Vs + QT reports an error “vs cannot open the source file qchartview”
Just started to develop QT program with VS, not familiar with VS, #include & lt; QChartView> always reports an error and cannot open the source program. The solution is as follows:
add the two directories shown in the figure to the included directory. If qtcharts are not found, it indicates that qtcharts was not installed when QT was installed, and the qtcharts component needs to be reinstalled.
In the Vue project, the parent component uses $ref to call the method of the child component to report an error. At first, the console will report an error. When the pop-up window is closed and the page is not refreshed, the solution is simple and crude~
Both methods are OK, but the second is more intuitive optimization.
The first method uses a timer to solve the problem that the method is not loaded because the sub components are not mounted when the ref attribute is initially rendered. At this time, this method does not exist, so it cannot be accessed. Add a timer to delay execution. However, if the data is displayed one second later, you will directly see the loading problem of this page;
Therefore, the second method is more appropriate to solve the problem that DOM elements are not loaded. Let the method wait
Project scenario:
Version inconsistency and error report during using Visual Studio
Problem Description: error msb8020
Problems encountered during execution:
Error
error msb8020: the build tools for visual studio 2012 (V120) (platform toolset = ‘Visual Studio 2012 (V120)’) cannot be found. To build using the visual studio 2012 (V120) build tools, please install visual studio 2012 (V120) build tools. Alternatively, you may upgrade to the current Visual Studio tools by selecting the Project menu or right-click the solution, and then selecting “Upgrade Solution…”.
Cause analysis:
Use Microsoft Visual Studio Version for inconsistent reasons
Solution:
Find the solution manager, right-click and select Properties
configuration properties – & gt; General – & gt; Platform toolset – & gt; Select the current version of visual studio
Summary
step by step, lyy come on
Problem description
com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failureSolution
Option 1 Tomcat VM configuration parameters: – DJava. Net. Preferipv4stack = true
Option 2 ① Nginx configuring agent MySQL:
② Modify database connection: spring. Datasource. Url = JDBC: mysql://localhost:9999/demo?characterEncoding=utf8
Reference from:
https://blog.csdn.net/baidu_21349635/article/details/121032229
https://adong.blog.csdn.net/article/details/111501253Using Mars technology’s mars3d API and several video fusion written according to the sample code, clicking different web page tags will fly to different locations and turn on Video Fusion there.
var video3D = new mars3d.graphic.Video3D({
// type: mars3d.graphic.Video3D.Type.Image,
// url: videoInfo.pic_url,
type: mars3d.graphic.Video3D.Type.Video,
dom: $("#trailer"),
position: videoInfo.position,
cameraPosition: videoInfo.cameraPosition,
style: videoInfo.style,
showFrustum: videoInfo.showFrustum,
});
gLayer.addGraphic(video3D);
map.setCameraView(videoInfo.view);
However, glayer. Addgraphic (video3d) often appears; report errors. The first call is sure to succeed, and then the second call may fail. After a failure, all methods fail, which will also prevent the call of other methods, such as flight. Error message: unable to:_ 0xc3d9ee add addeventlistener.
After debugging, I found that this DOM element was obtained for the first time
the second time, it was just (forgot the screenshot):
dom:{
selector:#trailer
}
Therefore, the specific reason for the problem is not clear, but it must be related to jQuery. The second time, I don’t know why I didn’t get the DOM elements completely and then pass them in
No, jQuery is fine anyway:
var video3D = new mars3d.graphic.Video3D({
// type: mars3d.graphic.Video3D.Type.Image,
// url: videoInfo.pic_url,
type: mars3d.graphic.Video3D.Type.Video,
dom: document.getElementById("trailer"),
position: videoInfo.position,
cameraPosition: videoInfo.cameraPosition,
style: videoInfo.style,
showFrustum: videoInfo.showFrustum,
});
gLayer.addGraphic(video3D);
map.setCameraView(videoInfo.view);
Original file connection: unity about the error report of newtonsoft. JSON reference!!!! (resolved)_ Xiaoyan can’t write code blog – CSDN blog
I’m afraid the original article will be deleted once.
1、 Download the newtonsoft.json.dll library
https://www.nuget.org/packages/Newtonsoft.Json/
After downloading, change the downloaded file to a. Zip file and unzip it. After decompression, find the newtonsoft.json.dll file in the directory:… \ newtonsoft. JSON. 13.0.1 \ lib \ netstandard2.0 and copy it to the… \ assets \ plugins \ netstandard2.0 directory of unity.
2、 Modify unit settings
ProjectSetting-> Player-> API compatibility level changed to. Net 4. X
Create a new link.xml file in the assets directory of the unity project:
<linker>
<assembly fullname="System.Core">
<type fullname="System.Linq.Expressions.Interpreter.LightLambda" preserve="all" />
</assembly>
</linker>As a video streaming media player developed by tsingsee Qingxi video, easyplayer series projects support integration and secondary development. You can also download and try to obtain real test results. Among them, the new h.265 player branch easywasm player is the mainstream player for web page playback.
When we use easywasmlayer to play video in the project, the console will always report the error uncaught (in promise) domexception. In this article, we will analyze what caused the error.
In fact, this problem is caused by the browser’s blocking automatic playback. The user has set automatic playback, so this situation will occur when the first screen is loaded. To deal with this situation, you can disable the audio.
Changing openaudio to true disables audio or prevents the player from loading as soon as the first screen comes up, but this is obviously not the problem in this project. Instead, open the playback page, select the device to start playing, and then start loading the player. After modification, it can play normally:
Easyplayer, a player independently developed by tsingsee Qingxi video, is currently being effectively used on multiple platforms and supports integration. It also includes players such as easyplayer RTSP, easyplayer RTMP, easyplayerpro and easyplayer.js, which has higher availability and lower latency. Welcome to know.
