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Программирование

Си

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Программирование с нуля

Python

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gcc

Ubuntu

00:00:02

Hello everyone, Dmitry is here, and in

00:00:05

today’s lesson we will begin to

00:00:07

examine a new topic: creating files,

00:00:11

creating files, reading data from files

00:00:15

and writing data

00:00:17

files. So, this topic, I think, is

00:00:21

quite interesting and

00:00:23

relevant. You can, for example, read

00:00:25

some data from files into your

00:00:26

program or, on the contrary, output

00:00:28

some of your data

00:00:30

to a

00:00:31

file on your hard

00:00:34

drive. So, let's first create a

00:00:38

new

00:00:43

file and call

00:00:51

it

00:00:58

Create and

00:01:01

create a read record, roughly speaking,

00:01:05

so in the comments I will write what we

00:01:08

will have and working with

00:01:13

files files

00:01:15

A

00:01:19

using A data type,

00:01:23

file

00:01:25

A and the function Open and

00:01:32

F

00:01:33

Open and

00:01:38

F So now I

00:01:48

connect the standard header file

00:01:50

ST and then let me immediately create

00:01:58

a constant that will be useful to us

00:02:04

further Well, the

00:02:06

Main function So working with

00:02:18

files So A in the standard

00:02:21

header file std o we

00:02:26

have a data type called a

00:02:28

pointer to

00:02:30

a file, it’s

00:02:32

called a file, then it goes on. Actually,

00:02:35

the pointer itself And the name of the pointer is

00:02:41

arbitrary, for example, file

00:02:43

PT That is, I created a pointer with a new

00:02:47

data type file, this is exactly the

00:02:50

file and PT, let’s say this is my

00:02:53

pointer now take certain

00:02:56

values

00:02:58

that

00:03:00

In general, it will

00:03:05

contain a pointer to the file. Yes, roughly

00:03:08

speaking, I’ll express myself further, you

00:03:11

will understand.

00:03:13

So, in order for us to open

00:03:18

a file, for example, create it or

00:03:21

open or write something to it, we

00:03:24

need to first open it And as you

00:03:27

probably already guessed, opening we will

00:03:28

produce exactly a pointer with a

00:03:30

file data type, it is this that will work with

00:03:34

our file, check whether the file is open, not

00:03:36

opened, and the like. So I

00:03:40

write the file PT equals That is, the file PT I

00:03:45

will write the

00:03:50

result of opening or not opening

00:03:53

our file So to begin with, we

00:03:55

will need to open the file in order to

00:03:57

open the file in the file and there is a

00:04:01

function called F

00:04:04

Open this function takes two

00:04:07

arguments, the first argument is a string literal

00:04:11

in this case it’s just

00:04:14

the name of the file for example New

00:04:19

F and then I I indicate that its

00:04:22

extension will be txt and the second argument is

00:04:25

again a string literal. In this

00:04:27

case, I must indicate

00:04:32

the mode in which I will open

00:04:34

My file, for example,

00:04:37

W

00:04:39

abbreviation

00:04:41

record So Now I’ll tell you a little

00:04:44

about these

00:04:46

abbreviations So The first is R

00:04:52

Why do we need R this

00:04:57

shadow? If we put it here, then

00:05:02

we will have this file. We will open this file

00:05:06

for

00:05:09

reading. That is, if we have a

00:05:11

file on our hard drive with this

00:05:13

name and this extension, then when we

00:05:16

specify R I I’ll open it if it opens

00:05:20

for reading That is, I can read

00:05:23

further from the file W

00:05:28

means It means

00:05:30

writing, for

00:05:32

example, writing to an existing file or

00:05:38

creating a new file That is, if

00:05:41

we don’t have such a file in the current directory on the

00:05:44

terrible disk, then W also creates a file

00:05:50

with this name and with this

00:05:51

extension that we

00:05:55

indicated here and it can also open an

00:05:58

existing file if we have one and

00:06:01

overwrite it, that is, this option,

00:06:04

if there is a file, opens it and

00:06:07

overwrites its entire

00:06:08

contents Erase the previous contents of the

00:06:13

file I hope it’s clear next option

00:06:18

a a is adding text to our

00:06:22

existing

00:06:26

file

00:06:28

opki file if it has not

00:06:33

been created and I also want to explain that a

00:06:36

adds some values to the file by

00:06:41

simply adding it and not like W

00:06:45

which is just

00:06:58

restarting for example

00:07:01

r+ What is r+ for? How you know R

00:07:05

opens for reading, yes, that is, it opens

00:07:09

by the way, these r+ modes only work in

00:07:13

text files.

