ESP8266 SPIFFS leer

  server.on("/upload", HTTP_GET, []() {                 // if the client requests the upload page

    handleFileUploadDialog();

  });

  server.on("/upload", HTTP_POST,                       // if the client posts to the upload page

    [](){ server.send(200); },                          // Send status 200 (OK) to tell the client we are ready to receive

    handleFileUpload                                    // Receive and save the file

  );

void handleFileUploadDialog(){

    String page = FPSTR(HTTP_HEAD);

    page.replace("{v}", "File Upload");

    page += FPSTR(HTTP_STYLE);

    page += FPSTR(HTTP_JS_IMAGE);

    page += FPSTR(HTTP_HEAD_END);

    page += F("<h1>File Upload</h1><br />");

    page += F("<form action=\"/upload\" method=\"POST\" enctype=\"multipart/form-data\">");

    page += F("<input type=\"file\" name=\"data\">");

    page += F("<input type=\"submit\" value=\"Upload\">");

    page += F("</form>");

    page += FPSTR(HTTP_END);

    server.send(200, "text/html", page);

}

void handleFileUpload(){ // upload a new file to the SPIFFS

  HTTPUpload& upload = server.upload();

  if(upload.status == UPLOAD_FILE_START){

    String filename = upload.filename;

    if(!filename.startsWith("/")) filename = "/"+filename;

    Serial.print("handleFileUpload Name: "); Serial.println(filename);

    fsUploadFile = SPIFFS.open(filename, "w");            // Open the file for writing in SPIFFS (create if it doesn't exist)

    filename = String();

  } else if(upload.status == UPLOAD_FILE_WRITE){

    if(fsUploadFile)

      fsUploadFile.write(upload.buf, upload.currentSize); // Write the received bytes to the file

  } else if(upload.status == UPLOAD_FILE_END){

    if(fsUploadFile) {                                    // If the file was successfully created

      fsUploadFile.close();                               // Close the file again

      Serial.print("handleFileUpload Size: "); Serial.println(upload.totalSize);

      handleSuccess();

    } else {

      server.send(500, "text/plain", "500: couldn't create file");

    }

  }

}