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— | reference:library:ethernetudpavailable [2023/06/07 04:24] (当前版本) – 创建 - 外部编辑 127.0.0.1 | ||
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+ | [[zh: | ||
+ | ====== available() ====== | ||
+ | |||
+ | ===== 描述 ===== | ||
+ | |||
+ | 获取缓冲区存储的字节数。这是已经所接收的数据。 | ||
+ | |||
+ | 此函数只能在调用UDP.parsePacket() 后才能成功调用 | ||
+ | |||
+ | available()继承Stream实用程序类。。 | ||
+ | ===== 语法 ===== | ||
+ | |||
+ | UDP.available() | ||
+ | ===== 参数 ===== | ||
+ | |||
+ | 无 | ||
+ | ===== 返回 ===== | ||
+ | |||
+ | 可读取的字节数 | ||
+ | ===== 例子 ===== | ||
+ | <code cpp> | ||
+ | #include < | ||
+ | #include < | ||
+ | #include < | ||
+ | |||
+ | // | ||
+ | // IP地址将依赖于你的本地网络设定: | ||
+ | byte mac[] = { 0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED }; | ||
+ | IPAddress ip(192, 168, 1, 177); | ||
+ | unsigned int localPort = 8888; // | ||
+ | // | ||
+ | EthernetUDP Udp; | ||
+ | char packetBuffer[UDP_TX_PACKET_MAX_SIZE]; | ||
+ | |||
+ | void setup(){ | ||
+ | // | ||
+ | Ethernet.begin(mac, | ||
+ | Udp.begin(localPort); | ||
+ | } | ||
+ | |||
+ | void loop(){ | ||
+ | int packetSize = Udp.parsePacket(); | ||
+ | if(Udp.available()) | ||
+ | { | ||
+ | Serial.print(" | ||
+ | Serial.println(packetSize); | ||
+ | Serial.print(" | ||
+ | IPAddress remote = Udp.remoteIP(); | ||
+ | for (int i =0; i < 4; i++) | ||
+ | { | ||
+ | Serial.print(remote[i], | ||
+ | if (i < 3) | ||
+ | { | ||
+ | Serial.print(" | ||
+ | } | ||
+ | } | ||
+ | Serial.print(", | ||
+ | Serial.println(Udp.remotePort()); | ||
+ | // | ||
+ | Udp.read(packetBuffer, | ||
+ | Serial.println(" | ||
+ | Serial.println(packetBuffer); | ||
+ | } | ||
+ | } | ||
+ | |||
+ | </ | ||
+ | |||
+ | |||
+ | [[zh: | ||
+ | |||