qt 中，Unicode 字符是没有任何标记 (或结构) 的 16 位实体。此类表示这种实体。它很轻量，所以可以在任何地方使用。大多数编译器视它像 unsigned short .

QChar provides a full complement of testing/classification functions, converting to and from other formats, converting from composed to decomposed Unicode, and trying to compare and case-convert if you ask it to.

The classification functions include functions like those in the standard C++ header <cctype> (formerly <ctype.h>), but operating on the full range of Unicode characters, not just for the ASCII range. They all return true if the character is a certain type of character; otherwise they return false. These classification functions are isNull () (返回 true 若字符为 \0)， isPrint () (true if the character is any sort of printable character, including whitespace), isPunct () (any sort of punctation), isMark () (Unicode 标记)， isLetter () (字母)， isNumber () (任意排序的数字字符，不仅仅 0-9)， isLetterOrNumber ()，和 isDigit () (decimal digits). All of these are wrappers around category () which return the Unicode-defined category of each character. Some of these also calculate the derived properties (for example isSpace () 返回 true if the character is of category Separator_* or an exceptional code point from Other_Control 类别)。

QChar 还提供 direction (), which indicates the "natural" writing direction of this character. The joiningType () function indicates how the character joins with it's neighbors (needed mostly for Arabic or Syriac) and finally hasMirrored (), which indicates whether the character needs to be mirrored when it is printed in it's "unnatural" writing direction.

合成的 Unicode 字符 (像 ring ) 可以被转换成分解 Unicode (a 之后紧跟 ring above) 通过使用 decomposition ().

In Unicode, comparison is not necessarily possible and case conversion is very difficult at best. Unicode, covering the "entire" world, also includes most of the world's case and sorting problems. operator==() and friends will do comparison based purely on the numeric Unicode value (code point) of the characters, and toUpper () 和 toLower () will do case changes when the character has a well-defined uppercase/lowercase equivalent. For locale-dependent comparisons, use QString::localeAwareCompare ().

转换函数包括 unicode () (到标量)、 toLatin1 () (到标量，但将所有非 Latin-1 字符转换成 0)、 row () (给出 Unicode 行)、 cell () (给出 Unicode 单元格)、 digitValue () (给出任意多数字字符的整数值)、及大量构造函数。

QChar provides constructors and cast operators that make it easy to convert to and from traditional 8-bit char 。若有定义 QT_NO_CAST_FROM_ASCII and QT_NO_CAST_TO_ASCII ，作为解释在 QString 文档编制，将需要明确调用 fromLatin1 ()，或使用 QLatin1Char , to construct a QChar from an 8-bit char ，和将需要调用 toLatin1 () 以获得 8 位值。

更多信息见 关于 Unicode 字符数据库 .

另请参阅 Unicode , QString ，和 QLatin1Char .

成员类型文档编制

enum QChar:: Category

此枚举映射 Unicode 字符类别。

以下是 Unicode 规范字符：

常量	值	描述
QChar::Mark_NonSpacing	0	Unicode 类名 Mn
QChar::Mark_SpacingCombining	1	Unicode 类名 Mc
QChar::Mark_Enclosing	2	Unicode 类名 Me
QChar::Number_DecimalDigit	3	Unicode 类名 Nd
QChar::Number_Letter	4	Unicode 类名 Nl
QChar::Number_Other	5	Unicode 类名 No
QChar::Separator_Space	6	Unicode 类名 Zs
QChar::Separator_Line	7	Unicode 类名 Zl
QChar::Separator_Paragraph	8	Unicode 类名 Zp
QChar::Other_Control	9	Unicode 类名 Cc
QChar::Other_Format	10	Unicode 类名 Cf
QChar::Other_Surrogate	11	Unicode 类名 Cs
QChar::Other_PrivateUse	12	Unicode 类名 Co
QChar::Other_NotAssigned	13	Unicode 类名 Cn

