ascii | 易学教程

Remove ALL or particular Non printable character from column in mysql

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问题 I want to remove all OR particular non printable character from my column in mysql. I think this can be achieve using regexp_replace() function but how that I dont know. Non Printable characters has Ascii value from o to 31. I had Think one solution which is as below: IF I write the function that read all characters from the input string one by one and convert into ASCII. Then every-time I compare this Ascii value with input ascii value and if it matches then replace it and my function will

Assign 2 char to an int

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问题 I am trying to understand the outcome of this code: #include<iostream> using namespace std; int main() { int a = 'dd'; cout << a; return 0; } The result is 25700. How the compiler get this number? Thanks 回答1: The ascii code for 'd' is 0x64. The literal 'dd' was represented as 0x6464 by your compiler, which is 25700 when written in decimal notation. 回答2: 'dd' is a multi-character literal, its type is int and its value is implementation-defined. In many implementations, the value is calculated

Assign 2 char to an int

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Java - Convert a String of letters to an int of corresponding ascii?

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问题 I want to convert a String, lets say "abc" , to an int with the corresponding ascii: in this example, 979899 . I've run into two problems: 1) what I wrote only works for characters whose ascii is two characters long and 2) since these numbers get very big, I can't use longs and I'm having trouble utilizing BigIntegers. This is what I have so far: BigInteger mInt = BigInteger.valueOf(0L); for (int i = 0; i<mString.length(); i++) { mInt = mInt.add(BigInteger.valueOf( (long)(mString.charAt(i)

How to bind ascii stream to a prepared statement

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问题 I am testing fastload example code from an official teradata website . To err on the side of caution , I use the sample FastLoad1.csv located on their samples.jar here When I run this sample code, I get an error in this line pstmtFld.setAsciiStream(1, dataStream, -1); // This method is not implemented How must setAsciiStream be used with a prepared statement ? Am i using the setAsciiStream correctly ? Here is the error message in console Attempting connection to Teradata with FastLoadCSV.

jquery键盘事件

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1、keydown() keydown事件会在键盘按下时触发； 2、keyup() keyup事件会在按键释放时触发,也就是你按下键盘起来后的事件； 3、keypress() keypress事件会在敲击按键时触发,我们可以理解为按下并抬起同一个按键；示例代码 var eventHandle = function(evt) { console.log(evt.which, evt.type, event.keyCode); } $(document).on('keydown', eventHandle); $(document).on('keypress', eventHandle); $(document).on('keyup', eventHandle); 当按下键盘a时，先后触发了keydown，keypress，keyup三个事件；以上，通过evt.which, event.keyCode两种方式都可以获取ASCII码。要注意的是，keydown，keyup获取的小写字母的ASCII码，而keypress或取的是大写的字母的ASCII码；来源： https://www.cnblogs.com/wood2012/p/7896566.html

In which encoding is 0xDB a currency symbol?

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问题 I received files which, sadly, I cannot get info about how they were generated. I need to parse these files. The file is entirely ASCII besides for one character: 0xDB (in decimal it gives 219). Obviously (from looking at the file) this character is a currency symbol. I know it because: it is mandatory for these files to contain a currency symbol anywhere an amount appears there's no other currency symbol (neither $ nor euro nor nothing) nowhere in the files everytime that 0xDB appears it's

How do I convert filenames from unicode to ascii

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问题 I have a bunch of music files on a NTFS partition mounted on linux that have filenames with unicode characters. I'm having trouble writing a script to rename the files so that all of the file names use only ASCII characters. I think that using the iconv command should work, but I'm having trouble escaping the characters for the 'mv' command. EDIT: It doesn't matter if there isn't a direct translieration for the unicode chars. I guess that i'll just replace those with a "?" character. 回答1: I

Convert String of Hex to NSString of text?

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问题 I need to convert an NSString of hex values into an NSString of text (ASCII). For example, I need something like: "68 65 78 61 64 65 63 69 6d 61 6c" to be "hexadecimal" I have looked at and tweaked the code in this thread, but it's not working for me. It is only functional with one hex pair. Something to do with the spaces? Any tips or sample code is extremely appreciated. 回答1: Well I will modify the same thing for your purpose. NSString * str = @"68 65 78 61 64 65 63 69 6d 61 6c";

How to convert a string to ASCII value in PHP without ord()?

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问题 I am looking to convert a string say 'Hello' world to its ASCII value in php. But I don't want to use ord() . Are there any other solutions for printing ascii value without using ord() ? 回答1: unpack() Unpacks from a binary string into an array according to the given format. Use the format C* to return everything as what you'd get from ord() . print_r(unpack("C*", "Hello world")); Array ( [1] => 72 [2] => 101 [3] => 108 [4] => 108 [5] => 111 [6] => 32 [7] => 119 [8] => 111 [9] => 114 [10] =>