esp8266 read webpage information

Projects Programming
1

I using this code:

#include <ESP8266WiFi.h>

const char* ssid = "Signalizacija";
const char* password =  "20170214";


const char* host = "ortex.lt";
String line;

void setup()
{
  Serial.begin(115200);
  Serial.println();

  Serial.printf("Connecting to %s ", ssid);
  WiFi.begin(ssid, password);
  while (WiFi.status() != WL_CONNECTED)
  {
    delay(500);
    Serial.print(".");
  }
  Serial.println(" connected");
}


void loop()
{
  WiFiClient client;
  Serial.printf("\n[Connecting to %s ... ", host);
  if (client.connect(host, 80))
  {
    Serial.println("connected]");

    Serial.println("[Sending a request]");
    String url = "/testas.php";
    client.print(String("GET /") + url + " HTTP/1.1\r\n" +
                 "Host: " + host + "\r\n" +
               "Connection: close\r\n" +
                "\r\n"
                );

    Serial.println("[Response:]");
    while (client.connected())
   {    
    line = client.readStringUntil('\r');
    Serial.print(line);
   }

    client.stop();
    Serial.println("\n[Disconnected]");
  }
  else
  {
    Serial.println("connection failed!]");
    client.stop();
  }  
  delay(5000);
}

I got this information (attached picture), but I want to read only word which I underline red color "saule". How need separate this word from total html code? Could somebody give to my advice how to do it?

esp8266.png

2

attached picture

Why the f**k would you post a picture of TEXT? Post the damned text, so that it can be read!

It appears that you want the text between the and tags.
One of the Strings that you read contains "" (or some part of it). One of the Strings you read contains "" (or some part of it).

You should create ONE String containing ALL that you read, and then find the indexOf() the "" tag and the indexOf() the "" tag, and create a substring() of the part between the tags.

3

use client.find(""), client.readBytesUntil("", buff, sizeof(buff)) and take the content of buff from sizeof("") position.

this are functions of class Stream from which WiFiClient is derived

4

ok, I try to using array

5

Juraj:
use client.find(""), client.readBytesUntil("", buff, sizeof(buff)) and take the content of buff from sizeof("") position.

this are functions of class Stream from which WiFiClient is derived

You have in mind this code

char* buff[8];
while (client.connected())
{
client.find("");
client.readBytesUntil("", buff, sizeof(buff));
}
Serial.println(buff);

6

yes, but I am not sure on the stream position after find or readUntil, if it will add or to buff. I hope not.

7

Juraj:
yes

I hope not. An array of 8 pointers to char is NOT what client.readBytesUntil() is expecting.

8

PaulS:
I hope not. An array of 8 pointers to char is NOT what client.readBytesUntil() is expecting.

ups, I overlooked the *, thank you

@pcwortex, char buff[8], the function takes a pointer to char but C array type is pointer

9

Juraj:
ups, I overlooked the *

@pcwortex, char buff[8], the function takes a pointer to char but C array type is pointer

I got error and don't know how solve it

C:\Users\sarunas\Documents\Arduino\readserver\readserver.ino: In function 'void loop()':

readserver:50: error: no matching function for call to 'WiFiClient::readBytesUntil(const char [8], char* [8], unsigned int)'

client.readBytesUntil("", buff, sizeof(buff));

10

pcwortex:
I got error and don't know how solve it

C:\Users\sarunas\Documents\Arduino\readserver\readserver.ino: In function 'void loop()':

readserver:50: error: no matching function for call to 'WiFiClient::readBytesUntil(const char [8], char* [8], unsigned int)'

client.readBytesUntil("", buff, sizeof(buff));

change char * buff[8] to char buff[8]

11

Juraj:
change char * buff[8] to char buff[8]

I change, but have same problem before it :frowning:

exit status 1
invalid conversion from 'const char*' to 'char' [-fpermissive]

I don't know what is wrong. Somebody can to give me suggest how solve this problem?

12

I am sorry. The readBytesUntil can find only one character. Use readBytesUntil('<', buff, sizeof(buff));