[CLOSED] catch signals from a static library

XGuy

i have a static library called "Test" in which below function exists:

@
Test.h
#include <QtCore>
#include <QObject>

class Test:public QObject
{
Q_OBJECT

public:
Test(QObject *parent=0) : QObject(parent) { }
void getMessage(QString &strMessage);

signals:
void finished(int);
};

Test.cpp
void Test::getMessage(QString &strMessage)
{
strMessage = "Hello world!";
// emit finished(0); if i uncomment this line i get segFualt in caller thread
}

my application main func:
int main(int argc, char *argv[])
{
QString parameter;
DWORD dw1;
HANDLE hdl;
Test obj;
// ok is true after below code
bool ok = QObject::connect(&obj, SIGNAL(finished(int)), this, SLOT(mySlot(int)));

hdl = CreateThread(NULL, 0, (LPTHREAD_START_ROUTINE) &Test::getMessage, &parameter, 0, &dw1);
if(hdl == NULL)
{
    qDebug() << "failed to create thread.";
}
// if i uncomment line "emit finished(0);" i get sefFault here and if i don't app works perfectly
WaitForSingleObject(hdl,INFINITE);
if(parameter.isEmpty())
{
    qDebug() << "Parameter failed.";
}

return a.exec(&#41;;

}
@
i run a function from lib in another thread i want that function to emit a signal at the end and catch that signal in my app.

JKSH

[quote]
@
int main(int argc, char *argv[])
{
...
bool ok = QObject::connect(&obj, SIGNAL(finished(int)), this, SLOT(mySlot(int)));
}
@
[/quote]main() doesn't have a this pointer. Where is this connection actually done?

Also, what do you want to do with your thread? If you need threads, I recommend using one of Qt's cross-platform thread solutions: http://doc-snapshot.qt-project.org/qt5-stable/threads-technologies.html

XGuy

[quote author="JKSH" date="1383120515"][quote]
@
int main(int argc, char *argv[])
{
...
bool ok = QObject::connect(&obj, SIGNAL(finished(int)), this, SLOT(mySlot(int)));
}
@
[/quote]main() doesn't have a this pointer. Where is this connection actually done?

Also, what do you want to do with your thread? If you need threads, I recommend using one of Qt's cross-platform thread solutions: http://doc-snapshot.qt-project.org/qt5-stable/threads-technologies.html[/quote]

yes u are right actually the code inside main is in another function it was a copy and paste mistake!
at first i was using QThread but it seems Qthread has some problem on machines with 1core!! i tested this on a VM.

JKSH

[quote author="XGuy" date="1383123159"]yes u are right actually the code inside main is in another function it was a copy and paste mistake![/quote]Can you share your actual code?

[quote]at first i was using QThread but it seems Qthread has some problem on machines with 1core!! i tested this on a VM.[/quote]What kind of problem?

XGuy

[quote author="JKSH" date="1383128954"][quote author="XGuy" date="1383123159"}yes u are right actually the code inside main is in another function it was a copy and paste mistake![/quote]Can you share your actual code?

[quoteat first i was using QThread but it seems Qthread has some problem on machines with 1core!! i tested this on a VM.[/quote]What kind of problem?

[/quote]

just create a program in which some threads are created and then run it on a machine which has only one core.

JKSH

You said it "has some problem". Can you give more details? Threads work on single-core computers too.

Can you post the correct code for your original post?

XGuy

[quote author="JKSH" date="1383197446"]# You said it "has some problem". Can you give more details? Threads work on single-core computers too.

Can you post the correct code for your original post?[/quote]

in my case when i run multiple threads on a machine with one core the threads don't run simultaneously, it seems QThread runs each thread in a separate core.
and unfortunately i have changed my source code so the implementation with QThread is not available anymore :-(

XGuy

This used to be my approach for using QThread!

@
// objConnLable is a class obj
objConnLable.moveToThread(&thrConnLabel);
QObject::connect(&thrConnLabel, SIGNAL(started()), &objConnLable, SLOT(getTokenConnLabel()));
QObject::connect(&objConnLable, SIGNAL(connLabelReady(QString)), this, SLOT(updateConnList(QString)));
QObject::connect(&objConnLable, SIGNAL(connLabelFinished(int)), this, SLOT(getConnLabelFinished(int)));
thrConnLabel.start();
@

XGuy

Can you post the correct code for your original post?[/quote]

[quote author="JKSH" date="1383197446"]# You said it "has some problem". Can you give more details? Threads work on single-core computers too.

Can you post the correct code for your original post?[/quote]

here is a sample app that shows this.
i have two threads in which they start simultaneously and they have to update the UI.

@
MainWindow::MainWindow(QWidget *parent) :
QMainWindow(parent),
ui(new Ui::MainWindow)
{
ui->setupUi(this);

model1 = new QStandardItemModel();
model2 = new QStandardItemModel();

QObject::connect(this, SIGNAL(model1Ready(QStandardItemModel*)), this, SLOT(setdatatoview1(QStandardItemModel*)));
QObject::connect(this, SIGNAL(model2Ready(QStandardItemModel*)), this, SLOT(setdatatoview2(QStandardItemModel*)));

}

MainWindow::~MainWindow()
{
delete ui;
}

void MainWindow::on_btnstart_clicked()
{
QObject::connect(&threadtest1, SIGNAL(started()), this, SLOT(fillModel1()));
QObject::connect(&threadtest2, SIGNAL(started()), this, SLOT(fillModel2()));
threadtest1.start();
threadtest2.start();
threadtest1.wait(1);
threadtest2.wait(1);
}

void MainWindow::setdatatoview1(QStandardItemModel *model)
{
ui->lv1->setModel(model);
}

void MainWindow::setdatatoview2(QStandardItemModel *model)
{
ui->lv2->setModel(model);
}

void MainWindow::fillModel1()
{
for(int i = 0; i < 10000; i++)
{
QStandardItem *item = new QStandardItem(QString("Item%1").arg(i));
model1->appendRow(item);
emit model1Ready(model1);
}
}

void MainWindow::fillModel2()
{
for(int i = 0; i < 10000; i++)
{
QStandardItem *item = new QStandardItem(QString("Item%1").arg(i));
model2->appendRow(item);
emit model2Ready(model2);
}
}
@
but if u run this, one of the QTableWidgets waits for the other thread to get finished then starts to fill