.

CamTool/MainWindow.xaml.cs

@@ -740,10 +740,14 @@ namespace CamTool
 
         private void GetAllCard(object source, System.Timers.ElapsedEventArgs e)
         {
+            MessageBox.Show("OK!");
             int m_userId = 01;
             if (acsDevices.Count > 0)
             {
                 m_userId = acsDevices[0].userId;
+            } else
+            {
+                return;
             }
             if (-1 != m_lGetCardCfgHandle)
             {