available()
描述
回傳目前與 Client
連線的伺服端傳送過來的資料量,這些資料都是目前可以讀取的。
available()
是從 Stream 繼承而來。
語法
client.available()
參數
無參數
回傳
int
:目前可以讀取的資料量,以位元組為單位
範例
#include <WiFi.h> char ssid[] = "myNetwork"; // 無線網路的 SSID char pass[] = "myPassword"; // WPA 的密碼 int status = WL_IDLE_STATUS; char servername[]="google.com"; // Google WiFiClient client; void setup() { Serial.begin(9600); Serial.println("Attempting to connect to WPA network..."); Serial.print("SSID: "); Serial.println(ssid); status = WiFi.begin(ssid, pass); if ( status != WL_CONNECTED) { Serial.println("Couldn't get a wifi connection"); while(true); } else { Serial.println("Connected to wifi"); Serial.println("\nStarting connection..."); // 如果成功連線,透過序列埠印出訊息 if (client.connect(servername, 80)) { Serial.println("connected"); // 傳送 HTTP 封包 client.println("GET /search?q=arduino HTTP/1.0"); client.println(); } } } void loop() { // 如果有伺服端傳送過來的資料,讀取這些資料並且透過序列埠印出 if (client.available()) { char c = client.read(); Serial.print(c); } // 如果與伺服器的連線中斷,關閉 client if (!client.connected()) { Serial.println(); Serial.println("disconnecting."); client.stop(); for(;;) ; } }
The text of the 86Duino reference is a modification of the Arduino reference, and is licensed under a Creative Commons Attribution-ShareAlike 3.0 License. Code samples in the reference are released into the public domain.