Question is simple; I get an error "Unknown module QWebEngineView" when I write the line Qt += QWebEngineView in .pro file.
How to get rid of this ?
I have tried many solutions but still got the error when compiling. If you got a solution please explain it entirely step by step.
I run Qt 5.10.1 with Ming32 5.30.
Try to use msys2 project that contains mingw64 with patches for qt5.
Write in your .pro file
QT += webenginewidgets
Add
#include <QWebEngineView>
in file that will use QWebEngineView class
Related
I just create new Qt Widgets Application. I open the mainwindow.cpp and it's like mainwindow.cpp doesnt see the "mainwindow.h" while i was on editor. But compiler works fine. How do i fix this semantic issues?
I added 'QT += widgets' to .pro file. It doesnt work.
These are actually default files.
--mainwindow.h--
--mainwindow.cpp--
I fixed this bug by unchecking Help/Plugins/C++/ClangCodeModel and restart QtCreator.
I try to use libltdl in Qt on OSX. I downloaded the library with brew and i can find it in /usr/local/lib/libltdl.dylib .
I link it in Qt Creator using the assistant and those lines were added to my .pro
macx: LIBS += -lltdl
The problem is when i use :
#include <ltdl.h>
the app doesn't compile and the following error appears :
fatal error: 'ltdl.h' file not found
#include <ltdl.h>
Thanks for your help !
I have a problem with Qt 5.5 and QTreeView. qtreeview.h (Yes, it's from Qt folder) has compiler error:
fatal error: QTreeViewPrivate: No such file or directory.
My Qt5.5 library doesn't know about QTreeViewPrivate, but qtreeview.h needs it. Every simple code like this QTreeWidget *fileList = new QTreeWidget(); or else linked to QTreeView makes my complier angry! Maybe it's some bug? Where is QTreeViewPrivate ?
Check if you added the correct library to your project file:
QT += widgets
See documentation: http://doc.qt.io/qt-5/qtreeview.html
Check if you added the correct Qt folder path to your project.
In project properties, c/c++ general libraries.
Well, I found the solution. To use QTableWidget that no need QTableViewPrivate's header I edit qtableview.h in my Qt folder, I replased #include <QTreeViewPrivate> to class QTreeViewPrivate;. Now code works fine!
I want to use gstreamer library for video programming and I read that Qt5.5.0 provided support for gstreamer-1.0, which is the library I use. I downloaded firstly version 1.0.7, but I got the following error, so I downloaded the latest version 1.5.2, which I am trying to use now.
I managed to link the gstreamer library header files, so I didn't build it, but just include its path and access the header files and libs. Anyway, now I have an error of The program has unexpectedly finished. When I try to debug it, I get the following error in a pop-up:
During startup program excited with code 0xc0000135.
On General Messages:
:1:24: Reading only version 1.1 parts.
:10:5: Expected only Component and ModuleApi object definitions.
I read many questions related to this error, but none helped, I think is an error with the gstreamer library, but may be a compiler/debugger error too, as I read in some threads.
