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BLE UUID是对的但连接闪退：java.lang.IllegalArgumentException: UUID str...
...attAttributes.java:33)
... 10 more
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经过调查，问题出在如下报错中的“uuid string too large”上，java内置的UUID中的函数。
通过调查发现是由于ble拓展编译平台（java8），和目前appinventor with sdk34 平台（java11） 对这个函数...
Service and Characteristic are not published by the connected device -...
Service and Characteristic are not published by the connected device，报错如下：
问题原因：硬件/蓝牙芯片问题导致的，比如A硬件测试好的，换了B硬件没有修改uuid，就出现这个报错。
由于B硬件没有发布这些特征，就会报这个错误。
Appinventor 音效调用播放后没有声音？ - App应用开发 - 清泛IT社区，为创新赋能！
...发现调用播放后，又调用了停止方法，导致的声音不播放问题，去掉即可。
当然如果因为音频文件损坏等原因，也可能无法正常播放，这时可以先去资源区，点击隐私文件，菜单中选择预览，可以预览播放，事先检查好确保...
Grabbing the href attribute of an A element
...t;getElementsByTagName('a') as $node) {
echo $dom->saveHtml($node), PHP_EOL;
}
The above would find and output the "outerHTML" of all A elements in the $html string.
To get all the text values of the node, you do
echo $node->nodeValue;
To check if the href attribute exists you can ...
How do I remove  from the beginning of a file?
...S file that looks fine when I open it using gedit , but when it's read by PHP (to merge all the CSS files into one), this CSS has the following characters prepended to it: 
...
Memcache Vs. Memcached [duplicate]
Someone can explain me the difference between Memcache and Memcached in PHP environment?
What are the advantages of one over the other?
Can you also suggest the criteria used to choose between one or the other?
...
Configure WAMP server to send email
Is there a way that I can configure the WAMP server for PHP to enable the mail() function?
7 Answers
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How do I add 24 hours to a unix timestamp in php?
...add 24 hours to the timestamp for right now then simply you can do:
<?php echo strtotime('+1 day'); ?>
Above code will add 1 day or 24 hours to your current timestamp.
in place of +1 day you can take whatever you want, As php manual says strtotime can Parse about any English textual datet...
Mixing a PHP variable with a string literal
...ake a look to the Variable parsing - Complex (curly) syntax section of the PHP manual.
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Submitting a multidimensional array via POST with php
I have a php form that has a known number of columns (ex. top diameter, bottom diameter, fabric, colour, quantity), but has an unknown number of rows, as users can add rows as they need.
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