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Why do we use Base64?
...oding and Base64 encoding are interchangeable. They are not. They are used for different purposes.
When you encode text in ASCII, you start with a text string and convert it to a sequence of bytes.
When you encode data in Base64, you start with a sequence of bytes and convert it to a text string. ...
How do sessions work in Express.js with Node.js?
...ramework!) is held on the server, so the cookie is more like a placeholder for the session than a holder of actual session data.
From here, it looks like this session data on the server is by default held in memory, although that could be altered to whatever storage form implements the appropriate A...
Django: Get list of model fields?
...herits from models.Model . I want to get a list of all the fields defined for this model. For example, phone_number = CharField(max_length=20) . Basically, I want to retrieve anything that inherits from the Field class.
...
Conveniently map between enum and int / String
...te, V>();
public ReverseEnumMap(Class<V> valueType) {
for (V v : valueType.getEnumConstants()) {
map.put(v.convert(), v);
}
}
public V get(byte num) {
return map.get(num);
}
}
This solution is nice and doesn't require 'fiddling with ref...
How do you represent a graph in Haskell?
...d B, with A containing B and B containing A, then neither can be created before the other exists. Because Haskell is lazy you can use a trick known as Tying the Knot to get around this, but that makes my brain hurt (because I haven't done much of it yet). I've done more of my substantial programming...
MySQL: Fastest way to count number of rows
...ed when you are selecting rows but still need to know the total row count (for example, for paging).
When you select data rows, just append the SQL_CALC_FOUND_ROWS keyword after SELECT:
SELECT SQL_CALC_FOUND_ROWS [needed fields or *] FROM table LIMIT 20 OFFSET 0;
After you have selected needed ro...
Undo git pull, how to bring repos to old state
...or undo git pull so that my source/repos will come to old state that was before doing git pull ?
I want to do this because it merged some files which I didn't want to do so, but only merge other remaining files. So, I want to get those files back, is that possible?
...
Why is the shovel operator (
...< alters the original string rather than creating a new one. The reason for this is that in ruby a += b is syntactic shorthand for a = a + b (the same goes for the other <op>= operators) which is an assignment. On the other hand << is an alias of concat() which alters the receiver in-...
App Inventor 2 UrsPahoMqttClient 拓展 - 物联网轻量级MQTT协议 · App Inventor 2 中文网
... - 私钥文件密码
可选：打开私钥文件的密码。
ClientPemFormatted - 是否PEM格式
可选：证书和私钥是否是 PEM 格式。
通过密钥库进行身份验证
ClientKeystoreFile - 密钥库文件
可选：密钥库文件的名称。密钥库可以采用 PKCS#12 ...
What's the best way to put a c-struct in an NSArray?
...
NSValue doesn't only support CoreGraphics structures – you can use it for your own too. I would recommend doing so, as the class is probably lighter weight than NSData for simple data structures.
Simply use an expression like the following:
[NSValue valueWithBytes:&p objCType:@encode(Mega...