Hello,
I have written two classes, one of which uses QTimer. My first class creates a QVector of my second class and in each instance of the second class, a QTimer is started in order to increment a counter periodically until it reaches a maximum. In other words, I have 5 timers running each in their respective class instance. I have no compile or execution errors but the timer's slot never seems to be called. I guess this means that the timeout signal of each qtimer is not called either... why? Are the QTimers out of scope before the timeout signal can be sent? I don't see why, as all instances of the classes remain active throughout... I have seen the comment on using QTimer in multiple threads here, except that I'm not using threads. Does anyone have any idea where I'm going wrong? Thanks very much in advance. My simplified code is as follows:
.h of my first class:
#include <QVector>
class MyFirstClass {
public:
void Initialize();
void Run();
QVector<QSharedPointer<MySecondClass> > mMySecondClass;
}
#include <QVector>
class MyFirstClass {
public:
void Initialize();
void Run();
QVector<QSharedPointer<MySecondClass> > mMySecondClass;
}
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.cpp of my first class:
void MyFirstClass::Initialize() {
mMySecondClass.resize(5); // Create 5 instances of second class
for (i = 0; i<mMySecondClass.size(); ++i) { // Initialize all 5 instances
mMySecondClass[i] = QSharedPointer<MySecondClass>(new MySecondClass);
mMySecondClass[i]->Initialize();
}
}
void MyFirstClass::Run() {
for (i = 0; i<mMySecondClass.size(); ++i) { // Call Run for all 5 instances of second class
mMySecondClass[i]->Run();
}
}
void MyFirstClass::Initialize() {
mMySecondClass.resize(5); // Create 5 instances of second class
for (i = 0; i<mMySecondClass.size(); ++i) { // Initialize all 5 instances
mMySecondClass[i] = QSharedPointer<MySecondClass>(new MySecondClass);
mMySecondClass[i]->Initialize();
}
}
void MyFirstClass::Run() {
for (i = 0; i<mMySecondClass.size(); ++i) { // Call Run for all 5 instances of second class
mMySecondClass[i]->Run();
}
}
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.h of my second class:
#include <QTimer>
class MySecondClass
: public QObject { Q_OBJECT
public:
void Initialize();
void Run();
protected slots:
void TimerSlot(); // slot connected to timeout of QTimer
protected:
int mCounter;
}
#include <QTimer>
class MySecondClass: public QObject {
Q_OBJECT
public:
void Initialize();
void Run();
protected slots:
void TimerSlot(); // slot connected to timeout of QTimer
protected:
QTimer *mMyTimer;
int mCounter;
}
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.cpp of my second class:
void MySecondClass::Initialize() {
}
void MySecondClass::Run() {
mCounter = 0; // initialize counter
connect(mMyTimer, SIGNAL(timeout()), this, SLOT(TimerSlot())); // connect timer signal to slot
mMyTimer->start(5); // start timer
}
void MySecondClass::TimerSlot() {
mCounter += 1; // increment counter
if (mCounter > 10) { // stop timer when counter reaches 10
mMyTimer->stop();
}
}
void MySecondClass::Initialize() {
mMyTimer= new QTimer();
}
void MySecondClass::Run() {
mCounter = 0; // initialize counter
connect(mMyTimer, SIGNAL(timeout()), this, SLOT(TimerSlot())); // connect timer signal to slot
mMyTimer->start(5); // start timer
}
void MySecondClass::TimerSlot() {
mCounter += 1; // increment counter
if (mCounter > 10) { // stop timer when counter reaches 10
mMyTimer->stop();
}
}
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Example implementation:
MyFirstClass foo;
foo.Initialize();
foo.Run();
MyFirstClass foo;
foo.Initialize();
foo.Run();
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How to use multiple instances of a class containing QTimer?
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