QChar 類提供 16 位 Unicode 字符。 更多...
| 頭： | #include <QChar> |
| CMake: |
find_package(Qt6 REQUIRED COMPONENTS Core)
target_link_libraries(mytarget PRIVATE Qt6::Core) |
| qmake: | QT += core |
注意： 此類的所有函數 可重入 .
| enum | Category { Mark_NonSpacing, Mark_SpacingCombining, Mark_Enclosing, Number_DecimalDigit, Number_Letter, …, Symbol_Other } |
| enum | Decomposition { NoDecomposition, Canonical, Circle, Compat, Final, …, Wide } |
| enum | Direction { DirAL, DirAN, DirB, DirBN, DirCS, …, DirWS } |
| enum | JoiningType { Joining_None, Joining_Causing, Joining_Dual, Joining_Right, Joining_Left, Joining_Transparent } |
| enum | Script { Script_Unknown, Script_Inherited, Script_Common, Script_Adlam, Script_Ahom, …, Script_ZanabazarSquare } |
| enum | SpecialCharacter { Null, Tabulation, LineFeed, FormFeed, CarriageReturn, …, LastValidCodePoint } |
| enum | UnicodeVersion { Unicode_1_1, Unicode_2_0, Unicode_2_1_2, Unicode_3_0, Unicode_3_1, …, Unicode_Unassigned } |
| QChar () | |
| QChar (ushort code ) | |
| QChar (uchar cell , uchar row ) | |
| QChar (short code ) | |
| QChar (uint code ) | |
| QChar (int code ) | |
| QChar (QChar::SpecialCharacter ch ) | |
| QChar (QLatin1Char ch ) | |
| QChar (char16_t ch ) | |
| QChar (wchar_t ch ) | |
| QChar (char ch ) | |
| QChar (uchar ch ) | |
| QChar::Category | category () const |
| uchar | cell () const |
| unsigned char | combiningClass () const |
| QString | decomposition () const |
| QChar::Decomposition | decompositionTag () const |
| int | digitValue () const |
| QChar::Direction | 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 |
| QChar::JoiningType | joiningType () const |
| QChar | mirroredChar () const |
| uchar | row () const |
| QChar::Script | script () const |
| QChar | toCaseFolded () const |
| char | toLatin1 () const |
| QChar | toLower () const |
| QChar | toTitleCase () const |
| QChar | toUpper () const |
| char16_t | unicode () const |
| char16_t & | unicode () |
| QChar::UnicodeVersion | unicodeVersion () const |
| QChar::Category | category (char32_t ucs4 ) |
| unsigned char | combiningClass (char32_t ucs4 ) |
| QChar::UnicodeVersion | currentUnicodeVersion () |
| QString | decomposition (char32_t ucs4 ) |
| QChar::Decomposition | decompositionTag (char32_t ucs4 ) |
| int | digitValue (char32_t ucs4 ) |
| QChar::Direction | direction (char32_t ucs4 ) |
| QChar | fromLatin1 (char c ) |
| QChar | fromUcs2 (char16_t c ) |
| R | fromUcs4 (char32_t c ) |
| bool | hasMirrored (char32_t ucs4 ) |
| char16_t | highSurrogate (char32_t ucs4 ) |
| bool | isDigit (char32_t ucs4 ) |
| bool | isHighSurrogate (char32_t ucs4 ) |
| bool | isLetter (char32_t ucs4 ) |
| bool | isLetterOrNumber (char32_t ucs4 ) |
| bool | isLowSurrogate (char32_t ucs4 ) |
| bool | isLower (char32_t ucs4 ) |
| bool | isMark (char32_t ucs4 ) |
| bool | isNonCharacter (char32_t ucs4 ) |
| bool | isNumber (char32_t ucs4 ) |
| bool | isPrint (char32_t ucs4 ) |
| bool | isPunct (char32_t ucs4 ) |
| bool | isSpace (char32_t ucs4 ) |
| bool | isSurrogate (char32_t ucs4 ) |
| bool | isSymbol (char32_t ucs4 ) |
| bool | isTitleCase (char32_t ucs4 ) |
| bool | isUpper (char32_t ucs4 ) |
| QChar::JoiningType | joiningType (char32_t ucs4 ) |
| char16_t | lowSurrogate (char32_t ucs4 ) |
| char32_t | mirroredChar (char32_t ucs4 ) |
| bool | requiresSurrogates (char32_t ucs4 ) |
| QChar::Script | script (char32_t ucs4 ) |
| char32_t | surrogateToUcs4 (char16_t high , char16_t low ) |
| char32_t | surrogateToUcs4 (QChar high , QChar low ) |
| char32_t | toCaseFolded (char32_t ucs4 ) |
| char32_t | toLower (char32_t ucs4 ) |
| char32_t | toTitleCase (char32_t ucs4 ) |
| char32_t | toUpper (char32_t ucs4 ) |
| QChar::UnicodeVersion | unicodeVersion (char32_t ucs4 ) |
| 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 ) |
| QT_IMPLICIT_QCHAR_CONSTRUCTION |
在 Qt 中，Unicode 字符是沒有任何標記 (或結構) 的 16 位實體。此類錶示這種實體。它很輕量，所以可以在任何地方使用。大多數編譯器視它像
unsigned short
.
QChar 提供完全互補的測試/分類函數、轉換到/來自其它格式、從將閤成 Unicode 轉換為分解 Unicode、及試著比較和大小寫轉換，若要求的話。
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
() (返迴
true
若字符為 \0)，
isPrint
() (true if the character is any sort of printable character, including whitespace),
isPunct
() (any sort of punctation),
isMark
() (Unicode 標記)，
isLetter
() (字母)，
isNumber
() (任意排序的數字字符，不僅僅 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
() 返迴
true
if the character is of category Separator_* or an exceptional code point from
Other_Control
類彆)。
QChar 還提供 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.
