Test cardReaders != null before cardReadrs use.

2019-08-05 12:06:37 +02:00
parent bb1efb122e
commit 59f1de4370
3 changed files with 24 additions and 18 deletions
@@ -22,7 +22,6 @@ namespace Users.Forms

        /// Smart card support, card S/N is used as user.Tag
        GemCard.CardNative card;
-        string[] cardReaders;
        string smartCardReader;


@@ -62,13 +61,16 @@ namespace Users.Forms
                card = new CardNative();

                /// Find NFC smart card reader
-                cardReaders = card.ListReaders();
-                foreach (var crd in cardReaders)
+                string[] cardReaders = card.ListReaders();
+                if (cardReaders != null)
                {
-                    if (crd.Contains("NFC"))
+                    foreach (var crd in cardReaders)
                    {
-                        smartCardReader = crd;      /// NFC smart card reader detected
-                        break;
+                        if (crd.Contains("NFC"))
+                        {
+                            smartCardReader = crd;      /// NFC smart card reader detected
+                            break;
+                        }
                    }
                }