Hi all! There should be a very simple task to add an element to an array, but I ca

Add item (char | char*) to Array about cjson HOT 3 CLOSED

Oleg-Perevyshin commented on June 9, 2024

Add item (char | char*) to Array

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Comments (3)

mbratch commented on June 9, 2024

The functions to do this already exist. Did you try using cJSON_CreateString and cJSON_AddItemToArray?

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daschfg commented on June 9, 2024

To expand on this: For a general idea how to do it, please have a look at the two Printing examples in the Readme.
In particular how the array resolutions is constructed and added to.
You would have to use cJSON_CreateString instead of cJSON_CreateObject.

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Oleg-Perevyshin commented on June 9, 2024

Yes, I looked at the example, but the documentation is not enough.
Thanks for the help!
My code:

char * langs_list(void) {
  File root = LittleFS.open("/langs", "r");
  if (!root || !root.isDirectory()) {
    return "[]";
  }
  File file = root.openNextFile();
  cJSON * langs_array = cJSON_CreateArray();
  if (langs_array == NULL) {
    cJSON_Delete(langs_array);
    return "[]";
  }
  while (file) {
    const char * fileName = file.name();
    char lang_name[3] = "";
    lang_name[0] = fileName[0];
    lang_name[1] = fileName[1];
    lang_name[2] = '\0';
    cJSON * name = cJSON_CreateString(lang_name);
    cJSON_AddItemToArray(langs_array, name);
    file = root.openNextFile();
  }
  char * langs_list = cJSON_PrintUnformatted(langs_array);
  if (langs_list == NULL) langs_list = "[]";
  cJSON_Delete(langs_array);
  return langs_list;
}

// In code
char * str = NULL;
str = langs_list();
//...
if (str != NULL) free(str);