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MQTT报文多个数据的提取 - App Inventor 2 拓展 - 清泛IT社区，为创新赋能！
想做个订阅MQTT，采集的APP，怎么才能正确的连接mqtt服务器并订阅主题，把对应的数据按顺序提取到标签1，标签2，标签3……我把画面和mqtt订阅的数据发上来，求解救！！
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"RTValue": [
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Is there a CSS parent selector?
...laration of a Selector Subject with no child selector (#a! alone throws an error, #a! p works), and so the others will not works either because of Uncaught TypeError: Cannot call method 'split' of undefined: see jsfiddle.net/HerrSerker/VkVPs
– yunzen
Apr 16 '13...
What does it mean if a Python object is “subscriptable” or not?
...he object is not subscriptable, wrap it in a try block with an except TypeError.
– Mark Reed
Apr 2 at 14:28
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How to get the error message from the error code returned by GetLastError()?
After a Windows API call, how can I get the last error message in a textual form?
11 Answers
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How to force Selenium WebDriver to click on element which is not currently visible?
...ny times I've had two elements at play and one is hidden and gives me this error.
– Chris
Jun 11 '19 at 15:53
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Function to clear the console in R and RStudio
I am wondering if there is a function to clear the console in R and, in particular, RStudio I am looking for a function that I can type into the console, and not a keyboard shortcut.
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SVN change username
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I get an error "svn: E155024: Invalid source URL prefix: 'protocol://currentUser@server/path' (does not overlap target's URL 'protocol://newUser@server/path')" [with my real URLs, of course]
– James Roth
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How to avoid installing “Unlimited Strength” JCE policy files when deploying an application?
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I get this error after running this: java.security.InvalidKeyException: Wrong algorithm: AES or Rijndael required
– Andrew
Aug 24 '16 at 18:58
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clang error: unknown argument: '-mno-fused-madd' (python package installation failure)
I get the following error when attempting to install psycopg2 via pip on Mavericks 10.9:
14 Answers
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psql: FATAL: role “postgres” does not exist
...s using homebrew, see the comment from @user3402754 below.
Note that the error message does NOT talk about a missing database, it talks about a missing role. Later in the login process it might also stumble over the missing database.
But the first step is to check the missing role: What is the ou...