標題: 想請問Arduino內的範例SimpleWebServerWiFi 的問題 [打印本頁] 作者: powq9764 時間: 2017-11-20 13:41 標題: 想請問Arduino內的範例SimpleWebServerWiFi 的問題 if (client) { // if you get a client,
Serial.println("new client"); // print a message out the serial port
String currentLine = ""; // make a String to hold incoming data from the client
while (client.connected()) { // loop while the client's connected
if (client.available()) { // if there's bytes to read from the client,
char c = client.read(); // read a byte, then
Serial.write(c); // print it out the serial monitor
if (c == '\n') { // if the byte is a newline character
// if the current line is blank, you got two newline characters in a row.
// that's the end of the client HTTP request, so send a response:
if (currentLine.length() == 0) {
// HTTP headers always start with a response code (e.g. HTTP/1.1 200 OK)
// and a content-type so the client knows what's coming, then a blank line:
client.println("HTTP/1.1 200 OK");
client.println("Content-type:text/html");
client.println();
// the content of the HTTP response follows the header:
client.print("Click <a href=\"/H\">here</a> turn the LED on pin 9 on<br>");
client.print("Click <a href=\"/L\">here</a> turn the LED on pin 9 off<br>");
// The HTTP response ends with another blank line:
client.println();
// break out of the while loop:
break;
} else { // if you got a newline, then clear currentLine:
currentLine = "";
}
} else if (c != '\r') { // if you got anything else but a carriage return character,
currentLine += c; // add it to the end of the currentLine
}
// Check to see if the client request was "GET /H" or "GET /L":
if (currentLine.endsWith("GET /H")) {
digitalWrite(9, HIGH); // GET /H turns the LED on
}
if (currentLine.endsWith("GET /L")) {
digitalWrite(9, LOW); // GET /L turns the LED off
}
}
}
// close the connection:
client.stop();
Serial.println("client disonnected");
}
想請問 c在這幾行程式中 扮演的是甚麼角色
以及 if (c == '\n') else if (c != '\r') currentLine += c;
因為網頁長這個樣子
Click <a href=\"/H\">here</a> turn the LED on pin 9 on<br>
Click <a href=\"/L\">here</a> turn the LED on pin 9 off<br>
所以當你按下了網頁的H 的 here (或 L 的 here )
瀏灠器就需要去取得H這個網頁(或 L)