When writing wechat applet, use the dialog pop-up box of the third-party vant web to prompt the path error
But it is used according to the official tips
After repeated modification, the path still reports an error. According to the hierarchy, the path is no problem
The problem of path error will still be reported!
Finally, after repeated attempts, the package/dist needs to be removed and can be used normally
Recently, I encountered a problem. When I redeployed a service in docker, I failed to start the service after executing the SH start.sh command or docker compose up – D command, and reported a device or resource busy error.
Then I docker PS a look, good guy, not only failed to start, the service is not available yet
this is because when docker is deployed, all the original things will be RM repeated and then rebuilt. Well, the deletion was successful, but the deployment was not started successfully.
Take a look at the error reported at that time:
failed to remove root filesystem for 9b13c255d03757c456651506ada5566a5b5e5a87b851e3621dcejf823: remove /var/lib/docker/overlay/9b13c255d03757c456651506adaa2fb660f75a5b5e5a87b851e3621dce0a368d/merged: device or resource busy
Device or resource busy, which means that the device or resource is busy and you can’t delete it.
Then I went to the/var/lib/docker/overlay/9b13c255d03757c756651506adaa2fb660f75a5b5e5a87b851e3621dce0a368d/merged directory. It was empty and could not be deleted manually.
terms of settlement
1. Find the processes occupying this directory
Command: grep ID/proc/*/mounts
examples are as follows:
grep 9b13c255d0375757c456651506adaa2fb660f75a5b5e5a87b851e3621dce0a368d/proc/*/mounts
After executing the command, it is obvious that two processes are using it:
/proc/25086/mounts:overlay /data0/docker/overlay2/9b13c255d03757c456651506adaa2fb660f75a5b5e5a87b851e3621dce0a368d /merged overlayrw,relatime,lowerdir=/data0/docker/overlay2/l/F4BQHNVPHGRKWXFRUIHXUMAHZ2:/data0/docker/overlay2/l/.....
/proc/25065/mounts:overlay /data0/docker/overlay2/9b13c255d03757c456651506adaa2fb660f75a5b5e5a87b851e3621dce0a368d /merged overlayrw,relatime,lowerdir=/data0/docker/overlay2/l/......
2. Kill the process
Command: Kill – 9 process ID
examples are as follows:
kill – 9 25086
kill – 9 25065
Note: it is important to see whether some processes can be deleted directly. If they are deleted all at once, it will be bad in case other services are affected.
3. Continue to delete the directory. The operation is successful
Command: RM – RF error file path
example:
RM – RF/var/lib/docker/overlay/9b13c255d03757c456651506adaa2fb660f75a5b5e5a87b851e3621dce0a368d/merged
After deleting the directory file, re execute the SH start.sh or docker compose up – D command to start the service, and the start is successful!
SAP mm receives the purchase order and reports an error – table t169p entry znmi does not exist-
The following purchase order 4500000754,
Execute the transaction code Migo. For the receipt of 101, the error is reported as follows:
Error message: table t169p: entry znmi does not exist
Znmi is a newly created company code. This error is likely to be missed in some configurations.
Se12 look at this t169p table,
It seems that something related has been omitted. After investigation, the following configurations need to be completed:
Maintain a new entry, as shown in the figure above.
Then there is data in t169p table, as shown in the following figure:
Try Migo receiving again and it will be successful!
-Finish-
Written on November 15, 2021
Find find HBase dependency. Sh
in kylin’s bin directory. Replace HBase common [a-z0-9a-z. -] * jar with the name of your own HBase commonjar package.
1. Find problems
Phenomenon: restart the Hadoop cluster, and the namenode reports an error and cannot be started.
Error reported: 
2. Analyze problems
As soon as you see the word “outofmemoryerror: Java heap space” in the error report, it should be the problem of JVM related parameters. Go to the hadoop-env.sh configuration file when. The configuration file settings are as follows:
export HADOOP_NAMENODE_OPTS="-Dhadoop.security.logger=${HADOOP_SECURITY_LOGGER:-INFO,RFAS} -Dhdfs.audit.logger=${HDFS_AUDIT_LOGGER:-INFO,NullAppender} $HADOOP_NAMENODE_OPTS"
export HADOOP_DATANODE_OPTS="-Dhadoop.security.logger=ERROR,RFAS $HADOOP_DATANODE_OPTS"It can be seen from the above that the size of heap memory is not set in the parameter.
The default heap memory size of roles (namenode, secondarynamenode, datanode) in the HDFS cluster is 1000m
3. Problem solving
Change the parameters to the following, start the cluster again, and the start is successful.
export HADOOP_NAMENODE_OPTS="-Xms4096m -Xmx4096m -Dhadoop.security.logger=${HADOOP_SECURITY_LOGGER:-INFO,RFAS} -Dhdfs.audit.logger=${HDFS_AUDIT_LOGGER:-INFO,NullAppender} $HADOOP_NAMENODE_OPTS"
export HADOOP_SECONDARYNAMENODE_OPTS="-Xms4096m -Xmx4096m -Dhadoop.security.logger=${HADOOP_SECURITY_LOGGER:-INFO,RFAS} -Dhdfs.audit.logger=${HDFS_AUDIT_LOGGER:-INFO,NullAppender} $HADOOP_NAMENODE_OPTS"
export HADOOP_DATANODE_OPTS="-Xms2048M -Xmx2048M -Dhadoop.security.logger=ERROR,RFAS -Xmx4096m $HADOOP_DATANODE_OPTS"Parameter Description:
– Xmx4096m Maximum heap memory available
– Xms4096m Initial heap memory
Reference: HDFS memory configuration – flowers are not fully opened * months are not round – blog Park