Wrong thread with placeholder %{qthreadptr} in own message pattern

[beecksche]

Hi,
i set an own message pattern with

QString pattern = "%{message}. Thread from pattern: %{qthreadptr}"
qSetMessagePattern(pattern)

I also used the placeholder %{qthreadptr}. But the thread doesn't change.

For example:

Slot in Thread 1:

void slotInThread1() 
{
   qDebug() << "Thread in slot1: " << QThread::currentThread();
   // Thread in slot1: QThread(0xd79e70). Thread from pattern: 0xd79e70 
}

Slot in Thread 2:

void slotInThread2() 
{
   qDebug() << "Thread in slot2: " << QThread::currentThread();
   // Thread in slot2: QThread(0x433f788). Thread from pattern: 0xd79e70 
}

Can some explain this behavior?

Thanks

[SGaist]

Hi,

How did you connect these slots ? To what are they connected ?

[beecksche]

@SGaist
Hi, now i have tested it on my Mac without the problems.

#include <QCoreApplication>
#include <QThread>
#include <QDebug>
#include <QTimer>
#include <QString>

class Worker : public QObject
{
    Q_OBJECT
public slots:
    void doWork(QString param) {
        qDebug() << param << "thread: " << QThread::currentThread();
    }
};

#include "main.moc"

int main(int argc, char *argv[])
{
    QCoreApplication a(argc, argv);

    QString pattern = "%{message}. Thread from pattern: %{qthreadptr}";
    qSetMessagePattern(pattern);

    QThread thread1;
    QThread thread2;

    Worker worker1;
    worker1.moveToThread(&thread1);
    thread1.start();

    Worker worker2;
    worker2.moveToThread(&thread2);
    thread2.start();

    qDebug() << "Thread in main: " << QThread::currentThread();

    QTimer timer;

    QObject::connect(&timer, &QTimer::timeout, [&worker1, &worker2]()
    {
        QMetaObject::invokeMethod(&worker1, "doWork", Q_ARG(QString, "worker1"));
        QMetaObject::invokeMethod(&worker2, "doWork", Q_ARG(QString, "worker2"));
    });

    timer.start(2000);

    return a.exec();
}

Output:

Thread in main:  QThread(0x100702b10). Thread from pattern: 0x100702b10
"worker1" thread:  QThread(0x7fff5fbffad8). Thread from pattern: 0x7fff5fbffad8
"worker2" thread:  QThread(0x7fff5fbffac8). Thread from pattern: 0x7fff5fbffac8

So i think i have to search the problem in my code.