available()



Açıklama

Okuma için kullanılabilir bayt sayısını (yani, bağlı olduğu sunucu tarafından istemciye yazılan veri miktarını) döndürür.

available (), Stream yardımcı program sınıfından miras alır.

Sözdizimi

istemci .available ()

Parametreler

Yok

İadeler

Kullanılabilir bayt sayısı.

Misal

/*
  Web client

 This sketch connects to a website through a GSM shield. Specifically,
 this example downloads the URL "http://arduino.cc/" and prints it
 to the Serial monitor.

 Circuit:
 * GSM shield attached to an Arduino
 * SIM card with a data plan

 created 8 Mar 2012
 by Tom Igoe

 http://arduino.cc/en/Tutorial/GSMExamplesWebClient

 */


// libraries
#include <GSM.h>

// PIN Number
#define PINNUMBER ""

// APN data
#define GPRS_APN       "GPRS_APN" // replace your GPRS APN
#define GPRS_LOGIN     "login"    // replace with your GPRS login
#define GPRS_PASSWORD  "password" // replace with your GPRS password

// initialize the library instance
GSMClient client;
GPRS gprs;
GSM gsmAccess;

// URL, path & port (for example: arduino.cc)
char server[] = "arduino.cc";
char path[] = "/";
int port = 80; // port 80 is the default for HTTP

void setup()
{
  // initialize serial communications
  Serial.begin(9600);
  Serial.println("Starting Arduino web client.");
  // connection state
  boolean notConnected = true;

  // After starting the modem with GSM.begin()
  // attach the shield to the GPRS network with the APN, login and password
  while(notConnected)
  {
    if((gsmAccess.begin(PINNUMBER)==GSM_READY) &
        (gprs.attachGPRS(GPRS_APN, GPRS_LOGIN, GPRS_PASSWORD)==GPRS_READY))
      notConnected = false;
    else
    {
      Serial.println("Not connected");
      delay(1000);
    }
  }

  Serial.println("connecting...");

  // if you get a connection, report back via serial:
  if (client.connect(server, port))
  {
    Serial.println("connected");
    // Make a HTTP request:
    client.print("GET ");
    client.print(path);
    client.println(" HTTP/1.0");
    client.println();
  }
  else
  {
    // if you didn't get a connection to the server:
    Serial.println("connection failed");
  }
}

void loop()
{
  // if there are incoming bytes available
  // from the server, read them and print them:
  if (client.available())
  {
    char c = client.read();
    Serial.print(c);
  }

  // if the server's disconnected, stop the client:
  if (!client.available() && !client.connected())
  {
    Serial.println();
    Serial.println("disconnecting.");
    client.stop();

    // do nothing forevermore:
    for(;;)
      ;
  }
}

See Also