@VRonin said in QSortFilterProxyModel is filterning, but not sorting:

It is but something might go wrong if you reimplemented mapToSource()

How? If the output is as it should be... it's const method, it can't break things, right? Still, I've tested it and you were right: generic mapToSource() and mapFromSource() methods have exactly the same outputs as mine (I don't know why I thought I need to create them) and so I've deleted my methods and now everything is as it should be... thank you very much! Still, I'll check the Qt code to see what was the difference...

I use these only with little modification from qt4.8 up to qt5.8 ...... not the best, not well done, but it works ... maybe looking at it you will be able to bring you illumination ....
after these for sending image from qthread that grab the frame to gui windows (glwidget)I use connect/slot mechanism ... In m y gui there are 3 of these.

glwidg::glwidg(QWidget *parent) : QGLWidget(parent) { this->setAttribute(Qt::WA_DeleteOnClose); //// inizialize capture dimension windows QGLWidget(QGLFormat(QGL::DirectRendering)); setMaximumSize(480,360);//(352,288); initializeGL(); //resizeGL(280,320); paintGL(); } int glwidg::xAtPress = 0; int glwidg::yAtPress = 0; int glwidg::xsend = 0; int glwidg::ysend = 0; cv::Point glwidg::SendMousePoint(0,0); void glwidg::mouseMoveEvent(QMouseEvent * event) { xAtPress = event->x(); yAtPress = event->y(); xsend = round(xAtPress*1.422222222); ysend = round(yAtPress*1.2); /* if (xsend < 0) {xsend = 0;} if (xsend > 640) {xsend = 640;} if (ysend < 0) {ysend = 0;} if (ysend > 480) {ysend = 480;}*/ SendMousePoint = cv::Point(xsend, ysend); emit MousePoint(SendMousePoint); //qDebug() << "Mausepoint glwidg: " << SendMousePoint.x << ", " << SendMousePoint.y; } void glwidg::resizeGL(int w, int h) { makeCurrent(); glViewport(0, 0, w, h); glMatrixMode(GL_PROJECTION); glLoadIdentity(); gluOrtho2D(0, w, 0, h); // set origin to bottom left corner glMatrixMode(GL_MODELVIEW); glLoadIdentity(); } void glwidg::initializeGL() { makeCurrent(); glClearDepth(2000.0); glDisable(GL_TEXTURE_2D); glDisable(GL_DEPTH_TEST); glDisable(GL_COLOR_MATERIAL); glEnable(GL_BLEND); glEnable(GL_POLYGON_SMOOTH); glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA); glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); qglClearColor(Qt::white); } void glwidg::paintGL() { makeCurrent(); glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); qglColor(Qt::white); glutInitDisplayMode(GLUT_SINGLE | GLUT_RGBA); glMatrixMode(GL_MODELVIEW); /*+*/ glEnable(GL_DEPTH_TEST); if (cambio1 == 0) { qform1.load("/home/s/RIS/control2_106.png"); qq1frame = qform1.scaled(this->size(), Qt::IgnoreAspectRatio, Qt::SmoothTransformation); } else { qq1frame = qform1.scaled(this->size(), Qt::IgnoreAspectRatio, Qt::SmoothTransformation); } qqframe = qq1frame.mirrored(false, true); if(!qqframe.isNull()) { qqframe = qqframe.scaled(this->size(), Qt::IgnoreAspectRatio, Qt::SmoothTransformation); // glDrawPixels(qqframe.width(), qqframe.height(), GL_RGBA, GL_UNSIGNED_BYTE, qqframe.bits()); // or do 2D texture mapping glMatrixMode(GL_MODELVIEW); /**/ glEnable(GL_DEPTH_TEST); glMatrixMode(GL_PROJECTION); glLoadIdentity(); gluOrtho2D(0,qqframe.width(),qqframe.height(),0); glMatrixMode(GL_MODELVIEW); //glDisable(GL_DEPTH_TEST); glLoadIdentity(); glEnable(GL_TEXTURE_2D); glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST); glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST); glTexImage2D( GL_TEXTURE_2D, 0, 4, qqframe.width(), qqframe.height(), 0, GL_BGRA, GL_UNSIGNED_BYTE, qqframe.bits() ); glBegin(GL_QUADS); glTexCoord2f(0,0); glVertex2f(0,qqframe.height()); glTexCoord2f(0,1); glVertex2f(0,0); glTexCoord2f(1,1); glVertex2f(qqframe.width(),0); glTexCoord2f(1,0); glVertex2f(qqframe.width(),qqframe.height()); glEnd(); glDisable(GL_TEXTURE_2D); // .... end // qDebug() << ("ho disegnato??"); glDisable(GL_DEPTH_TEST); glFlush(); } if(qqframe.isNull()) { glClear(GL_COLOR_BUFFER_BIT); qglColor(Qt::white); } } void glwidg::donextcam() { makeCurrent(); } void glwidg::imma_orig_r1(QImage qi1) { cambio1 = 1; qform1 = qi1; glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); updateGL(); } void glwidg::stopcam1(bool st1) { if (st1) { cambio1 = 0; glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); updateGL(); } else { cambio1 = 1; } }

