QT error expected: ‘before’ qmessagelogger ‘?
Metaphysical problems:
on November 4, 2021, compilation repeatedly reported errors. Expected ‘:’ before ‘qmessagelogger’:
Unable to find the reason, and then waited for a while, this error suddenly appeared:
Add a semicolon “:” and compile it. It’s very interesting…
Brew install golangci lint reports an error
Installation command:
brew install golangci-lint
report errors:
Error: No such file or directory @ rb_sysopen - /Users/...-go-1.16.6.big_sur.bottle.tar.gz
reason:
Go version problem
go 1.16.5 is already installed but outdated
Solution:
install go first and then golangci lint
brew install go
brew install golangci-lint
Use the command easy_ Install install pip
Use the command sudo easy_Install PIP installing PIP failed. The information of executing the command is as follows:
➜ ~ sudo easy_install pip
Password:
Searching for pip
Reading https://pypi.org/simple/pip/
Downloading https://files.pythonhosted.org/packages/da/f6/c83229dcc3635cdeb51874184241a9508ada15d8baa337a41093fab58011/pip-21.3.1.tar.gz#sha256=fd11ba3d0fdb4c07fbc5ecbba0b1b719809420f25038f8ee3cd913d3faa3033a
Best match: pip 21.3.1
Processing pip-21.3.1.tar.gz
Writing /tmp/easy_install-8XXfb1/pip-21.3.1/setup.cfg
Running pip-21.3.1/setup.py -q bdist_egg --dist-dir /tmp/easy_install-8XXfb1/pip-21.3.1/egg-dist-tmp-5cqtMF
Traceback (most recent call last):
# ...
File "/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python/setuptools/sandbox.py", line 44, in _execfile
code = compile(script, filename, 'exec')
File "/tmp/easy_install-8XXfb1/pip-21.3.1/setup.py", line 7
def read(rel_path: str) -> str:
^
SyntaxError: invalid syntax
Solution
Download the script file get-pip.py:
curl 'https://bootstrap.pypa.io/get-pip.py' > get-pip.py
Then execute the script file get-pip.py with the command python3:
sudo python3 get-pip.py
This completes the installation.
The process information of executing the command is as follows:
➜ ~ curl 'https://bootstrap.pypa.io/get-pip.py' > get-pip.py
% Total % Received % Xferd Average Speed Time Time Time Current
Dload Upload Total Spent Left Speed
100 2108k 100 2108k 0 0 2571k 0 --:--:-- --:--:-- --:--:-- 2568k
➜ ~ sudo python3 get-pip.py
Password:
WARNING: The directory '/Users/liaowenxiong/Library/Caches/pip' or its parent directory is not owned or is not writable by the current user. The cache has been disabled. Check the permissions and owner of that directory. If executing pip with sudo, you should use sudo's -H flag.
DEPRECATION: Configuring installation scheme with distutils config files is deprecated and will no longer work in the near future. If you are using a Homebrew or Linuxbrew Python, please see discussion at https://github.com/Homebrew/homebrew-core/issues/76621
Collecting pip
Downloading pip-21.3.1-py3-none-any.whl (1.7 MB)
|████████████████████████████████| 1.7 MB 1.0 MB/s
Installing collected packages: pip
Attempting uninstall: pip
Found existing installation: pip 21.2.4
Uninstalling pip-21.2.4:
Successfully uninstalled pip-21.2.4
DEPRECATION: Configuring installation scheme with distutils config files is deprecated and will no longer work in the near future. If you are using a Homebrew or Linuxbrew Python, please see discussion at https://github.com/Homebrew/homebrew-core/issues/76621
Successfully installed pip-21.3.1
WARNING: Running pip as the 'root' user can result in broken permissions and conflicting behaviour with the system package manager. It is recommended to use a virtual environment instead: https://pip.pypa.io/warnings/venv
➜ ~ pip --version
pip 21.3.1 from /usr/local/lib/python3.9/site-packages/pip (python 3.9)
A simpler command to execute is as follows:
curl https://bootstrap.pypa.io/get-pip.py | python3
Uninstall pip
sudo pip uninstall pip
1. Troubleshooting ideas
[root@DBMysql ~]#masterha_check_repl --conf=/etc/masterha/app1.cnf
There are two main reasons for the following error reports:
① MySQL is installed with the source code, resulting in the inconsistency between the MySQL directory and the MHA default directory. The solution is to use ln – s as the relevant soft connection. Note: my MySQL database is installed by MySQL user and MHA is installed by root user. If I install it under the same user, I wonder whether such problems can be avoided
② The user permissions corresponding to the candidate_master are insufficient.