閤成的 Unicode 字符 (像 ring ) 可以被轉換成分解 Unicode (a 之後緊跟 ring above) 通過使用 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 ().
轉換函數包括 unicode () (到標量)、 toLatin1 () (到標量，但將所有非 Latin-1 字符轉換成 0)、 row () (給齣 Unicode 行)、 cell () (給齣 Unicode 單元格)、 digitValue () (給齣任意多數字字符的整數值)、及大量構造函數。
QChar 提供構造函數和鑄造運算符，使之易於轉換到和轉換自傳統 8 位
char
。若有定義
QT_NO_CAST_FROM_ASCII
and
QT_NO_CAST_TO_ASCII
，如闡述在
QString
文檔編製，將需要明確調用
fromLatin1
()，或使用
QLatin1Char
，以構造 QChar 從 8 位
char
，和將需要調用
toLatin1
() 以獲得 8 位值。
Starting with Qt 6.0, most QChar constructors are
explicit
. This is done to avoid dangerous mistakes when accidentally mixing integral types and strings. You can opt-out (and make these constructors implicit) by defining the macro
QT_IMPLICIT_QCHAR_CONSTRUCTION
.
更多信息見 關於 Unicode 字符數據庫 .
另請參閱 Unicode , QString ，和 QLatin1Char .
此枚舉映射 Unicode 字符類彆。
以下是 Unicode 規範字符：
| 常量 | 值 | 描述 |
|---|---|---|
QChar::Mark_NonSpacing
|
0
|
Unicode 類名 Mn |
QChar::Mark_SpacingCombining
|
1
|
Unicode 類名 Mc |
QChar::Mark_Enclosing
|
2
|
Unicode 類名 Me |
QChar::Number_DecimalDigit
|
3
|
Unicode 類名 Nd |
QChar::Number_Letter
|
4
|
Unicode 類名 Nl |
QChar::Number_Other
|
5
|
Unicode 類名 No |
QChar::Separator_Space
|
6
|
Unicode 類名 Zs |
QChar::Separator_Line
|
7
|
Unicode 類名 Zl |
QChar::Separator_Paragraph
|
8
|
Unicode 類名 Zp |
QChar::Other_Control
|
9
|
Unicode 類名 Cc |
QChar::Other_Format
|
10
|
Unicode 類名 Cf |
QChar::Other_Surrogate
|
11
|
Unicode 類名 Cs |
QChar::Other_PrivateUse
|
12
|
Unicode 類名 Co |
QChar::Other_NotAssigned
|
13
|
Unicode 類名 Cn |
以下是 Unicode 情報類彆：
| 常量 | 值 | 描述 |
|---|---|---|
QChar::Letter_Uppercase
|
14
|
Unicode 類名 Lu |
QChar::Letter_Lowercase
|
15
|
Unicode 類名 Ll |
QChar::Letter_Titlecase
|
16
|
Unicode 類名 Lt |
QChar::Letter_Modifier
|
17
|
Unicode 類名 Lm |
QChar::Letter_Other
|
18
|
Unicode 類名 Lo |
QChar::Punctuation_Connector
|
19
|
Unicode 類名 Pc |
QChar::Punctuation_Dash
|
20
|
Unicode 類名 Pd |
QChar::Punctuation_Open
|
21
|
Unicode 類名 Ps |
QChar::Punctuation_Close
|
22
|
Unicode 類名 Pe |
QChar::Punctuation_InitialQuote
|
23
|
Unicode 類名 Pi |
QChar::Punctuation_FinalQuote
|
24
|
Unicode 類名 Pf |
QChar::Punctuation_Other
|
25
|
Unicode 類名 Po |
QChar::Symbol_Math
|
26
|
Unicode 類名 Sm |
QChar::Symbol_Currency
|
27
|
Unicode 類名 Sc |
QChar::Symbol_Modifier
|
28
|
Unicode 類名 Sk |
QChar::Symbol_Other
|
29
|
Unicode 類名 So |
另請參閱 category ().
This enum type defines the Unicode decomposition attributes. See the Unicode 標準 瞭解值的描述。
| 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
|
另請參閱 decomposition ().
此枚舉類型定義 Unicode 方嚮屬性。見 Unicode 標準 瞭解值的描述。
為符閤 C/C++ 命名約定，在 Unicode 標準使用的代碼前置 Dir。
| 常量 | 值 |
|---|---|
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 (since Qt 5.3)
|
21
|
QChar::DirL
|
0
|
QChar::DirLRE
|
11
|
QChar::DirLRI (since Qt 5.3)
|
19
|
QChar::DirLRO
|
12
|
QChar::DirNSM
|
17
|
QChar::DirON
|
10
|
QChar::DirPDF
|
16
|
QChar::DirPDI (since Qt 5.3)
|
22
|
QChar::DirR
|
1
|
QChar::DirRLE
|
14
|
QChar::DirRLI (since Qt 5.3)
|
20
|
QChar::DirRLO
|
15
|
QChar::DirS
|
8
|
QChar::DirWS
|
9
|
另請參閱 direction ().
從 5.3 起
This enum type defines the Unicode joining type attributes. See the Unicode 標準 瞭解值的描述。
為符閤 C/C++ 命名約定，在 Unicode 標準使用的代碼前置 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
|
另請參閱 joiningType ().
此枚舉類型定義 Unicode 腳本特性值。
Unicode 腳本特性值的有關細節，見 Unicode 標準附錄 #24 .
