初步多线程

qr.cpp

@@ -0,0 +1,14 @@
+#include "qr.h"
+#include "ui_qr.h"
+
+QR::QR(QWidget *parent) :
+    QDialog(parent),
+    ui(new Ui::QR)
+{
+    ui->setupUi(this);
+}
+
+QR::~QR()
+{
+    delete ui;
+}