Windows 8.1 Bluetooth LE can't get device interface - c++

Question

I am trying to retrieve the name and handle of all paired bluetooth devices on a windows 8.1 machine.
I can get the name, but SetupDiEnumDeviceInterfaces always returns false. I read somewhere that I need to include DIGCF_DEVICEINTERFACE in the SetupDIGetClassDevs function, but it still doesn't work.
Here is my code:
HDEVINFO hDevInfo;
SP_DEVINFO_DATA DeviceInfoData;
DWORD i;
// Create a HDEVINFO with all present devices.
hDevInfo = SetupDiGetClassDevs(
&GUID_DEVCLASS_BLUETOOTH,
0, 0, DIGCF_PRESENT);
if (hDevInfo == INVALID_HANDLE_VALUE)
{
// Insert error handling here.
return;//1;
}
// Enumerate through all devices in Set.
DeviceInfoData.cbSize = sizeof(SP_DEVINFO_DATA);
for (i = 0; SetupDiEnumDeviceInfo(hDevInfo, i,
&DeviceInfoData); i++)
{
DWORD DataT;
LPTSTR buffer = NULL;
DWORD buffersize = 0;
while (!SetupDiGetDeviceRegistryProperty(
hDevInfo,
&DeviceInfoData,
SPDRP_FRIENDLYNAME,
&DataT,
(PBYTE)buffer,
buffersize,
&buffersize))
{
if (GetLastError() == ERROR_INSUFFICIENT_BUFFER){
// Change the buffer size.
if (buffer) delete(buffer);
// Double the size to avoid problems on
// W2k MBCS systems per KB 888609.
buffer = new wchar_t[buffersize * 2];
}
else{
// Insert error handling here.
break;
}
}
HWND deviceList = GetDlgItem(GetActiveWindow(), LIST_BOX);
if (deviceList && buffersize > 0)
{
SendMessage(deviceList, LB_ADDSTRING, 0, (LPARAM)buffer);
}
if (buffer) delete(buffer);
// WORKS UNTIL HERE BUT ENUMERATING THROUGH INTERFACES ALWAYS RETURNS FALSE
SP_DEVICE_INTERFACE_DATA devIntData;
HDEVINFO hDevInfo2 = SetupDiGetClassDevs(
&GUID_DEVCLASS_BLUETOOTH,
0, 0, DIGCF_PRESENT | DIGCF_DEVICEINTERFACE);
if (SetupDiEnumDeviceInterfaces(hDevInfo2,
&DeviceInfoData,
&GUID_BLUETOOTHLE_DEVICE_INTERFACE,
i,
&devIntData))
{
DWORD reqSize;
SP_DEVINFO_DATA buffer;
while (SetupDiGetDeviceInterfaceDetail(hDevInfo2,
&devIntData,
NULL,
NULL,
&reqSize,
&buffer))
{
OutputDebugString(L"DeviceINTERFACE");
}
}
}
I have tried putting the device enumeration outside of the name enumeration loop, but it still returns false also I would like the handle and the name to be associated so I would like them to be found in the same context.
If anyone has any sample code on a full bluetooth LE workflow in windows 8.1 (find name, find handles, find services, find characteristics, write to characteristics) and could share that with me I would greatly appreciate it. Thanks.

Answer 1

Figured it out, wasn't allocating memory for my buffers properly.
EDIT: Adding code
HDEVINFO hDevInfo;
SP_DEVINFO_DATA DeviceInfoData;
DWORD i;
// Create a HDEVINFO with all present devices.
hDevInfo = SetupDiGetClassDevs(
&GUID_DEVCLASS_BLUETOOTH,
0, 0, DIGCF_PRESENT);
if (hDevInfo == INVALID_HANDLE_VALUE)
{
// Insert error handling here.
return;//1;
}
// Enumerate through all devices in Set.
DeviceInfoData.cbSize = sizeof(SP_DEVINFO_DATA);
for (i = 0; SetupDiEnumDeviceInfo(hDevInfo, i,
&DeviceInfoData); i++)
{
DWORD DataT;
LPTSTR buffer = NULL;
DWORD buffersize = 0;
//This loop gets the name with SPDRP_FRIENDLYNAME
while (!SetupDiGetDeviceRegistryProperty(
hDevInfo,
&DeviceInfoData,
SPDRP_FRIENDLYNAME,
&DataT,
(PBYTE)buffer,
buffersize,
&buffersize))
{
if (GetLastError() == ERROR_INSUFFICIENT_BUFFER){
// Change the buffer size.
if (buffer) delete(buffer);
// Double the size to avoid problems on
// W2k MBCS systems per KB 888609.
buffer = new wchar_t[buffersize * 2];
}
else{
// Insert error handling here.
break;
}
}
DWORD DataT2;
LPTSTR buffer2 = NULL;
DWORD buffersize2 = 0;
//This Loop gets the Bluetooth Address with SPDRP_HARDWAREID
// NOTE: there is more information than just the address you will have
// to do some string manipulation to have just the address
while (!SetupDiGetDeviceRegistryProperty(
hDevInfo,
&DeviceInfoData,
SPDRP_HARDWAREID,
&DataT2,
(PBYTE)buffer2,
buffersize2,
&buffersize2))
{
if (GetLastError() == ERROR_INSUFFICIENT_BUFFER){
// Change the buffer size.
if (buffer2) delete(buffer2);
// Double the size to avoid problems on
// W2k MBCS systems per KB 888609.
buffer2 = new wchar_t[buffersize2 * 2];
}
else{
// Insert error handling here.
break;
}
}
if (buffersize > 0)
{
//do what you need with the info
//name is in buffer
//address is in buffer2
}
}
Next i get the handles in a different function because you need to enumerate over Interfaces and not info with SetupDiEnumDeviceInterfaces instead of SetupDiEnumDeviceInfo in the for loop
Using the bluetooth address I match the two and store appropriately