FireMonkey BLE Android BluetoothLE1.GetCharacteristic fail

[pcplayer99 11]

Delphi 10.3.1

 

My steps:

 

1. BluetoothLE1.DiscoverDevices(3000);  Can find device, trigger BluetoothLE1EndDiscoverDevices event.

2. FDevice.DiscoverServices; can get services. I can got a service by: AService := BluetoothLE1.GetService(FDevice, MyService_ID);

3. and then if I call: ACharacteristic := BluetoothLE1.GetCharacteristic(AService, My_Characteristic_ID);  I got nil.

 

-----------

at 3, this method will be ok:

for I := 0 to AService.Characteristics.Count -1 do
  begin
    if Aservice.Characteristics.UUID = My_Characteristic_ID then
    begin
      ACharacteristic := Aservice.Characteristics;
      Break;
    end;
  end;

 

After I do this for loop, ACharacteristic := BluetoothLE1.GetCharacteristic(AService, My_Characteristic_ID); will get the right thing.

 

So, Is it a issue?

[Dave Nottage 557]

42 minutes ago, pcplayer99 said:

So, Is it a issue?

From the documentation:

 

  http://docwiki.embarcadero.com/Libraries/Rio/en/System.Bluetooth.Components.TBluetoothLE.GetCharacteristic

 

"Warning: You must read the value of the AService.Characteristics property before you call GetCharacteristic. Otherwise, GetCharacteristic returns nil."

 

 

[pcplayer99 11]

thanks a lot.