BluetoothSelectDevices strange behavior on Windows 7 and 8

Question

Hi,
I have strange problem with BluetoothSelectDevices function from Windows Bluetooth API. I am developing an application containing mixed managed and unmanaged C++ code. One of its
required functions is to open a bluetooth devices selection dialog in order to give possibility to a user select previously remembered device or to pair and select a new device. First my problem appears when I call BluetoothSelectDevices with fAddNewDeviceWizard
field of BLUETOOTH_SELECT_DEVICE_PARAMS set to FALSE. In this case I wand a user simply will select his device from a list without possibility to add and pair a new device. This is my function:
static uint64 dialappBluetoothSelectDevice (HWND hwnd)
BLUETOOTH_SELECT_DEVICE_PARAMS btsdp = { sizeof(btsdp) };
btsdp.cNumOfClasses = 0; // search for all devices
btsdp.prgClassOfDevices = 0;
btsdp.pszInfo = L"Select Device..";
btsdp.hwndParent = hwnd;
btsdp.fForceAuthentication = FALSE;
btsdp.fShowAuthenticated = TRUE;
btsdp.fShowRemembered = TRUE;
btsdp.fShowUnknown = TRUE;
btsdp.fAddNewDeviceWizard = FALSE;
btsdp.fSkipServicesPage = TRUE;
btsdp.pfnDeviceCallback = 0; // no callback
btsdp.pvParam = 0;
btsdp.cNumDevices = 0; // no limit
btsdp.pDevices = 0;
if (BluetoothSelectDevices(&btsdp))
LogMsg ("BluetoothSelectDevices returned TRUE");
uint64 addr;
BLUETOOTH_DEVICE_INFO * pbtdi = btsdp.pDevices;
for (unsigned cDevice = 0; cDevice < btsdp.cNumDevices; cDevice ++)
if (pbtdi->fRemembered) {
addr = pbtdi->Address.ullLong;
break;
pbtdi = (BLUETOOTH_DEVICE_INFO*) ((BYTE*)pbtdi + pbtdi->dwSize);
BluetoothSelectDevicesFree(&btsdp);
return addr;
LogMsg ("BluetoothSelectDevices returned FALSE, GetLastError = %d", GetLastError());
return 0;
So, after calling this function the “Select Bluetooth Device” window is opened, but it is absolutely clean: there is only my text "Select
Device.." shown on the gray background and “Search Again” button at left-bottom window’s corner.  I have not overcome this problem for now.
The next problem appears on Windows 8 systems only when I set fAddNewDeviceWizard = TRUE. In this case the dialog is really shown (white background) and a user can select and pair a new
device. But when he completes device pairing, the function returns FALSE! Why? (On Windows 7 it works correctly). The GetLastError returns ERROR_CANCELLED (1223).
This problem is my real showstopper. What am I doing not correctly?
Thanks in advance.
Sergey

Answer 1

Hi RedSoftk,
Welcome back!
Problem1: I wonder if you really get one or more selected device.
Problem2:  Maybe you could test if the Bluetooth is still connected after your app gives you a FALSE. if the FALSE is given you when you press the complete button, so it is possible that the Bluetooth has failed to paired and added to PC.
Regards!
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