trochu programovania (Ar&^#$@)

Pondělí Prosinec 31 18:22:29 CET 2018

Zdravim osadenstvo,

programovanim nepoľúbený, mal by som velmi primitivnu otazku. Hram sa s 
ethernet modulom na Arduine (ano...), a neviem ako odovzdat parameter.

Vychadzal som z prikladu web servera. Vytvori sa server na porte 80 a 
ked mu pride poziadavka, tak vypluje text s primitivnou strankou.

V priklade je to napisane tak, ze testovanie ci prisla poziadavka aj 
odozva je napisana v hlavnej slucke. Chcel by som hlavnu slucku trochu 
upratat a odozvu odlozit do funkcie mimo hlavnu slucku. Urcite by to 
islo urobit aj cez prerusenie, ale programovat neviem, takze to je mimo 
moj dosah.

Takze som rozmyslal nad ponechanim testovania podmienky v hlavnej slucke 
a presunom zbytku do funkcie, vid kod:

void loop() {
   // listen for incoming clients
   EthernetClient client = server.available();
   if (client) {
     TreatConnection(); // if http request available, treat it
   }

}

// ------------------ various functions ----------------------

void TreatConnection() {

     Serial.println("new client");
     // an http request ends with a blank line
     boolean currentLineIsBlank = true;
     while (client.connected()) {
       if (client.available()) {
         char c = client.read();
         Serial.write(c);
         // if you've gotten to the end of the line (received a newline
         // character) and the line is blank, the http request has ended,
         // so you can send a reply
         if (c == '\n' && currentLineIsBlank) {
           // send a standard http response header
           client.println("HTTP/1.1 200 OK");
           client.println("Content-Type: text/html");
           client.println("Connection: close");  // the connection will 
be closed after completion of the response
           client.println("Refresh: 5");  // refresh the page 
automatically every 5 sec
           client.println();
           client.println("<!DOCTYPE HTML>");
           client.println("<html>");

           client.println("<b>Tu nieco vypis....</b><br>");
           client.println("Sensor readings:<br>");

           client.println("</html>");
           break;
         }
         if (c == '\n') {
           // you're starting a new line
           currentLineIsBlank = true;
         } else if (c != '\r') {
           // you've gotten a character on the current line
           currentLineIsBlank = false;
         }
       }
     }
     // give the web browser time to receive the data
     delay(1);
     client.stop(); // close the connection:
     Serial.println("client disconnected");
}

a vobec ma neprekvapuje, ze to nefunguje, vadi mu, ze vo funkcii nepozna 
'client':

/Control.ino: In function 'void TreatConnection()':
Control:185:12: error: 'client' was not declared in this scope
      while (client.connected()) {
             ^
Control:228:5: error: 'client' was not declared in this scope
      client.stop(); // close the connection:
      ^
Using library SPI at version 1.0 in folder: 
/Applications/Arduino.app/Contents/Java/hardware/arduino/avr/libraries/SPI
Using library Ethernet at version 2.0.0 in folder: 
/Applications/Arduino.app/Contents/Java/libraries/Ethernet
exit status 1
'client' was not declared in this scope

Otazka je ako mu v riadku TreatConnection() posunut informaciu co/kto je 
client?

Dakujem za nasmerovanie...

b.