type TMessage is not a defined class with virtual function C++ builder sample - c++builder

Question

Im trying to use embarcadero sample on useing android camera and geting an error:
"type TMessage is not a defined class with virtual function" on lines:
void __fastcall TForm1::DoMessageListener(const TObject *Sender, TMessage const *M) {
TMessageDidFinishTakingImageFromLibrary const *v = dynamic_cast<TMessageDidFinishTakingImageFromLibrary const *>(M);
if (v) {
Image1->Bitmap->Assign(v->Value);
}
}

Answer 1

In Delphi, TMessage works fine, but in C++Builder you must use TMessageBase instead:
void __fastcall TForm1::DoMessageListener(const TObject *Sender, TMessageBase const *M)
This is clearly stated in the documentation:
Sending and Receiving Messages Using the RTL:
The RTL only defines one type of message, TMessage. It is actually a template that you can use to create messages for specific types of values; for example: TMessage<int> or TMessage<UnicodeString>. You can also subclass TMessage to define your own message types or, if you are using FireMonkey, you can reuse the message types defined by the framework.
Note: For C++ projects use TMessageBase instead of TMessage.
System.Messaging.TMessage
TMessage represents the base class used for message purposes. It can be inherited in order to send custom messages.
Warning: For C++ projects, use TMessageBase instead.
System.Messaging.TMessageBase
Alias to System.Messaging.TMessage.
Use System.Messaging.TMessageBase for C++ projects instead of System.Messaging.TMessage.
This use of TMessageBase is also demonstrated in the documentation's System.Messaging (C++) example.