以下是 Unicode 情报类别：

常量	值	描述
QChar::Letter_Uppercase	14	Unicode 类名 Lu
QChar::Letter_Lowercase	15	Unicode 类名 Ll
QChar::Letter_Titlecase	16	Unicode 类名 Lt
QChar::Letter_Modifier	17	Unicode 类名 Lm
QChar::Letter_Other	18	Unicode 类名 Lo
QChar::Punctuation_Connector	19	Unicode 类名 Pc
QChar::Punctuation_Dash	20	Unicode 类名 Pd
QChar::Punctuation_Open	21	Unicode 类名 Ps
QChar::Punctuation_Close	22	Unicode 类名 Pe
QChar::Punctuation_InitialQuote	23	Unicode 类名 Pi
QChar::Punctuation_FinalQuote	24	Unicode 类名 Pf
QChar::Punctuation_Other	25	Unicode 类名 Po
QChar::Symbol_Math	26	Unicode 类名 Sm
QChar::Symbol_Currency	27	Unicode 类名 Sc
QChar::Symbol_Modifier	28	Unicode 类名 Sk
QChar::Symbol_Other	29	Unicode 类名 So

另请参阅 category ().

enum QChar:: Decomposition

此枚举类型定义 Unicode 分解属性。见 Unicode 标准 了解值的描述。

常量	值
QChar::NoDecomposition	0
QChar::Canonical	1
QChar::Circle	8
QChar::Compat	16
QChar::Final	6
QChar::Font	2
QChar::Fraction	17
QChar::Initial	4
QChar::Isolated	7
QChar::Medial	5
QChar::Narrow	13
QChar::NoBreak	3
QChar::Small	14
QChar::Square	15
QChar::Sub	10
QChar::Super	9
QChar::Vertical	11
QChar::Wide	12

另请参阅 decomposition ().

enum QChar:: Direction

此枚举类型定义 Unicode 方向属性。见 Unicode 标准 了解值的描述。

为符合 C/C++ 命名约定，在 Unicode 标准使用的代码前置 Dir。

常量	值	描述
QChar::DirAL	13
QChar::DirAN	5
QChar::DirB	7
QChar::DirBN	18
QChar::DirCS	6
QChar::DirEN	2
QChar::DirES	3
QChar::DirET	4
QChar::DirFSI	21	Since Qt 5.3
QChar::DirL	0
QChar::DirLRE	11
QChar::DirLRI	19	Since Qt 5.3
QChar::DirLRO	12
QChar::DirNSM	17
QChar::DirON	10
QChar::DirPDF	16
QChar::DirPDI	22	Since Qt 5.3
QChar::DirR	1
QChar::DirRLE	14
QChar::DirRLI	20	Since Qt 5.3
QChar::DirRLO	15
QChar::DirS	8
QChar::DirWS	9

另请参阅 direction ().

enum QChar:: JoiningType

从 5.3 起

此枚举类型定义 Unicode 联接类型属性。见 Unicode 标准 了解值的描述。

为符合 C/C++ 命名约定，在 Unicode 标准使用的代码前置 Joining_。

常量	值
QChar::Joining_None	0
QChar::Joining_Causing	1
QChar::Joining_Dual	2
QChar::Joining_Right	3
QChar::Joining_Left	4
QChar::Joining_Transparent	5

另请参阅 joiningType ().

enum QChar:: Script

此枚举类型定义 Unicode 脚本特性值。

Unicode 脚本特性值的有关细节，见 Unicode 标准附录 #24 .

