qt dvr

QT Development (35)--qt interprocess communication Qt is a cross-platform application framework, and its interprocess communication mechanism can of course use the inter-process communication mechanism of the platform, such as message mechanism on Windows platform, shared memory, file mapping, pipeline, socket and so on. Among them,

using the AddWidget interface, adding a sub-layout using the Addlayout interface. This interface is not commonly used, and its usage principle is to add addwidget widgets and Addlayout layout to this variable.2) AddWidget (Qwidget *w) adds this widget to the specified layout, using the AddItem3) qsize closestacceptablesize (const qwidget * widget, const qsize size) [Static]Returns the size dimensions that meet all throttling policies to the widget, including Heightforwidth (), and as close to s

IfProgramFor example, if you need to load a large amount of data in advance, the program generally has a startup screen. In this way, the user can see that the program is being started rather than simply waiting for it. It also displays some useful information about the program, such as the Program Logo, function module, or product information. In the QT application, you can use the qsplashscreen class to start the screen. The following is a simple

Qt Address Book (2) Add addresses, qt Address Book add addresses In the last Qt Address Book (I) interface design, we mainly implemented the address book interface and used the layout manager to layout elements, it also explains the concepts of "subclass" and "ownership. In this article, we will add three QPushButton buttons on the interface to save the Name and

Qt custom tag button and qt custom tag When you get started with Qt, you will be surprised by its extremely convenient cross-platform approach and want to try Qt. Gradually, you will find that some of Qt's built-in controls cannot meet your own needs. At this time, we need to define our own controls. In general, there

I started to learn QT creator. Today I installed it on both Linux and Windows. in Linux, I can compile and execute my ownProgramIn Windows, a problem occurs. When executing the program, the system prompts "mingwm10.dll cannot be found". The solution is to statically compile the QT library. Steps: 1. Call QT command prompt in the Start Menu, 2. Run configure

QT provides good support for JavaScript, and if you look through the documentation, you know that QT has two different JS package engines: Qscriptengine Qjsengine Qscriptengine appears earlier (since Qt4.3), based on WebKit's JavaScriptCore engine, which provides relatively rich APIs, but has been officially labeled deprecated Qjsengine is the official version of the Qt5.0, based on Google

array of wchar_t to hold Unicode charactersSecond, the character, string in QTQt as a cross-platform framework, the design of the first consideration of the character of the problem;It encapsulates a qstring representing a string, which is a UTF-16 encoded class, and encapsulates a Qchar class that represents a wide character;Then there's the problem: the code in VS is GBKSo just assign the string to qstring as follows:QString str = "A section of Chinese"; Ui.lineedit->settext (str);Running out

How does the Qt application process Chinese parameters during drag-and-drop, and qt drag-and-drop Chinese parameters? You have developed an application using Qt. When you drag and drop a file to your exe and start your application, the main () function may receive Chinese parameters. How can this problem be solved correctly? The Code is as follows: QTextCodec

Qt recursive non-recursive traversal file, qt recursive non- The biggest advantage of qt is that it is cross-platform. Although it is said that qt is well-designed and has a wide range of documents, qt has never been so cool. However, cross-platform architecture can save a l

QT multithreading notes and qt Multithreading 1. it is not convenient to use QThread when QT multithreading involves a large amount of data interaction between the main thread and sub-thread, because the run () function itself cannot accept any parameters, therefore, data can only be obtained through the interaction between the signal and the slot. If only the si

Design of the waiting dialog box in Qt and the waiting dialog box in Qt A waiting dialog box is used to prompt the user to operate the Qt program for a long time.Qt has a standard QProcessDialog to partially implement this function, but the disadvantage is to calculate the progress. Second, you can cancel it halfway. Therefore, we generally use a custom dialog b

The words are connected to the article. After successfully configuring Qt+lua+tolua, we can implement classes that use each QT in a Lua script. Look directly at the code.#include "include/lua.hpp" #include The author writes several functions of qwidget into the form of static and binds them with Tolua. This makes it possible to use a bound function smoothly in a LUA script. The contents of the following LUA

Qt Property system QT provides a clever property system similar to the property systems supported by some compilers. However, as a platform-and compiler-agnostic library, QT cannot rely on non-standard compiler features such as __property or [property]. QT's solution can be supported by standard C + + compilers under any QT