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MIT官方已升级至2.73版本，中文网待测试并升级相关特性 - App Inventor 2 ...
此版本重点更新 Android Companion 应用及其底层框架。新版本 2.73 现已可从 Google Play 商店和 ai2.appinventor.mit.edu（版本 2.73u）直接下载。
更改：
为 ListView 组件实现“提示”属性，并全面提高其性能。
在 ChatBot 组件中添加下拉...
AppInventor2 离线版：免登录，离线用，一键启动，App开发so easy！ - App ...
...：https://www.fun123.cn/reference/info/desktop.html
什么时候更新电脑版？tina111 发表于 2024-12-27 10:58
什么时候更新电脑版？
这个离线版就是电脑版啊，直接装再电脑上，桌面快捷方式一键启动，就能愉快地编程了，没有多余步骤！...
Need android.permission.BLUETOOTH_SCAN permission for android.content....
...tionSource@1fe6f5d:GattService registerScanner
BluetoothLE 扩展尚未更新以支持 Android 12。作为一种解决方法，您可以将 BluetoothClient 组件添加到您的项目中（这将为项目添加正确的权限），然后使用屏幕的 AskForPermission 块请求 BLUETOOTH_SCAN ...
Regular expression that matches valid IPv6 addresses
I'm having trouble writing a regular expression that matches valid IPv6 addresses, including those in their compressed form (with :: or leading zeros omitted from each byte pair).
...
How to sleep for five seconds in a batch file/cmd [duplicate]
Windows's Snipping tool can capture the screen, but sometimes I want to capture the screen after five seconds, such as taking an image being displayed by the webcam. (Run the script and smile at the camera, for example.)
...
Setting up FTP on Amazon Cloud Server [closed]
...at you already have an EC2 instance created and have associated an Elastic IP Address to it.
Step #1: Install vsftpd
SSH to your EC2 server. Type:
> sudo yum install vsftpd
This should install vsftpd.
Step #2: Open up the FTP ports on your EC2 instance
Next, you'll need to open up the F...
What is a non-capturing group in regular expressions?
...1).
Let's try some substitutions now. Consider the following text:
Lorem ipsum dolor sit amet consectetuer feugiat fames malesuada pretium egestas.
Now, let's use this dumb regex over it:
\b(\S)(\S)(\S)(\S*)\b
This regex matches words with at least 3 characters, and uses groups to separate th...
How to test which port MySQL is running on and whether it can be connected to?
... I thought to be externally visible, it had to be the machine's own IP address and that 0.0.0.0 means the service is not available from anywhere. Do I have that wrong? I have a box running MySQL, the firewall has 3306 open from any IP address but MySQL is refusing the connection, I thought b...
Mysql adding user for remote access
...o connect remotely you have to have MySQL bind port 3306 to your machine's IP address in my.cnf. Then you have to have created the user in both localhost and '%' wildcard and grant permissions on all DB's as such . See below:
my.cnf (my.ini on windows)
#Replace xxx with your IP Address
bind-addre...
com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure
...achable at all. This can have one or more of the following causes:
IP address or hostname in JDBC URL is wrong.
Hostname in JDBC URL is not recognized by local DNS server.
Port number is missing or wrong in JDBC URL.
DB server is down.
DB server doesn't accept TCP/IP connections.
D...