import data from cpp file into arduino sketch

i want import myLine variable that is in cpp library into arduino sketch But not return a “line” value.
this is my cpp file:

void HTTPSRedirect::fetchData(bool disp, bool header){

	String line;

	pinMode(2, OUTPUT);
  
	while (connected()) {
		line = readStringUntil('\n');
			
		if (disp)
			Serial.println(line);
			if(line == "On\r"){
			//Serial.println("Led On");
			digitalWrite(2, HIGH);
			}
			if(line == "Off\r"){
			//Serial.println("Led Off");
			digitalWrite(2, LOW);
		}
	  
		if (line == "\r") {
			if (disp){
				if (header) DPRINTLN("END OF HEADER");
				else DPRINTLN("END OF RESPONSE");
				//DPRINTLN(line);
			}
			break;
		}
	}
	myLine = line;
	//Serial.println(client.myLine);
}

i only work with this function:

void HTTPSRedirect::fetchData(bool disp, bool header){

	String line;

	pinMode(2, OUTPUT);
  
	while (connected()) {
		line = readStringUntil('\n');
			
		if (disp)
			Serial.println(line);
			if(line == "On\r"){
			//Serial.println("Led On");
			digitalWrite(2, HIGH);
			}
			if(line == "Off\r"){
			//Serial.println("Led Off");
			digitalWrite(2, LOW);
		}
	  
		if (line == "\r") {
			if (disp){
				if (header) DPRINTLN("END OF HEADER");
				else DPRINTLN("END OF RESPONSE");
				//DPRINTLN(line);
			}
			break;
		}
	}
	myLine = line;
	//Serial.println(client.myLine);
}

this is my header file:

/*  HTTPS with follow-redirect
 *  Created by Sujay S. Phadke, 2016
 *  All rights reserved.
 *
 */

#include <WiFiClientSecure.h>
#include "Arduino.h"	

class HTTPSRedirect : public WiFiClientSecure {
  private:
    const int httpsPort;
    const char* redirFingerprint;
    bool fpCheck = false;
    bool keepAlive = true;
    bool verboseInfo = false;
    
  public:
	String myLine="";
	
    HTTPSRedirect(const int, const char*, bool);
    HTTPSRedirect(const int);
    ~HTTPSRedirect();

    bool printRedir(const char*, const char*, const char*);
    bool printRedir(String&, const char*, const char*);
    String createRequest(const char*, const char*);
    void fetchData(bool, bool);

};

and this is my shetch:

/*
 *  HTTPS with follow-redirect example
 *  Created by Sujay S. Phadke, 2016
 *  
 *  Based on the WifiClientSecure example by
 *  Ivan Grokhotkov
 *  
 *
 *  This example is in public domain.
 * 
 *   Modified by PDAControl 
 *  http://pdacontrolenglish.blogspot.com.co
 *  http://pdacontrol.blogspot.com.co 
 *  https://youtu.be/5f7wCeD4gB4  -- TUTORIAL
 */

#include <ESP8266WiFi.h>
#include "HTTPSRedirect.h"


// Replace with your network credentials
const char* ssid = "sajjad";
const char* password = "1q2w3e4r5t6y";

const char* host = "script.google.com";
const char* googleRedirHost = "script.googleusercontent.com";
const char *GScriptId = "AKfycbyOZ2agkz7Udy7L43aitJP0DgM1dlaAsAnJ7tudm9_wod7ZdNM";

const int httpsPort = 443;

// http://askubuntu.com/questions/156620/how-to-verify-the-ssl-fingerprint-by-command-line-wget-curl/
// echo | openssl s_client -connect script.google.com:443 |& openssl x509 -fingerprint -noout
// www.grc.com doesn't seem to get the right fingerprint
// SHA1 fingerprint of the certificate
//const char* fingerprint = "94 2F 19 F7 A8 B4 5B 09 90 34 36 B2 2A C4 7F 17 06 AC 6A 2E";
const char* fingerprint = "F0 5C 74 77 3F 6B 25 D7 3B 66 4D 43 2F 7E BC 5B E9 28 86 AD";
const char* fingerprint2 = "94 64 D8 75 DE 5D 3A E6 3B A7 B6 15 52 72 CC 51 7A BA 2B BE";

// Write to Google Spreadsheet
String url = String("/macros/s/") + GScriptId + "/exec?value=Hello";
// Fetch Google Calendar events for 1 week ahead
String url2 = String("/macros/s/") + GScriptId + "/exec?cal";
// Read from Google Spreadsheet
String url3 = String("/macros/s/") + GScriptId + "/exec?read";

void setup() {
  Serial.begin(115200);
  Serial.println();
  Serial.print("Connecting to wifi: ");
  Serial.println(ssid);
  // flush() is needed to print the above (connecting...) message reliably, 
  // in case the wireless connection doesn't go through
  Serial.flush();

  WiFi.begin(ssid, password);
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }
  Serial.println("");
  Serial.println("WiFi connected");
  Serial.println("IP address: ");
  Serial.println(WiFi.localIP());

  // Use HTTPSRedirect class to create TLS connection
  HTTPSRedirect client(httpsPort);
  Serial.print("Connecting to ");
  Serial.println(host);

  bool flag = false;
  for (int i=0; i<5; i++){
    int retval = client.connect(host, httpsPort);
    if (retval == 1) {
       flag = true;
       break;
    }
    else
      Serial.println("Connection failed. Retrying...");
  }
  
  Serial.flush();
  if (!flag){
    Serial.print("Could not connect to server: ");
    Serial.println(host);
    Serial.println("Exiting...");
    return;
  }
  
  Serial.flush();
  if (client.verify(fingerprint, host)) {
    Serial.println("Certificate match.");
  } else {
    Serial.println("Certificate mis-match");
  }

  // Note: setup() must finish within approx. 1s, or the the watchdog timer
  // will reset the chip. Hence don't put too many requests in setup()
  // ref: https://github.com/esp8266/Arduino/issues/34
  
  //Serial.print("Requesting URL: ");
  //Serial.println(url);

  client.printRedir(url, host, googleRedirHost);
  Serial.println("==============================================================================");
  
//  client.printRedir(url2, host, googleRedirHost);
 // Serial.println("==============================================================================");

}

void loop() {
  HTTPSRedirect client(httpsPort);
  if (!client.connected())
    client.connect(host, httpsPort);

  client.printRedir(url3, host, googleRedirHost);
  
// client.fetchData;
  Serial.println("***");
  Serial.println(client.myLine);
  Serial.println("***");
  // In my testing on a ESP-01, a delay of less than 1500 resulted 
  // in a crash and reboot after about 50 loop runs.
  delay(1500);
}

i see in Serial monitor:
On <— Serial.print(line) that is in cpp file
***
** ← i dont see On :(**
***

please help me

i want import myLine variable that is in cpp library into arduino sketch

I really have no idea what you mean by "import". A variable is a memory address. That address is either in scope or it isn't. If it is, there is no need to import anything. If it isn't, there is no meaning to "import".

			Serial.println(line);

Anonymous, undelimited printing of strings is stupid. Print the name of the variable AND print something before AND after the string, so you really have a handle on what is printed.