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MQTT物联网协议完全实践指南 · App Inventor 2 中文网
...态处理
when UrsPahoMqttClient1.ConnectionStateChanged newState
do
if newState = 1 then // 连接成功
set CurrentRetry to 0
set Label_ConnectionStatus.Text to "已连接 - 在线"
set Label_ConnectionStatus.TextColor to Green
call subscribeToAllTopics
...
Given two directory trees, how can I find out which files differ by content?
If I want find the differences between two directory trees, I usually just execute:
10 Answers
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Is there an API to get bank transaction and bank balance? [closed]
...lso Bank of America)
and I want to get my bank transactions and my balance if I can.
Is there an API for that? in PHP or JAVA?
If so, please let me know how to get them.
...
How can I read a large text file line by line using Java?
...null) {
// process the line.
}
}
You can read the data faster if you assume there is no character encoding. e.g. ASCII-7 but it won't make much difference. It is highly likely that what you do with the data will take much longer.
EDIT: A less common pattern to use which avoids the sco...
How do you find the row count for all your tables in Postgres
...looking for a way to find the row count for all my tables in Postgres. I know I can do this one table at a time with:
15 A...
Get the current git hash in a Python script
... This has the drawback that the version printing code will be broken if the code is ever run without the git repo present. For example, in production. :)
– JosefAssad
Feb 20 '13 at 21:18
...
Convert UTC date time to local date time
...d Date.parse, they are equivalent) is strongly discouraged due to browser differences and inconsistencies… (which probably was even more true in 2011)
– Stphane
Feb 16 '18 at 8:08
...
How Pony (ORM) does its tricks?
...mpare(Getattr(Name('c'), 'country'), [('==', Const('USA'))]))])]))
Let's now see how the decompile() function works.
The decompile() function creates a Decompiler object, which implements the Visitor pattern.
The decompiler instance gets bytecode instructions one-by-one.
For each instruction the ...
Find location of a removable SD card
...ny access to them prior to that was through private, unsupported APIs. We now have a quite rich API in the platform that allows applications to make use of SD cards in a supported way, in better ways than they have been able to before: they can make free use of their app-specific storage area witho...
Modify request parameter with servlet filter
...h my values in controller and I have set tha parameter(email and pass) ... now how can i replace the values in my servlet <property name="username" value="somemail@gmail.com" /> //Change email on logging in <property name="password" val...