ESP8266 Community Forum

- Tue Jun 07, 2016 11:36 am #48713 hello, i'm trying to use the read istruction , but i can't reat anyelse : the destinatin variabile , after executing istruction , is empty ( len(buffer) = 0 ) :

InfoP="/uploads/Pag1.txt"
print InfoP
READ InfoP testoPag$
print len(testoPag$)

i'm using branch 2.0

there's some error ? .. there is another way to read a file (I need to read a buffer to send it lo oled display , for a variety of page)

- Tue Jun 07, 2016 8:52 pm #48735 Rename your file to "/data/Pag1.dat" by selecting the file from the file manager and clicking rename.

when using the read command

Code: Select allread "Pag1" testoPag$

The read command will read the first line of text from the file. It really is intended for storing a single variable.

To create one of these files you can also use the write command.

These data elements were only intended for storing the contents of a single variable for later. Not for general purpose file I/O.

I might also suggest using the word() function if you need to place multiple values in to a single file. This will allow you to parse out individual bits of data from a large string.

Serial terminal in the chrome browser see https://serialTerminal.com

http://esp8266basic.com
A BASIC interpreter for your ESP

Working now on Autodrop3d. A 3d printer with automatic part ejection system. https://autodrop3d.com

- Wed Jun 08, 2016 12:47 am #48745 it's ok .. thank you ..

best regard Cesare

- Fri Jun 10, 2016 12:02 am #48912 Mark this to add to documentation.

Might want to address this as you did here in the documentation well done mmiscool this way people don't get the wrong idea of reads intended purpose and it will help things a bit via this great example and great question as well.

Helpful? Donate To help support Mike http://www.esp8266basic.com click the donate button lets keep this project going and hope we can get the ESP32 in the mix. BEGINNERS GUIDE HERE http://www.esp8266.com/viewtopic.php?f=40&t=6732

Where I buy my ESP8266 boards from... (Banggood)