public void WriteCccd(BleCharacteristic characteristic, BleCccd cccd, BleRequestFlags requestFlags)
{
Throw.If.Null(characteristic, "characteristic");
BleDescriptor descriptor;
if (!characteristic.TryGetDescriptor(BleUuids.Cccd, out descriptor))
{
HidSharpDiagnostics.Trace("Characteristic {0} does not have a CCCD, so {1} could not be written.", characteristic, cccd);
return;
}
if (cccd == BleCccd.Notification)
{
HidSharpDiagnostics.PerformStrictCheck(characteristic.IsNotifiable, "Characteristic doesn't support Notify.");
}
if (cccd == BleCccd.Indication)
{
HidSharpDiagnostics.PerformStrictCheck(characteristic.IsIndicatable, "Characteristic doesn't support Indicate.");
}
var value = new byte[2];
value[0] = (byte)((ushort)cccd >> 0);
value[1] = (byte)((ushort)cccd >> 8);
WriteDescriptor(descriptor, value);
}
public override void WriteCharacteristicWithoutResponse(BleCharacteristic characteristic, byte[] value, int offset, int count, BleRequestFlags requestFlags)
{
Throw.If.Null(characteristic, "characteristic");
HidSharpDiagnostics.PerformStrictCheck(characteristic.IsWritableWithoutResponse, "Characteristic doesn't support Write Without Response.");
var flags = GetGattFlags(requestFlags);
WriteCharacteristic(characteristic, value, offset, count, flags | NativeMethods.BLUETOOTH_GATT_FLAGS.WRITE_WITHOUT_RESPONSE);
}
public override void WriteCharacteristic(BleCharacteristic characteristic, byte[] value, int offset, int count, BleRequestFlags requestFlags)
{
Throw.If.Null(characteristic, "characteristic");
HidSharpDiagnostics.PerformStrictCheck(characteristic.IsWritable, "Characteristic doesn't support Write.");
var flags = GetGattFlags(requestFlags);
WriteCharacteristic(characteristic, value, offset, count, flags);
}
public override unsafe byte[] ReadCharacteristic(BleCharacteristic characteristic, BleRequestFlags requestFlags)
{
Throw.If.Null(characteristic, "characteristic");
HidSharpDiagnostics.PerformStrictCheck(characteristic.IsReadable, "Characteristic doesn't support Read.");
var flags = GetGattFlags(requestFlags);
HandleAcquireIfOpenOrFail();
try
{
lock (_readSync)
{
int error;
var wc = (WinBleCharacteristic)characteristic;
ushort valueSize;
error = NativeMethods.BluetoothGATTGetCharacteristicValue(_handle,
ref wc.NativeData,
0, null,
out valueSize,
flags | ((requestFlags & BleRequestFlags.Cacheable) == 0 ? NativeMethods.BLUETOOTH_GATT_FLAGS.FORCE_READ_FROM_DEVICE : 0));
if (error != NativeMethods.ERROR_MORE_DATA || valueSize < NativeMethods.BTH_LE_GATT_CHARACTERISTIC_VALUE.Size)
{
var message = string.Format("Failed to read characteristic {0}.", characteristic);
throw DeviceException.CreateIOException(Device, message, error);
}
var cb = stackalloc byte[valueSize];
var cv = (NativeMethods.BTH_LE_GATT_CHARACTERISTIC_VALUE *)cb;
ushort valueSize2;
error = NativeMethods.BluetoothGATTGetCharacteristicValue(_handle,
ref wc.NativeData,
valueSize,
cv,
out valueSize2,
flags);
if (error != 0 || valueSize != valueSize2 || cv->DataSize > valueSize - NativeMethods.BTH_LE_GATT_CHARACTERISTIC_VALUE.Size)
{
var message = string.Format("Failed to read characteristic {0}.", characteristic);
throw DeviceException.CreateIOException(Device, message, error);
}
var bytes = new byte[cv->DataSize];
Marshal.Copy((IntPtr)(void *)&cv->Data[0], bytes, 0, checked ((int)cv->DataSize));
return(bytes);
}
}
finally
{
HandleRelease();
}
}