I solved my problem by using this line:
if(tmp=="PassDialog")
{
//QLabel* lbl = f->findChild<QLabel*>("lblRFID");
MyDialog *tempDialog = qobject_cast<MyDialog*>(f);
tempDialog->AcceptCard(output);
// emit recRFID(output);
return;
}
and clean that connection and comment the emit code. now its worked.
But I don't know why that code has error.