为符合 C/C++ 命名约定，在 Unicode 标准使用的代码前置 Script_。

常量	值	描述
QChar::Script_Unknown	0	For unassigned, private-use, noncharacter, and surrogate code points.
QChar::Script_Inherited	1	For characters that may be used with multiple scripts and that inherit their script from the preceding characters. These include nonspacing marks, enclosing marks, and zero width joiner/non-joiner characters.
QChar::Script_Common	2	For characters that may be used with multiple scripts and that do not inherit their script from the preceding characters.
QChar::Script_Latin	3
QChar::Script_Greek	4
QChar::Script_Cyrillic	5
QChar::Script_Armenian	6
QChar::Script_Hebrew	7
QChar::Script_Arabic	8
QChar::Script_Syriac	9
QChar::Script_Thaana	10
QChar::Script_Devanagari	11
QChar::Script_Bengali	12
QChar::Script_Gurmukhi	13
QChar::Script_Gujarati	14
QChar::Script_Oriya	15
QChar::Script_Tamil	16
QChar::Script_Telugu	17
QChar::Script_Kannada	18
QChar::Script_Malayalam	19
QChar::Script_Sinhala	20
QChar::Script_Thai	21
QChar::Script_Lao	22
QChar::Script_Tibetan	23
QChar::Script_Myanmar	24
QChar::Script_Georgian	25
QChar::Script_Hangul	26
QChar::Script_Ethiopic	27
QChar::Script_Cherokee	28
QChar::Script_CanadianAboriginal	29
QChar::Script_Ogham	30
QChar::Script_Runic	31
QChar::Script_Khmer	32
QChar::Script_Mongolian	33
QChar::Script_Hiragana	34
QChar::Script_Katakana	35
QChar::Script_Bopomofo	36
QChar::Script_Han	37
QChar::Script_Yi	38
QChar::Script_OldItalic	39
QChar::Script_Gothic	40
QChar::Script_Deseret	41
QChar::Script_Tagalog	42
QChar::Script_Hanunoo	43
QChar::Script_Buhid	44
QChar::Script_Tagbanwa	45
QChar::Script_Coptic	46
QChar::Script_Limbu	47
QChar::Script_TaiLe	48
QChar::Script_LinearB	49
QChar::Script_Ugaritic	50
QChar::Script_Shavian	51
QChar::Script_Osmanya	52
QChar::Script_Cypriot	53
QChar::Script_Braille	54
QChar::Script_Buginese	55
QChar::Script_NewTaiLue	56
QChar::Script_Glagolitic	57
QChar::Script_Tifinagh	58
QChar::Script_SylotiNagri	59
QChar::Script_OldPersian	60
QChar::Script_Kharoshthi	61
QChar::Script_Balinese	62
QChar::Script_Cuneiform	63
QChar::Script_Phoenician	64
QChar::Script_PhagsPa	65
QChar::Script_Nko	66
QChar::Script_Sundanese	67
QChar::Script_Lepcha	68
QChar::Script_OlChiki	69
QChar::Script_Vai	70
QChar::Script_Saurashtra	71
QChar::Script_KayahLi	72
QChar::Script_Rejang	73
QChar::Script_Lycian	74
QChar::Script_Carian	75
QChar::Script_Lydian	76
QChar::Script_Cham	77
QChar::Script_TaiTham	78
QChar::Script_TaiViet	79
QChar::Script_Avestan	80
QChar::Script_EgyptianHieroglyphs	81
QChar::Script_Samaritan	82
QChar::Script_Lisu	83
QChar::Script_Bamum	84
QChar::Script_Javanese	85
QChar::Script_MeeteiMayek	86
QChar::Script_ImperialAramaic	87
QChar::Script_OldSouthArabian	88
QChar::Script_InscriptionalParthian	89
QChar::Script_InscriptionalPahlavi	90
QChar::Script_OldTurkic	91
QChar::Script_Kaithi	92
QChar::Script_Batak	93
QChar::Script_Brahmi	94
QChar::Script_Mandaic	95
QChar::Script_Chakma	96
QChar::Script_MeroiticCursive	97
QChar::Script_MeroiticHieroglyphs	98
QChar::Script_Miao	99
QChar::Script_Sharada	100
QChar::Script_SoraSompeng	101
QChar::Script_Takri	102
QChar::Script_CaucasianAlbanian	103
QChar::Script_BassaVah	104
QChar::Script_Duployan	105
QChar::Script_Elbasan	106
QChar::Script_Grantha	107
QChar::Script_PahawhHmong	108
QChar::Script_Khojki	109
QChar::Script_LinearA	110
QChar::Script_Mahajani	111
QChar::Script_Manichaean	112
QChar::Script_MendeKikakui	113
QChar::Script_Modi	114
QChar::Script_Mro	115
QChar::Script_OldNorthArabian	116
QChar::Script_Nabataean	117
QChar::Script_Palmyrene	118
QChar::Script_PauCinHau	119
QChar::Script_OldPermic	120
QChar::Script_PsalterPahlavi	121
QChar::Script_Siddham	122
QChar::Script_Khudawadi	123
QChar::Script_Tirhuta	124
QChar::Script_WarangCiti	125
QChar::Script_Ahom	126
QChar::Script_AnatolianHieroglyphs	127
QChar::Script_Hatran	128
QChar::Script_Multani	129
QChar::Script_OldHungarian	130
QChar::Script_SignWriting	131

