gui freeze when rendering preview QRPT

[Proton Phoenix]

Hi ~~ ^^
i have a small problem on QRPT
i am using it just testing o print reports for supermarket ..
so i have 4 columns and almost 510 rows in QTableView
the problem is when i try to preview it took almost 6 to 8 seconds to render the preview .. that's not a problem at all but it freezes the GUI of the all software on those seconds ..
i tried QThread but it didn't fix it

~~ just i want a solution of GUI Freeze during rendering the preview

    connect(ui->printbutton,SIGNAL(clicked()),this,SLOT(print()));

void test::print(){
     thread= new QThread();

      report=new QtRPT();
      report->setParent(thread);
      report->moveToThread(thread);
      thread->start();
       QString dirpath=QDir::currentPath().append("/release/report/productquantity.XML");
      report->loadReport(dirpath);

      QObject::connect(report, SIGNAL(setValue(const int, const QString, QVariant&, const int)),
                           this, SLOT(setValue(int, QString, QVariant&, int)));
      QObject::connect(report, SIGNAL(setDSInfo(DataSetInfo&)),
                        this, SLOT(setDSInfo(DataSetInfo&)));

      report->printExec(true,false);
}

[aliks-os]

hi many thanks for using QtRPT project. Yes the moving instance of QtRpt to the thread is a good solution.

  report=new QtRPT();
      report->moveToThread(thread);
      thread->start();

I think you dont need assign parent to Qtrpt.

[Proton Phoenix]

aliks-os hi bro , thanks for great support , i removed setparent of QtRpt but The same problem
during rendering ... Software GUI Freeze for 6 to 7 seconds ~!
is There Any way to fix that?
i am sure rendering would take time but at least program gui need stay responive to the user~!

[aliks-os]

do you have any warning in Qt Creator when execute print generation?

[Proton Phoenix]

QObject::moveToThread: Cannot move objects with a parent

this message shows up during rendering
by the way i removed setparent of qrpt instance

auto report=new QtRPT;
QtRpt with no parent

[aliks-os]

looks like the QtRPT is not moved to the QThread

[Proton Phoenix]

yes is there any solution!!? advice

[aliks-os]

yes, it is. I will try to make some small correction in the code. I hope in 1H will be ready

[Proton Phoenix]

aliks-os thank you so much bro , the best support ever i wish the happiest life for you bro thank you <3
if you fix it where i can find the new code or you will set a new version!

[aliks-os]

do you use DLL and build from source code?

[Proton Phoenix]

Yes both

[aliks-os]

update from git repo (sourceforge) the file qtrpt.h

[Proton Phoenix]

ok bro i understand it now
you helped me a lot
thank you for everything

[aliks-os]

And try run as below

     thread= new QThread(this);

      report=new QtRPT();
      report->moveToThread(thread);

       QString dirpath=QDir::currentPath().append("/release/report/productquantity.XML");
      report->loadReport(dirpath);

      QObject::connect(report, SIGNAL(setValue(const int, const QString, QVariant&, const int)),
                           this, SLOT(setValue(int, QString, QVariant&, int)));
      QObject::connect(report, SIGNAL(setDSInfo(DataSetInfo&)),
                        this, SLOT(setDSInfo(DataSetInfo&)));

QObject::connect(thread, &QThread::started, this, [=]()
    {
    QMetaObject::invokeMethod(report,
                              "printExec",
                              Qt::QueuedConnection,
                              Q_ARG(bool, true),
                              Q_ARG(bool, false)
                              );
    });

      thread->start();

[Proton Phoenix]

thread= new QThread();

   report=new QtRPT();
   report->moveToThread(thread);

QString dirpath=QDir::currentPath().append("/release/report/productquantity.XML");

// QMessageBox::information(this,"W",dirpath.append(""),QMessageBox::Ok);

report->loadReport(dirpath);

QObject::connect(report, SIGNAL(setValue(const int, const QString, QVariant&, const int)),
this, SLOT(setValue(int, QString, QVariant&, int)));
QObject::connect(report, SIGNAL(setDSInfo(DataSetInfo&)),
this, SLOT(setDSInfo(DataSetInfo&)));

QObject::connect(thread, &QThread::started, this, =
{
QMetaObject::invokeMethod(report,
"printExec",
Qt::QueuedConnection,
Q_ARG(bool, true),
Q_ARG(bool, false)
);
});

thread->start();
report->printExec(true,false);

   trying this

   retains those errors

QObject: Cannot create children for a parent that is in a different thread.
(Parent is QtRPT(0xb0b75c0), parent's thread is QThread(0xc3bf610), current thread is QThread(0x59fa440)
QObject: Cannot create children for a parent that is in a different thread.
(Parent is QtRPT(0xb0b75c0), parent's thread is QThread(0xc3bf610), current thread is QThread(0x59fa440)
QObject::installEventFilter(): Cannot filter events for objects in a different thread.
QPainter::begin(): Returned false
QObject::connect: Cannot queue arguments of type 'DataSetInfo&'
(Make sure 'DataSetInfo&' is registered using qRegisterMetaType().)
QPainter::resetMatrix: Painter not active
QPainter::save: Painter not active