為符閤 C/C++ 命名約定，在 Unicode 標準使用的代碼前置 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_Adlam (since Qt 5.11)
|
132
|
|
QChar::Script_Ahom (since Qt 5.6)
|
126
|
|
QChar::Script_AnatolianHieroglyphs (since Qt 5.6)
|
127
|
|
QChar::Script_Arabic
|
8
|
|
QChar::Script_Armenian
|
6
|
|
QChar::Script_Avestan
|
80
|
|
QChar::Script_Balinese
|
62
|
|
QChar::Script_Bamum
|
84
|
|
QChar::Script_BassaVah (since Qt 5.5)
|
104
|
|
QChar::Script_Batak
|
93
|
|
QChar::Script_Bengali
|
12
|
|
QChar::Script_Bhaiksuki (since Qt 5.11)
|
133
|
|
QChar::Script_Bopomofo
|
36
|
|
QChar::Script_Brahmi
|
94
|
|
QChar::Script_Braille
|
54
|
|
QChar::Script_Buginese
|
55
|
|
QChar::Script_Buhid
|
44
|
|
QChar::Script_CanadianAboriginal
|
29
|
|
QChar::Script_Carian
|
75
|
|
QChar::Script_CaucasianAlbanian (since Qt 5.5)
|
103
|
|
QChar::Script_Chakma
|
96
|
|
QChar::Script_Cham
|
77
|
|
QChar::Script_Cherokee
|
28
|
|
QChar::Script_Chorasmian (since Qt 5.15)
|
153
|
|
QChar::Script_Coptic
|
46
|
|
QChar::Script_Cuneiform
|
63
|
|
QChar::Script_Cypriot
|
53
|
|
QChar::Script_CyproMinoan (since Qt 6.3)
|
157
|
|
QChar::Script_Cyrillic
|
5
|
|
QChar::Script_Deseret
|
41
|
|
QChar::Script_Devanagari
|
11
|
|
QChar::Script_DivesAkuru (since Qt 5.15)
|
154
|
|
QChar::Script_Dogra (since Qt 5.15)
|
142
|
|
QChar::Script_Duployan (since Qt 5.5)
|
105
|
|
QChar::Script_EgyptianHieroglyphs
|
81
|
|
QChar::Script_Elbasan (since Qt 5.5)
|
106
|
|
QChar::Script_Elymaic (since Qt 5.15)
|
149
|
|
QChar::Script_Ethiopic
|
27
|
|
QChar::Script_Georgian
|
25
|
|
QChar::Script_Glagolitic
|
57
|
|
QChar::Script_Gothic
|
40
|
|
QChar::Script_Grantha (since Qt 5.5)
|
107
|
|
QChar::Script_Greek
|
4
|
|
QChar::Script_Gujarati
|
14
|
|
QChar::Script_GunjalaGondi (since Qt 5.15)
|
143
|
|
QChar::Script_Gurmukhi
|
13
|
|
QChar::Script_Han
|
37
|
|
QChar::Script_Hangul
|
26
|
|
QChar::Script_HanifiRohingya (since Qt 5.15)
|
144
|
|
QChar::Script_Hanunoo
|
43
|
|
QChar::Script_Hatran (since Qt 5.6)
|
128
|
|
QChar::Script_Hebrew
|
7
|
|
QChar::Script_Hiragana
|
34
|
|
QChar::Script_ImperialAramaic
|
87
|
|
QChar::Script_InscriptionalPahlavi
|
90
|
|
QChar::Script_InscriptionalParthian
|
89
|
|
QChar::Script_Javanese
|
85
|
|
QChar::Script_Kaithi
|
92
|
|
QChar::Script_Kannada
|
18
|
|
QChar::Script_Katakana
|
35
|
|
QChar::Script_Kawi (since Qt 6.5)
|
162
|
|
QChar::Script_KayahLi
|
72
|
|
QChar::Script_Kharoshthi
|
61
|
|
QChar::Script_KhitanSmallScript (since Qt 5.15)
|
155
|
|
QChar::Script_Khmer
|
32
|
|
QChar::Script_Khojki (since Qt 5.5)
|
109
|
|
QChar::Script_Khudawadi (since Qt 5.5)
|
123
|
|
QChar::Script_Lao
|
22
|
|
QChar::Script_Latin
|
3
|
|
QChar::Script_Lepcha
|
68
|
|
QChar::Script_Limbu
|
47
|
|
QChar::Script_LinearA (since Qt 5.5)
|
110
|
|
QChar::Script_LinearB
|
49
|
|
QChar::Script_Lisu
|
83
|
|
QChar::Script_Lycian
|
74
|
|
QChar::Script_Lydian
|
76
|
|
QChar::Script_Mahajani (since Qt 5.5)
|
111
|
|
QChar::Script_Makasar (since Qt 5.15)
|
145
|
|
QChar::Script_Malayalam
|
19
|
|
QChar::Script_Mandaic
|
95
|
|
QChar::Script_Manichaean (since Qt 5.5)
|
112
|
|
QChar::Script_Marchen (since Qt 5.11)
|
134
|
|
