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App Inventor 2 拓展参考文档 · App Inventor 2 中文网
...的复制粘贴功能
【Socket】 ClientSocketAI2Ext 拓展加强版：TCP/IP传输协议
【FTP】 FTP 客户端拓展：FTP协议连接、上传、下载、创建、修改目录等
【短信平台接入】 AliSms 拓展：阿里云短信平台接入，短信验证码
【设备信息】 Ph...
How to kill a process on a port on ubuntu
...? If Linux specific then, even this command works os.system("fuser -k 8080/tcp");
– Ridhuvarshan
Jul 25 '18 at 12:04
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How do C++ class members get initialized if I don't do it explicitly?
Suppose I have a class with private memebers ptr , name , pname , rname , crname and age . What happens if I don't initialize them myself? Here is an example:
...
How do function pointers in C work?
...ter to a function which receives 2 ints and returns an int:
int (*functionPtr)(int,int);
Now we can safely point to our function:
functionPtr = &addInt;
Now that we have a pointer to the function, let's use it:
int sum = (*functionPtr)(2, 3); // sum == 5
Passing the pointer to another f...
What does “connection reset by peer” mean?
What is the meaning of the "connection reset by peer" error on a TCP connection? Is it a fatal error or just a notification or related to the network failure?
...
How to use C++ in Go
...
Seems that currently SWIG is best solution for this:
http://www.swig.org/Doc2.0/Go.html
It supports inheritance and even allows to subclass C++ class with Go struct so when overridden methods are called in C++ code, Go code is fired.
Section about C++ in Go FAQ is updated and...
In what situations would AJAX long/short polling be preferred over HTML5 WebSockets?
...d, due to timeouts or data eof. On server side it is still treated like an HTTP request, same as AJAX, except the answer on request will happen now or some time in the future, defined by the application logic.
support chart (full) | wikipedia
WebSockets - client ↔ server. Create a TCP connection ...
std::string formatting like sprintf
...std::string& format, Args ... args )
{
size_t size = snprintf( nullptr, 0, format.c_str(), args ... ) + 1; // Extra space for '\0'
if( size <= 0 ){ throw std::runtime_error( "Error during formatting." ); }
std::unique_ptr<char[]> buf( new char[ size ] );
snprintf( buf.g...
Do you (really) write exception safe code? [closed]
...escribed in an article his experience about making the STL exception safe:
http://www.boost.org/community/exception_safety.html
Look at the 7th point (Automated testing for exception-safety), where he relies on automated unit testing to make sure every case is tested. I guess this part is an excelle...
How do ports work with IPv6?
...e as today. However, be sure you include [] around your IP.
For example : http://[1fff:0:a88:85a3::ac1f]:8001/index.html
Wikipedia has a pretty good article about IPv6: http://en.wikipedia.org/wiki/IPv6#Addressing
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