I checked my PATH variable, as I also can not run the program outside Qt (by trying to run the .exe in debug folder of the build) - the error : library Qt5Cored.dll missing - and I found this paths:
C:\Qt\Qt5.5.0_Android\5.5\mingw492_32\lib;
C:\Users\user\Documents\build-GStreamer-test5-Desktop_Qt_5_5_0_MinGW_32bit-Debug;
C:\Qt\Qt5.5.0_Android\5.5\mingw492_32\bin;
C:\Qt\Qt5.5.0_Android\Tools\mingw492_32\bin;
C:\Windows\system32; C:\Windows; C:\Windows\System32\Wbem; C:\Windows\System32\WindowsPowerShell\v1.0;
C:\Program Files\Skype\Phone\ (I dont know why is this included, but it was there when I checked )
I am relatively new to Qt, and never encountered this error before. If you need any code:
.pro:
QT += core gui
greaterThan(QT_MAJOR_VERSION, 4): QT += widgets
TARGET = GStreamer-test5
TEMPLATE = app
SOURCES += main.cpp
mainwindow.cpp
HEADERS += mainwindow.h
FORMS += mainwindow.ui
INCLUDEPATH += C:/gstreamer/1.0/x86/include/gstreamer-1.0
C:/gstreamer/1.0/x86/lib/gstreamer-1.0/include
C:/gstreamer/1.0/x86/include/glib-2.0
C:/gstreamer/1.0/x86/lib/glib-2.0/include
LIBS += -L C:/gstreamer/1.0/x86/lib/ -lgstreamer-1.0
and .main:
#include "mainwindow.h"
#include <QApplication>
#include <QDebug>
#include <stdio.h>
#include "gst/gst.h"
void *__gxx_personality_v0;
int main(int argc, char *argv[])
{
QApplication a(argc, argv);
MainWindow w;
w.show();
const gchar *nano_str;
guint major, minor, micro, nano;
gst_init (&argc, &argv);
gst_version (&major, &minor, µ, &nano);
if (nano == 1)
nano_str = "(CVS)";
else if (nano == 2)
nano_str = "(Prerelease)";
else
nano_str = "";
// printf ("This program is linked against GStreamer %d.%d.%d %s\n", major, minor, micro, nano_str);
qDebug() << "This program is linked against GStreamer %d.%d.%d %s\n", major, minor, micro, nano_str ;
return a.exec();
Firstly, I had the error :
undefined reference to `__gxx_personality_v0' , but fixed it by adding *void __gxx_personality_v0; , although I don't know what excatly it is.
Its been three days I struggle with this problem. Any help appreciated, or maybe if you can help me by some code on how to access the header files and libs, or how the configuration of the debugger options / PATH must be.
I am using Qt5.5.0 for Android, for Windows I use MinGW 4.9.2 32 bit compiler and GNU gdb 7.8 as debugger.
Thanks in advance!
I had similar problems in my project that was using both Qt and Gstreamer.
The сause of "undefined reference to `__gxx_personality_v0'" error is that Qt and GStreamer for windows from official sites were built using different compilers and their libstdc++ libraries are not compatible - they are using different exception handling methods.
In fact, GStreamer is pure C library. The only component of it that was written in C++ is taglib library. If you will build this lib from sources using your MinGW compiler, and then replace it in the GStreamer folder, the problem of incompatibility will be solved.
In more detail you can read here: https://github.com/knowthelist/knowthelist.
I managed to solve the above problem. I had to include in the .exe folder (the build-debug folder) all the dlls included, so I tried to run the .exe from there, not run it from Qt, and some errors with dlls missing gave me the names of the dlls. I found some in my library bin folder and some downloaded, and now everything seems fine :)
I am a bit stuck at the moment with a little sample project that I would like to run to test some cryptology that I want to use in a main project.
Basically I am using the latest Qt Creator and I have created a simple window dialog. Furthermore, I would like to test the PBKDF2 implementation through CkCrypt2
So what I have done is downloading the X64 version of the library and added it to my project folder. I then told my Qt project to use an external library, the final .pro file looks like this:
#-------------------------------------------------
#
# Project created by QtCreator 2013-06-09T18:09:44
#
#-------------------------------------------------
QT += core gui
greaterThan(QT_MAJOR_VERSION, 4): QT += widgets
TARGET = crypt2test
TEMPLATE = app
SOURCES += main.cpp\
m
ainwindow.cpp
HEADERS += mainwindow.h
FORMS += mainwindow.ui
win32:CONFIG(release, debug|release): LIBS += -L$$PWD/libs/ -lChilkatDbgDll_x64
else:win32:CONFIG(debug, debug|release): LIBS += -L$$PWD/libs/ -lChilkatDbgDll_x64d
else:unix: LIBS += -L$$PWD/libs/ -lChilkatDbgDll_x64
INCLUDEPATH += $$PWD/include
DEPENDPATH += $$PWD/include
I can successfully load the library but I cannot start the application.