QChar::Script_MasaramGondi (since Qt 5.11)
|
138
|
|
QChar::Script_Medefaidrin (since Qt 5.15)
|
146
|
|
QChar::Script_MeeteiMayek
|
86
|
|
QChar::Script_MendeKikakui (since Qt 5.5)
|
113
|
|
QChar::Script_MeroiticCursive
|
97
|
|
QChar::Script_MeroiticHieroglyphs
|
98
|
|
QChar::Script_Miao
|
99
|
|
QChar::Script_Modi (since Qt 5.5)
|
114
|
|
QChar::Script_Mongolian
|
33
|
|
QChar::Script_Mro (since Qt 5.5)
|
115
|
|
QChar::Script_Multani (since Qt 5.6)
|
129
|
|
QChar::Script_Myanmar
|
24
|
|
QChar::Script_Nabataean (since Qt 5.5)
|
117
|
|
QChar::Script_NagMundari (since Qt 6.3)
|
163
|
|
QChar::Script_Nandinagari (since Qt 5.15)
|
150
|
|
QChar::Script_Newa (since Qt 5.11)
|
135
|
|
QChar::Script_NewTaiLue
|
56
|
|
QChar::Script_Nko
|
66
|
|
QChar::Script_Nushu (since Qt 5.11)
|
139
|
|
QChar::Script_NyiakengPuachueHmong (since Qt 5.15)
|
151
|
|
QChar::Script_Ogham
|
30
|
|
QChar::Script_OlChiki
|
69
|
|
QChar::Script_OldHungarian (since Qt 5.6)
|
130
|
|
QChar::Script_OldItalic
|
39
|
|
QChar::Script_OldNorthArabian (since Qt 5.5)
|
116
|
|
QChar::Script_OldPermic (since Qt 5.5)
|
120
|
|
QChar::Script_OldPersian
|
60
|
|
QChar::Script_OldSogdian (since Qt 5.15)
|
147
|
|
QChar::Script_OldSouthArabian
|
88
|
|
QChar::Script_OldTurkic
|
91
|
|
QChar::Script_OldUyghur (since Qt 6.3)
|
158
|
|
QChar::Script_Oriya
|
15
|
|
QChar::Script_Osage (since Qt 5.11)
|
136
|
|
QChar::Script_Osmanya
|
52
|
|
QChar::Script_PahawhHmong (since Qt 5.5)
|
108
|
|
QChar::Script_Palmyrene (since Qt 5.5)
|
118
|
|
QChar::Script_PauCinHau (since Qt 5.5)
|
119
|
|
QChar::Script_PhagsPa
|
65
|
|
QChar::Script_Phoenician
|
64
|
|
QChar::Script_PsalterPahlavi (since Qt 5.5)
|
121
|
|
QChar::Script_Rejang
|
73
|
|
QChar::Script_Runic
|
31
|
|
QChar::Script_Samaritan
|
82
|
|
QChar::Script_Saurashtra
|
71
|
|
QChar::Script_Sharada
|
100
|
|
QChar::Script_Shavian
|
51
|
|
QChar::Script_Siddham (since Qt 5.5)
|
122
|
|
QChar::Script_SignWriting (since Qt 5.6)
|
131
|
|
QChar::Script_Sinhala
|
20
|
|
QChar::Script_Sogdian (since Qt 5.15)
|
148
|
|
QChar::Script_SoraSompeng
|
101
|
|
QChar::Script_Soyombo (since Qt 5.11)
|
140
|
|
QChar::Script_Sundanese
|
67
|
|
QChar::Script_SylotiNagri
|
59
|
|
QChar::Script_Syriac
|
9
|
|
QChar::Script_Tagalog
|
42
|
|
QChar::Script_Tagbanwa
|
45
|
|
QChar::Script_TaiLe
|
48
|
|
QChar::Script_TaiTham
|
78
|
|
QChar::Script_TaiViet
|
79
|
|
QChar::Script_Takri
|
102
|
|
QChar::Script_Tamil
|
16
|
|
QChar::Script_Tangut (since Qt 5.11)
|
137
|
|
QChar::Script_Tangsa (since Qt 6.3)
|
159
|
|
QChar::Script_Telugu
|
17
|
|
QChar::Script_Thaana
|
10
|
|
QChar::Script_Thai
|
21
|
|
QChar::Script_Tibetan
|
23
|
|
QChar::Script_Tifinagh
|
58
|
|
QChar::Script_Tirhuta (since Qt 5.5)
|
124
|
|
QChar::Script_Toto (since Qt 6.3)
|
160
|
|
QChar::Script_Ugaritic
|
50
|
|
QChar::Script_Vai
|
70
|
|
QChar::Script_Vithkuqi (since Qt 6.3)
|
161
|
|
QChar::Script_Wancho (since Qt 5.15)
|
152
|
|
QChar::Script_WarangCiti (since Qt 5.5)
|
125
|
|
QChar::Script_Yezidi (since Qt 5.15)
|
156
|
|
QChar::Script_Yi
|
38
|
|
QChar::Script_ZanabazarSquare (since Qt 5.11)
|
141
|
另請參閱 script ().