该枚举在 Qt 5.1 引入或被修改。

另请参阅 script ().

enum QChar:: SpecialCharacter

常量	值	描述
QChar::Null	0x0000	A QChar 具有此值 isNull ().
QChar::Tabulation	0x0009	制表符。
QChar::LineFeed	0x000a
QChar::CarriageReturn	0x000d
QChar::Space	0x0020
QChar::Nbsp	0x00a0	不间断空格。
QChar::SoftHyphen	0x00ad
QChar::ReplacementCharacter	0xfffd	The character shown when a font has no glyph for a certain codepoint. A special question mark character is often used. Codecs use this codepoint when input data cannot be represented in Unicode.
QChar::ObjectReplacementCharacter	0xfffc	Used to represent an object such as an image when such objects cannot be presented.
QChar::ByteOrderMark	0xfeff
QChar::ByteOrderSwapped	0xfffe
QChar::ParagraphSeparator	0x2029
QChar::LineSeparator	0x2028
QChar::LastValidCodePoint	0x10ffff

enum QChar:: UnicodeVersion

指定哪个版本的 Unicode 标准 引入某个字符。

常量	值	描述
QChar::Unicode_1_1	1	版本 1.1
QChar::Unicode_2_0	2	版本 2.0
QChar::Unicode_2_1_2	3	版本 2.1.2
QChar::Unicode_3_0	4	版本 3.0
QChar::Unicode_3_1	5	版本 3.1
QChar::Unicode_3_2	6	版本 3.2
QChar::Unicode_4_0	7	版本 4.0
QChar::Unicode_4_1	8	版本 4.1
QChar::Unicode_5_0	9	版本 5.0
QChar::Unicode_5_1	10	版本 5.1
QChar::Unicode_5_2	11	版本 5.2
QChar::Unicode_6_0	12	版本 6.0
QChar::Unicode_6_1	13	版本 6.1
QChar::Unicode_6_2	14	版本 6.2
QChar::Unicode_6_3	15	Version 6.3 Since Qt 5.3
QChar::Unicode_7_0	16	Version 7.0 Since Qt 5.5
QChar::Unicode_8_0	17	Version 8.0 Since Qt 5.6
QChar::Unicode_Unassigned	0	The value is not assigned to any character in version 8.0 of Unicode.

另请参阅 unicodeVersion () 和 currentUnicodeVersion ().

成员函数文档编制

QChar:: QChar ()

Constructs a null QChar ('\0').

另请参阅 isNull ().

QChar:: QChar ( ushort code )

构造 QChar for the character with Unicode code point code .

QChar:: QChar ( uchar cell , uchar row )

构造 QChar for Unicode cell cell 按行 row .

另请参阅 cell () 和 row ().

QChar:: QChar ( short code )

构造 QChar for the character with Unicode code point code .

QChar:: QChar ( uint code )

构造 QChar for the character with Unicode code point code .

QChar:: QChar ( int code )

构造 QChar for the character with Unicode code point code .

QChar:: QChar ( SpecialCharacter ch )

构造 QChar for the predefined character value ch .

QChar:: QChar ( QLatin1Char ch )

构造 QChar corresponding to ASCII/Latin-1 character ch .

QChar:: QChar ( char ch )

构造 QChar corresponding to ASCII/Latin-1 character ch .

注意： 此构造函数不可用当 QT_NO_CAST_FROM_ASCII 有定义。

另请参阅 QT_NO_CAST_FROM_ASCII .

QChar:: QChar ( uchar ch )

构造 QChar corresponding to ASCII/Latin-1 character ch .

注意： 此构造函数不可用当 QT_NO_CAST_FROM_ASCII or QT_RESTRICTED_CAST_FROM_ASCII 有定义。

另请参阅 QT_NO_CAST_FROM_ASCII and QT_RESTRICTED_CAST_FROM_ASCII .

