ascii | 易学教程

Translating memory contents into a string via ASCII encoding

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问题 I have to translate some memory contents into a string, using ASCII encoding. For example: 0x6A636162 But I am not sure how to break that up, to be translated into ASCII. I think it has something to do with how many bits are in a char/digit, but I am not sure how to go about doing so (and of course, I would like to know more of the reasoning behind it, not just "how to do it"). 回答1: ASCII uses 7 bits to encode a character (http://en.wikipedia.org/wiki/ASCII). However, it's common to encode

IOS:Convert hex values from the characterstic.value result

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问题 i am able to retrieve value from the peripheral as hex value and i need to convert as per my requirement.[24/12/14 11:37:00 am] sonali_phatak: I can see that i have received proper response.from 01117100352e36302e313100000000e55a 01 - 01-start byte 11 - 17(Dec) - length of responce packet 71 - response ID 00 - Ignore this byte So now out of total length 17, first 4 bytes are header, last 2 bytes are CRC. We need to read remaining 11 bytes and convert them to ASCII. 35 - 5 2e - . 36 - 6 30 - 0

Check if NSData contains ASCII or UTF8 Encoding

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问题 I am retrieving HTML, containing UTF8 or ASCII encoded text. For most common use it is ASCII decoding that works to display the text right: NSString *responseString = [[NSString alloc] initWithData:responseData encoding:NSASCIIStringEncoding]; Now I have another HTML page with UTF8 encoding, so I have to use: NSString *responseString = [[NSString alloc] initWithData:responseData encoding:NSUTF8StringEncoding]; What kind of encoding I retrieve is random when loading websites. My question is,

Perl decimal to ASCII conversion

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问题 I am pulling SNMP information from an F5 LTM, and storing this information in a psql database. I need help converting the returned data in decimal format into ASCII characters. Here is an example of the information returned from the SNMP request: iso.3.6.1.4.1.3375.2.2.10.2.3.1.9.10.102.111.114.119.97.114.100.95.118.115 = Counter64: 0 In my script, I need to identify the different sections of this information: my ($prefix, $num, $char-len, $vs) = ($oid =~ /($vsTable)\.(\d+)\.(\d+)\.(.+)/);

ASCII码对照表包含二进制、十进制、十六进制

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　ASCII（American Standard Code for Information Interchange，美国信息互换标准代码，ASCⅡ）是基于拉丁字母的一套电脑编码系统。它主要用于显示现代英语和其他西欧语言。它是现今最通用的单字节编码系统，并等同于国际标准ISO/IEC 646。　　ASCII第一次以规范标准的型态发表是在1967年，最后一次更新则是在1986年，至今为止共定义了128个字符，其中33个字符无法显示（这是以现今操作系统为依归，但在DOS模式下可显示出一些诸如笑脸、扑克牌花式等8-bit符号），且这33个字符多数都已是陈废的控制字符，控制字符的用途主要是用来操控已经处理过的文字，在33个字符之外的是95个可显示的字符，包含用键盘敲下空白键所产生的空白字符也算1个可显示字符（显示为空白）。 ASCII控制字符二进制十进制十六进制缩写可以显示的表示法名称/意义 0000 0000 0 00 NUL ␀ 空字符（Null） 0000 0001 1 01 SOH ␁ 标题开始 0000 0010 2 02 STX ␂ 本文开始 0000 0011 3 03 ETX ␃ 本文结束 0000 0100 4 04 EOT ␄ 传输结束 0000 0101 5 05 ENQ ␅ 请求 0000 0110 6 06 ACK ␆ 确认回应 0000 0111 7

How can force the user/OS to input an Ascii string

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问题 This is an extended question of this one: Is std::string suppose to have only Ascii characters I want to build a simple console application that take an input from the user as set of characters. Those characters include 0->9 digits and a->z letters. I am dealing with input supposing that it is an Ascii. For example, I am using something like : static_cast<unsigned int>(my_char - '0') to get the number as unsigned int . How can I make this code cross-platform? How can tell that I want the

How do I properly work with unicode characters in python to keep from getting errors?

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问题 I'm working on a python plugin for Google Quick Search Box, and it's doing some odd things with non-ascii characters. It seems like the code works fine up until I try constructing a string containing the non-ascii characters (ü has been my test character). I am using the following code snippet for the construction, with new_task as the variable that is being input from GQSB. the_sig = ("%sapi_key%sauth_token%smethod%sname%sparse%stimeline%s" % (api_secret, api_key, the_token, method, new_task

Using m4 to convert a string to ASCII codepoints

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问题 This should be possible, but as I am a novice with m4, I'm not sure how to go about it, or how to write an algorithm to do so (in m4). edit: Just solved it, anyway for future reference, I have a series of characters, they need to be translated to their equivalent ASCII code points, e.g. ascii(-{COLON}-, -{:}-) => #define TKN_COLON 58 回答1: For the benefit of others interested in a pure m4 implementation I've managed to create the following conversion macro. It has to meddle with the quoting

Script to convert ASCII chars to “<Uxxx>” unicode notation

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问题 I'm doing some changes in Linux locale files /usr/share/i18n/locales (like pt_BR ), and it's required that format strings (like %d-%m-%Y %H:%M ) must be specified in Unicode, where each (in this case, ASCII) character is represented as <U00xx> . So a text like this: LC_TIME d_t_fmt "%a %d %b %Y %T %Z" d_fmt "%d-%m-%Y" t_fmt "%T" Must be: LC_TIME d_t_fmt "<U0025><U0061><U0020><U0025><U0064><U0020><U0025><U0062><U0020><U0025><U0059><U0020><U0025><U0054><U0020><U0025><U005A>" d_fmt "<U0025>

How do I emulate key function CTRL-B to a barcode

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问题 This is my first post on this website, can't seem to solve the problem. How do I emulate key function Ctrl + B to a barcode so i can scan the barcode with a scanner without pressing Ctrl + B . I've tried reading the ASCII Control Codes ASCII control codes Please help me. 回答1: As one of your tags demonstrates, you are already aware of the code 128 symbology. You will want to use the code128A start code (103) and the same character as a lower case 'b' in code128B (66). Finally, after adding