SPIFFS open problems

PlatformIO IDE
1

Hello,
I’m working with a Adafruit Feather HUZZAH ESP8266 and would like to transfer my web app to the ESP8266 with STIFFS, but when I want to make a:
File root = STIFFS.open("/");
I have the following errors (I’m using VSCode):

no instance of overloaded function “fs::FS::open” matches the argument list – argument types are: (const char [2]) – object type is: fs::FS:

conversion from ‘fs::Dir’ to non-scalar type ‘fs::File’ requested

I include: include <ESPAsyncWebServer.h>, <SPIFFSEditor.h> (because if I included just SPIFFS.h, I had an error) and <FS.h>
I don’t why it doesn’t work.
Thanks

2

This makes sense since / is the root directory so the return value should be a directory?

Anyways can you share your exact platformio.ini and code for reproduction?

3

Yes:

[env:huzzah]
platform = espressif8266
board = huzzah
framework = arduino

monitor_speed = 115200

lib_deps =
  ESP Async WebServer
  ESPAsyncTCP

But do you think my include are correct?

4

And your main code? EIther here enclosed with tripple backticks blocks or pastebin does fine

Also your IDE is VSCode right?

5 
#include <Arduino.h>
#include <ESPAsyncWebServer.h>
#include <SPIFFSEditor.h>
#include <FS.h>

const char *ssid = "ION-303";
const char *password = "censoredpassword";

const int led = 0;

AsyncWebServer server(80);

void setup() {
    //----------------------------------------------------Serial
  Serial.begin(115200);
  while(!Serial){}
  Serial.println("\n");

  //----------------------------------------------------GPIO
  pinMode(led, OUTPUT);
  digitalWrite(led, LOW);

    //----------------------------------------------------SPIFFS
  if(!SPIFFS.begin())
  {
    Serial.println("Erreur SPIFFS...");
    return;
  }

  File root = SPIFFS.open("/");
  File file = root.openNextFile();

    while(file)
  {
    Serial.print("File: ");
    Serial.println(file.name());
    file.close();
    file = root.openNextFile();
  }

    //----------------------------------------------------WIFI
  WiFi.begin(ssid, password);
	Serial.print("Tentative de connexion...");
	
	while(WiFi.status() != WL_CONNECTED)
	{
		Serial.print(".");
		delay(100);
	}
	
	Serial.println("\n");
	Serial.println("Connexion etablie!");
	Serial.print("Adresse IP: ");
	Serial.println(WiFi.localIP());

  //----------------------------------------------------SERVER
  server.on("/", HTTP_GET, [](AsyncWebServerRequest *request)
  {
    request->send(SPIFFS, "/index.html", "text/html");
  });

  server.on("/w3.css", HTTP_GET, [](AsyncWebServerRequest *request)
  {
    request->send(SPIFFS, "/w3.css", "text/css");
  });

  server.on("/script.js", HTTP_GET, [](AsyncWebServerRequest *request)
  {
    request->send(SPIFFS, "/script.js", "text/javascript");
  });

  server.on("/on", HTTP_GET, [](AsyncWebServerRequest *request)
  {
    digitalWrite(led, HIGH);
    request->send(200);
  });

  server.on("/off", HTTP_GET, [](AsyncWebServerRequest *request)
  {
    digitalWrite(led, LOW);
    request->send(200);
  });

  server.begin();
  Serial.println("Serveur actif!");
}

void loop() {
  // put your main code here, to run repeatedly:
}

Yes I’m using VSCode
Thanks

6

Yes the calling code is wrong. As you can see with the SPIFFS class which derives from FS (filesystem):

There is either uses File open(const char* path, const char* mode); or Dir openDir(const char* path);. But you’re using it here as File root = SPIFFS.open("/"); for which there is no overload. What you wanted to do is probably like in this unit test

(or also here)

But then you need to write File root = SPIFFS.open("/", "r");

1 Like
7

It’s working, thank you very much for your help!

1 Like