| 常量 | 值 | 描述 |
|---|---|---|
QChar::Null
|
0x0000
|
A QChar 具有此值 isNull (). |
QChar::Tabulation
|
0x0009
|
製錶符。 |
QChar::LineFeed
|
0x000a
|
|
QChar::FormFeed
|
0x000c
|
|
QChar::CarriageReturn
|
0x000d
|
|
QChar::Space
|
0x0020
|
|
QChar::Nbsp
|
0x00a0
|
不間斷空格。 |
QChar::SoftHyphen
|
0x00ad
|
|
QChar::ReplacementCharacter
|
0xfffd
|
展示字符，當對於某個代碼點字體沒有字形時。經常使用特殊 ? (問號) 字符。編解碼器使用此代碼點，當輸入數據無法以 Unicode 錶示時。 |
QChar::ObjectReplacementCharacter
|
0xfffc
|
用於錶示無法呈現的那些對象 (譬如：圖像)。 |
QChar::ByteOrderMark
|
0xfeff
|
|
QChar::ByteOrderSwapped
|
0xfffe
|
|
QChar::ParagraphSeparator
|
0x2029
|
|
QChar::LineSeparator
|
0x2028
|
|
QChar::VisualTabCharacter (since Qt 6.2)
|
0x2192
|
Used to represent a tabulation as a horizontal arrow. |
QChar::LastValidCodePoint
|
0x10ffff
|
指定哪個版本的 Unicode 標準 引入某個字符。
| 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 (since Qt 5.3)
|
15
|
Version 6.3 |
QChar::Unicode_7_0 (since Qt 5.5)
|
16
|
Version 7.0 |
QChar::Unicode_8_0 (since Qt 5.6)
|
17
|
Version 8.0 |
QChar::Unicode_9_0 (since Qt 5.11)
|
18
|
Version 9.0 |
QChar::Unicode_10_0 (since Qt 5.11)
|
19
|
Version 10.0 |
QChar::Unicode_11_0 (since Qt 5.15)
|
20
|
Version 11.0 |
QChar::Unicode_12_0 (since Qt 5.15)
|
21
|
Version 12.0 |
QChar::Unicode_12_1 (since Qt 5.15)
|
22
|
Version 12.1 |
QChar::Unicode_13_0 (since Qt 5.15)
|
23
|
Version 13.0 |
QChar::Unicode_14_0 (since Qt 6.3)
|
24
|
Version 14.0 |
QChar::Unicode_15_0 (since Qt 6.5)
|
25
|
Version 15.0 |
QChar::Unicode_Unassigned
|
0
|
The value is not assigned to any character in version 8.0 of Unicode. |
另請參閱 unicodeVersion () 和 currentUnicodeVersion ().
[constexpr]
QChar::
QChar
()
構造 null QChar('\0')。
另請參閱 isNull ().
[constexpr]
QChar::
QChar
(
ushort
code
)
構造 QChar 為字符具有 Unicode 代碼點 code .
[constexpr]
QChar::
QChar
(
uchar
cell
,
uchar
row
)
構造 QChar 為 Unicode 單元格 cell 按行 row .
[constexpr]
QChar::
QChar
(
short
code
)
構造 QChar 為字符具有 Unicode 代碼點 code .
[constexpr]
QChar::
QChar
(
uint
code
)
構造 QChar 為字符具有 Unicode 代碼點 code .
[constexpr]
QChar::
QChar
(
int
code
)
構造 QChar 為字符具有 Unicode 代碼點 code .
[constexpr]
QChar::
QChar
(
QChar::SpecialCharacter
ch
)
構造 QChar 為預定義字符值 ch .
[constexpr]
QChar::
QChar
(
QLatin1Char
ch
)
構造的 QChar 對應 ASCII/Latin-1 字符 ch .
[constexpr]
QChar::
QChar
(
char16_t
ch
)
構造的 QChar 對應 UTF-16 字符 ch .
[constexpr]
QChar::
QChar
(
wchar_t
ch
)
構造的 QChar 對應寬字符 ch .
注意： 此構造函數隻可用於 Windows。
[constexpr]
QChar::
QChar
(
char
ch
)
構造的 QChar 對應 ASCII/Latin-1 字符 ch .
注意：
此構造函數不可用當
QT_NO_CAST_FROM_ASCII
有定義。
另請參閱 QT_NO_CAST_FROM_ASCII .
[constexpr]
QChar::
QChar
(
uchar
ch
)
構造的 QChar 對應 ASCII/Latin-1 字符 ch .
注意：
此構造函數不可用當
QT_NO_CAST_FROM_ASCII
or
QT_RESTRICTED_CAST_FROM_ASCII
有定義。
另請參閱 QT_NO_CAST_FROM_ASCII and QT_RESTRICTED_CAST_FROM_ASCII .
返迴字符類彆。
[static]
QChar::Category
QChar::
category
(
char32_t
ucs4
)
這是重載函數。
返迴的 UCS-4 編碼字符類彆指定通過 ucs4 .
注意：
Before Qt 6, this function took a
uint
自變量。
[constexpr]
uchar
QChar::
cell
() const
返迴 Unicode 字符單元格 (最低有效字節)。
另請參閱 row ().
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
(
char32_t
ucs4
)
這是重載函數。
返迴 UCS-4 編碼字符組閤類指定通過 ucs4 ，如 Unicode 標準定義的。
注意：
Before Qt 6, this function took a
uint
自變量。
[static]
QChar::UnicodeVersion
QChar::
currentUnicodeVersion
()
返迴最近支持的 Unicode 版本。
將字符分解成其組成部分。返迴空字符串，若不存在分解。
[static]
QString
QChar::
decomposition
(
char32_t
ucs4
)
這是重載函數。
分解 UCS-4 編碼字符指定通過 ucs4 成其組成部分。返迴空字符串，若不存在分解。
注意：
Before Qt 6, this function took a
uint
自變量。
返迴字符閤成定義標簽。返迴 QChar::NoDecomposition 若不存在分解。
[static]
QChar::Decomposition
QChar::
decompositionTag
(
char32_t
ucs4
)
這是重載函數。
返迴 UCS-4 編碼字符閤成定義標簽指定通過 ucs4 。返迴 QChar::NoDecomposition 若不存在分解。
注意：
Before Qt 6, this function took a
uint
自變量。
返迴數字的數值，或 -1 若字符不是數字。
[static]
int
QChar::
digitValue
(
char32_t
ucs4
)
這是重載函數。
返迴數字的數值指定通過 UCS-4 編碼字符 ucs4 ，或 -1 若字符不是數字。
注意：
Before Qt 6, this function took a
uint
自變量。
返迴字符方嚮。
[static]
QChar::Direction
QChar::
direction
(
char32_t
ucs4
)
這是重載函數。
返迴 UCS-4 編碼字符方嚮指定通過 ucs4 .
注意：
Before Qt 6, this function took a
uint
自變量。
[static constexpr]
QChar
QChar::
fromLatin1
(
char
c
)
轉換 Latin-1 字符 c 到其等價 QChar 。這主要用於非國際化軟件。
替代是使用 QLatin1Char .
