BluetoothGATTGetIncludedServices function

The BluetoothGATTGetIncludedServices function gets all the included services available for a given service.

Syntax

HRESULT BluetoothGATTGetIncludedServices(
  HANDLE               hDevice,
  PBTH_LE_GATT_SERVICE ParentService,
  USHORT               IncludedServicesBufferCount,
  PBTH_LE_GATT_SERVICE IncludedServicesBuffer,
  USHORT               *IncludedServicesBufferActual,
  ULONG                Flags
);

Parameters

hDevice

Handle to the Bluetooth device or parent service.

ParentService

Address of a BTH_LE_GATT_SERVICE structure that contains the parent service of the included services to be retrieved. This parameter is required if a device handle is passed to hDevice. This parameter is optional if a service handle was passed to hDevice, in which case the service specified by the service handle will be treated as the parent.

IncludedServicesBufferCount

The number of elements allocated for the IncludedServicesBuffer parameter.

IncludedServicesBuffer

Address of a buffer containing a BTH_LE_GATT_SERVICE structure into which to return included services.

IncludedServicesBufferActual

Pointer to buffer into which the actual number of included services were returned in the IncludedServicesBuffer parameter.

Flags

Flags to modify the behavior of BluetoothGATTGetIncludedServices:

Flag Description
BLUETOOTH_GATT_FLAG_NONE The client does not have specific GATT requirements (default).

Return Value

This function returns the following values:

Return code Description
S_OK
The operation completed successfully.
ERROR_MORE_DATA
The buffer parameter is NULL and the number of items available is being returned instead.
ERROR_ACCESS_DENIED
Returned if both a parent service and a service handle are provided and the service hierarchy does not roll up to the provided parent service handle.
ERROR_INVALID_PARAMETER
One of the following conditions occurred:
  • IncludedServicesBuffer is NULL, and IncludedServicesBufferCount is 0.
  • IncludedServicesBuffer is non-NULL, but IncludedServicesBufferCount is NULL.
  • IncludedServicesBuffer is non-NULL, and IncludedServicesBufferCount is 0.
ERROR_INVALID_USER_BUFFER
A buffer is specified, but the buffer count size is smaller than what is required, in bytes.
ERROR_INVALID_FUNCTION
Services were specified to be retrieved from the cache, but no services are present in the cache.
ERROR_BAD_COMMAND
The current data in the cache appears to be inconsistent, and is leading to internal errors.
ERROR_NO_SYSTEM_RESOURCES
The operation ran out of memory.

Remarks

Returned services are cached upon successful retrieval of services from the device directly. Unless a service-change event is received, the list of returned services is not expected to change.

Profile drivers should pre-allocate a sufficiently large buffer for the array of primary services to be returned in. Callers can determine the necessary buffer size by passing a non-NULL value in IncludedServicesBufferActual and NULL in IncludedServicesBuffer.

Do not modify the returned service structure, and then use the modified structure in subsequent function calls. Behavior is undefined if the caller does this.

Example

C++
////////////////////////////////////////////////////////////////////////////
// Determine Included Services Buffer Size
////////////////////////////////////////////////////////////////////////////
hr = BluetoothGATTGetIncludedServices(
     hLEDevice,
     gattService,
     0,
     NULL,
     &inclServicesBufferSize,
     BLUETOOTH_GATT_FLAG_NONE);
 if (HRESULT_FROM_WIN32(ERROR_MORE_DATA) != hr) {
     PrintHr("BluetoothGATTGetIncludedServices - Buffer Size", hr);
     goto Done;
 }

 if (inclServicesBufferSize > 0) {
     pInclServicesBuffer = (PBTH_LE_GATT_ PBTH_LE_GATT_SERVICE)
                malloc(inclServicesBufferSize * sizeof(BTH_LE_GATT_SERVICE));

     if (NULL == pInclServicesBuffer) {
         printf("pInclServicesBuffer out of memory\r\n");
         goto Done;
     } else {
         RtlZeroMemory(pInclServicesBuffer, 
                inclServicesBufferSize * sizeof(BTH_LE_GATT_SERVICE));
     }

     ////////////////////////////////////////////////////////////////////////////
     // Retrieve Included Services
     ////////////////////////////////////////////////////////////////////////////

     hr = BluetoothGATTGetIncludedServices (
          hLEDevice,
          gattService,
          inclServicesBufferSize,
          pInclServicesBuffer,
          &numIncludedServices
          BLUETOOTH_GATT_FLAG_NONE);

     if (S_OK != hr) {
         PrintHr("BluetoothGATTGetIncludedServices - Actual Data", hr);
         goto Done;
     }
 }</pre>

Requirements

   
Windows version Supported in Windows 8 and later versions of Windows.
Target Platform Universal
Header bluetoothleapis.h
Library BluetoothApis.lib
DLL BluetoothAPIs.dll

See Also

BTH_LE_GATT_SERVICE