2. error 1
[root@data01 ~]# masterha_check_repl--conf=/etc/masterha/app1.cnf
Tue Apr 7 22:31:06 2015 - [warning] Global configuration file/etc/masterha_default.cnf not found. Skipping.
Tue Apr 7 22:31:07 2015 - [info] Reading application default configuration from/etc/masterha/app1.cnf..
Tue Apr 7 22:31:07 2015 - [info] Reading server configuration from/etc/masterha/app1.cnf..
Tue Apr 7 22:31:07 2015 - [info] MHA::MasterMonitor version 0.56.
Tue Apr 7 22:31:07 2015 - [error][/usr/local/share/perl5/MHA/Server.pm,ln303] Getting relay log directory orcurrent relay logfile from replication table failed on192.168.52.130(192.168.52.130:3306)!
Tue Apr 7 22:31:07 2015 - [error][/usr/local/share/perl5/MHA/MasterMonitor.pm,ln424] Error happened on checking configurations. at /usr/local/share/perl5/MHA/ServerManager.pmline 315
Tue Apr 7 22:31:07 2015 - [error][/usr/local/share/perl5/MHA/MasterMonitor.pm,ln523] Error happened on monitoring servers.
Tue Apr 7 22:31:07 2015 - [info] Got exit code 1 (Not master dead).
MySQL Replication Health is NOT OK!
Solution:
On 192.168.52.130, vim /etc/my.cnf and add
relay-log=/home/data/mysql/binlog/mysql-relay-bin
Then restart mysql, and then go to reset the slave connection.
STOP SLAVE;
RESET SLAVE;
CHANGE MASTER TOMASTER_HOST='192.168.52.129',MASTER_USER='repl',MASTER_PASSWORD='repl_1234',MASTER_LOG_FILE='mysql-bin.000178',MASTER_LOG_POS=459;
START SLAVE;
2. error 2
[root@data01 perl]# masterha_check_repl--conf=/etc/masterha/app1.cnf
Thu Apr 9 00:54:32 2015 - [warning] Global configuration file/etc/masterha_default.cnf not found. Skipping.
Thu Apr 9 00:54:32 2015 - [info] Reading application default configuration from/etc/masterha/app1.cnf..
Thu Apr 9 00:54:32 2015 - [info] Reading server configuration from/etc/masterha/app1.cnf..
Thu Apr 9 00:54:32 2015 - [info] MHA::MasterMonitor version 0.56.
Thu Apr 9 00:54:32 2015 - [error][/usr/local/share/perl5/MHA/Server.pm,ln306] Getting relay log directory orcurrent relay logfile from replication table failed on 192.168.52.130(192.168.52.130:3306)!
Thu Apr 9 00:54:32 2015 - [error][/usr/local/share/perl5/MHA/MasterMonitor.pm,ln424] Error happened on checking configurations. at/usr/local/share/perl5/MHA/ServerManager.pm line 315
Thu Apr 9 00:54:32 2015 - [error][/usr/local/share/perl5/MHA/MasterMonitor.pm,ln523] Error happened on monitoring servers.
Thu Apr 9 00:54:32 2015 - [info] Got exit code 1 (Not master dead).
MySQL Replication Health is NOT OK!
Solution:
/etc/masterha/app1.cnf file inside the parameter configuration, user and repl_user are mysql account, need to create a good, here is only created repl_user but not create a good user account: user=manager
user=manager
password=manager_1234
repl_user=repl
repl_password=repl_1234
On the mysql node, create the "manager manager" account that allows manager access to the database, mainly for SHOW SLAVESTATUS,RESET SLAVE; so you need to execute the following command.
