ESP8266 Community Forum

- Fri Aug 14, 2015 12:39 pm #25978 Martin, Awesome works

Super cool mate.

How can I read and print the contents of a spiffs file to serial window, and search for a specific value?

Need some more examples of spiffs one thinks, not from an avid C background.

Thanks mate

Dans

- Fri Aug 14, 2015 1:36 pm #25982

How can I read and print the contents of a spiffs file to serial window, and search for a specific value?

That would be something like :

Code: Select all    if (!SPIFFS.begin()) {
      Serial.println("SPIFFS failed to mount !\r\n");                   
    }
    else {
      File f = SPIFFS.open("/Config.cfg", "r");
      if (!f) {
        Serial.println("Can't open Config.cfg !\r\n");         
      }
      else {
        char buf[1024];
        f.read((uint8_t *)buf, sizeof(buf));
        f.close();
        Serial.println(buf);
      }
    }


Beware that this small snippet doesn't handle reading of more than 1024, it is reading the whole file in single shot if shorter than 1024. It was only to give you a quick example ASAP.
But the FS.h provides available() method, so it is pretty easy to read file line by line until EOF instead of the previous block read example ...

- Fri Aug 14, 2015 2:36 pm #25989 Martin,

Massive thanks for these snips, I am aware of the 1024 size limitations, Once I get a handle on file operations I will
add checking to all routines to ensure the file size falls within this region.

Thanks so much for all your time on this, much appreciated. I have my sketch already downloading files from a server in the cloud and creating local files on the ESP

Dans

- Fri Aug 14, 2015 2:54 pm #25991 You can also rely on f.fileSize() and do a while loop, so it will work with any file sizes ...