qt dvr

Let's talk about the method of calling the QT Dynamic link library, mainly including:1, explicit link DLL, call DLL global function, using QT Qlibrary method2. Show link DLL, call DLL class object, member function. (A call to a class member function can be implemented through an object)① uses the method of virtual function table, which is also the method used by COM, using QT's qlibrary technology call;② is

[Qt Summary] Final Summary, qt Summary Final 1. content about Qt applications: Refer to the previous article: [Qt Summary] terminal remote client upgrade 2. Upgrading files is a processing method in hex format: for files in hex format, If You Want To directly read the files, you need to: 1. Read data 2. Find the requi

This article original in www.yafeilinux.com reprint please indicate the source.Now let's implement the picture on the window and learn how to pan, zoom, rotate, and twist the picture. Here we use the Qpixmap class to implement the image display.First, the use of qpixmap display pictures.1. Make a copy backup of the previous project folder, and here we rename the project folder to Painter05. (as I've said before, it's a good habit to back up the engineering catalog often.)2. Create a new folder i

Tags: arc base experience creat DDD database technology sharing include cannotFollowing the continuation of the previous article:The previous article said, "finally write a demo of my SQL Project discovery can run successfully, but could not find the database file created reason to find"Note that the corresponding code for the above problem is as follows:#include 　The cause of the problem is:Query.exec ("CREATE TABLE student (ID primariy key, name varchar (20))");This line of code is now correct

I. Advantages of QT: 1. cross-platform2. the signal-slot mechanism is too elegant. Compared with MFC, its non-Form class also supports this mechanism. This designer's idea is admirable, and because its non-Form class also supports this mechanism, so many of its usage makes people feel bright, such as the use of qtimerevent, whether it is a form or not, can support timer, this is much more flexible than MFC3. Easy to use. Many mechanisms are similar to

Looking for a long time on the internet, everyone mentions a QT global Gellicoux (qxtglobalshortcut), which supports cross-platform. In this article, I will only show the settings for the global hotkey under the Windows platform.The method provided here is to complete the API encapsulation of Windows in Myglobalshortcut and use it in main.cpp.Directly on the code:Mywineventfilter class:Class Mywineventfilter:p ublic qabstractnativeeventfilter{PublicMy

QT 5 Introduction qt 5 Overviewin this version of QT 5, QT Quick became the heart of Qt. But QT 5 also continues to provide powerful local C + + capabilities to achieve a better user experience, as well as full support for Opengl/

Qt shortcut key ing "ESC",/* QT: key_escape 0x01000000 */"tab",/* QT: key_tab 0x01000001 */"Shift + TAB ", /* QT: key_backtab 0x01000002 */"backspace",/* QT: key_backspace 0x01000003 */"return",/* QT :: key_return 0x01000004 */"en

In simple terms, LUA's dynamic features complement the functionality of C + +. Of course, it depends on how you use it.I often use QT, so I'm ready to combine QT with Lua. Imagine calling the following code in a LUA script:W = qwidget:new () w:show ()And then pop up a qwidget window, what a touching thing it is.OK, let's start configuring the environment below.1. Download Lua 5.1. The current version is 5.2

If you want to know about QT and VS2013 development environment, you can turn this page.Here the main sharing environment has been built successfully, in the construction of projects encountered error solution."1" Qt and VS2013 development environment construction times wrongThe error interface is as follows:Note: In the upper left corner of the dialog box, QT Vi

Introduction: QCA: QT cryptographic architecture is a very good class library for encryption and decryption on the qt platform. However, there are still few documents and blogs about QCA in China, if you are not familiar with QT and Unix development, you may encounter some problems when using this open-source class library (as you know, there are still many probl

After some tangle, I still think swing is too much .. Continue QT However, QT does not seem to be covered either. It takes a long time to configure the environment .. Output Hello QT first this time! However, the box after running is too small. Although you can enlarge it by yourself, you do not know if you can call it during initialization? Come on .. The

Im servers are being developed recently and require high-concurrency connections. Qt uses the select model by default. This round robin mode is very slow. For highly concurrent connections, we need epoll to take advantage of the performance of the Linux server. in addition, it is easy to use, and the entire server code architecture does not need to be modified. You can set the QT distribution event, as long

Download and install the qt sdk. The IDE looks very good. Select the Vim (dark) style and it is suitable for long-term reading. [1. Hello word] // Create the qt gui Program # include [2. Embed HTML to draw color text] # Include [3.advantages and disadvantages of QT creator] After using QT Creator for a short per

Qt static compilation and qt static Compilation Compile Parameters Configure-confirm-license-opensource-developer-build-static-prefix D: \ libraries \ Qt5.3.1s-mp-platform win32-msvc2013-opengl desktop-no-angle-nomake examples-nomake tests-no-icu-no-openssl-qt-libjpeg-qt-libpng-no -plugin-manifests-skip qtwebkit-skip

Set the single startup method of the program in QT: 1. Copy the qtsingleapplication directory to the source code directory of the project and add the file to the code. 2. Add the QT-connected Library to the Pro file. Qt + = Network 3. Code in the main function # Include Qtsingleapplication app (argc, argv ); If (App. isrunning ()){App. sendmes

Qt Introductory Learning--QT 5 How to use the Help documentLearning graphic interface development, is certainly inseparable from the use of help documents, because it does not like C language as a few function interfaces, graphics interface can be used to describe the interface, the common we may be able to remember, the other really do not need to remember, use what to help document viewing usage.We use

These two days in summing up some of the previous problems encountered in project, just do not have a colleague asked me about Qt in the various widget window position is how to define, here is summed up:In Qt, all problems are divided into two different situations: one is the most commonly used qwidget system, and the other is the Qgraphicswidget system.①: In the commonly used qwidget system, the position

Today I want to use LUA for data manipulation in QTIt turns out that there are fewer articles using LUA in Qt, though it's simple, but it's written to provide a primer, by the way, to recordI'm using the QT Creator 3.4.2, with the mingw4.9.2 compiler.The LUA version I downloaded on the LUA website is 5.3.1First, in the QT to compile Lua, get. A and DLL these two

1. Drawing graphics [CPP]View Plain copy protected:void paintevent (qpaintevent *); void Widget::p aintevent ((qpaintevent *event) {qpainter painter (this);//this as a drawing device, that is, drawing on the part Painter.draw Line (qpaint (0, 0), Qpaint (100, 100)); } qpainter painter (this); Will immediately begin drawing on the device, call the Begin () function automatically, and then call the end () function in the destructor to finish drawing. Qpainter painter;//without parameters, you ca