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MQTT物联网协议完全实践指南 · App Inventor 2 中文网
... CurrentRetry to 0
set Label_ConnectionStatus.Text to "已连接 - 在线"
set Label_ConnectionStatus.TextColor to Green
call subscribeToAllTopics
call startHeartbeat
else if newState = 0 then // 连接断开
set Label_ConnectionStatus.Text to "连接断...
Xcode build failure “Undefined symbols for architecture x86_64”
...
Undefined symbols for architecture x86_64: "_OBJC_CLASS_$_xxx",
referenced from:
objc-class-ref in yyy.o
This generally means, you are calling "xxx" (it may be a framework or class) from the class "yyy". The compiler can not locate the "xxx" so this error occurs.
You n...
Mysql adding user for remote access
...ons on all DB's as such . See below:
my.cnf (my.ini on windows)
#Replace xxx with your IP Address
bind-address = xxx.xxx.xxx.xxx
then
CREATE USER 'myuser'@'localhost' IDENTIFIED BY 'mypass';
CREATE USER 'myuser'@'%' IDENTIFIED BY 'mypass';
Then
GRANT ALL ON *.* TO 'myuser'@'localhost...
Error: Tablespace for table xxx exists. Please DISCARD the tablespace before IMPORT
I am fairly new to MySQL and I am getting a pretty interesting error on which I cannot find any help via google and the stackoverflow search.
...
curl : (1) Protocol https not supported or disabled in libcurl
...ote to the second worked for me, below is the sample curl:
curl -X PUT -u xxx:xxx -T test.txt "https://test.com/test/test.txt"
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windbg 备忘 - 更多技术 - 清泛网 - 专注C/C++及内核技术
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~ (index) r 寄存器，不指定index操作当前线程
注释：$$ xxx; 之间被注释
* xxx;xxx 分号后面被注释
取别名： as v version; v，用户别名
$u0 ~ $u9 固定别名，自动定义别名
al 查看所有别名
...
How to set up Spark on Windows?
...%PATH%
cd /D %SPARK_HOME%
set SPARK_CP=%SPARK_HOME%\conf\;%SPARK_HOME%\lib\xxx.jar;...other jars...
set MAHOUT_CP=%MAHOUT_HOME%\lib\xxx.jar;...other jars...;%MAHOUT_HOME%\xxx.jar;...other jars...;%SPARK_CP%;%MAHOUT_HOME%\lib\spark\xxx.jar;%MAHOUT_HOME%\lib\hadoop\xxx.jar;%MAHOUT_HOME%\src\conf;%JAVA...
How to find all the subclasses of a class given its name?
...lt;class '__main__.Baz'>, <class '__main__.Bing'>]
# using eval('xxx') instead of vars()['xxx']
def func2():
print(all_subclasses(eval('Foo')))
func2() # Works
# -> [<class '__main__.Bar'>, <class '__main__.Baz'>, <class '__main__.Bing'>]
This could be improved...
Check status of one port on remote host [closed]
...mmand line that can check the port status on a remote host. I tried ping xxx.xxx.xxx.xxx:161 but it doesn't recognize the "host". I thought it was a "good" answer until I did the same command against a host I know has that port open. This is for a batch file on Windows that will check the statu...
What is the actual use of Class.forName(“oracle.jdbc.driver.OracleDriver”) while connecting to a dat
....OracleDriver");
conn = DriverManager.getConnection("jdbc:oracle:thin:@XXX.XXX.XXX.XXX:XXXX:dbName", "user", "password");
Statement stmt = conn.createStatement();
out.println("Connection established!");
}
catch (Exception ex)
{
out.println("Exception: " + ex.getMessage() + "");
}
fi...