Category QChar:: category () const

返回字符类别。

[static] Category QChar:: category ( uint ucs4 )

这是重载函数。

返回的 UCS-4 编码字符类别指定通过 ucs4 .

uchar QChar:: cell () const

返回 Unicode 字符单元格 (最低有效字节)。

另请参阅 row ().

unsigned char QChar:: combiningClass () const

Returns the combining class for the character as defined in the Unicode standard. This is mainly useful as a positioning hint for marks attached to a base character.

The Qt text rendering engine uses this information to correctly position non-spacing marks around a base character.

[static] unsigned char QChar:: combiningClass ( uint ucs4 )

这是重载函数。

返回 UCS-4 编码字符组合类指定通过 ucs4 ，如 Unicode 标准定义的。

[static] UnicodeVersion QChar:: currentUnicodeVersion ()

返回最近支持的 Unicode 版本。

QString QChar:: decomposition () const

将字符分解成其组成部分。返回空字符串，若不存在分解。

[static] QString QChar:: decomposition ( uint ucs4 )

这是重载函数。

分解 UCS-4 编码字符指定通过 ucs4 成其组成部分。返回空字符串，若不存在分解。

Decomposition QChar:: decompositionTag () const

返回字符合成定义标签。返回 QChar::NoDecomposition 若不存在分解。

[static] Decomposition QChar:: decompositionTag ( uint ucs4 )

这是重载函数。

返回 UCS-4 编码字符合成定义标签指定通过 ucs4 。返回 QChar::NoDecomposition 若不存在分解。

int QChar:: digitValue () const

返回数字的数值，或 -1 若字符不是数字。

[static] int QChar:: digitValue ( uint ucs4 )

这是重载函数。

返回数字的数值指定通过 UCS-4 编码字符 ucs4 ，或 -1 若字符不是数字。

Direction QChar:: direction () const

返回字符方向。

[static] Direction QChar:: direction ( uint ucs4 )

这是重载函数。

返回 UCS-4 编码字符方向指定通过 ucs4 .

[static] QChar QChar:: fromLatin1 ( char c )

转换 Latin-1 字符 c 到其等价 QChar 。这主要用于非国际化软件。

替代是使用 QLatin1Char .

另请参阅 toLatin1 () 和 unicode ().

bool QChar:: hasMirrored () const

返回 true 当应反转字符时，若文本方向相反；否则返回 false .

快一点相当于 (ch. mirroredChar () != ch).

另请参阅 mirroredChar ().

[static] bool QChar:: hasMirrored ( uint ucs4 )

这是重载函数。

返回 true 若 UCS-4 编码字符指定通过 ucs4 应反转，若文本方向相反；否则返回 false .

快一点相当于 ( QChar::mirroredChar (ucs4) != ucs4).

该函数在 Qt 5.0 引入。

另请参阅 mirroredChar ().

[static] ushort QChar:: highSurrogate ( uint ucs4 )

Returns the high surrogate part of a UCS-4-encoded code point. The returned result is undefined if ucs4 is smaller than 0x10000.

bool QChar:: isDigit () const

返回 true 若字符是十进制数字 ( Number_DecimalDigit )；否则返回 false .

另请参阅 isNumber ().

[static] bool QChar:: isDigit ( uint ucs4 )

这是重载函数。

返回 true 若 UCS-4 编码字符指定通过 ucs4 是十进制数字 ( Number_DecimalDigit )；否则返回 false .

该函数在 Qt 5.0 引入。

另请参阅 isNumber ().

bool QChar:: isHighSurrogate () const

返回 true 若 QChar 是 UTF16 代理的高部分 (例如若其代码点在范围 [0xd800..0xdbff])；否则 false。

[static] bool QChar:: isHighSurrogate ( uint ucs4 )

这是重载函数。

返回 true 若 UCS-4 编码字符指定通过 ucs4 是 UTF16 代理的高部分 (例如若其代码点在范围 [0xd800..0xdbff])；否则 false。

bool QChar:: isLetter () const

返回 true 若字符是字母 (Letter_* 类别)；否则返回 false .

