qt5 book

QT5 publish, but rely on dynamic link library (DLL), but, QT5 dynamic link library seems to have 2 sets, such as Qt5core (for Realese), qt5cored (for debug), everything at the end with D is the debug file needs of the link library, MO bo master WordyA about publishing1. First, we need to find our own directory to install QT2. Locate the above path Qt/5.4/mingw491_32/bin3. Find 9 required base DLLs in the pa

QT4 Upgrade QT5 attention issuesQt4 transition to QT5 the project was blocked from the beginning, documenting the following problems---> Compile encountered a similar error:Error:QCalendarWidget:No such file or directoryerror:QComboBox:No such file or directoryerror:QDateEdit:No such file or directoryThe solution is as follows:1. In the *.pro file, add:QT + = Widgets2. Modifications#include For#include --->

1. Generally agree to the encoding method, it will not produce garbled. Unification for Utf-8.2. QT5 uses Qstringliteral (""); This method handles the encoding of literal constants, cannot handle variables, and cannot handle arrays and containers.3. Qstring::fromlocal8bit ("column Body");4. Look at the online example, mostly QT4 in the method, not applicable and QT5 not a success.5. The best solution is to

In the project, we have the need to record the screen, there are several ways to record the screen, can be based on Windows API BitBlt, FFmpeg Avdevice, DirectX and QT, this article explains the QT5-based capture screen. The advantages of QT relative to other kinds of screen-catching are better cross-platform, simple interface, inferior to DirectX capture screen, but DirectX can only be windows. After testing DirectX capture screen speed is the fastes

Nvidia driver installation (after download Xx.run installation file)1. CTRL+ALT+F1//go to Virtual terminal2.sudo Service LIGHTDM stop//stop X window3.sudo Init 34. sudo./xx.run If Nouveaue is using,disable it. by [sudo update-initramfs-u]5. Sudo service LIGHTDM startsudo apt-get install cmake cmake-curses-gui //install cmake and GUIsudo apt-get search qt5 // search for qt5 package and install availablesdow

Recently in writing qglviewer, found a problem, this is not happening on the ubuntu14.04 problem,realloc Invalid pointerAfter a half-day of data Fan County is qt4 and qt5 conflict between, resulting qglviewer can not link to the correct QT version, also someone through uninstall QT5 solveBut it's not an effective solution.Finally put my solution:Add "/usr/lib/x86_64-linux-gnu/libqglviewer-qt4.so.2.6.3 \" to

Tags: Sub network source load span compile turn device HTTP requestAs you can see from the version evolution of Qt, the Qftp class in QT4 is no longer available in Qt5, although it is possible to compile qftp by itself in Qt5, but the QT5 provides QNetworkAccessManager better compatibility and extensibility in sending and requesting networks, including FTP reques

Too many pits.The old driver is driving.System environment: Win7 64-bit, Python3.5.2 qt5~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~1. Download the source codeHTTPS://GITHUB.COM/TZUTALIN/LABELIMG, after download, unzip.2, Installation Python3.5py3.5.23, Installation PyQt5After entering cmd, enter: Pip install PyQt5 csdn look up: Pyqt5-5.6-gpl-py3.5-qt5.6.0-x64-2.exe4. Installation of Pyqt5_toolsDitto, execute command: Pip install Pyqt5

This is equivalent to forcing the connection method to be specified. Test:emit sgn_test3(1.7,2.2); 1 Output:SSTest::slt_2(double v): 1.7 1 2.3. Signal overloading, slot overloadingWith the above experience, the face of overloading is not afraid of:C++14 style specify both the signal and slot parameter table connect (this,qoverload This,qoverload//static_cast style specify signal, slot parameter table connect (this,static_castvoid (sstest::*) (int) > ( SSTEST::SG

encoding all use Qstring::fromlocal8bit () interface.Cause: The QT4 version needs to be supported. The Qstringliteral () method is also desirable, but it only supports the QT5 version, which can be used if there is no version problem.(2), CPP and other file encoding all use Utf8-bom format.Cause 1:utf8-No BOM will fail to compile using the window compiler cl, unless you are compiling the development using QT's MinGW version of Windows.Cause 2: The fi