另請參閱 toLatin1 () 和 unicode ().
[static constexpr, since 6.0]
QChar
QChar::
fromUcs2
(
char16_t
c
)
構造 QChar from UTF-16 character c .
該函數在 Qt 6.0 引入。
另請參閱 fromUcs4 ().
[static constexpr, since 6.0]
R
QChar::
fromUcs4
(
char32_t
c
)
Returns an anonymous struct that
char16_t chars[2]
array,
若
c
requires surrogates,
chars[0]
contains the high surrogate and
chars[1]
the low surrogate, and the
QStringView
has size 2. Otherwise,
chars[0]
包含
c
and
chars[1]
is
null
，和
QStringView
has size 1.
This allows easy use of the result:
QString s; s += QChar::fromUcs4(ch);
for (char16_t c16 : QChar::fromUcs4(ch)) use(c16);
該函數在 Qt 6.0 引入。
另請參閱 fromUcs2 () 和 requiresSurrogates ().
返迴
true
當應反轉字符時，若文本方嚮相反；否則返迴
false
.
快一點相當於 (ch. mirroredChar () != ch).
另請參閱 mirroredChar ().
[static]
bool
QChar::
hasMirrored
(
char32_t
ucs4
)
這是重載函數。
返迴
true
若 UCS-4 編碼字符指定通過
ucs4
應反轉，若文本方嚮相反；否則返迴
false
.
快一點相當於 ( QChar::mirroredChar (ucs4) != ucs4).
注意：
Before Qt 6, this function took a
uint
自變量。
另請參閱 mirroredChar ().
[static constexpr]
char16_t
QChar::
highSurrogate
(
char32_t
ucs4
)
Returns the high surrogate part of a UCS-4-encoded code point. The returned result is undefined if ucs4 is smaller than 0x10000.
注意：
Before Qt 6, this function took a
uint
argument and returned
ushort
.
[constexpr]
bool
QChar::
isDigit
() const
返迴
true
若字符是十進製數字 (
Number_DecimalDigit
)；否則返迴
false
.
另請參閱 isNumber ().
[static constexpr]
bool
QChar::
isDigit
(
char32_t
ucs4
)
這是重載函數。
返迴
true
若 UCS-4 編碼字符指定通過
ucs4
是十進製數字 (
Number_DecimalDigit
)；否則返迴
false
.
注意：
Before Qt 6, this function took a
uint
自變量。
另請參閱 isNumber ().
[constexpr]
bool
QChar::
isHighSurrogate
() const
返迴
true
若
QChar
是 UTF16 代理的高部分 (例如：若其代碼點在範圍 [0xd800..0xdbff])；否則 false。
[static constexpr]
bool
QChar::
isHighSurrogate
(
char32_t
ucs4
)
這是重載函數。
返迴
true
若 UCS-4 編碼字符指定通過
ucs4
是 UTF16 代理的高部分 (例如：若其代碼點在範圍 [0xd800..0xdbff])；否則 false。
注意：
Before Qt 6, this function took a
uint
自變量。
[constexpr]
bool
QChar::
isLetter
() const
返迴
true
若字符是字母 (Letter_* 類彆)；否則返迴
false
.
[static constexpr]
bool
QChar::
isLetter
(
char32_t
ucs4
)
這是重載函數。
返迴
true
若 UCS-4 編碼字符指定通過
ucs4
是字母 (Letter_* 類彆)；否則返迴
false
.
注意：
Before Qt 6, this function took a
uint
自變量。
[constexpr]
bool
QChar::
isLetterOrNumber
() const
返迴
true
if the character is a letter or number (Letter_* or Number_* categories); otherwise returns
false
.
[static constexpr]
bool
QChar::
isLetterOrNumber
(
char32_t
ucs4
)
這是重載函數。
返迴
true
若 UCS-4 編碼字符指定通過
ucs4
is a letter or number (Letter_* or Number_* categories); otherwise returns
false
.
注意：
Before Qt 6, this function took a
uint
自變量。
[constexpr]
bool
QChar::
isLowSurrogate
() const
返迴
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 constexpr]
bool
QChar::
isLowSurrogate
(
char32_t
ucs4
)
這是重載函數。
返迴
true
若 UCS-4 編碼字符指定通過
ucs4
is the low part of a UTF16 surrogate (for example if its code point is in range [0xdc00..0xdfff]); false otherwise.
注意：
Before Qt 6, this function took a
uint
自變量。
[constexpr]
bool
QChar::
isLower
() const
返迴
true
若字符是小寫字母，例如
category
() 是
Letter_Lowercase
.
另請參閱 isUpper (), toLower ()，和 toUpper ().
[static constexpr]
bool
QChar::
isLower
(
char32_t
ucs4
)
這是重載函數。
返迴
true
若 UCS-4 編碼字符指定通過
ucs4
是小寫字母，例如
category
() 是
Letter_Lowercase
.
注意：
Before Qt 6, this function took a
uint
自變量。
另請參閱 isUpper (), toLower ()，和 toUpper ().
返迴
true
若字符為標記 (Mark_* 類彆)；否則返迴
false
.
見 QChar::Category 瞭解一般標記的更多信息。
[static]
bool
QChar::
isMark
(
char32_t
ucs4
)
這是重載函數。
返迴
true
若 UCS-4 編碼字符指定通過
ucs4
為標記 (Mark_* 類彆)；
false
.
注意：
Before Qt 6, this function took a
uint
自變量。
[constexpr]
bool
QChar::
isNonCharacter
() const
返迴
true
若
QChar
為非字符；否則 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].