00:07:15

That is, it opens the file for

00:07:19

reading Well, and for writing, that is, for

00:07:21

adding some text

00:07:24

w+ means that we open the file for

00:07:27

writing or for reading a text file Well,

00:07:32

ap means that we want to write

00:07:35

any information to the file before opening it

00:07:37

for reading or writing,

00:07:45

there are also such records as RB Or

00:07:49

let's say

00:07:50

wb this means that we will work

00:07:53

with a binary file means binary

00:07:56

Well, Actually, what you would need to

00:07:58

know is the argument of the function f Open; again,

00:08:02

the function F Open, in case of

00:08:06

good luck, for example, will return us a pointer to

00:08:09

our file. And in case of failure, F Open

00:08:12

returns data type N, that is,

00:08:15

nothing. So let's try it with you.

00:08:18

now create a new file So, as

00:08:21

you can see, I'm

00:08:23

trying to create W or write a new

00:08:28

file New F tex,

00:08:30

now I have to check what

00:08:31

the function F

00:08:33

Open returned from me if, for

00:08:36

example, ptr, but this is where

00:08:43

the value of the function f Open was returned If the returned

00:08:46

value is not equal

00:08:49

n

00:08:52

then I use the standard function and

00:08:55

write

00:08:57

what, for example, was

00:09:08

successfully

00:09:15

created. And if my file was not

00:09:21

created successfully, then

00:09:23

I have a standard error stream

00:09:26

called

00:09:27

stdr, I will send a message that it

00:09:34

was not possible to create or

00:09:37

open

00:09:39

the file and indicate which file, for example

00:09:43

this one

00:09:46

file And now I have to return the error code here, of

00:09:50

course, I

00:09:57

return it with wash

00:10:00

1 as you know Return 0 returns

00:10:04

that everything is fine and Return 1 returns

00:10:08

an error Well, in principle, our

00:10:11

program is written Let's try to

00:10:12

compile it So I use gcc -

00:10:18

O Create

00:10:20

Write so

00:10:25

X

00:10:28

so

00:10:31

missed

00:10:36

a letter So compile then

00:10:41

SSH X I launch As you can see, the

00:10:46

New File txt file has been successfully

00:10:49

created Well, let's check whether

00:10:52

he created it for us or not So I

00:10:55

'm in the New

00:10:56

File directory As you can see, here's the New file,

00:11:00

again I I can look at LS mi If

00:11:03

you want from the terminal Yes and how You see here

00:11:06

New file text I really have such a file

00:11:10

Let's look at it

00:11:14

So New F I'll try to open it As

00:11:17

you can see the file opens the file really

00:11:19

exists that is, we have successfully

00:11:21

created a new text file Excellent

00:11:25

now Let's

00:11:28

learn how to

00:11:30

read data from our file and then read data from

00:11:33

our

00:11:37

file Well, let's probably first

00:11:39

Let's learn how to read data from a

00:11:42

file So let's work with the

00:11:46

same file

00:11:47

New So Here in this branch

00:11:50

If if we have fa there is Lin Yam

00:11:58

here from this file So, to begin with,

00:12:01

of course, I have to write something into

00:12:02

this

00:12:03

file. So, for example, I’ll open a file and

00:12:07

let’s say I write something in it.

00:12:10

And

00:12:28

we

00:12:36

let it be. Here’s a simple line,

00:12:37

we’re programming in C language, we’re studying a

00:12:39

new topic on working with

00:12:41

files Well, just as an example

00:12:45

Yes, so now I need to read

00:12:48

data from a file So how can I do this?