GRANT SUPER,RELOAD,REPLICATIONCLIENT,SELECT ON *.* TO manager@'192.168.52.%' IDENTIFIED BY 'manager_1234';
3. error 3
[root@oraclem1 ~]# masterha_check_repl--conf=/etc/masterha/app1.cnf
Thu Apr 9 23:09:05 2015 - [warning] Global configuration file/etc/masterha_default.cnf not found. Skipping.
Thu Apr 9 23:09:05 2015 - [info] Reading application default configuration from/etc/masterha/app1.cnf..
Thu Apr 9 23:09:05 2015 - [info] Reading server configuration from/etc/masterha/app1.cnf..
Thu Apr 9 23:09:05 2015 - [info] MHA::MasterMonitor version 0.56.
Thu Apr 9 23:09:05 2015 - [error][/usr/local/share/perl5/MHA/ServerManager.pm,ln781] Multi-master configuration is detected, but two or more masters areeither writable (read-only is not set) or dead! Check configurations fordetails. Master configurations are as below:
Master 192.168.52.130(192.168.52.130:3306),replicating from 192.168.52.129(192.168.52.129:3306)
Master 192.168.52.129(192.168.52.129:3306),replicating from 192.168.52.130(192.168.52.130:3306)
Thu Apr 9 23:09:05 2015 - [error][/usr/local/share/perl5/MHA/MasterMonitor.pm,ln424] Error happened on checking configurations. at/usr/local/share/perl5/MHA/MasterMonitor.pm line 326
Thu Apr 9 23:09:05 2015 - [error][/usr/local/share/perl5/MHA/MasterMonitor.pm,ln523] Error happened on monitoring servers.
Thu Apr 9 23:09:05 2015 - [info] Got exit code 1 (Not master dead).
MySQL Replication Health is NOT OK!
Solution:
mysql> set global read_only=1;
Query OK, 0 rows affected (0.00 sec)
4. error 4
Thu Apr 9 23:54:32 2015 - [info] Checking SSH publickey authentication andchecking recovery script configurations on all alive slave servers..
Thu Apr 9 23:54:32 2015 - [info] Executing command : apply_diff_relay_logs --command=test--slave_user='manager' --slave_host=192.168.52.130 --slave_ip=192.168.52.130--slave_port=3306 --workdir=/var/tmp --target_version=5.6.12-log--manager_version=0.56 --relay_dir=/home/data/mysql/data--current_relay_log=mysqld-relay-bin.000011 --slave_pass=xxx
Thu Apr 9 23:54:32 2015 - [info] Connecting to [email protected](192.168.52.130:22)..
Can't exec "mysqlbinlog": No suchfile or directory at /usr/local/share/perl5/MHA/BinlogManager.pm line 106.
mysqlbinlog version command failed with rc1:0, please verify PATH, LD_LIBRARY_PATH, and client options
at/usr/local/bin/apply_diff_relay_logs line 493
Thu Apr 9 23:54:32 2015 - [error][/usr/local/share/perl5/MHA/MasterMonitor.pm,ln205] Slaves settings check failed!
Thu Apr 9 23:54:32 2015 - [error][/usr/local/share/perl5/MHA/MasterMonitor.pm,ln413] Slave configuration failed.
Thu Apr 9 23:54:32 2015 - [error][/usr/local/share/perl5/MHA/MasterMonitor.pm,ln424] Error happened on checking configurations. at /usr/local/bin/masterha_check_repl line 48
Thu Apr 9 23:54:32 2015 - [error][/usr/local/share/perl5/MHA/MasterMonitor.pm,ln523] Error happened on monitoring servers.
Thu Apr 9 23:54:32 2015 - [info] Got exit code 1 (Not master dead).
MySQL Replication Health is NOT OK!
Solution:
All nodes are executed once
[root@data02 ~]# type mysqlbinlog
mysqlbinlog is/usr/local/mysql/bin/mysqlbinlog
[root@data02 ~]# ln -s/usr/local/mysql/bin/mysqlbinlog /usr/bin/mysqlbinlog
5. error 5
Thu Apr 9 23:57:24 2015 - [info] Connecting to [email protected](192.168.52.130:22)..
