C / C++ / MFC

Not much of an improvement - more questions.
I am using the tutorial example and it is complaining about
missing "num" .
I am passing QString as variable number of parameters

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QString parameter = " TEST message ";
ProcessMessage_Variadic(1, " TEST message ");



So what is the problem - the macro
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 va_arg

declaration
 void ProcessMessage_Variadic(int num,...);

usage 
ProcessMessage_Variadic(1, " TEST message ");

<pre>
definition 
void RemoteSelector::ProcessMessage_Variadic (int num,...)
{

     ui->textEdit->append( "RemoteSelector::ProcessMessage_Variadic");
     QString s = "DUMMY";
     va_list valist;
     double sum = 0.0;
     int i;

     /* initialize valist for num number of arguments */
     va_start(valist, num);

     /* access all the arguments assigned to valist */
     for ( i = 0; i < num; i++) {
         s = va_arg(valist, num);

ERROR HERE 
/home/qy/Qt/Examples/Qt-5.15.0/bluetooth/btchat/remoteselector.cpp:396: error: unknown type name 'num'

       ui->textEdit->append(s); 
     }

     /* clean memory reserved for valist */
     va_end(valist);

     //return sum/num;
  }

I realize this is  very, very  long shot - but there must be somebody in the world coding  Bluetooth using QT. 
I am stuck with QT modification of bluez library / code. 
I have   QBluetoothServiceDiscoveryAgent::FullDiscovery - basically working.
But the responses  -  QT events aka SIGNALs timing is very random. 

Please , if you are not familiar with QT Bluetooth CODING 
DO NOT  RESPOND . 
Appreciate any help.