multithreading - Qt signal and slot issue -
i have issue signals , slots, want use backgroundworker thread. suppose send signal few double values should updated in main gui. code compiles , thread starts gui not updating values.
first gui slot:
void mainwindow::slot_set_values(double ptm_temp, double ptm_hv, double heat_temp, double nomtemp, double current, double voltage) { ui->pmtvaluelabel->settext(qstring::number(ptm_temp)); ui->hvvaluelabel->settext(qstring::number(ptm_hv)); ui->heatvaluelabel->settext(qstring::number(heat_temp)); ui->nomvaluelabel->settext(qstring::number(nomtemp)); ui->currenvaluelabel->settext(qstring::number(current)); ui->vvaluelabel->settext(qstring::number(voltage)); } the worker code:
void dworker::run() { qsrand(qdatetime::currentdatetime().totime_t()); mdata.set_pmt_temp(qrand()%100); mdata.set_pmt_hv(qrand()%100); mdata.set_heat_opt_temp(qrand()%100); mdata.set_heat_nominal_temp(qrand()%100); (int = 0; i<100; i++) { double pmt_tmp = mdata.get_pmt_temp(); double hv = mdata.get_pmt_hv(); double heat_temp = mdata.get_heat_opt_temp(); double heat_nom = mdata.get_heat_nominal_temp(); emit set_values(pmt_tmp,hv,heat_temp,heat_nom,0,0); emit set_pmt(); qthread::msleep(1000); qdebug() << "test vom thread " << i; } } and connect statements:
connect(workerthread,signal(set_values(double,double,double,double,double,double)), this,slot(slot_set_values(double,double,double,double,double,double))); connect(workerthread,signal(set_pmt()),this,slot(slot_set_pmt()));
if object sends signal , receiver object in different threads, should connect qt::queuedconnection (docs here)
so, change connects this:
connect(workerthread,signal(set_values(double,double,double,double,double,double)), this,slot(slot_set_values(double,double,double,double,double,double)),qt::queuedconnection); connect(workerthread,signal(set_pmt()),this,slot(slot_set_pmt()),qt::queuedconnection); additionally, can try check via qdebug, receiving in slot:
qdebug()<<"my slot called,"<<ptm_temp<<" "<<ptm_hv<<" "<<heat_temp<<" "<<nomtemp<<" "<<current<<" "<<voltage; also, imperative have signal-slots, in header of derived class q_object macro
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