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Difference between DirectCast() and CType() in VB.NET
.... It will do things you just can't do with a simple (int)-style cast, like convert a string to an integer. It has as much power as calling Convert.To___() in C#, where the ___ is the target type of your cast.
This is desirable because it's very powerful. However, this power comes at the cost of per...
Convert a timedelta to days, hours and minutes
... // 3600, td.seconds // 60 % 60
As for DST, I think the best thing is to convert both datetime objects to seconds. This way the system calculates DST for you.
>>> m13 = datetime(2010, 3, 13, 8, 0, 0) # 2010 March 13 8:00 AM
>>> m14 = datetime(2010, 3, 14, 8, 0, 0) # DST starts...
Spring MVC: How to return image in @ResponseBody?
...ing annotation. Example below works for me out of box. No need of register converter or anything else if you have web mvc enabled (@EnableWebMvc).
@ResponseBody
@RequestMapping(value = "/photo2", method = RequestMethod.GET, produces = MediaType.IMAGE_JPEG_VALUE)
public byte[] testphoto() throws IOE...
Best way to reverse a string
...or (int i = 0; i < length; i++)
{
sb.Append(Convert.ToChar(Convert.ToInt32(Math.Floor(26 * random.NextDouble() + 65))));
}
return sb.ToString();
}
static void Main(string[] args)
{
int[] lengths = new int[] ...
Static/Dynamic vs Strong/Weak
...e run-time effect of simply returning its argument, but at compile time it converts a value of any type to one of any other type. My favorite example is Modula-3, whose designers called their type-casting construct LOOPHOLE.
Having said that, you can't count on any two people using the words "stro...
What is an existential type?
...r bottoms.
Since an existential is a pair, an existential argument can be converted to a universal one via currying.
(∃b. F(b)) -> Int
is the same as:
∀b. (F(b) -> Int)
The former is a rank-2 existential. This leads to the following useful property:
Every existentially quantifie...
Calculate a MD5 hash from a string
...nput);
byte[] hashBytes = md5.ComputeHash(inputBytes);
// Convert the byte array to hexadecimal string
StringBuilder sb = new StringBuilder();
for (int i = 0; i < hashBytes.Length; i++)
{
sb.Append(hashBytes[i].ToString("X2"));
}
...
How to convert a PIL Image into a numpy array?
Alright, I'm toying around with converting a PIL image object back and forth to a numpy array so I can do some faster pixel by pixel transformations than PIL's PixelAccess object would allow. I've figured out how to place the pixel information in a useful 3D numpy array by way of:
...
What is the preferred/idiomatic way to insert into a map?
...l require an additional call to std::pair template constructor in order to convert to value_type (ie : adding const to first_type)
std::pair<int, int> will also require an additional call to the template constructor of std::pair in order to convert the parameter to value_type (ie : adding cons...
Iterate keys in a C++ map
...
EDIT::
In case you want to expose only the keys to outside then you can convert the map to vector or keys and expose.
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