[static constexpr]
bool
QChar::
isNonCharacter
(
char32_t
ucs4
)
這是重載函數。
返迴
true
若 UCS-4 編碼字符指定通過
ucs4
為非字符；否則 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].
注意：
Before Qt 6, this function took a
uint
自變量。
[constexpr]
bool
QChar::
isNull
() const
返迴
true
if the character is the Unicode character 0x0000 ('\0'); otherwise returns
false
.
[constexpr]
bool
QChar::
isNumber
() const
返迴
true
if the character is a number (Number_* categories, not just 0-9); otherwise returns
false
.
另請參閱 isDigit ().
[static constexpr]
bool
QChar::
isNumber
(
char32_t
ucs4
)
這是重載函數。
返迴
true
若 UCS-4 編碼字符指定通過
ucs4
is a number (Number_* categories, not just 0-9); otherwise returns
false
.
注意：
Before Qt 6, this function took a
uint
自變量。
另請參閱 isDigit ().
返迴
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
(
char32_t
ucs4
)
這是重載函數。
返迴
true
若 UCS-4 編碼字符指定通過
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.
注意：
Before Qt 6, this function took a
uint
自變量。
返迴
true
若字符為標點符號標記 (Punctuation_* 類彆)；否則返迴
false
.
[static]
bool
QChar::
isPunct
(
char32_t
ucs4
)
這是重載函數。
返迴
true
若 UCS-4 編碼字符指定通過
ucs4
為標點符號標記 (Punctuation_* 類彆)；否則返迴
false
.
注意：
Before Qt 6, this function took a
uint
自變量。
[constexpr]
bool
QChar::
isSpace
() const
返迴
true
if the character is a separator character (Separator_* categories or certain code points from
Other_Control
category); otherwise returns
false
.
[static constexpr]
bool
QChar::
isSpace
(
char32_t
ucs4
)
這是重載函數。
返迴
true
若 UCS-4 編碼字符指定通過
ucs4
is a separator character (Separator_* categories or certain code points from
Other_Control
category); otherwise returns
false
.
注意：
Before Qt 6, this function took a
uint
自變量。
[constexpr]
bool
QChar::
isSurrogate
() const
返迴
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.
[static constexpr]
bool
QChar::
isSurrogate
(
char32_t
ucs4
)
這是重載函數。
返迴
true
若 UCS-4 編碼字符指定通過
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.
注意：
Before Qt 6, this function took a
uint
自變量。
返迴
true
若字符為符號 (Symbol_* 類彆)；否則返迴
false
.
[static]
bool
QChar::
isSymbol
(
char32_t
ucs4
)
這是重載函數。
返迴
true
若 UCS-4 編碼字符指定通過
ucs4
為符號 (Symbol_* 類彆)；否則返迴
false
.
注意：
Before Qt 6, this function took a
uint
自變量。
[constexpr]
bool
QChar::
isTitleCase
() const
返迴
true
若字符為標題大小寫字母，例如
category
() 是
Letter_Titlecase
.
另請參閱 isLower (), toUpper (), toLower ()，和 toTitleCase ().
[static constexpr]
bool
QChar::
isTitleCase
(
char32_t
ucs4
)
這是重載函數。
返迴
true
若 UCS-4 編碼字符指定通過
ucs4
為標題大小寫字母，例如
category
() 是
Letter_Titlecase
.
注意：
Before Qt 6, this function took a
uint
自變量。
另請參閱 isLower (), toUpper (), toLower ()，和 toTitleCase ().
[constexpr]
bool
QChar::
isUpper
() const
返迴
true
若字符為大寫字母，例如
category
() 是
Letter_Uppercase
.
另請參閱 isLower (), toUpper ()，和 toLower ().
[static constexpr]
bool
QChar::
isUpper
(
char32_t
ucs4
)
這是重載函數。
返迴
true
若 UCS-4 編碼字符指定通過
ucs4
是大寫字母，例如
category
() 是
Letter_Uppercase
.
注意：
Before Qt 6, this function took a
uint
自變量。
另請參閱 isLower (), toUpper ()，和 toLower ().
Returns information about the joining type attributes of the character (needed for certain languages such as Arabic or Syriac).
[static]
QChar::JoiningType
QChar::
joiningType
(
char32_t
ucs4
)
這是重載函數。
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).
注意：
Before Qt 6, this function took a
uint
自變量。
[static constexpr]
char16_t
QChar::
lowSurrogate
(
char32_t
ucs4
)
Returns the low surrogate part of a UCS-4-encoded code point. The returned result is undefined if ucs4 is smaller than 0x10000.
注意：
Before Qt 6, this function took a
uint
argument and returned
ushort
.
Returns the mirrored character if this character is a mirrored character; otherwise returns the character itself.
另請參閱 hasMirrored ().
[static]
char32_t
QChar::
mirroredChar
(
char32_t
ucs4
)
這是重載函數。
Returns the mirrored character if the UCS-4-encoded character specified by ucs4 is a mirrored character; otherwise returns the character itself.
注意：
Before Qt 6, this function took a
uint
argument and returned
uint
.
另請參閱 hasMirrored ().
[static constexpr]
bool
QChar::
requiresSurrogates
(
char32_t
ucs4
)
返迴
true
若 UCS-4 編碼字符指定通過
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.
注意：
Before Qt 6, this function took a
uint
自變量。
[constexpr]
uchar
QChar::
row
() const
Returns the row (most significant byte) of the Unicode character.
另請參閱 cell ().
返迴用於此字符的 Unicode 腳本特性值。
[static]
QChar::Script
QChar::
script
(
char32_t
ucs4
)
這是重載函數。
Returns the Unicode script property value for the character specified in its UCS-4-encoded form as ucs4 .
