ASCII table and description
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ASCII table and description Extended ASCII Codes ASCII table 收藏
ASCII stands for American Standard Code for Information Interchange. Computers can only understand numbers, so an ASCII code is the numerical representation of a character such as 'a' or '@' or an action of some sort. ASCII was developed a long time ago and now the non-printing characters are rarely used for their original purpose. Below is the ASCII character table and this includes descriptions of the first 32 non-printing characters. ASCII was actually designed for use with teletypes and so the descriptions are somewhat obscure. If someone says they want your CV however in ASCII format, all this means is they want 'plain' text with no formatting such as tabs, bold or underscoring - the raw format that any computer can understand. This is usually so they can easily import the file into their own applications without issues. Notepad.exe creates ASCII text, or in MS Word you can save a file as 'text only'
因为1位二进制数可以表示(21=)2种状态:0、1;而2位二进制数可以表示(22)=4种状态:00、01、10、11;依次类推,7位二进制数可以表示(27=)128种状态,每种状态都唯一地编为一个7位的二进制码,对应一个字符(或控制码),这些码可以排列成一个十进制序号0~127。所以,7位ASCII码是用七位二进制数进行编码的,可以表示128个字符。
第0~32号及第127号(共34个)是控制字符或通讯专用字符,如控制符:LF(换行)、CR(回车)、FF(换页)、DEL(删除)、BEL(振铃)等;通讯专用字符:SOH(文头)、EOT(文尾)、ACK(确认)等;
第33~126号(共94个)是字符,其中第48~57号为0~9十个阿拉伯数字;65~90号为26个大写英文字母,97~122号为26个小写英文字母,其余为一些标点符号、运算符号等。
注意:在计算机的存储单元中,一个ASCII码值占一个字节(8个二进制位),其最高位(b7)用作奇偶校验位。所谓奇偶校验,是指在代码传送过程中用来检验是否出现错误的一种方法,一般分奇校验和偶校验两种。奇校验规定:正确的代码一个字节中1的个数必须是奇数,若非奇数,则在最高位b7添1;偶校验规定:正确的代码一个字节中1的个数必须是偶数,若非偶数,则在最高位b7添1。
回车键: VK_RETURN (13)
TAB键: VK_TAB (9)
Caps Lock键: VK_CAPITAL (20)
Shift键: VK_SHIFT ($10)
Ctrl键: VK_CONTROL (17)
Alt键: VK_MENU (18)
空格键: VK_SPACE ($20/32)
退格键: VK_BACK (8)
左徽标键: VK_LWIN (91)
右徽标键: VK_LWIN (92)
鼠标右键快捷键:VK_APPS (93)
Home键: VK_HOME (36)
Page Up: VK_PRIOR (33)
PageDown: VK_NEXT (34)
End键: VK_END (35)
Delete键: VK_DELETE (46)
方向键(↑): VK_UP (38)
方向键(→): VK_RIGHT (39)
方向键(↓): VK_DOWN (40)
F2键: VK_F2 (113)
F3键: VK_F3 (114)
F4键: VK_F4 (115)
F5键: VK_F5 (116)
F6键: VK_F6 (117)
F7键: VK_F7 (118)
F8键: VK_F8 (119)
F9键: VK_F9 (120)
F10键: VK_F10 (121)
F11键: VK_F11 (122)
F12键: VK_F12 (123)
小键盘0: VK_NUMPAD0 (96)
小键盘1: VK_NUMPAD0 (97)
小键盘2: VK_NUMPAD0 (98)
小键盘3: VK_NUMPAD0 (99)
小键盘4: VK_NUMPAD0 (100)
小键盘5: VK_NUMPAD0 (101)
小键盘6: VK_NUMPAD0 (102)
小键盘7: VK_NUMPAD0 (103)
小键盘8: VK_NUMPAD0 (104)
小键盘9: VK_NUMPAD0 (105)
小键盘.: VK_DECIMAL (110)
小键盘*: VK_MULTIPLY (106)
小键盘+: VK_MULTIPLY (107)
小键盘-: VK_SUBTRACT (109)
小键盘/: VK_DIVIDE (111)
Scroll Lock键: VK_SCROLL (145)
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