diff --git a/app/demo/device_user.cpp b/app/demo/device_user.cpp
index 12ec6928..d4abfc21 100644
--- a/app/demo/device_user.cpp
+++ b/app/demo/device_user.cpp
@@ -1,4 +1,5 @@
 #include "device_user.h"
+#include <QMessageBox>
 
 #if defined(HG_CMP_MSC)
 
@@ -87,6 +88,28 @@ class DeviceUser* DeviceUserMgr::OpenDeviceUser()
     if (nullptr == source)
         return nullptr;
 
+    HGUInt devCount = 0;
+    HGSane_GetDeviceCount(source, &devCount);
+    if (0 == devCount)
+    {
+        HGSane_CloseSource(source);
+        return nullptr;
+    }
+    else if (1 == devCount)
+    {
+        HGChar errInfo[256];
+        HGSaneDevice dev = nullptr;
+        HGSane_OpenDevice(source, 0, &dev, errInfo, 256);
+        if (nullptr == dev)
+        {
+            HGSane_CloseSource(source);
+            QMessageBox::information(m_wnd, tr("tips"), tr(errInfo));
+            return nullptr;
+        }
+
+        return new DeviceUser(m_wnd, source, dev);
+    }
+
     HGSaneDevice dev = nullptr;
     HGSane_OpenSelectedDevice(source, m_wnd, &dev);
     if (nullptr == dev)
@@ -116,7 +139,7 @@ DeviceUser::~DeviceUser()
 QString DeviceUser::GetName()
 {
     HGChar devName[256];
-    HGSane_GetDeviceName(m_saneDev, devName, 256);
+    HGSane_GetSourceName(m_source, devName, 256);
     return QString(devName);
 }