foundations of qt development

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Qt for Android development example tutorial

Qt for Android development example tutorial This article describes how to use Qt5.3.0 to develop Android applications. Due to a small amount of official information, we will record the problems encountered during the development process and solutions. The procedure is as follows: 1. Only qml MediaPlayer can be used for video playback on the Android platform. 2.

[Share]itop-4412 Development Board QT-holding HDMI display

This article goes from WebEx to:http://www.topeetboard.comConfigure the kernel firstRun the command "CP config_for_ubuntu_hdmi. config" in the kernel directory, such as:Then execute "make" to start compiling the kernel, such as:The build is completed and the image is generated:zimageModifying the Linux file systemEnter into our Linux file system, such as:Then use the command "VI bin/qt4 ", such as:Then add it at the beginning of the Qt4 file:Mv/dev/fb0/dev/fb0_bakLn-s/dev/fb6/dev/fb0As shown i

QT on Android Development

1. Install QT2. Installing the JDKConfigure the following system environment variables: Java_home D:\Java\jdk Path %java_home%\bin;%java_home%\jre\bin CLASSPATH .; %java_home%\lib;%java_home%\lib\tools.jar On the command line, enter the following command to see if the installation was successful: java-version Java Javac 3. Install the Android SDK If the package does not refresh, open Directory C:\WINDO

QT Mini game development: Minesweeper

Go ahead and write a little QT game ~PreviewStepsThe whole code structure, the game logic class and the game interface class separate, adopt the idea of MVC. 1 defining game data StructuresThe game map is actually a two-dimensional matrix consisting of a block of squares, where no block stores numbers, thunder, or tags, and also defines some of the game's running state enumerations.----------------Global definition Variable----------------the state of

QT Development preliminary, gradual, prerequest for blueprint reverse attack

1, use QT Object-oriented class inheritance to create the first window main part, using Setminimumsize (), setmaximumsize () to configure the main part window can be resize;Qwidget::setgeometry () window size on the screen display positionThe Qwidget::setgeometry () function sets the size and position of the window when it is first displayed on the screen and can be moved or resized after the window is displayed;Qwidget::setgeometry () Interpretation

QT Development Gadget GIF converter (use Qmovie to intercept each frame as qimage, then save as picture file with Qfile)

Recently, many kinds of GIF expressions on QQ. Every one of them is a classic. So I wanted to convert it into a static picture ... Never learned PS. So I wrote a few lines of code. Completed. The core code is as followsMainly with the help of the Qmovie class. File read Mode Select Qmovie::cacheall This allows you to cache all pictures. Then end the jumptoframe to toggle the picture. The loop is done.[CPP]View Plaincopy void Mainwindow::getstaticphoto () { if (M_gifpath = = "" | | M_save

Qt 5.3 under OpenCV 2.4.11 Development (13) Corrosion and expansion

Default corrosion and expansion operation:#include Function Description:1. The threshold function is used to process the grayscale image into two-valued image, the first parameter is the input grayscale image, the second parameter is the output two value image, the third parameter is the threshold value, the fourth parameter is the data that satisfies the threshold condition of the pixel, and the fifth parameter is the positive and negative switch. There is also a thresh_binary, the opposite eff

Qt 5.3 under OpenCV 2.4.11 Development (15) Filter function

has a good effect of reducing noise.3, Median filter: The operation speed is relatively slow, and the same filter core growth rate of the premise, the operating time growth rate than the Gaussian filter algorithm is much higher growth, but for salt and pepper noise has a good filtering effect.4, the bilateral band filter: the operation of the slowest, and in the same filter core growth rate of the premise, the operating time than median filter algorithm growth rate is also greater, but the doub

Practical note two in QT development--Chinese transcoding problem and string conversion problem:

One, Chinese garbled transcoding problem1, transcoding three words: Window under the default is GBK format, linux default is UTF-8, see the situation conversion UTF-8/GBKQTEXTCODEC::SETCODECFORTR (Qtextcodec::codecforname ("UTF-8"));Qtextcodec::setcodecforlocale (Qtextcodec::codecforname ("UTF-8"));Qtextcodec::setcodecforcstrings (Qtextcodec::codecforname ("UTF-8"));2, Chinese put in tr (""), function, automatically converted to the required formatTwo, the mutual conversion of std::string and qs

Notes for Qt remote machine development

Tags: OS SP problem BS work as nbsp project recordA strange problem in recent projects is that when the final m_lastpos is recorded as the middle position of the current widget, qcursor is set as the current middle position.At this time, when I started to move, I found that the offset has a very strange maximum value. Later I found that because my working environment is a remote machine environment, when I call the global qcursor of the system :: when setpos is used, the cursor is still in my or

Xun 4418 Development Board QT Transplant Mobile 4G Module Part II

The first part:Http://www.cnblogs.com/topeet/p/6509248.htmlPart II:5.ping Non-access domain name is generally not set to cause DNS. There is a file resolv.conf under etc . This file is used to put DNS . This is the domain name is not set to. However , it is mandatory to copy this file to 192.168.1.1 in Eth0 's run script . This results in even if the correct DNS is set up in the file here , it will be found that the file is already 192.168.1.1 after booting . This is due to the eth0, which is p

QT Multilevel Directory Development

When we write the QT development interface program, we often use the code of each module or the QML file to separate, so as not to qml too many files and look a bit messy Below, let's take a look at: We write each module separately in a. pri file , and then we include them in the. Pro file Include ($ $PWD/.. /.. /.. /BASE/BASE.PRI) Include ($ $PWD/.. /.. /CAPB.PRI) Two. pri files are two different modules

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