00:12:51

I can read data from a file

00:12:53

using various functions, the simplest

00:12:55

option is to use the functions f and

00:12:59

Get C or FP S, or you could

00:13:05

use other functions but I

00:13:06

will use the FP S function. The

00:13:10

F

00:13:13

S function allows us oh fgts fgts allows

00:13:20

us to receive data from external

00:13:24

files or from any stream. In

00:13:26

this case, the stream we have is exactly this, this is

00:13:29

our index file PT if you don’t

00:13:32

know about the fgs function, then take a look my

00:13:34

previous videos there I described working with

00:13:37

this

00:13:38

function So fgs we receive three

00:13:41

arguments and the first argument is where

00:13:44

we want to

00:13:46

write our string in this case I have

00:13:50

nowhere to write yet so I’m writing

00:13:59

the contents of our text file As

00:14:02

you can see, I passed it a constant here n

00:14:07

as the dimension of this array

00:14:10

So I write what I want to

00:14:13

write a certain

00:14:17

number of

00:14:20

bytes in s Yes the length and I indicate where the file is from

00:14:27

T where I want to

00:14:31

write from So after I read

00:14:35

more precisely I received the data from the

00:14:44

file I need to output it to My

00:14:47

terminal for this I can use

00:14:49

ordinary functions Well, let me use

00:14:55

the function to

00:14:58

output what I want, I want to output

00:15:01

the contents of STR in this case, I better

00:15:03

use the percentage S And here I will write

00:15:10

STR Well, here I will put with a

00:15:15

line feed, that is, like this I I’ll just display

00:15:19

the contents of our array, that is, using

00:15:22

fgs I write a certain

00:15:26

number of characters in p, for example 100 Yes, from

00:15:30

the index of this file ptr file ptr

00:15:32

I have exactly this, this is mine This

00:15:35

file is open Well, let’s

00:15:39

see, let’s clean

00:15:41

the console,

00:15:46

compile fil New File Text has been successfully

00:15:52

created, so something happened here, but

00:15:56

we have an empty line. Uh-huh.

00:16:00

Let's then use

00:16:06

while, so for now

00:16:09

I have

00:16:11

the truth, I

00:16:27

read it, so the

00:16:31

Russians don’t want to read something, yes, but

00:16:34

my file is actually empty, why is it

00:16:38

empty, right? I had

00:16:43

a file opened before writing, so it

00:16:47

erased it from me,

00:16:48

so let’s replace W

00:16:52

with so for

00:16:57

reading, writing the file, let’s do

00:17:02

so with

00:17:30

the contents

00:17:33

So I started compiling and how

00:17:36

You see, I have a program C Language I

00:17:45

read everything perfectly,

00:17:49

let’s try to read the Russian text

00:17:54

Let’s write it

00:17:57

here

00:18:08

So I’m

00:18:11

closing Let’s

00:18:15

restart everything successfully, it works for us, it’s

00:18:18

readable in both English and

00:18:21

Russian, and in this case

00:18:26

sln could, in principle, not be

00:18:28

specified

00:18:33

So the New F text file has been successfully created

00:18:38

Everything worked out perfectly further We are

00:18:41

reading from the

00:18:43

file here are two lines which I read

00:18:46

from

00:18:47

the file here Of course, you can correct

00:18:50

something,

00:18:53

let’s say

00:19:09

we read the data from the

00:19:15

file and after closing.

00:19:20

Well, more precisely, when we finish

00:19:23

reading, we will also write a message

00:19:26

that the reading is completed.

00:19:43

So Let’s try again

00:19:57

recombination

00:20:00

so recombination

00:20:08

could be put here / N

00:20:19

Yes, for example, put it here like this

00:20:30

to make it more clear Yes, it’s clear

00:20:32

So

00:20:38

compiled from a file So I’m reading the

00:20:41

contents of the file PR programmed

00:20:45

working with files reading data from the

00:20:47

file

00:20:49

is completed Great, we just

00:20:51

learned how to read data from the

00:20:57

file, it’s formatted, that is, this solution

00:21:00

will work both on Linux and on

00:21:01

Windows Well, I think that it will also work on osx,

00:21:05

but well now Let's

00:21:09

try to write the data to a file instead of this is

00:21:12

how we read the

00:21:14

data Yes now Let's try to

00:21:16

write the data to our

00:21:20

file So let's

00:21:23

write to for example, after reading

00:21:26

data from a file I want to write something here and here

00:21:31

Well, let's Try to write

00:21:34

the data Yes, so I use another

00:21:38

Char array

00:21:42

Well, let it be

00:21:45

name, for example, I will pass here this

00:21:48

certain

00:21:57

length

00:22:21

So I have a string I I want to

00:22:27

write this line, for example, to our

00:22:29

file. So, what can I do? For

00:22:34

example, I can

00:22:39

use the function a

00:22:44

STR cpi Yes,

00:22:47

but I can just write

00:22:51

the file forcibly before.

