Rongyun integration error code summary
Rongyun integration error code summary Recently integrated Rongyun IM SDK, an error code was encountered during the process, then you need to go to the SDK header file to find the corresponding error code to check the reason. I have sorted out the following for everyone, I hope to help you, if you have any questions, you can contact Rongyun technology: 30007: The navigation HTTP request failed. Suggestion: Change the network environment. If it cannot be solved, contact the server for troubleshoo
Concluding thoughts caused by a SMS verification code function
Explore the technology behind simple functions. story Yesterday, I saw an address where new users can receive a 14-day membership of the XDeng reading APP for free. It's 2020, and it's about to start reading. Seeing that the activity is on the laptop, I use the laptop browser to visit the activity page , enter the phone number, receive the verification code, fill in the verification code, and claim this member. I thought that everything ended smoothly in this way, but it was not. Filling in the
Flutter Widget source code analysis and actual combat
Widget The elements displayed on all pages in flutter are composed of widgets. The difference from native android development is that widgets in flutter not only represent UI elements, they can also be completely unrelated to UI such as GestureDetector, which inherits from GestureDetector StatelessWidget The function of Widget is similar to the style file in native android development, which is used to describe the style of UI. The element that is actually drawn on the screen is finally @immutab
"Super detailed! ArrayList source code graphic analysis"
An unpoetic female program lady is not a good cook~ Please indicate the source for reprinting, From Li Shiyu---[ blog.csdn.net/cjm24848365... ] Yesterday we played arraycopy for a long time, today let's take a look at the source code of ArrayList. Yes, it's time to use my poor drawing skills again~ First preview the outline of this article: Let's start the journey of ArrayList's source code diagram. Let's start with the addition, deletion, modification and investigation, and then talk about the
How do you think about H5 full-stack development to develop apps?
How do you think about H5 full-stack development to develop apps? In recent years, with the rapid development of HTML5, industry giants such as Microsoft, Apple, and Google have all shown their favor. The demand for HTML5-related positions has increased year by year, and industry salaries have soared. Due to the rich media and rich application of HTML5, there is no front-end development language that can replace the mainstream development status of HTML5. Whether it is a PC-side website or an Ap
With just 10 lines of Python code, we can realize the target detection imageai in computer vision
With just 10 lines of Python code, we can achieve target detection in computer vision. from imageai.Detection import ObjectDetection import os execution_path = os.getcwd() detector = ObjectDetection() detector.setModelTypeAsRetinaNet() detector.setModelPath( os.path.join(execution_path , "resnet50_coco_best_v2.0.1.h5")) detector.loadModel() detections = detector.detectObjectsFromImage(input_image=os.path.join(execution_path , "image.jpg"), output_image_path=os.path.join(execution_path , "imagene
Step by step to build a Flutter development shelf-chart
Speaking of charts, I searched for information and saw that there is a flutter_echarts library, which, as the name suggests, is our commonly used echarts component library. Now that there is a ready-made library, just use it directly. But I took a look at how people write plug-ins with a learning attitude. Analyze a wave The introduction of the flutter_echarts plug-in and how to use it, let s not talk about it. If you are anxious, go directly to the portal. The ultimate goal is to learn the enti
Flutter elegantly distinguishes development and production environments
update record introduction So how can we switch to a different environment without breaking the existing code after we test and develop it? Create different environments the way Directory Structure Define configuration Initial configuration run Bale Android Build configuration specified environment Like, follow, Star References update record <2020-12-26 Sat> Android Build introduction At least two different environments are often encountered in APP development: a test environment and a pr
Django-based video-on-demand website development-step2-building environment
In this lecture, I will lead everyone to build a development environment. We will install python, pip, django, mysql and other necessary libraries in sequence. Install python Installing Python is very simple. Go to the official Python website to find the download address of Python3. Choose the 32-bit or 64-bit installation package according to your system. After downloading, double-click to install. After the installation is complete, enter python -v on the command line. If the version number of
Why should Tencent's self-developed trillion-level messaging middleware TubeMQ donate to Apache?
