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How do you convert a byte array to a hexadecimal string, and vice versa?
...x.Length;
byte[] bytes = new byte[NumberChars / 2];
for (int i = 0; i < NumberChars; i += 2)
bytes[i / 2] = Convert.ToByte(hex.Substring(i, 2), 16);
return bytes;
}
Using Substring is the best option in combination with Convert.ToByte. See this answer for more information. If you ne...
Why is there no Tree class in .NET?
...
You could define your own:
public class MyTree<K, V> : Dictionary<K, MyTree<K, V>>
{
public V Value { get; set; }
}
Or unkeyed:
public class MyTree<V> : HashSet<MyTree<V>>
{
public V Value { get; set; }
}
...
C# Sanitize File Name
... into account Spud's comment on reserved words, I made this version:
/// <summary>
/// Strip illegal chars and reserved words from a candidate filename (should not include the directory path)
/// </summary>
/// <remarks>
/// http://stackoverflow.com/questions/309485/c-sharp-saniti...
Jackson databind enum case insensitive
... public static void main(String[] args) throws IOException {
List<DataType> types = Arrays.asList(JSON, HTML);
ObjectMapper mapper = new ObjectMapper();
SimpleModule module = new SimpleModule();
module.setDeserializerModifier(new BeanDeserializerModifier() {
...
Rails: Open link in new tab (with 'link_to')
... whereas you put it in image_tag parameters. Modify your code like this:
<%= link_to image_tag("facebook.png", class: :facebook_icon, alt: "Facebook"), "http://www.facebook.com/mypage", target: :_blank %>
Or with a block:
<%= link_to "http://www.facebook.com/mypage", target: :_blank do ...
What is the fastest/most efficient way to find the highest set bit (msb) in an integer in C?
...
GCC has:
-- Built-in Function: int __builtin_clz (unsigned int x)
Returns the number of leading 0-bits in X, starting at the most
significant bit position. If X is 0, the result is undefined.
-- Built-in Function: int __builtin...
Sort a text file by line length including spaces
...r the input lines. Here is a one liner:
perl -e 'print sort { length($a) <=> length($b) } <>'
You can put this in your pipeline wherever you need it, either receiving STDIN (from cat or a shell redirect) or just give the filename to perl as another argument and let it open the file.
...
HashMap to return default value for non-found keys?
Is it possible to have a HashMap return a default value for all keys that are not found in the set?
14 Answers
...
Why use non-member begin and end functions in C++11?
...ming because they can be added afterwards, on a data-structure you cannot alter.
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MySQL select where column is not empty
...phone, phone2
from jewishyellow.users
where phone like '813%' and phone2<>''
Note that NULL value is interpreted as false.
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