My mainwindow.cpp looks like this:
#include "mainwindow.h"
#include "ui_mainwindow.h"
#include "CkCrypt2.h"
#include <QDebug>
MainWindow::MainWindow(QWidget *parent) :
QMainWindow(parent),
ui(new Ui::MainWindow)
{
ui->setupUi(this);
CkCrypt2 crypt;
bool success;
success = crypt.UnlockComponent("Just some random text ");
if ( !success )
{
qDebug() << "Not successfully unlocking the library";
}
}
MainWindow::~MainWindow()
{
delete ui;
}
The error message I get in the compiler is:
c:\qt\qt5.0.2\tools\qtcreator\bin\crypt2test\include\CkString.h:127: error: C2061: syntax error : identifier 'SYSTEMTIME'
c:\qt\qt5.0.2\tools\qtcreator\bin\crypt2test\include\CkString.h:129: error: C2061: syntax error : identifier 'SYSTEMTIME'
C:\Qt\Qt5.0.2\Tools\QtCreator\bin\crypt2test\include\CkCrypt2.h:429: error: C2061: syntax error : identifier 'SYSTEMTIME'
Looking into the files I see:
void appendDateRfc822(SYSTEMTIME &sysTime);
void appendDateRfc822Gmt(SYSTEMTIME &sysTime);
// GETSIGNATURESIGNINGTIME_BEGIN
bool GetSignatureSigningTime(int index, SYSTEMTIME &outSysTime);
// GETSIGNATURESIGNINGTIME_END
Okay, so it is complaining about the SYSTEMTIME construct. So I look up the error C2061
Basically it says:
The compiler found an identifier where it wasn't expected. Make sure
that identifier is declared before you use it.
Which makes sense, so I look up the SYSTEMTIME and try to do :
#include <windows.h>
But that leads to many more errors in the windows.h file itself.
I use the MS Visual C++ compiler in Qt. Even though I use qmake. I am very new to this and I do not understand it all yet. Furthermore, I have no idea how to fix this, because including the windows.h does not help.
What seems to be the problem here ? Is this an issue regarding my compiler or the constulation that I use a third party app which library is compiled with MS Visual C++ and I am now trying to use this on my Windows machine in Qt with a Windows Visual C++ compiler ?
For any help I am gratefully thankful!
EDIT1:
Actually, after a clean all and qmake and build project I have now different errors and none were found in the Windows.h as previously stated. Since there were so many I have made a screenshot: http://i.imgur.com/B8EoENB.png
EDIT2:
I have adjusted the library that I include. Before this I was using the multi-threaded library of CkCrypt in the Debug mode. I have now included the single realease library. Which is located in the same directory.
When including windows.h I got the errors that things were already defined. So I removed the line again. With this result: http://i.imgur.com/z415txR.png
This shows at the bottom that MSVCRT conflichts with other library. It mentions to use NODEFAULTLIB:library but I am not to sure how to do that. Will google and keep this up to date as I process.
Many years ago, Chilkat was originally developed for the Windows platform only, and used SYSTEMTIME for this reason. In the last 5 years (approx) Chilkat is cross-platform, and SYSTEMTIME no longer makes sense. To cope with the issue, there is a "SystemTime.h" header in the same directory as the CkCrypt2.h header file. You could include this to solve the problem. (However, if WIN32 is defined, you'll probably need to edit SystemTime.h to remove the #ifdef.)
In any case, the methods using SYSTEMTIME are going to be deprecated. For any method or property that uses SYSTEMTIME, there should be a newer alternative method/property that instead uses CkDateTime.
Finally, Chilkat will test with Qt so that for the next version, (hopefully) Qt out-of-the-box will compile without any pitfalls.