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Interacting with HTML5 Canvas for Complete Beginners

Interacting with HTML5 Canvas for Complete Beginners

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C (Programming Language)

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c

read

file

00:00:02

all right people so in this video i'm

00:00:04

going to show you how we can read the

00:00:05

contents of a file someplace on your

00:00:07

computer you can either place this

00:00:09

within the same folder as your c program

00:00:12

or someplace else i think it would be

00:00:13

cool if we read a file from our desktops

00:00:16

so i'm going to create a new file and

00:00:18

this is going to be a plain text file

00:00:20

and i'll write a poem i'll name this

00:00:22

poem.txt

00:00:24

here's my beautiful poem

00:00:26

roses are red

00:00:29

violets are blue

00:00:32

booty booty booty booty

00:00:37

rockin

00:00:38

everywhere

00:00:40

okay i'm going to save

00:00:42

and then i'll need the file location of

00:00:44

where this is located i'm going to right

00:00:46

click go to properties and copy this

00:00:48

file path and save it for later now to

00:00:51

read a file on your computer we'll need

00:00:53

to create a pointer the data type is

00:00:56

file

00:00:57

and i'll name this

00:00:58

p

00:00:59

f and i will set the sequel to then

00:01:01

invoke the f open function

00:01:04

pass in your file mine is

00:01:07

poem.txt

00:01:08

so if this file is not within the same

00:01:11

folder as your c program you'll need a

00:01:13

relative or absolute file path since

00:01:16

this file is on my desktop i could use

00:01:19

an absolute file path

00:01:20

so preceding my file name i will paste

00:01:23

that location and then each backslash

00:01:26

may need to be a double backslash

00:01:28

because that is an escape sequence for a

00:01:30

backslash character okay the second

00:01:32

argument is the mode this time we are

00:01:35

going to read a file so pass in r for

00:01:38

the second argument then it's good

00:01:40

practice at the end of your program to

00:01:42

close any open files

00:01:45

we will invoke the f close function pass

00:01:47

in our pointer do not dereference it and

00:01:50

we will need one more thing a buffer a

00:01:53

buffer is going to act as a container an

00:01:56

array of characters to hold one line of

00:01:58

our text document one line at a time so

00:02:01

let's declare an array of characters

00:02:03

named buffer and i'll set the size

00:02:06

to 255 our buffer is going to hold one

00:02:10

line of our file one line at a time and

00:02:12

to read a single line from our file we

00:02:15

will use the f gets function and there

00:02:18

are three arguments our buffer this is

00:02:21

what we're inserting a line of text into

00:02:24

a maximum input size i'll set this to be

00:02:26

255 to match our buffer and then a

00:02:29

pointer to the file that we're opening

00:02:32

and again make sure to not dereference

00:02:34

it so this will read a single line of

00:02:36

text and then let's print our buffer so

00:02:39

we're printing a string and we are

00:02:41

displaying whatever is currently within

00:02:43

our buffer

00:02:44

so after running this this will read a

00:02:46

single line of text whatever's at the

00:02:49

top roses are red

00:02:51

now if i need to read all of the

00:02:53

contents of my file i can place this

00:02:56

section of code within a while loop

00:03:01

so with our condition i'm going to move

00:03:04

the f gets function within the condition

00:03:07

if we reach the end of a file f gets

00:03:09

will return null so let's continue this

00:03:12

while loop while f gets does not return

00:03:15

no if we do not return null then we will

00:03:18

print whatever's within our buffer now

00:03:20

if i run this this will display all of

00:03:23

the lines from my file roses are red

00:03:26

violets are blue booty booty booty booty

00:03:28

rocking everywhere and if you would like

00:03:30

you can add a little bit of file

00:03:31

detection so before we reach our while

00:03:34

loop let's check to see if that file

00:03:36

even exists before we attempt to open

00:03:38

and read it so let's check to see if our

00:03:41

pointer equals no if it is null that

00:03:44

means we could not locate this file

00:03:46

so i'm going to print

00:03:49

unable to open

00:03:51

file

00:03:53

and we'll create an else statement

00:03:55

else let's read and print the contents

00:03:58

of this file

00:04:02

okay so let's say i get the file

00:04:03

extension wrong let's say i'm looking

00:04:05

for an html file named poem and i try

00:04:08

and read this

00:04:10

unable to open file but if we are able

00:04:12

to locate this file

00:04:14

we will open it and read the contents

00:04:17

and then close this file so yeah

00:04:19

everybody that is how to read the

00:04:21

contents of a file line by line if you

00:04:23

found this video helpful please be sure

00:04:25

to help me out by smashing that like

00:04:27

button leave a random comment down below

00:04:29

and subscribe if you'd like to become a

00:04:30

fellow bro

Description:

C read a file tutorial example explained int main() { FILE *pF = fopen("poem.txt", "r"); char buffer[255]; if(pF == NULL) { printf("Unable to open file!\n"); } else { while(fgets(buffer, 255, pF) != NULL) { printf("%s", buffer); } } fclose(pF); return 0; }

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