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App Inventor 2 拓展参考文档 · App Inventor 2 中文网
...程 IoT专题 AI2拓展 ChatGPT接入 Aia Store 开通VIP 搜索 App Inventor 2 拓展参考文档
中文网拓展
第...
ImageConvertor 扩展：免费图像转换器，支持JPG/PNG/WEBP格式转换和图像处...
...onverted.png"
调用 ImageConvertor1.Convert 输入路径 输出路径
显示通知 "转换完成！"
图像旋转
当 旋转按钮.被点击
设置 原图路径 = 文件选择器.路径
设置 旋转后路径 = "/sdcard/rotated_image.jpg"
调用 ImageConvertor1.R...
How do you sign a Certificate Signing Request with your Certification Authority?
...cConstraints = CA:FALSE
keyUsage = digitalSignature, keyEncipherment
subjectAltName = @alternate_names
nsComment = "OpenSSL Generated Certificate"
####################################################################
[ alternate_names ]
DNS.1 = example.com
DNS.2 =...
How to validate an email address using a regular expression?
... that validates MOST email addresses correctly, assuming they don't use an IP address as the server part.
75 Answers
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Java current machine name and logged in user?
...he Java API says that getHostName() will return
the host name for this IP address, or if the operation is not allowed by the security check, the textual representation of the IP address.
share
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Is there a way to make npm install (the command) to work behind proxy?
...y http://username:password@cacheaddress.com.br:80 install packagename
Skip the username:password part if proxy doesn't require you to authenticate
EDIT: A friend of mine just pointed out that you may get NPM to work behind a proxy by setting BOTH HTTP_PROXY and HTTPS_PROXY environment variables,...
How to use cURL to get jSON data and decode the data?
...
You can Use this for Curl:
function fakeip()
{
return long2ip( mt_rand(0, 65537) * mt_rand(0, 65535) );
}
function getdata($url,$args=false)
{
global $session;
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL,$url);
curl_setopt($ch...
TCP 的那些事儿（下） - 更多技术 - 清泛网 - 专注C/C++及内核技术
...能动态地设置。 为了动态地设置，TCP引入了RTT——Round Trip Time，也就是一个数据包从发出去到回来的时间。这样发送端就大约知道需要多少的时间，从而可以方便地设置Timeout——RTO（Retransmission TimeOut），以让我们的重传机制更...
Test if remote TCP port is open from a shell script
...ing if a given TCP port is open on a remote server, from inside a Shell script.
16 Answers
...
ConnectionTimeout versus SocketTimeout
... answer. This means that the server has been shut down, you used the wrong IP/DNS name, wrong port or the network connection to the server is down.
A socket timeout is dedicated to monitor the continuous incoming data flow. If the data flow is interrupted for the specified timeout the connection is...