Excerpt from: http://www.cnblogs.com/aoldman/p/3968280.html QT5, the Qwidget series is stripped out of the Qtgui and becomes a separate qtwidget module. With the introduction of Qt Quick2, qtdeclarative also gradually and Qwidget series also divorced from the relationship. Final: GUI programming under QT5, there are two sets of different things Qtwidget (using a thing called Backingstore) QtQuick (using a

When cross-compiling, usually prepare mkspec, refer to: Http://wiki.qt.io/Building_Qt_for_Embedded_LinuxMkspec consists of two files: Qmake.conf-this is a list of qmake variable assignments this tells Qmake what flags to pass through to the compiler, whic h compiler to use etc. Qplatformdefs.h-this is a header file with various platform-specific #includes and #defines. Often This just refers to a existing Qplatformdefs.h file from another generic Mkspec. Reference http://doc.qt.io/qt-

all articles in this series can be viewed here http://blog.csdn.net/cloud_castle/article/category/2123873Answer the QT5 official demo set 32--QT Quick examples-threadingTo our second example of QT Quick examples, the main reason for choosing this demo is that when we use the QT development interface (especially the cross-platform interface), Local screen information and window calls are unavoidable issues.This example shows us how to get local screen

QT5 itself to the FTP and TFTP support is not very good, find a lot of places also did not find the easy way, but the use of open source curl to achieve. But how to use TFTP has not been found in the instructions. There's a bunch of examples under Curl's doc, but there's no TFTP, but the document says TFTP. The answer is that people feel that TFTP is too simple, are lazy to write a demo, ╮(╯▽╰)╭ deeply despised. Let me tell you how to use the TFTP fea

All articles in this series can be viewed here http://blog.csdn.net/cloud_castle/article/category/2123873Next QT5 official demo set 35--music PlayerToday also brings an interesting small example, as shown in the text that we enter will be displayed in the central window and float in a sine wave shape.This example involves the Qbasictimer class in the Qt timer family and the very useful qfontmetrics class.When we deploy the app on a mobile device, Qt a

SetFont (const Qfont )*/ -Quit->setfont (Qfont (" Times", -, Qfont::bold)); + A Connect (quit,signal (clicked ()), Qapp,slot (Quit () )); at - } - -mywidegt::~mywidegt () - { - in}Mywidegt.cpp2.2 Input control group (inputs widegets)The name of each control contained in the input control group (input widegets) is followed byComboBox: combo boxes　　　　　Font Combobox: Fonts combo boxes　　　　　Line edit: Row editor　　　　　Text edit: Textual editing　　　　　PlainText edit: Textual editing　　　　　SpinBox: Digi

QT5 provides two classes for serial port operations, namely:qserialport and qserialportinfo.The most basic operating example code is as follows:1 #ifndef Dialog_h2 #defineDialog_h3 4#include 5 6#include 7#include 8#include 9 Ten namespaceUi { One classDialog; A } - - classDialog: PublicQdialog the { - Q_object - - Public: + ExplicitDialog (Qwidget *parent =0); -~Dialog (); + A Qserialport M_serail; at - PrivateSlots: - voidMyrecvdata ();

I encountered a small problem when learning QT to view the example provided by QT creater. It is clearly included in the Code. However, during compilation, the system prompts that the definition of qlabel and other classes cannot be found, but this is an official document, it should not be provided without compilation, so I thought it was definitely a problem. I searched the internet and found it. In the final analysis, it was still a version problem, the provided documentation is estimated to b

Many of the problems I encountered when I first started learning QT. For example, "Fatal error c1083: Unable to open the file including:" qapplication ": no such file or directory". If you encounter such a problem, either Baidu or the elderly in the group are asked. In fact, in summary, there is no similar statement like "QT + = widgets" added to the Pro file. How can this problem be solved? The answer is. In the pure QT creator, add "QT + = widgets" or "greaterthan (qt_major_version, 4) directl

Recently, you need to register a global hot key for a project. You can find a third-party library libqxt on the Internet to provide a better cross-platform solution, that is, qxtglobalshortcut. However, during the compilation process, we found that the qiniacteventdispatcher: eventfilter used in this library is no longer in qt5.3.1, so I changed it myself. The changes are as follows: Add the following code before the qxtglobalshortcutprivate class, because the qiniactnativeeventfilter class need