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BLE（二）信道&数据包&协议栈格式 - 创客硬件开发 - 清泛IT社区，...
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Service和Characteristic则是比较重要的，Service可以理解为PHP中的“类”、功能对象的集合。Characteristic可以理解为PHP的“函数”，是GATT中具体的功能对象，每个Service都可以包含一个或多个Characteristic（特征）。Characteristic是GATT pr...
Why are dashes preferred for CSS selectors / HTML attributes?
...e-clicking on a hyphenated word will only select part of it, not the whole token: this seems to be OS-wide.
– Andrew Vit
Sep 26 '11 at 21:32
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How to convert a string into double and vice versa?
...separators, also.
NSNumberFormatter * myNumFormatter = [[NSNumberFormatter alloc] init];
[myNumFormatter setLocale:[NSLocale currentLocale]]; // happen by default?
[myNumFormatter setFormatterBehavior:NSNumberFormatterBehavior10_4];
// next line is very important!
[myNumFormatter setNumberStyle...
Difference between fprintf, printf and sprintf?
...dout)
fprintf goes to a file handle (FILE*)
sprintf goes to a buffer you allocated. (char*)
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Why does std::getline() skip input after a formatted extraction?
...lt that is the newline. If those X number of strings are just single words/tokens then this job can be easily accomplished with >>. Otherwise you would input the first number into an integer with >>, call cin.ignore() on the next line, and then run a loop where you use getline().
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When should I use nil and NULL in Objective-C?
...e object. Let's have an example:
NSMutableArray *check = [[NSMutableArray alloc] init];
[check addObject:[NSNull null]];
[check addObject:nil];
On the second line, we will not get any error, because it is perfectly fair to insert a NSNull object into a collection type object. On the third line, w...
Maximum size of an Array in Javascript
...a big deal
x=3e7 takes 1300ms, which is pretty bad
x=4e7 takes 11000ms and allocates an extra 2.5GB of memory
So around 30 million elements is a hard upper limit, because the javascript VM falls off a cliff at 40 million elements and will probably crash the process.
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How do I quickly rename a MySQL database (change schema name)?
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I think the solution is simpler and was suggested by some developers. phpMyAdmin has an operation for this.
From phpMyAdmin, select the database you want to select. In the tabs there's one called Operations, go to the rename section. That's all.
It does, as many suggested, create a new databa...
Generate a random alphanumeric string in Cocoa
... genRandStringLength should just return randomString. There's no reason to alloc and init (and not autorelease!) a whole new string.
– kevingessner
Apr 14 '10 at 0:49
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Difference between the Apache HTTP Server and Apache Tomcat? [closed]
...r. A servlet, at the end, is a Java class. JSP files (which are similar to PHP, and older ASP files) are generated into Java code (HttpServlet), which is then compiled to .class files by the server and executed by the Java virtual machine.
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