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Unicode与UTF-8互转(C语言实现) - C/C++ - 清泛网 - 专注C/C++及内核技术
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ASCII码一共规定了128个字符的编码, 比如空格"SPACE"是32(二进制00100000), 大写的
字母A是65(二进制01000001). 这128个符号(包括32个不能打印出来的控制符号), 只占用
了一个字节的后面7位, 最前面的1位统一规定为0.
1.2 非ASCII编码
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Objective-C: difference between id and void *
... will cause premature reaping of objects if _superPrivateDoNotTouch is actually an object. Don't do that.
attempting to invoke a method on a reference of void * type will barf up a compiler warning.
attempting to invoke a method on an id type will only warn if the method being called has not been d...
Collect successive pairs from a stream
...eamEx library which extends standard streams provides a pairMap method for all stream types. For primitive streams it does not change the stream type, but can be used to make some calculations. Most common usage is to calculate differences:
int[] pairwiseDiffs = IntStreamEx.of(input).pairMap((a, b)...
Most efficient way to remove special characters from string
I want to remove all special characters from a string. Allowed characters are A-Z (uppercase or lowercase), numbers (0-9), underscore (_), or the dot sign (.).
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Drop multiple tables in one shot in mysql
...e A has two children B and C. Then we can use the following syntax to drop all tables.
DROP TABLE IF EXISTS B,C,A;
This can be placed in the beginning of the script instead of individually dropping each table.
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How to convert a byte array to a hex string in Java?
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From the discussion here, and especially this answer, this is the function I currently use:
private static final char[] HEX_ARRAY = "0123456789ABCDEF".toCharArray();
public static String bytesToHex(byte[] bytes) {
char[] hexChars = new char[bytes.length * 2...
Prevent direct access to a php include file
...eople the trouble of Googling, if you're using Apache, put this in a file called ".htaccess" in the directory you don't want to be accessible:
Deny from all
If you actually have full control of the server (more common these days even for little apps than when I first wrote this answer), the best ...
Paging UICollectionView by cells, not screen
... Martin KolesMartin Koles
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Get button click inside UITableViewCell
...ce Builder (IB) in step two. Just make sure your buttons tag is set. You really don't want to mix up your action calling. Either do it through IB or do it explicitly in your code.
– Sententia
Apr 29 '14 at 7:12
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UTF-8 byte[] to String
... You can see in here the java.nio.charset.Charset.availableCharsets() map all the charsets not just the charsets in the StandardCharsets. And if you want to use some other charset and still want to prevent the String constructor from throwing UnsupportedEncodingException you may use java.nio.charse...