qt tutorial c

group number: 302558294 Qt, C + + learning Exchange Group welcome you. This group replaces administrators once a week. Selection conditions: 1, actively for the group of friends to solve Qt, C + + problems encountered. 2, to share the study of high-quality learning materials. 3, high degree of activity, improve the learning atmosphere of the group. Want to be an administrator, want to get prog

QT Voice is already a voice tool, so the open method is quite simple, the following steps. 1 first confirm that the video device is properly connected and ready to live. 2 by the administrator in the Stage Central video box click the "+" button, selected artists on stage performance (note: If the administrator for artists, can also perform on their own stage) 3 Select the camera, and adjust the good picture, click the "Confirm" button to ope

HTML>Scriptlanguage= "JavaScript"> functionQtcalljs () {alert ("SDFSD"); } functionjscallqt () {mainwindow.dosome (); }Script>Body>Buttononclick= "JSCALLQT ()"style= = "height:20px;width:100px"/>Body>HTML>Qt.h:#ifndef Qttt_h#defineQttt_h#include#include#include#include#include#include"ui_qttt.h"classQTTT: Publicqmainwindow{Q_object Public: qttt (Qwidget*parent =0, Qt::wflags flags =0); ~qttt ();Private: Ui::qtttclass Ui;PrivateSlots:voidpop ();

possible, otherwise it will also put the interface card dead;2, the timer is not accurate, because it needs to be placed in the event loop processing, so if other events occupy more events, will cause the timer is not accurateThird, create the threadIn Qt, thread-related classes:Qthread: ThreadQmutex: Mutual exclusion lockQsemaphore: Signal VolumeMethods for creating Threads:1. Derive a thread class, inherit from Qthread, and then rewrite the entry f

How to install Qt Chart 5.7.0 can refer to this blog post http://blog.csdn.net/accelerated1987/article/details/50564312.After the installation is complete, create a new widget project, and then add the components by following the steps below.1 . Add QT + = charts in Pro file. 1. Add a widget component to the interface using QT Creator, and then promote to Qchartv

Application Requirements:There is such a requirement in the development of the network disk. That is, the file version number control, that is, the record file version number of the replacement information, where the replacement information is not recorded in a different time file changes, that is, the file of the increase, deletion, alteration, renaming and other operations. A file is saved under each folder to be monitored. Record incremental information for file changes. Each time the low ver

this place, and if you use qurl::fromlocalfile for processing, you can open the folder normally:QDesktopServices::openUrl(QUrl::fromLocalFile(QApplication::applicationDirPath()+SAVEDIR));In addition, there is a problem with this code-Independent: QT Call VC write dynamic Library, VC need to use C way output function, otherwise MinGW32 compile process will error, namely:Example VC DLL header file:? 12345678910111213 #ifndef cdoublere

verified by the validator validator or the input mask inputmask, or both, in order to ensure the validity of the input content, to a large extent can avoid the difficulty of the input diversity check.1. Qlineedit Important attributes1) Echomode, decide how to input and display text to use, output display mode, Echomode echomode access, Setechomode (Echomode) to set2) Acceptableinput:bool, whether the input satisfies the InputMask and validator authentication, is used to specify the content form

Environment:windows 7 + VS2013 + Qt5.3.0 + addin1.2.4Analyse: .vcxproj.user is user profile, saving user data. when you create a QT application project, you will Add the following two lines of content to the. vcxproj.user file . //indicates the absolute path of the Qtdirlocaldebuggerenvironment>//JOIN environment variable vs this two-line content obtains the Qtdir path, before joins the running environment.So when uploading the code, you need t

Introduction to qt animation and qt AnimationThe Qt-4.6 adds the Animation Framework, which allows us to easily write some vivid programs. Like in previous versions, all controls are boring and stay in the great and glorious QLayout. Maybe they can sing a song and dance.The so-called animation has different States at different time points within a period of time.

C ++ memo-QT (3), Memo-qt Guess digital games All content of this blog is original, if reproduced please indicate the source http://blog.csdn.net/myhaspl/ Main. cpp /* * Guess digital games * Author: http://blog.csdn.net/myhaspl * Date: 2015.02.25 */ # Include # Include "guessdialog. h" Intmain (intargc, char * argv []) { QApplicationapp (argc, argv ); GuessDialog * myDialog = newGuessDialog; MyDialog-> sh

Summary of the QT open file dialog box, And the qt open file dialog boxQstring fileName = QFileDialog: getOpenFileName (this, tr ("open file"), "", tr ("Allfile (*. *); mp3file (*. mp3) "); Note: a dialog box is generated, which is similar to the system resource manager. The absolute path of the selected file is returned. Parameter 1: parent windowParameter 2: The title of the dialog boxParameter 3: Default

Let's continue with the standard dialog box of QT. This time we will talk about qcolordialog. This is the color selection dialog box provided by QT. It is also easy to use qcolordialog. QT provides the getcolor () function, which is similar to the getopenfilename () function of qfiledialog and can directly obtain the selected color. We still use the previous qact

Label: style blog HTTP Io OS AR for SP File Common QT classes Output text to the console In the first example, we use STL: Console. cpp #include In the second example, we use the qt4 programming library. Console2.cpp #include Output console applicationQfile Write a line of string to the file File. cpp #include Output $ cat myfile You make me want to be a better man. The following example shows how to output a piece of text to the console

Qt Style Sheets Examples We'll now see a few examples to get started with using Qt Style Sheets. Style Sheet Usage Customizing the Foreground and Background Colors Let's start by setting yellow as the background color of all qlineedits in an application. This could is achieved like this: Qapp->setstylesheet ("Qlineedit {background-color:yellow}"); If we want the property to apply Qlineedits is children (o

Tags: qt gdb makefile parametersIn Qt, to add the relevant compilation parameters in the makefile can be achieved by modifying them in the Xx.pro file:Implemented in Xx.pro by using the Qmake_cxxflags setting (for example, to add gdb debug parameters)Qmake_cxxflags + =-g (may appear in the Xx.pro file is black, others appear to have purple)After recompiling, you can use the GDB command to debug.This article

15 16 17 18 19 20 21st 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 Read the description from memoryProcess B-ReadIt is divided into the following steps: Bind the process to the shared memory segment created by process a Locks the shared memory segment, copies the data to the buffer, and then writes to the Qimage. Unlocks the shared memory segment, and then separates the process

this:Drag.mimedata: {"Color": Color, "width": width, "height": height};And we get the data passed by the dragged element in the ondropped signal processor of the Droparea object through the Dragevent getdataasstring, like this:parseint (drop.getdataasstring ("width")actually similar to Key-value.All right, that's it.Look back at my QT Quick Series articles: About Qt Quick QML Language Basics

I don't remember when to compile it. I pasted it to record it. I don't even remember the compilation command. configure -opensource -confirm-license -debug-and-release -fast -static -platform win32-msvc2010 -openssl -no-qt3support -webkit -script -scripttools -qt-zlib -qt-libpng -qt-libmng -qt-libtiff -

in view of many classmates to QT compiles myql always cannot succeed. There are a variety of problems, today we write this tutorial, hoping to help the students who need.First, the purpose and principle of the compilation need to be clarified.Purpose: The Qt 5.2 version number was used without MySQL driver. So it is necessary to compile MySQL database driver, onl