注意：
Before Qt 6, this function took a
uint
自變量。
[static constexpr]
char32_t
QChar::
surrogateToUcs4
(
char16_t
high
,
char16_t
low
)
轉換 UTF16 代理對采用給定 high and low 值，到其 UCS-4 編碼代碼點。
注意：
Before Qt 6, this function took
ushort
arguments and returned
uint
.
[static constexpr]
char32_t
QChar::
surrogateToUcs4
(
QChar
high
,
QChar
low
)
這是重載函數。
轉換 UTF16 代理對 ( high , low ) 到其 UCS-4 編碼代碼點。
注意：
Before Qt 6, this function returned
uint
.
Returns the case folded equivalent of the character. For most Unicode characters this is the same as toLower ().
[static]
char32_t
QChar::
toCaseFolded
(
char32_t
ucs4
)
這是重載函數。
Returns the case folded equivalent of the UCS-4-encoded character specified by ucs4 . For most Unicode characters this is the same as toLower ().
注意：
Before Qt 6, this function took a
uint
argument and returned
uint
.
[constexpr]
char
QChar::
toLatin1
() const
返迴的 Latin-1 字符相當於 QChar ，或 0。這主要用於非國際化軟件。
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.
另請參閱 unicode ().
Returns the lowercase equivalent if the character is uppercase or titlecase; otherwise returns the character itself.
[static]
char32_t
QChar::
toLower
(
char32_t
ucs4
)
這是重載函數。
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.
注意：
Before Qt 6, this function took a
uint
argument and returned
uint
.
Returns the title case equivalent if the character is lowercase or uppercase; otherwise returns the character itself.
[static]
char32_t
QChar::
toTitleCase
(
char32_t
ucs4
)
這是重載函數。
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.
注意：
Before Qt 6, this function took a
uint
argument and returned
uint
.
Returns the uppercase equivalent if the character is lowercase or titlecase; otherwise returns the character itself.
[static]
char32_t
QChar::
toUpper
(
char32_t
ucs4
)
這是重載函數。
返迴 UCS-4 編碼字符的大寫等價，指定通過 ucs4 若字符為小寫 (或標題大小寫)；否則，返迴字符自身。
注意：
Before Qt 6, this function took a
uint
argument and returned
uint
.
[constexpr]
char16_t
QChar::
unicode
() const
返迴數值 Unicode 值對於 QChar .
[constexpr]
char16_t
&QChar::
unicode
()
返迴數值 Unicode 值的引用對於 QChar .
返迴引入此字符的 Unicode 版本。
[static]
QChar::UnicodeVersion
QChar::
unicodeVersion
(
char32_t
ucs4
)
這是重載函數。
返迴引入字符的 Unicode 版本, UCS-4 編碼形式的指定為 ucs4 .
注意：
Before Qt 6, this function took a
uint
自變量。
[constexpr]
bool
operator!=
(
QChar
c1
,
QChar
c2
)
返迴
true
if
c1
and
c2
不是相同 Unicode 字符；否則返迴
false
.
[constexpr]
bool
operator<
(
QChar
c1
,
QChar
c2
)
返迴
true
若數值 Unicode 值對於
c1
小於
c2
；否則返迴
false
.
寫入字符 chr 到流 out .
另請參閱 序列化 Qt 數據類型 .
[constexpr]
bool
operator<=
(
QChar
c1
,
QChar
c2
)
返迴
true
若數值 Unicode 值對於
c1
<=
c2
；否則返迴
false
.
[constexpr]
bool
operator==
(
QChar
c1
,
QChar
c2
)
返迴
true
if
c1
and
c2
是相同 Unicode 字符；否則返迴
false
.
[constexpr]
bool
operator>
(
QChar
c1
,
QChar
c2
)
返迴
true
若數值 Unicode 值對於
c1
大於
c2
；否則返迴
false
.
[constexpr]
bool
operator>=
(
QChar
c1
,
QChar
c2
)
返迴
true
若數值 Unicode 值對於
c1
>=
c2
；否則返迴
false
.
讀取字符從流 in 到字符 chr .
另請參閱 序列化 Qt 數據類型 .
[since 6.0]
QT_IMPLICIT_QCHAR_CONSTRUCTION
Defining this macro makes certain QChar constructors implicit rather than explicit. This is done to enforce safe conversions:
QString str = getString();
if (str == 123) {
// Oops, meant str == "123". By default does not compile,
// *unless* this macro is defined, in which case, it's interpreted
// as `if (str == QChar(123))`, that is, `if (str == '{')`.
// Likely, not what we meant.
}
This macro is provided to keep existing code working; it is recommended to instead use explicit conversions and/or QLatin1Char . For instance:
QChar c1 = 'x'; // OK, unless QT_NO_CAST_FROM_ASCII is defined QChar c2 = u'x'; // always OK, recommended QChar c3 = QLatin1Char('x'); // always OK, recommended // from int to 1 UTF-16 code unit: must guarantee that the input is <= 0xFFFF QChar c4 = 120; // compile error, unless QT_IMPLICIT_QCHAR_CONSTRUCTION is defined QChar c5(120); // OK (direct initialization) auto c6 = QChar(120); // ditto // from int/char32_t to 1/2 UTF-16 code units: // 𝄞 'MUSICAL SYMBOL G CLEF' (U+1D11E) auto c7 = QChar(0x1D11E); // compiles, but undefined behavior at runtime auto c8 = QChar::fromUcs4(0x1D11E); // always OK auto c9 = QChar::fromUcs4(U'\U0001D11E'); // always OK // => use c8/c9 as QStringView objects
This macro was introduced in Qt 6.0.
另請參閱 QLatin1Char , QChar::fromUcs4 ，和 QT_NO_CAST_FROM_ASCII .