Checking slave recovery environment settings..
Relay log found at /home/data/mysql/data, up to mysqld-relay-bin.000013
Temporary relay log file is /home/data/mysql/data/mysqld-relay-bin.000013
Testing mysql connection and privileges..sh: mysql: command not found
mysql command failed with rc 127:0!
at/usr/local/bin/apply_diff_relay_logs line 375
main::check()called at /usr/local/bin/apply_diff_relay_logs line 497
eval{...} called at /usr/local/bin/apply_diff_relay_logs line 475
main::main()called at /usr/local/bin/apply_diff_relay_logs line 120
Thu Apr 9 23:57:24 2015 - [error][/usr/local/share/perl5/MHA/MasterMonitor.pm,ln205] Slaves settings check failed!
Thu Apr 9 23:57:24 2015 - [error][/usr/local/share/perl5/MHA/MasterMonitor.pm,ln413] Slave configuration failed.
Thu Apr 9 23:57:24 2015 - [error][/usr/local/share/perl5/MHA/MasterMonitor.pm,ln424] Error happened on checking configurations. at /usr/local/bin/masterha_check_repl line 48
Thu Apr 9 23:57:24 2015 - [error][/usr/local/share/perl5/MHA/MasterMonitor.pm,ln523] Error happened on monitoring servers.
Thu Apr 9 23:57:24 2015 - [info] Got exit code 1 (Not master dead).
MySQL Replication Health is NOT OK!
Solution:
#All nodes are executed once
ln -s /usr/local/mysql/bin/mysql /usr/bin/mysql
6. error 6
#The user permissions of the switched machine do not match
Fri Apr 10 00:58:36 2015 - [info] Executing command : apply_diff_relay_logs--command=test --slave_user='manager' --slave_host=192.168.52.130--slave_ip=192.168.52.130 --slave_port=3306 --workdir=/var/tmp--target_version=5.6.12-log --manager_version=0.56--relay_dir=/home/data/mysql/data--current_relay_log=mysqld-relay-bin.000011 --slave_pass=xxx
Fri Apr 10 00:58:36 2015 - [info] Connecting to [email protected](192.168.52.130:22)..
Checking slave recovery environment settings..
Relay log found at /home/data/mysql/data, up to mysqld-relay-bin.000013
Temporary relay log file is/home/data/mysql/data/mysqld-relay-bin.000013
Testing mysql connection and privileges..Warning: Using a password onthe command line interface can be insecure.
ERROR 1142 (42000) at line 1: CREATEcommand denied to user 'manager'@'192.168.52.130' for table'apply_diff_relay_logs_test'
mysql command failed with rc 1:0!
at/usr/local/bin/apply_diff_relay_logs line 375
main::check()called at /usr/local/bin/apply_diff_relay_logs line 497
eval{...} called at /usr/local/bin/apply_diff_relay_logs line 475
main::main()called at /usr/local/bin/apply_diff_relay_logs line 120
Fri Apr 10 00:58:37 2015 -[error][/usr/local/share/perl5/MHA/MasterMonitor.pm, ln205] Slaves settingscheck failed!
Fri Apr 10 00:58:37 2015 -[error][/usr/local/share/perl5/MHA/MasterMonitor.pm, ln413] Slave configurationfailed.
Fri Apr 10 00:58:37 2015 -[error][/usr/local/share/perl5/MHA/MasterMonitor.pm, ln424] Error happened onchecking configurations. at/usr/local/bin/masterha_check_repl line 48
Fri Apr 10 00:58:37 2015 -[error][/usr/local/share/perl5/MHA/MasterMonitor.pm, ln523] Error happened onmonitoring servers.
Fri Apr 10 00:58:37 2015 - [info] Got exitcode 1 (Not master dead).
MySQL Replication Health is NOT OK!
