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App Inventor 2 BLE扩展源码分析 - WriteBytes vs WriteStrings 23字节硬编...
...键文件：
- BluetoothLE.java（2975行）-- 公开API层
- BluetoothLEint.java（3165行）-- 内部实现层
二、核心发现：23字节硬编码限制
2.1 WriteStrings 的写入路径
位于 BLEWriteOperation.write() 方法第678-690行：
if (mClass == String.class) {
&...
How do I copy the contents of one stream to another?
...nput.CopyTo(output);
For .NET 3.5 and before
There isn't anything baked into the framework to assist with this; you have to copy the content manually, like so:
public static void CopyStream(Stream input, Stream output)
{
byte[] buffer = new byte[32768];
int read;
while ((read = input...
How to sort by two fields in Java?
I have array of objects person (int age; String name;) .
16 Answers
16
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Difference between String#equals and String#contentEquals methods
... to clarify, the == operator in Java is for checking whether two objects point to the same location in memory, or whether two primitive types (byte, short, int, long, float, double, char, boolean) are equal.
– La-comadreja
Dec 28 '13 at 13:47
...
HTTP POST using JSON in Java
...
You can make use of Gson library to convert your java classes to JSON objects.
Create a pojo class for variables you want to send
as per above Example
{"name":"myname","age":"20"}
becomes
class pojo1
{
String name;
String age;
//generate setter a...
Java SimpleDateFormat(“yyyy-MM-dd'T'HH:mm:ss'Z'”) gives timezone as IST
...Sep 29 18:46:19 CST 2013
From Java Date Object to ISO 8601 String
And to convert Dateobject to ISO 8601 Standard (yyyy-MM-dd'T'HH:mm:ss'Z') use following code
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss'Z'", Locale.US);
sdf.setTimeZone(TimeZone.getTimeZone("GMT")); ...
What's the best way to trim std::string?
...(), std::find_if(s.begin(), s.end(),
std::not1(std::ptr_fun<int, int>(std::isspace))));
return s;
}
// trim from end
static inline std::string &rtrim(std::string &s) {
s.erase(std::find_if(s.rbegin(), s.rend(),
std::not1(std::ptr_fun<int, int>(std...
How to launch Safari and open URL from iOS app
...omputed properties I'm guessing). Additionally URL is no longer implicitly convertible to NSURL, must be explicitly converted with as!
UIApplication.sharedApplication.openURL(NSURL(string:"http://www.reddit.com/") as! URL)
New Swift Syntax as of iOS 10.0
The openURL method has been deprecated an...
Capture screenshot of active window?
...
On HD resolution with zoomed Windows Interface elements, this class doesn't capture the whole screen.
– Yeronimo
May 7 '18 at 21:26
...
Use ffmpeg to add text subtitles [closed]
...peg install has the library in the configuration --enable-libass).
First convert the subtitles to .ass format:
ffmpeg -i subtitles.srt subtitles.ass
Then add them using a video filter:
ffmpeg -i mymovie.mp4 -vf ass=subtitles.ass mysubtitledmovie.mp4
...