Programmer Group

Because the current C + + project needs to use ajax library to post to call the ashx interface, the interface address is as follows:   The parameters to be passed are as follows:   Then it is found that qml is better to call ajax.js library, so this chapter uses C + + interface to get qml method to call ashx interface (take a C + + interfac ...

1. Preface Device playback module is added later, the core is to play real-time and historical videos by combining rtsp video stream addresses. At present, many manufacturers such as Haikang, the number one on the market support direct rtsp to play a channel video stream and playback a channel video stream through NVR. These formats can be sear ...

I. Preface Similar projects have been done many years ago. It's just to upload the local pictures to the server. It's so simple. In fact, it's easy to upload with http post. You don't need to customize the protocol. You can directly set the binary data. If you use TCP or UDP communication, you must customize the protocol, because you don't know ...

background Recently, it's more and more hard to watch the computer at work, and my eyes are more and more uncomfortable. Occasionally, a few tears will come out. At this time, I finally realized that it must be excessive use of eyes. On average, I stare at the screen for no less than eight hours every day, and my eyes don't get pro ...

1. Preface As a management system, the database is absolutely indispensable. Qt's built-in sqlite database is enough, and I can test the amount of data personally to support hundreds of millions of levels, rather than tens of millions of levels as many people on the Internet say. I have simulated more than 100 million data, and still can query ...

Reprinted from: https://www.cnblogs.com/retry/p/9328715.html QChar of QT QChar class is a class used to represent a character in Qt, which is implemented in QtCore shared library. The QChar class internally represents a character in 2-byte Unicode encoding. Coding //char type is a built-in type in c/c + +, which describe ...

Let's see the effect first: Is it cool? Do you want to? Want it. Of course the author knows you must. Otherwise it won't come in at all, right. Okay. Get to the point. 1. Overview This is a simplified version made following the calculator that comes with win10. It is made with Qt and the whole expression is directly entered and the resul ...

I. Preface Communication protocol analysis is the core soul of the whole system. Most people do software and hardware communication development. The first step is to write demo to analyze the protocol, and then slowly write the whole interface and operation process. In the field of industrial control, modbus protocol is widely used. This system ...

I. Preface The overall framework consists of two parts, one is the UI interface framework, such as the overall layout of the primary and secondary navigation menu buttons, the other is the project framework, the previous article said the project framework, this article said the interface framework, Qt interface is very fast and efficient, espec ...

This part of the development is really troublesome. Maybe the hair is a little sparse. In the process of development, it was found that the login effect and the way of link simulation login were a little lacking. At last, it was decided to adopt CS framework to separate the front end and the back end, so write the inte ...