Solution:
#Execute the following authorization statement sql
GRANT CREATE,INSERT,UPDATE,DELETE,DROP ON*.* TO manager@'192.168.52.%';
\Throwable
It is the exception class that begins to appear in php7.0, and it is the parent class of \error \exception
\Error
Inherited \throwable to handle some internal errors of the system, such as memory overflow
\Exception
Inherited \throwable to handle error reports during program execution, or actively throw exceptions (\error can also throw exceptions)
When developing games using python, we will inevitably use the pyGame module, which has a sound function. Using this function, we can add sound effects to our games.
Problem Description:
To use the sound module, we must initialize our game at the beginning of the main function, so we add the following statement at the beginning of the main function to initialize the game.
# Game initialization
pygame.init()
However, when I run the program, I find that the game window flashes back and an error message appears, as follows:
D:\Game\TankWar\venv\Scripts\python.exe D:/Game/TankWar/main.py
pygame 2.0.2 (SDL 2.0.16, Python 3.8.5)
Hello from the pygame community. https://www.pygame.org/contribute.html
Traceback (most recent call last):
File "D:/Game/TankWar/main.py", line 41, in <module>
is_quit_game = run_Game(config)
File "D:/Game/TankWar/main.py", line 22, in run_Game
sounds[key] = pygame.mixer.Sound(value)
pygame.error: mixer not initialized
Process finished with exit code 1
it says I didn’t initialize the mixer!!! We can’t help it. Let’s go according to his error report and initialize the mixer separately.
pygame.init()
pygame.mixer.init()
The following error message still appears, and the game window still flashes back.
D:\Game\TankWar\venv\Scripts\python.exe D:/Game/TankWar/main.py
pygame 2.0.2 (SDL 2.0.16, Python 3.8.5)
Hello from the pygame community. https://www.pygame.org/contribute.html
Traceback (most recent call last):
File "D:/Game/TankWar/main.py", line 42, in <module>
is_quit_game = run_Game(config)
File "D:/Game/TankWar/main.py", line 17, in run_Game
pygame.mixer.init()
pygame.error: WASAPI can't find requested audio endpoint: Could not find the element.
Process finished with exit code 1
Solution:
After repeated tests, I found that it can run normally sometimes, and the above error reports will appear sometimes. Finally, I found a big man’s article and solved this problem.
earphone problem
Because I use a desktop computer and have no audio connected, there has been no audio output device, which causes pyGame to not know where to output the sound (in this case, the audio device cannot be found), resulting in an error. After inserting the audio device (i.e. my headset), it’s solved…
Error message
Solving process
According to the error information, the reason for the error is that the version of the compiled Java code is different from the current version of java used for running. And the compiled version only supports running versions of 52.0 or above. Thus, it can be seen that the Java version currently used for running is lower than 52.0. First of all, you need to understand what is the compiled version and what is the running version. That is, we need to distinguish JRE from JDK.
When we install the Java environment, one version will correspond to two folders, JRE and JDK. JRE represents the Java runtime environment, that is, the Java runtime environment, while JDK represents the Java se development kit (JDK), that is, the Java compilation environment. We can check whether the versions of the two environments are consistent in CMD (as shown in the following figure):
java – version views the version of JRE (running environment). Javac – version looks at the version of JDK (compilation environment). Note: if you cannot successfully view the version by entering the above command, it indicates that there is a problem with the environment configuration. Please refer to here. Back to the point, if you find inconsistencies after checking the version, reconfigure the environment to ensure that the version is consistent and then recompile and run. It should be noted that I didn’t write the code here, and only got the compiled class file, so I can only solve this problem by changing the running java version. From the error message, we can know that after compilation, this code only supports the JRE environment of java version 52.0 or above. Even if we don’t know which java version 52.0 corresponds to, it must be higher than 1.8.0. In order to avoid problems in the future, I plan to directly update the entire java version, that is, replace JDK and JRE with a new version. Also, considering that 1.8.0 may be needed in the future, I will not delete the 1.8.0 version.
