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乐高机器人®组件 · App Inventor 2 中文网
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Comparing HTTP and FTP for transferring files
...aster. FTP requires a control channel and state be maintained besides the TCP state but HTTP does not. There are 6 packet transfers before data starts transferring in FTP but only 4 in HTTP.
I think a properly tuned TCP layer would have more effect on speed than the difference between application...
Rails server says port already used, how to kill that process?
...ype this in your terminal to find out the PID of the process:
$ lsof -wni tcp:3000
Then, use the number in the PID column to kill the process:
$ kill -9 PID
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stop all instances of node.js server
...NING" | find "8080"
The fifth column of the output is the process ID:
TCP 0.0.0.0:8080 0.0.0.0:0 LISTENING 14828
TCP [::]:8080 [::]:0 LISTENING 14828
You could then kill the process with taskkill /pid 14828. If the proces...
node and Error: EMFILE, too many open files
.../OFF NODE NAME
...
nodejs 12211 root 1012u IPv4 151317015 0t0 TCP 10.101.42.209:40371->54.236.3.170:80 (ESTABLISHED)
nodejs 12211 root 1013u IPv4 151279902 0t0 TCP 10.101.42.209:43656->54.236.3.172:80 (ESTABLISHED)
nodejs 12211 root 1014u IPv4 151317016 0t...
What can be the reasons of connection refused errors?
...
If you try to open a TCP connection to another host and see the error "Connection refused," it means that
You sent a TCP SYN packet to the other host.
Then you received a TCP RST packet in reply.
RST is a bit on the TCP packet which indicate...
How to close TCP and UDP ports via windows command line
Does somebody knows how to close a TCP or UDP socket for a single connection via windows command line?
17 Answers
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Checking network connection
...p (0.0048s latency).
Not shown: 999 filtered ports
PORT STATE SERVICE
53/tcp open domain
Nmap done: 1 IP address (1 host up) scanned in 23.81 seconds
As we can see, 53/tcp is open and non-filtered. If you are a non-root user, remember to use sudo or the -Pn argument for Nmap to send crafted pro...
由“Pure Virtual Function Called” 考虑到的 - C/C++ - 清泛网 - 专注C/C++及内核技术
...修改对象的虚函数表指针值 一般情况下（特指基类不使用novtable属性），debug编译出 1. 派生类对象析构时，基类析构函数执行的前期会修改对象的虚函数表指针值
一般情况下（特指基类不使用novtable属性），debug编译出...
ifstream 线程安全读文件 - C/C++ - 清泛网 - 专注C/C++及内核技术
...istream& safeGetline(std::istream& is, std::string& t){ t clear(); 使用std::streambuf 函数 safeGetline：
std::istream& safeGetline(std::istream& is, std::string& t)
{
t.clear();
//这比使用std::istream逐个读取它们要快。
//以这种方式使用streambuf...