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文件管理模块 - App Inventor 2 中文网 - 清泛IT社区，为创新赋能！
appinventor2中数据存储的文件管理器模块，手机找不到根目录怎么办请提供详细的报错等截图！引用: App Inventor 2 发表于 2025-05-22 10:03
请提供详细的报错等截图！
这个不是报错类的问题，是手机文件管理器没办法显示app的...
WavSoundRecorder 录音拓展，生成 .wav 格式音频文件，可用于百度云语音识...
...馈：百度云语音识别时，需要传入 .wav 或 .m4a 格式的音频文件，但是原生的 （多媒体下的）“录音机” 组件生成的是 .3gp 格式的音频文件，不能识别，有没有 .wav 格式的录音拓展？
有，验证下来生成的 .wav 格式音频可以识...
How can I start PostgreSQL server on Mac OS X?
...e, so for those who are looking for it:
initdb /usr/local/var/postgres -E utf8
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What's the correct way to convert bytes to a hex string in Python 3?
...
>>> import binascii
>>> binascii.hexlify('foo'.encode('utf8'))
b'666f6f'
>>> binascii.unhexlify(_).decode('utf8')
'foo'
See this answer:
Python 3.1.1 string to hex
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What does character set and collation mean exactly?
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I suggest to use utf8mb4_unicode_ci, which is based on the Unicode standard for sorting and comparison, which sorts accurately in a very wide range of languages.
shar...
How to reverse a string in Go?
... of the input in bytes. It does not correspond to its length. - Not all utf8's runes are of the same size. It can be either 1, 2, 4, or 8. - You should use unicode/ut8 package's method RuneCountInString to get the length of the rune.
– Anvesh Checka
May 2...
记一次MongoDB性能问题 - 大数据 & AI - 清泛网 - 专注C/C++及内核技术
...mongoimport工具可供使用，不过它只接受json、csv等格式的源文件，不适合我的需求，所以我没用，而是用PHP写了一个脚本，平稳运行了一段时间后，我发现数据导入的速度下降了，同时PHP抛出异常：
cursor timed out (timeout: 30000, time l...
Log all queries in mysql
... `thread_id` bigint(21) unsigned NOT NULL
) ENGINE=CSV DEFAULT CHARSET=utf8 COMMENT='Slow log'
CREATE TABLE `general_log` (
`event_time` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP
ON UPDATE CURRENT_TIMESTAMP,
`user_host` mediumtext NOT NULL,
`thread_id` b...
How to stop app that node.js express 'npm start'
...ndefined') {
fs.writeFileSync('.server.pid', child.pid, {
encoding: 'utf8'
})
}
build/stop-server.js
import fs from 'fs'
import kill from 'tree-kill'
const serverPid = fs.readFileSync('.server.pid', {
encoding: 'utf8'
})
fs.unlinkSync('.server.pid')
kill(serverPid)
package.json
"sc...
How to create CSV Excel file C#? [closed]
... public byte[] ExportToBytes()
{
return Encoding.UTF8.GetBytes(Export());
}
//get the csv value for field.
private string MakeValueCsvFriendly(object value)
{
if (value == null) return "";
if (value is Nullable &&...