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OA47

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Joined: 11/04/2012
Location: Australia
Posts: 926

Posted: 02:33am 25 Sep 2024

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What is the neatest and efficient way of checking that a directory exists on the SDCARD and creating it if it doesn't ?

I would like to save data to eg \2024\LOGFILES\ & \2024\EVTFILES\

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phil99

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Joined: 11/02/2018
Location: Australia
Posts: 2135

Posted: 02:57am 25 Sep 2024

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Quote MM.INFO(EXISTS FILE fname$)
Returns 1 if the file specified exists, returns -1 if fname$ is a directory,
otherwise returns 0.

MM.INFO(EXISTS DIR dirname$)
Returns a Boolean indicating whether the directory specified exits.

MKDIR dir$
Make, or create, the directory ‘dir$’ on the default Flash Filesystem or SD
Card

There may be a typo in the top one. The way it actually works makes more sense.

> ? MM.INFO(EXISTS dir "Temp")
1
> ? MM.INFO(EXISTS file "Temp")
0>

Edited 2024-09-25 13:13 by phil99

TassyJim

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Joined: 07/08/2011
Location: Australia
Posts: 6097

Posted: 03:08am 25 Sep 2024

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If the version of MMBasic you are using doesn't have MM.INFO(EXISTS

'
f$ = DIR$("2024/logfiles", DIR)
IF f$ = "" THEN
PRINT "does not exist"
ENDIF

Jim

VK7JH
MMedit MMBasic Help

OA47

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Joined: 11/04/2012
Location: Australia
Posts: 926

Posted: 03:13am 25 Sep 2024

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Thanks Phil, my question was a bit vague as I am looking at an older Armmite F4 and the reference in the handbook is:

MM.ERRNO
Is set to the error number if a statement involving the SD card fails or zero if
the operation succeeds. This is dependent on the setting of OPTION
ERROR. The possible values for MM.ERRNO are:
0 = No error
1 = No SD card found
2 = SD card is write protected
3 = Not enough space
6 = Cannot find file
7 = Cannot find file or directory
8 = Cannot create directory
12 = Hardware error
13 = File system error
14 = Directory not empty
16 = Syntax or general programming error

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phil99

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Joined: 11/02/2018
Location: Australia
Posts: 2135

Posted: 03:30am 25 Sep 2024

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You could update to F4 5.07.02. It has a lot of the latest features added.
https://www.thebackshed.com/forum/ViewTopic.php?TID=16169&P=6#211904

A consolidated manual for the Armmite F4 DRAFT 3 - 5.07.02 Beta 2 said
MM.INFO(EXISTS FILE file$)
Returns 1 if the file specified exists, returns -2 if fname$ is a directory,
otherwise returns 0

OA47

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Joined: 11/04/2012
Location: Australia
Posts: 926

Posted: 03:43am 25 Sep 2024

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Quote You could update to F4 5.07.02. It has a lot of the latest features added

Unfortunately, the target F4 is in a remote location and I can only access it via the console and there is no way to change the jumpers to re-flash it.

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OA47

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Location: Australia
Posts: 926

Posted: 04:50am 25 Sep 2024

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I should add the reason for the directory need is that the F4 had refused to read/write to the 16GB SD card. I travelled there a few days ago and replaced a 32Gb SD Card. I can read the 16Gb SD in the PC it shows around 350MB used but 2665 files in the root directory and I think it has reached some sort of limit and I might be able to make it last longer by using dated directories.

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