[static] bool QChar:: isLetter ( uint ucs4 )

这是重载函数。

返回 true 若 UCS-4 编码字符指定通过 ucs4 是字母 (Letter_* 类别)；否则返回 false .

该函数在 Qt 5.0 引入。

bool QChar:: isLetterOrNumber () const

返回 true if the character is a letter or number (Letter_* or Number_ * categories); otherwise returns false .

[static] bool QChar:: isLetterOrNumber ( uint ucs4 )

这是重载函数。

返回 true 若 UCS-4 编码字符指定通过 ucs4 is a letter or number (Letter_* or Number_ * categories); otherwise returns false .

该函数在 Qt 5.0 引入。

bool QChar:: isLowSurrogate () const

返回 true 若 QChar is the low part of a UTF16 surrogate (for example if its code point is in range [0xdc00..0xdfff]); false otherwise.

[static] bool QChar:: isLowSurrogate ( uint ucs4 )

这是重载函数。

返回 true 若 UCS-4 编码字符指定通过 ucs4 is the low part of a UTF16 surrogate (for example if its code point is in range [0xdc00..0xdfff]); false otherwise.

bool QChar:: isLower () const

返回 true 若字符是小写字母，例如 category () 是 Letter_Lowercase .

另请参阅 isUpper (), toLower ()，和 toUpper ().

[static] bool QChar:: isLower ( uint ucs4 )

这是重载函数。

返回 true 若 UCS-4 编码字符指定通过 ucs4 是小写字母，例如 category () 是 Letter_Lowercase .

该函数在 Qt 5.0 引入。

另请参阅 isUpper (), toLower ()，和 toUpper ().

bool QChar:: isMark () const

返回 true 若字符为标记 (Mark_* 类别)；否则返回 false .

见 QChar::Category 了解一般标记的更多信息。

[static] bool QChar:: isMark ( uint ucs4 )

这是重载函数。

返回 true 若 UCS-4 编码字符指定通过 ucs4 为标记 (Mark_* 类别)； false .

该函数在 Qt 5.0 引入。

bool QChar:: isNonCharacter () const

返回 true 若 QChar 为非字符；否则 false。

Unicode has a certain number of code points that are classified as "non-characters:" that is, they can be used for internal purposes in applications but cannot be used for text interchange. Those are the last two entries each Unicode Plane ([0xfffe..0xffff], [0x1fffe..0x1ffff], etc.) as well as the entries in range [0xfdd0..0xfdef].

该函数在 Qt 5.0 引入。

[static] bool QChar:: isNonCharacter ( uint ucs4 )

这是重载函数。

返回 true 若 UCS-4 编码字符指定通过 ucs4 为非字符；否则 false。

Unicode has a certain number of code points that are classified as "non-characters:" that is, they can be used for internal purposes in applications but cannot be used for text interchange. Those are the last two entries each Unicode Plane ([0xfffe..0xffff], [0x1fffe..0x1ffff], etc.) as well as the entries in range [0xfdd0..0xfdef].

该函数在 Qt 5.0 引入。

bool QChar:: isNull () const

返回 true if the character is the Unicode character 0x0000 ('\0'); otherwise returns false .

bool QChar:: isNumber () const

返回 true if the character is a number ( Number_ * categories, not just 0-9); otherwise returns false .

另请参阅 isDigit ().

[static] bool QChar:: isNumber ( uint ucs4 )

这是重载函数。

返回 true 若 UCS-4 编码字符指定通过 ucs4 is a number ( Number_ * categories, not just 0-9); otherwise returns false .

该函数在 Qt 5.0 引入。

另请参阅 isDigit ().

bool QChar:: isPrint () const

返回 true if the character is a printable character; otherwise returns false . This is any character not of category Other_ *.

Note that this gives no indication of whether the character is available in a particular font.

[static] bool QChar:: isPrint ( uint ucs4 )

这是重载函数。

返回 true 若 UCS-4 编码字符指定通过 ucs4 is a printable character; otherwise returns false . This is any character not of category Other_ *.

Note that this gives no indication of whether the character is available in a particular font.

该函数在 Qt 5.0 引入。

bool QChar:: isPunct () const

返回 true 若字符为标点符号标记 (Punctuation_* 类别)；否则返回 false .

