php - Random messages from a .txt file for matrix7219 and esp8266 projects

Question

I have created with an esp8266 a system with the matrix7219 to write messages and view them on the 4 matrices, via an HTTP connected to my site. Through PHP I created a text file where each message is inserted with /n to go to the end, the last message is read through this code.

String getlastline(String str)
{
  String s="";
  int len=str.length();
  for (int i=len-2;i>=0;i--)
  {
    if (str[i]=='
')
    {
      break;
    }
    else
    {
      s=s+str[i];
     
    }
  }
  String rs="";
  for (int i=s.length()-1;i>=0;i--)
  {
    rs=rs+s[i];
  }
  return rs;

}

String ricevimessaggio()
{
  String lastmessaggio="";
  if(WiFi.status()==WL_CONNECTED)
  {
    HTTPClient http;
    String url="http://www.cinesaibai.com/messaggio.txt";
    http.begin(url);
    http.addHeader("Content-Type","text/plain");
    int httpCode=http.GET();
    String messaggio=http.getString();
    lastmessaggio=getlastline(messaggio);
   // Serial.println("il messaggio nuovo è:");
   Serial.println(lastmessaggio);
    http.end();
  }
  else
  {
    lastmessaggio="";
  }
  return lastmessaggio;
    delay(3000);
}

Now I wish I could get the random messages from the txt file.

Can anyone help me, Thanks

Answer 1

等待大神答复