---

QPainter::restore: Unbalanced save/restore
QPainter::resetMatrix: Painter not active
""
~~~

[aliks-os]

thread->start();
//report->printExec(true,false);    //<<<<<<<<<Remove this line

[Proton Phoenix]

without report->printExec .....

QMetaObject::invokeMethod: No such method QtRPT::printExec(bool,bool)

[aliks-os]

did you replace qtrpt.h by file from git repo?

[aliks-os]

    QMetaObject::invokeMethod(report,
                              "printExec",
                              Qt::QueuedConnection,
                              Q_ARG(bool, true),
                              Q_ARG(bool, false),
                               Q_ARG(QString, "")
                              );

please replace as

[Proton Phoenix]

now after building the latest version with replacing the new file and replacing QMetaObject ...

QObject: Cannot create children for a parent that is in a different thread.
(Parent is QtRPT(0xc3a3a90), parent's thread is QThread(0x80a5600), current thread is QThread(0x5a5a2e0)
QObject::connect: Cannot queue arguments of type 'DataSetInfo&'
(Make sure 'DataSetInfo&' is registered using qRegisterMetaType().)

---

starting evaluate
QObject::connect: Cannot queue arguments of type 'QVariant&'
(Make sure 'QVariant&' is registered using qRegisterMetaType().)

---

A White Screen and software freeze ...
using this code

thread= new QThread(this);

   report=new QtRPT();
   report->moveToThread(thread);

    QString dirpath=QDir::currentPath().append("/release/report/productquantity.XML";

   report->loadReport(dirpath);

   QObject::connect(report, SIGNAL(setValue(const int, const QString, QVariant&, const int)),
                        this, SLOT(setValue(int, QString, QVariant&, int)));
   QObject::connect(report, SIGNAL(setDSInfo(DataSetInfo&)),
                     this, SLOT(setDSInfo(DataSetInfo&)));

QObject::connect(thread, &QThread::started, this, [=]()
 {
 QMetaObject::invokeMethod(report,
                              "printExec",
                              Qt::QueuedConnection,
                              Q_ARG(bool, true),
                              Q_ARG(bool, false),
                               Q_ARG(QString, "")
                              );
 });
    thread->start();

if i put thread as parent of QtRPT it works and no white screen
but the gui freeze and this error show's up constantly

starting evaluate

---

Uncaught exception at line 1 : "SyntaxError: Unexpected token '" Uncaught exception at line 1 : "SyntaxError: Unexpected token'"
Uncaught exception at line 1 : "SyntaxError: Unexpected token '" Uncaught exception at line 1 : "SyntaxError: Unexpected token'"
Uncaught exception at line 1 : "SyntaxError: Unexpected token '" Uncaught exception at line 1 : "SyntaxError: Unexpected token'"
Uncaught exception at line 1 : "SyntaxError: Unexpected token '" Uncaught exception at line 1 : "SyntaxError: Unexpected token'"
Uncaught exception at line 1 : "SyntaxError: Unexpected token '" Uncaught exception at line 1 : "SyntaxError: Unexpected token'"
Uncaught exception at line 1 : "SyntaxError: Unexpected token '" Uncaught exception at line 1 : "SyntaxError: Unexpected token'"
Uncaught exception at line 1 : "SyntaxError: Unexpected token '" Uncaught exception at line 1 : "SyntaxError: Unexpected token'"
Uncaught exception at line 1 : "SyntaxError: Unexpected token '" Uncaught exception at line 1 : "SyntaxError: Unexpected token'"
Uncaught exception at line 1 : "SyntaxError: Unexpected token '" Uncaught exception at line 1 : "SyntaxError: Unexpected token'"
Uncaught exception at line 1 : "SyntaxError: Unexpected token '" Uncaught exception at line 1 : "SyntaxError: Unexpected token'"
Uncaught exception at line 1 : "SyntaxError: Unexpected token '" Uncaught exception at line 1 : "SyntaxError: Unexpected token'"
Uncaught exception at line 1 : "SyntaxError: Unexpected token '" Uncaught exception at line 1 : "SyntaxError: Unexpected token'"

[aliks-os]

I have tested on my side and I am affraid to directly use a QtRPT in a thread, I need to redo a lot in it.

You can create an intermediate class in which the QtRPT will be located and called. And put this intermediate class in the thread

[Proton Phoenix]

i understand bro , your project is the best of it's kind on qt frameowork
thank you for your great support
i will try to do what you told me