代码是Arduino C++，如何在HTTP Client中将ledstatus显示为“on”或“off”？
if语句中的Led / status不喜欢Ledstatus = off；或Ledstatus = on；为什么？但是，如果我用数字代替，该方法起作用了吗？
请帮忙？
/*
Web Server
A simple web server that shows the value of the analog input pins.
using an Arduino Wiznet Ethernet shield.
Circuit:
* Ethernet shield attached to pins 10, 11, 12, 13
* Analog inputs attached to pins A0 through A5 (optional)
created 18 Dec 2009
by David A. Mellis
modified 9 Apr 2012
by Tom Igoe
*/
#include <SPI.h>
#include <Ethernet.h>
#include <Wire.h>
// Enter a MAC address and IP address for your controller below.
// The IP address will be dependent on your local network:
byte mac[] = {
0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED
};
IPAddress ip(10,0, 0, 210);
char linebuffer[20];
int linenumber = 0;
boolean IsLed = false;
// (Spa Variables):
int LedOn;
int Ledstatus;
// Initialize the Ethernet server library
// with the IP address and port you want to use
// (port 80 is default for HTTP):
EthernetServer server(80);
void setup() {
// Open serial communications and wait for port to open:
Serial.begin(9600);
while (!Serial) {
; // wait for serial port to connect. Needed for Leonardo only
}
// Set Digital Pin 12 to output:
pinMode(12,OUTPUT);
// start the Ethernet connection and the server:
Ethernet.begin(mac, ip);
server.begin();
Serial.print("server is at ");
Serial.println(Ethernet.localIP());
digitalWrite (12,LOW);
}
void loop() {
// listen for incoming clients
EthernetClient client = server.available();
if (client) {
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
parseRequest();
//sendHTTPResponse(client);
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("OK ");
client.print(IsLed);
client.print(Ledstatus);
char linebuffer[20]; //Clear the line buffer
linenumber = 0;
break;
}
if (c == '\n'){
// you're starting a new line
currentLineIsBlank = true;
}else if (c != '\r') {
if(linenumber <20){ //If there is room in the buffer
linebuffer[linenumber] = c; //Add char to the buffer
linenumber++; //Increment the counter
}
// you've gotten a character on the current line
currentLineIsBlank = false;
}
}
}
// give the web browser time to receive the data
delay(10);
// close the connection:
client.stop();
Serial.println("client disconnected");
}
}
void parseRequest(){
if(linebuffer[5] == 'O' && linebuffer[6] == 'N'){ //if the request was for ON
//Turn on the LED
IsLed = true;
digitalWrite (12,LOW);
Serial.println("isLed ON");
Ledstatus= on;
}else{(linebuffer[5] == 'O' && linebuffer [6] == 'F' && linebuffer [7] == 'F'); //if the request was for OFF
//Turn OFF the LED
IsLed = false;
digitalWrite(12,HIGH);
Serial.println("isLed OFF");
Serial.println();
Ledstatus = off;
}
}
最佳答案
我想我终于找到了您，因为您的代码有些混乱!如您在注释中所写，您将得到一个OK10或OKOO，因为您正在代码中打印此代码:
...
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("OK "); //Prints OK of course
client.print(IsLed); //Prints an int!!
client.print(Ledstatus); //Also prints an int!!
...
您需要将其更改为以下内容:
...
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.print("OK "); //Prints OK of course
if(Ledstatus == on)
client.println("ON");
else
client.println("OFF");
...
也是我在评论中提到的内容，您没有从客户端读取行缓冲区，但正在解析它。它会是空的!我不知道API，但必须有一个类似于
client.read(linubuffer, 20);