[static] bool QChar:: isPunct ( uint ucs4 )

这是重载函数。

返回 true 若 UCS-4 编码字符指定通过 ucs4 为标点符号标记 (Punctuation_* 类别)；否则返回 false .

该函数在 Qt 5.0 引入。

bool QChar:: isSpace () const

返回 true if the character is a separator character (Separator_* categories or certain code points from Other_Control category); otherwise returns false .

[static] bool QChar:: isSpace ( uint ucs4 )

这是重载函数。

返回 true 若 UCS-4 编码字符指定通过 ucs4 is a separator character (Separator_* categories or certain code points from Other_Control category); otherwise returns false .

该函数在 Qt 5.0 引入。

bool QChar:: isSurrogate () const

返回 true 若 QChar contains a code point that is in either the high or the low part of the UTF-16 surrogate range (for example if its code point is in range [0xd800..0xdfff]); false otherwise.

该函数在 Qt 5.0 引入。

[static] bool QChar:: isSurrogate ( uint ucs4 )

这是重载函数。

返回 true 若 UCS-4 编码字符指定通过 ucs4 contains a code point that is in either the high or the low part of the UTF-16 surrogate range (for example if its code point is in range [0xd800..0xdfff]); false otherwise.

该函数在 Qt 5.0 引入。

bool QChar:: isSymbol () const

返回 true 若字符为符号 (Symbol_* 类别)；否则返回 false .

[static] bool QChar:: isSymbol ( uint ucs4 )

这是重载函数。

返回 true 若 UCS-4 编码字符指定通过 ucs4 为符号 (Symbol_* 类别)；否则返回 false .

该函数在 Qt 5.0 引入。

bool QChar:: isTitleCase () const

返回 true 若字符为标题大小写字母，例如 category () 是 Letter_Titlecase .

另请参阅 isLower (), toUpper (), toLower ()，和 toTitleCase ().

[static] bool QChar:: isTitleCase ( uint ucs4 )

这是重载函数。

返回 true 若 UCS-4 编码字符指定通过 ucs4 为标题大小写字母，例如 category () 是 Letter_Titlecase .

该函数在 Qt 5.0 引入。

另请参阅 isLower (), toUpper (), toLower ()，和 toTitleCase ().

bool QChar:: isUpper () const

返回 true 若字符为大写字母，例如 category () 是 Letter_Uppercase .

另请参阅 isLower (), toUpper ()，和 toLower ().

[static] bool QChar:: isUpper ( uint ucs4 )

这是重载函数。

返回 true 若 UCS-4 编码字符指定通过 ucs4 是大写字母，例如 category () 是 Letter_Uppercase .

该函数在 Qt 5.0 引入。

另请参阅 isLower (), toUpper ()，和 toLower ().

JoiningType QChar:: joiningType () const

Returns information about the joining type attributes of the character (needed for certain languages such as Arabic or Syriac).

该函数在 Qt 5.3 引入。

[static] JoiningType QChar:: joiningType ( uint ucs4 )

这是重载函数。

Returns information about the joining type attributes of the UCS-4-encoded character specified by ucs4 (needed for certain languages such as Arabic or Syriac).

该函数在 Qt 5.3 引入。

[static] ushort QChar:: lowSurrogate ( uint ucs4 )

Returns the low surrogate part of a UCS-4-encoded code point. The returned result is undefined if ucs4 is smaller than 0x10000.

QChar QChar:: mirroredChar () const

Returns the mirrored character if this character is a mirrored character; otherwise returns the character itself.

另请参阅 hasMirrored ().

[static] uint QChar:: mirroredChar ( uint ucs4 )

这是重载函数。

Returns the mirrored character if the UCS-4-encoded character specified by ucs4 is a mirrored character; otherwise returns the character itself.

另请参阅 hasMirrored ().

[static] bool QChar:: requiresSurrogates ( uint ucs4 )

返回 true 若 UCS-4 编码字符指定通过 ucs4 can be split into the high and low parts of a UTF16 surrogate (for example if its code point is greater than or equals to 0x10000); false otherwise.

uchar QChar:: row () const

Returns the row (most significant byte) of the Unicode character.