Introduction | Recently, the cloud + community technology salon "Tencent Open Source Technology" came to a successful conclusion. This salon invited a number of Tencent technical experts to discuss with developers around Tencent open source, revealing in depth the Tencent open source projects TencentOS tiny, TubeMQ, Kona JDK, TARS and MedicalNet. This article is a compilation of teacher Zhang Guocheng's speech.Key points of this article:Principles and characteristics of Message Queue;TubeMQ rela
Use the CAP model to create Fiori applications in the SAP cloud platform ABAP programming environment
Create the necessary CDS view, activate, and then create a behavior definition based on the CDS view: @Semantics.user.createdBy: true key holiday_id, @Semantics.user.lastChangedBy: true month_of_holiday, @Semantics.systemDateTime.createdAt: true day_of_holiday, @Semantics.systemDateTime.lastChangedAt:true changedat The CDS view based on the behavior definition is the previously created ZCAL_I_HOLIDAY_JERRY: The implementation code of this behavior definition is as follows: managed; // implementa
A problem with the skyrocketing of threads in the Go program system
Recently, a problem that the number of threads in the Go program system has skyrocketed has been fixed. The number of threads has remained at 2 to 30,000, and sometimes even more. This situation is obviously not in line with Go's concurrency principle. The first time I found that the number of threads is so large because the program suddenly crashed. Since the maximum number of threads available for the program is set, the number of threads will crash if there are too many threads.This program i
How does a programmer obtain GPS information through a picture? Too simple to believe
The text and pictures in this article are from the Internet and are for learning and communication purposes only. They do not have any commercial use. If you have any questions, please contact us for processing. The following article is from struggling cyanobacteria Preface How to get the GPS information of a picture with python? Today I recommend exifread this amazing library, not only GPS information, but almost all the information of the picture can be obtained, come in and have a look! ! How
Analysis of the operation principle of java program
class file content The content of the class file contains the bytecode executed by the java program , and the data is arranged in a binary stream in the class file in strict accordance with the format, without any separator in the middle; there is a special flag of 0xcafebabe (hexadecimal) at the beginning of the file . JVM runtime data area The final execution of the java program is some adaptations made by the JVM execution engine and the local library , so the execution engine and the local l
Loved love! SpringBoot+Netty distributed instant messaging system, with source code!
Recently, the company's development needs to use the IM system. If you develop it yourself, it will take more time and energy. So we considered secondary development on the basis of open source projects. After comparing more open source solutions, we chose CIM . Project Description The CIM (CROSS-IM) project is an instant messaging system for developers. The project is based on the currently popular SpringBoot ( The Spring Boot version that the project depends on is 1.5.x, you can upgrade to
Hand in hand, use uni-app to develop a small video program from scratch (Development of actual combat in the series)
Series of articles Hand in hand, use uni-app to develop a small video program from scratch (preparatory work in the series) Hand in hand, use uni-app to develop a small video program from scratch (Development of actual combat under the series) Scan code experience, see it soon You can scan the QR code of the WeChat applet to experience the effect of the development Code address: GitHub: https://github.com/Tzlibai/uni-app-video - Star 100+ Uni-app plug-in market address: https://ext.dcloud.net.cn
[Performance optimization notes sharing] Github has starred 72k limit! Ali throws out 878 pages of performance optimization notes!
Preface Since we entered the software industry, the importance of performance has been repeatedly emphasized. While studying, we learned a lot of computer professional courses and spent a lot of time discussing how to make our computer system get better performance. And when we look for a job, most companies will test the algorithm and ask about the complexity of the algorithm during the written test and interview. Being able to write programs with lower time complexity and better performance th
Back-end performance optimization
1. What is system optimization One aspect of system optimization is to systematically analyze and optimize each link in the IT system or transaction chain, and the other is to analyze and optimize the bottleneck point of a single system. But the goal of optimization is roughly the same. It is nothing more than improving the response speed and throughput of the system and reducing the coupling of each layer to cope with the market for flexible counterparties. Three levels of system optimization:
Common performance optimization techniques in iOS development
What are the main causes of performance problems? The reasons are the same and different, but in the final analysis, it is nothing more than memory usage, code efficiency, appropriate strategy logic, code quality, and installation package size. But from the perspective of user experience, when we are in a position to play an app as a user, what do we care about? If you are playing a mobile game, first of all you don't want to play and crash suddenly, then you don't want to freeze, secondly, you
ORACLE performance optimization ideas, related commands and parameter modification
Summary of ORACLE performance troubleshooting reasons Preface This article is mainly for the guys who have nowhere to start with performance> With a direction for guidance, the real optimization process, meticulously analyzes each waiting event in Oracle, analyzes the execution plan of each SQL, and analyzes hot data. The content is quite a lot. The performance investigation of oracle I summarized mainly from three directions Server resource usage Oracle parameter settings awr report analysis