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Write data to empty json file


By : Ato
Date : October 16 2020, 06:10 AM
Any of those help First I truncate the json file before first run.
code :
fs.readFile('output.json', 'utf-8', function (err, data) { 
    if (data === '') {
        json.push(newdata);
    }
fs.readFile('output.json', function (err, data) {
    if(data === '') {
        json = JSON.parse(newdata);
        json.push(newdata);
    }


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Create a json file , write Json data into it and Load the file into JsonDataAccess in bb 10 cascades


By : Steve
Date : March 29 2020, 07:55 AM
should help you out I have this method call , To save a QMap to a file:
code :
QFile file("out.txt");
if (!file.open(QIODevice::ReadOnly | QIODevice::Text)) {
     qWarning() << "Couldn't open file";
     return;
}

JsonDataAccess jda;
jda.save(map, &file);

how to write a empty json file with an object and array?


By : Oj Bairagi
Date : March 29 2020, 07:55 AM
I hope this helps you . You can simply do this, If u want to add required structure in empty file.
code :
try {
    FileWriter writer = new FileWriter(file);
    writer.append("{\"data\":[]}");
    writer.flush();
    writer.close();
} catch (IOException e) {
    e.printStackTrace();
}

How to check if JSON file is not empty and load JSON data from file in temp folder correctly?


By : Marten Meikop
Date : March 29 2020, 07:55 AM
will be helpful for those in need There are quite a few issues with your code, ie
program crashing if the file does not exist:
code :
with open(storage_path,'r') as f:
    print('each time I am creating the new one')
    with open(storage_path,'w') as f:
        data_base = {}
    f.close()
import argparse
import os
import tempfile
import json

storage = argparse.ArgumentParser()
storage.add_argument("--key", help="input key's name")
storage.add_argument("--val", help="value of key", default=None)
args = storage.parse_args()
storage_path = os.path.join(tempfile.gettempdir(), 'storage.data')

data_base = None
if os.path.exists(storage_path):
    with open(storage_path,'r') as f:
        try:
            data_base = json.load(f)
            print('loaded that: ',data_base)
        except Exception as e:
            print("got %s on json.load()" % e)

if data_base is None:
    print('each time I am creating the new one')
    data_base = {}
    with open(storage_path,'w') as f:
        json.dump(data_base, f)

# don't prevent the user to set `"Not found" as value, if might
# be a legitimate value.
# NB : you don't check if `args.key` is actually set... maybe you should ?

sentinel = object()    
if data_base.get(args.key, sentinel) is sentinel:         
    if args.val is not None:
        data_base[args.key] = args.val
        with open(storage_path, 'w') as f:
            json.dump(data_base, f)
            print('dumped this: ',data_base)

Write URL data to file is empty


By : user2147503
Date : March 29 2020, 07:55 AM
I wish this helpful for you You should explicitly flush and close your writer, and not assume Java will do it for you when the program terminates:
code :
bw.flush();
bw.close();

How to write JSON data to Dynamodb by ignoring empty elements in boto3


By : Martiazoo
Date : March 29 2020, 07:55 AM
I hope this helps . I would like to write the following data group to Dynamodb. , I solved my problem. You can set null as follows.
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