调整sane槽函数连接方式

app/scanner/mainwindow.cpp

@@ -213,8 +213,8 @@ MainWindow::MainWindow(QWidget *parent)
     connect(this, SIGNAL(new_image(void *)), this, SLOT(on_new_image(void *)), Qt::QueuedConnection);
     connect(this, SIGNAL(scan_working()), this, SLOT(on_scan_working()), Qt::QueuedConnection);
     connect(this, SIGNAL(scan_finish()), this, SLOT(on_scan_finish()), Qt::QueuedConnection);
-    connect(m_dialog_log, SIGNAL(continuScan(void)), this, SLOT(on_act_acquire_triggered(void)));
-    connect(m_dialog_log, SIGNAL(invoke_stop(void)), this, SLOT(on_act_acquireStop_triggered(void)));
+    connect(m_dialog_log, SIGNAL(continuScan(void)), this, SLOT(on_act_acquire_triggered(void)), Qt::QueuedConnection);
+    connect(m_dialog_log, SIGNAL(invoke_stop(void)), this, SLOT(on_act_acquireStop_triggered(void)), Qt::QueuedConnection);
 
     m_saneNoDevAction = new QAction(tr("nodevice"), this);
     m_saneNoDevAction->setEnabled(false);