另请参阅 cell ().

Script QChar:: script () const

返回用于此字符的 Unicode 脚本特性值。

该函数在 Qt 5.1 引入。

[static] Script QChar:: script ( uint ucs4 )

这是重载函数。

Returns the Unicode script property value for the character specified in its UCS-4-encoded form as ucs4 .

该函数在 Qt 5.1 引入。

[static] uint QChar:: surrogateToUcs4 ( ushort high , ushort low )

转换 UTF16 代理对采用给定 high and low 值，到其 UCS-4 编码代码点。

[static] uint QChar:: surrogateToUcs4 ( QChar high , QChar low )

这是重载函数。

转换 UTF16 代理对 ( high , low ) 到其 UCS-4 编码代码点。

QChar QChar:: toCaseFolded () const

Returns the case folded equivalent of the character. For most Unicode characters this is the same as toLower ().

[static] uint QChar:: toCaseFolded ( uint ucs4 )

这是重载函数。

Returns the case folded equivalent of the UCS-4-encoded character specified by ucs4 . For most Unicode characters this is the same as toLower ().

char QChar:: toLatin1 () const

返回的 Latin-1 字符相当于 QChar ，或 0。这主要用于非国际化软件。

注意： It is not possible to distinguish a non-Latin-1 character from a Latin-1 0 (NUL) character. Prefer to use unicode (), which does not have this ambiguity.

另请参阅 unicode ().

QChar QChar:: toLower () const

Returns the lowercase equivalent if the character is uppercase or titlecase; otherwise returns the character itself.

[static] uint QChar:: toLower ( uint ucs4 )

这是重载函数。

Returns the lowercase equivalent of the UCS-4-encoded character specified by ucs4 if the character is uppercase or titlecase; otherwise returns the character itself.

QChar QChar:: toTitleCase () const

Returns the title case equivalent if the character is lowercase or uppercase; otherwise returns the character itself.

[static] uint QChar:: toTitleCase ( uint ucs4 )

这是重载函数。

Returns the title case equivalent of the UCS-4-encoded character specified by ucs4 if the character is lowercase or uppercase; otherwise returns the character itself.

QChar QChar:: toUpper () const

Returns the uppercase equivalent if the character is lowercase or titlecase; otherwise returns the character itself.

[static] uint QChar:: toUpper ( uint ucs4 )

这是重载函数。

返回 UCS-4 编码字符的大写等价，指定通过 ucs4 若字符为小写 (或标题大小写)；否则，返回字符自身。

ushort QChar:: unicode () const

返回数值 Unicode 值对于 QChar .

ushort &QChar:: unicode ()

返回数值 Unicode 值的引用对于 QChar .

UnicodeVersion QChar:: unicodeVersion () const

返回引入此字符的 Unicode 版本。

[static] UnicodeVersion QChar:: unicodeVersion ( uint ucs4 )

这是重载函数。

返回引入字符的 Unicode 版本, UCS-4 编码形式的指定为 ucs4 .

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bool operator!= ( QChar c1 , QChar c2 )

返回 true if c1 and c2 不是相同 Unicode 字符；否则返回 false .

bool operator< ( QChar c1 , QChar c2 )

返回 true 若数值 Unicode 值对于 c1 小于 c2 ；否则返回 false .

QDataStream & operator<< ( QDataStream & out , QChar chr )

写入字符 chr 到流 out .

另请参阅 序列化 Qt 数据类型 .

bool operator<= ( QChar c1 , QChar c2 )

返回 true 若数值 Unicode 值对于 c1 <= c2 ；否则返回 false .

bool operator== ( QChar c1 , QChar c2 )

返回 true if c1 and c2 是相同 Unicode 字符；否则返回 false .

bool operator> ( QChar c1 , QChar c2 )

返回 true 若数值 Unicode 值对于 c1 大于 c2 ；否则返回 false .

bool operator>= ( QChar c1 , QChar c2 )

返回 true 若数值 Unicode 值对于 c1 >= c2 ；否则返回 false .

QDataStream & operator>> ( QDataStream & in , QChar & chr )

读取字符从流 in 到字符 chr .

另请参阅 序列化 Qt 数据类型 .