00:22:54

So, after my reading is

00:22:56

completed, I want to simply

00:22:59

and Add this file How can I

00:23:01

do this I can use a regular

00:23:03

function called

00:23:09

F if you don’t know how to work with this

00:23:11

function then watch my previous

00:23:14

videos So the function takes two

00:23:17

arguments the first argument is what I want to

00:23:20

write for example

00:23:27

I’m a function

00:23:30

A string yes And where I want to write

00:23:34

write I want file

00:23:36

T, that is, in our open

00:23:40

file Well,

00:23:47

let me put

00:23:50

the line feed here so that

00:23:52

I have it so Let's

00:23:54

try to reforge

00:23:58

everything so

00:24:01

it worked for us I got the data read and

00:24:03

here I made a record Now let's

00:24:06

see have I written something to

00:24:08

my file So New File I open the file and

00:24:11

As you can see I have the line

00:24:15

byy From the lammer to the

00:24:17

programm here this is the name of my channel in this

00:24:21

simple way you can

00:24:24

write any data to a file or

00:24:26

write create a file completely Well,

00:24:29

this is a rather simple method,

00:24:32

we could of course

00:24:36

use, for example, other

00:24:38

possibilities Yes, other functions But with

00:24:42

this simple example, I

00:24:44

showed you How you can read data

00:24:48

from a file and how You see here you can it

00:24:54

was possible to write data into our file, including in Russian, write it in

00:25:02

English again,

00:25:04

let's see, yes

00:25:08

in Russian Add it

00:25:15

Yes, for example, Dmitry Yes, my

00:25:18

name

00:25:21

So the

00:25:26

compiled one should have been written down

00:25:29

So let's try to open it from here

00:25:33

As you can see,

00:25:36

I have a line written in

00:25:39

English and the line was written in

00:25:43

Russian That is, it’s

00:25:46

quite easy to

00:25:48

create your own files. First of all, you can

00:25:51

write

00:25:53

data to a file and you can read data

00:25:56

from a file, that is, write a file and

00:26:00

read data from a

00:26:02

file. Well, you can

00:26:05

modernize this program as you

00:26:08

want can be allowed Here,

00:26:13

directly in the console, specify the file

00:26:15

that you want to create or open

00:26:18

using command line arguments Yes,

00:26:21

well, you can already do this yourself Well,

00:26:24

Dmitry was with you, like,

00:26:26

subscribe to my channel if you like

00:26:29

like or and if you are not subscribed

00:26:31

Subscribe if you like the video Like the video

00:26:33

If you don’t like the video

00:26:35

put a dislike Well, in general, at your

00:26:38

discretion Well, I say goodbye to you

00:26:41

Good luck to everyone and

00:26:43

bye

Description:

Исходники из 37 урока: http://my-files.ru/2bjun2 Создание файла, чтение из файла, запись в файл на языке программирования Си. Данное решение является кросплатформенным и работает как на Linux так и Windows. Но есть и другие способы как все сделать вышеописанное на более низком уровне но реализация будет только под Linux ) Поддержать канал: If You want to support the channel: Донат / Donate RUB R939373054553 USD Z657301568665

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You can download a video to your smartphone using the website or the PWA application UDL Lite. It is also possible to send a download link via QR code using the UDL Helper extension.

How can I download an audio track (music) to MP3 "Программирование на Си урок 37: Работа с файлами в языке Си"?

The most convenient way is to use the UDL Client program, which supports converting video to MP3 format. In some cases, MP3 can also be downloaded through the UDL Helper extension.

How can I save a frame from a video "Программирование на Си урок 37: Работа с файлами в языке Си"?

This feature is available in the UDL Helper extension. Make sure that "Show the video snapshot button" is checked in the settings. A camera icon should appear in the lower right corner of the player to the left of the "Settings" icon. When you click on it, the current frame from the video will be saved to your computer in JPEG format.

What's the price of all this stuff?

It costs nothing. Our services are absolutely free for all users. There are no PRO subscriptions, no restrictions on the number or maximum length of downloaded videos.