打开sane设备失败，弹出日志框

app/scanner/mainwindow.cpp

@@ -731,7 +731,10 @@ void MainWindow::on_sane_dev_remove(QString devName)
 void MainWindow::on_sane_dev_error(QString errorInfo)
 {
     //Error codes operate in slot function: on_scan_finish(QString finishInfo, int err).
-    (void)errorInfo;
+
+    m_wndStatusBar->setDeviceStatusInfo(errorInfo, true);
+    m_dialogLog->addLog(errorInfo, true);
+    HGBase_WriteInfo(HGBASE_INFOTYPE_ERROR, "%s", getStdString(errorInfo).c_str());
 }
 
 void MainWindow::on_new_image(void *img)
@@ -2447,7 +2450,8 @@ void MainWindow::on_scanOptions_changed(const QString &device, const QString &op
             schm = &(*it);
         if(cur_dev_.name() != device.toStdString())
         {
-            open_scanner(device, schm);
+            if(!open_scanner(device, schm))
+                m_dialogLog->show();
             return;
         }