regards
giorgio

@jsulm this solution helped me. Thank you. Now I can continue working on my project.
And one more thing how I can send a response from the server?

Hi,

I don't remember whether the Z index of a QGraphicsProxyWidgetItem is fixed but it could offer a way to have everything in a QGraphicsView and manage everything from there.

Hope it helps

@Shidharth http://doc.qt.io/qt-5/linux-building.html

Then you'll have to compile the module yourself to check what is done differently.

Hi,

D-Bus is available on all three major desktops except it's not installed by default in Linux nor Windows.

What kind of process do you have in mind ?

QLocalSocket/Server is the combo that comes to mind.

@Obi-Wan said in Using QTcpSocket without event loop and without waitForReadyRead():

waitForReadyRead() which so happens to have a minimum wait time of 1 msec.

I'm not sure this is the case. the argument of waitForReadyRead is the maximum wait time, if the data is received faster it returns faster

@Obi-Wan said in Using QTcpSocket without event loop and without waitForReadyRead():

If I want to have a shorter wait time, I would need to create my own TCP socket class.

Not really, see https://forum.qt.io/topic/78715/why-my-timer-is-not-emit-timeout-signal/7 but instead of connecting the timeout signal of a QTimer you connect a readyRead signal from a socket

You can find more information in the platform notes from the QtWebEngine module.

In addition to previous posts, you are getting these chats on screen. Do u see a issue with string when manipulate or compare etc ? Can you give code snippet to show string is actually not the intended one ? Again don't get misled by debug print.

@kfrosty Thank you! Did work for me too! :)

The easiest way is to search on the Woboq Code Browser: https://code.woboq.org/qt5/qtbase/src/corelib/io/qiodevice.cpp.html#_ZN9QIODevice7readAllEv This is an interactive browser, which lets you click on a variable/function/constant name and jump to its definition.

Hi,

No, Qt Designer goal is to help you build quickly an interface. What you are asking for you might provide yourself using a custom designer plugin.

@ranshalit
The QLabel support setting the image directly.
Even its called setPixmap it does take any image supported by Qt.
You can even browse the resource and browse to it , directly in Designer.

If someone encounters the same problem, then here is the solution:
I was calling this function in a thread and inside that thread I called the new operator a couple of times, which caused the segmentation fault when trying to write to UDP socket, after I remove most of the new operator the problem has been solved.

I was having this same problem, turns out I was restarting too soon. The file transfer was so slow that took over a minute to transfer a 2Mb file.

I still don't have a good solution, I am using system("cp file1 file2") for Linux as a workaround, but don't have any suggestions for a portable solution.

I have reported this issue on the Qt bug tracker.
If someone is interested: https://bugreports.qt.io/browse/QTBUG-60738

Can I ask why you care? As you mention, the actual number being stored "under the hood" is not the rounded version. I know that JSON files are typically human-readable, but they are really designed for program-to-program communications.

@mrjj I never knew that... The hover workaround actually fixed my issue I mean it's not the best way to do it but it could be worse. For now I'll mark this as solved. Thanks again!