Passing class members functions as callbacks of setMultiPathStreamCallback

[engmarconi]

Hello
I'm created a class for firebase operation and I'm trying to pass class member functions as callback of Firebase.RTDB.setMultiPathStreamCallback but I got the following error:

error: no matching function for call to 'FB_RTDB::setMultiPathStreamCallback(FirebaseData*, void (MyClass::)(MultiPathStream), void (MyClass::)(bool))'
Firebase.RTDB.setMultiPathStreamCallback(&fbdo, &MyClass::streamCallback, &MyClass::streamTimeoutCallback);

I tried:
Firebase.RTDB.setMultiPathStreamCallback(&fbdo, &MyClass::streamCallback, &MyClass::streamTimeoutCallback);
and
Firebase.RTDB.setMultiPathStreamCallback(&fbdo,
std::bind(&MyClass::streamCallback, this),
std::bind(&MyClass::streamTimeoutCallback, this));

But I got the same error

Any help please

Regards
Marco

[mobizt]

You can declare your callback function as static inside your class. Using your class member function without object as a callback function is not allowed in C++.

You can create the ESP8266 schedule task that executes these 3 functions i.e. Firebase.readStream, stream.streamTimeout() and stream.streamAvailable() repeatedly in your class.

Firebase-ESP8266/examples/DataChangesListener/NoCallback/NoCallback.ino

Lines 165 to 176 in e2c2989

	if (!Firebase.readStream(stream))
	Serial.printf("sream read error, %s\n\n", stream.errorReason().c_str());
	if (stream.streamTimeout())
	{
	Serial.println("stream timed out, resuming...\n");
	if (!stream.httpConnected())
	Serial.printf("error code: %d, reason: %s\n\n", stream.httpCode(), stream.errorReason().c_str());
	}
	if (stream.streamAvailable())

And call to your callback function for the result.

This is the same way as the library works for callback.

[engmarconi]

First Thanks for your reply.
How I can read multistream with no callback?

[mobizt]

See the example I post above.

[engmarconi]

Thank you I got it.