Get serial number of bluetooth USB dongle on Windows

Now, the serial ports which are created by the bluetooth
connection takes the serial numbers of the own USB bluetooth
dongles. We enumerate all parent devices of a driver stack
until their end has been reached, or the serial number
has been found.

Change-Id: I63820f34fd4c47992c3c5ef3c7ce63eca4ea0cf8
Reviewed-by: Sergey Belyashov <Sergey.Belyashov@gmail.com>
Reviewed-by: Denis Shienkov <denis.shienkov@gmail.com>

1 files changed, 13 insertions, 7 deletions

diff --git a/src/serialport/qserialportinfo_win.cpp b/src/serialport/qserialportinfo_win.cpp
index 140f191..451efef 100644
--- a/src/serialport/qserialportinfo_win.cpp
+++ b/src/serialport/qserialportinfo_win.cpp
@@ -264,16 +264,22 @@ static QString parseDeviceSerialNumber(const QString &instanceIdentifier)
     return instanceIdentifier.mid(firstbound + 1, lastbound - firstbound - 1);
 }
 
-static QString deviceSerialNumber(const QString &instanceIdentifier,
+static QString deviceSerialNumber(QString instanceIdentifier,
                                   DEVINST deviceInstanceNumber)
 {
-    QString result = parseDeviceSerialNumber(instanceIdentifier);
-    if (result.isEmpty()) {
-        const DEVINST parentNumber = parentDeviceInstanceNumber(deviceInstanceNumber);
-        const QString parentInstanceIdentifier = deviceInstanceIdentifier(parentNumber);
-        result = parseDeviceSerialNumber(parentInstanceIdentifier);
+    forever {
+        const QString result = parseDeviceSerialNumber(instanceIdentifier);
+        if (!result.isEmpty())
+            return result;
+        deviceInstanceNumber = parentDeviceInstanceNumber(deviceInstanceNumber);
+        if (deviceInstanceNumber == 0)
+            break;
+        instanceIdentifier = deviceInstanceIdentifier(deviceInstanceNumber);
+        if (instanceIdentifier.isEmpty())
+            break;
     }
-    return result;
+
+    return QString();
 }
 
 QList<QSerialPortInfo> QSerialPortInfo::availablePorts()