No matching function for call to littlefsimpl

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i compiled a LITTLEFS file system code for esp32. But the compilation was not successful. It generate the following error

error: no matching function for call to 'LITTLEFSImpl::open(const char*&, const char [2])'
     File f = open(path, "r");
                            ^

What I have tried:

This is the following code that i compiled
#include <Arduino.h>
#include "FS.h"
#include <LITTLEFS.h>

#define FORMAT_LITTLEFS_IF_FAILED true

void setup(){
  
}
void loop(){
  
}

Posted 13-May-22 23:08pm

V_Jviji

Updated 13-May-22 23:30pm

v2

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OriginalGriff · Answer 1 · 2022-05-13T23:24:00

If you look at the GitHub source: Arduino/LittleFS.cpp at master · esp8266/Arduino · GitHub[^]
You will see that there are only one signature declared for LITTLEFSImpl::open

FileImplPtr LittleFSImpl::open(const char* path, OpenMode openMode, AccessMode accessMode) {

That requires three parameters, not two.

Richard MacCutchan · Answer 2 · 2022-05-13T23:30:00

Solution 2

The open function does not take a string as the second parameter, it takes a bit mask of the OpenMode constants. See _open, _wopen | Microsoft Docs[^] for the values defined in Microsoft's stdio.h.

Posted 13-May-22 23:30pm

Richard MacCutchan