Solution
First download the Java version of 1.9, that is, download the installation package of jdk9.0 (JDK package includes JDK and JRE, 9.0 is 1.9). Here is the network disk link of (windows-x64)
extraction code: 63q0 after downloading and installing, you can start configuring the environment. In order to facilitate management, I put 1.9 under the same path as the previous 1.8. As shown in the following figure:
modify the original Java in the system variable_ Home and JRE_ Home path to point to the newly installed java version of 1.9 (if the way to configure the environment is different from mine, it doesn’t matter. In essence, it’s just that the path to point has changed. I suggest this way to configure it for management convenience. Please refer to the configuration link provided above). As shown below
Check the versions of JDK and JRE again (remember to re open CMD after confirmation)
run the code again and run successfully
I was caused by the Chinese name of my windows account
Solution:
Add a parameter such as – duser. Name = user to VM argument
If the jar package is used for startup, execute Java – duser. Name = user – jar xxxx.jar
The following error occurred in the binding mechanism between signal and slot function:
error: no matching function for call to 'Widget::connect(QPushButton*&, void (QAbstractButton::*)(bool), Widget*, <unresolved overloaded function type>)'
The reason for the error is that when making a response call, you do not know which function to call, indicating that function reuse occurs.
void classover();
void classover(QString food);
For the above two functions, you can mask one. Which one?
When signals correspond to slot functions, two characteristics need to be noted:
1. The parameter types of signals and slots must correspond one by one
2. The number of parameters of signals and slots can be different, but the number of signal parameters must be more than that of slot functions
To sum up, the nonparametric function is retained to achieve the correct result.
Android 11 reports an error during OTA package:
ExternalError: Failed to run signapk.jar: return code 1:
Error: A JNI error has occurred, please check your installation and try again
Exception in thread "main" java.lang.UnsupportedClassVersionError: com/android/signapk/SignApk has been compiled by a more recent version of the Java Runtime (class file version 53.0), this version of the Java Runtime only recognizes class file versions up to 52.0
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java:756)
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
at java.net.URLClassLoader.defineClass(URLClassLoader.java:468)
at java.net.URLClassLoader.access$100(URLClassLoader.java:74)
at java.net.URLClassLoader$1.run(URLClassLoader.java:369)
at java.net.URLClassLoader$1.run(URLClassLoader.java:363)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:362)
at java.lang.ClassLoader.loadClass(ClassLoader.java:418)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:352)
at java.lang.ClassLoader.loadClass(ClassLoader.java:351)
at sun.launcher.LauncherHelper.checkAndLoadMain(LauncherHelper.java:601)
According to the error analysis, it is caused by the jdk version.
1. First check the jdk version: java –version My previous version was openjdk-8
2. Use sudo apt-get install openjdk-11-jdk to install openjdk-11
3. Configure linux default jdk version: sudo update-alternatives –config java, select the JDK version you need
4. Configure the default java version: sudo update-alternatives –config javac, select the java version you need.
Just do the ota package again.
The following problem occurs with QT compilation:
error: ‘QStringLiteral’ was not declared in this scope resmodel->setHorizontalHeaderLabels(QStringList()<<QStringLiteral(Name)<<QStringLiteral(Size)); ^ QMetaObject::Connection connRet = QObject::connect(naManager, SIGNAL(finished(QNetworkReply*)), this, SLOT(requestFinished(QNetworkReply*))); error: ‘connRet’ was not declared in this scope Q_ASSERT(connRet); ^ /usr/include/qt4/QtCore/qglobal.h:1940:32: note: in definition of macro ‘Q_ASSERT’ define Q_ASSERT(cond) ((!(cond)) ?qt_assert(#cond,FILE,LINE) : qt_noop()) error: ‘class QComboBox’ has no member named ‘setCurrentText’; did you mean ‘setCurrentIndex’? CombBox->setCurrentText(curX);
There is a situation that is caused by using QT4 to compile code written in QT5 environment, some operating systems have both QT4, QT5, just switch to QT5 is fine
QT Creator “Tools” —- “Options” —- “build&run” – “Build Kit ( kit)”-“qt version” select QT5 on it
You have declared #include & lt; vector> but this error is actually a detail
you may use it directly in the program
vector<int> sim
The vector is in the STD namespace and should be written as follows
std::vector<int> sim
If you want to use the first method, you need to add using namespace STD;