If you want to store the data to a variable and then do some work on the data, how do you do that? for example, your file might look like this: 36 1 75 60 37 22 46 79 100 88 24 38 75 58 23 99 14 8 65 88 50 38 2 64 81 57 14 32 46 93 68 73 8 66 97 44 Now I might want to read this data line by line and number by number so that I have: A=36 B=1 C= 75 D= 60 E= 37 F=22 Now do something with the numbers and then move to the next line and so on until I reach the EOF. Now how can I do this in C? In C# it is pretty easy because it has functions/Methods to do these things but in C it looks quite difficult. However, with your expertise you can tell us how this done. Please write a blog or create a short video so that we can follow it. Thanks for these very helpful videos. Kind regards,
Can you help me with this please: Write a program that describes the work of a buffer between two processes ,one writes in the buffer and other one reads from the buffer. Buffer size is fixed and must not be passed
No, encapsulation has to do with the architecture of the software (many individual variables combined create a single data type) whereas serailization is just a process. Basically, in C, this would be the creating of structs that make up some more complex entities from primitive types. This is regardless of how you load/save the data from/to disk.
Got it, thank you so much! Very informative, I’ve watched most of your videos and they are packed with quality information in such a short time. Thank you so much! Excited to get better
if (fgets(buffer_in, 256, in) == NULL) { fclose(in); return 1; } fclose(in); Basically it's not closing the file twice, it's only closing once and only after it's done reading. One of them is in the if statement because, if fgets returns NULL that means an error occurred and as you can see, I am returning out of the main function there. Therefore I have to close the file beforehand. If that if is not executed then we also need to close the file since we don't need it anymore because we're done reading already. It could be done better. Maybe you can rewriting this piece of code so that fclose appears only once in there. Could be a good exercise ;)
@@CodeVault what if the file name will be entered from the keyboard (the number of symbols in the file name is undefined)? Is it possible to avoid compiler warning C6054? (Code works fine)
Man i've been seeing your videos from like 5th semester, did a project because of u :) and still watchin !!!
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If you want to store the data to a variable and then do some work on the data, how do you do that? for example, your file might look like this:
36 1 75 60 37 22
46 79 100 88 24 38
75 58 23 99 14 8
65 88 50 38 2 64
81 57 14 32 46 93
68 73 8 66 97 44
Now I might want to read this data line by line and number by number so that I have:
A=36
B=1
C= 75
D= 60
E= 37
F=22
Now do something with the numbers and then move to the next line and so on until I reach the EOF.
Now how can I do this in C? In C# it is pretty easy because it has functions/Methods to do these things but in C it looks quite difficult. However, with your expertise you can tell us how this done.
Please write a blog or create a short video so that we can follow it.
Thanks for these very helpful videos.
Kind regards,
Alright, I'll make a short video explaining this
@@CodeVault OK thank you very much indeed.
It might be a REAL GOOD IDEA to post the code
Here you go: code-vault.net/lesson/pt6uwax8pw:1603733523045
Thank you. This video helped me
Can you help me with this please:
Write a program that describes the work of a buffer between two processes ,one writes in the buffer and other one reads from the buffer. Buffer size is fixed and must not be passed
Ask on our discord server: discord.code-vault.net
Great tutorial! is serialization and the process of bringing in data the same as encapsualtion?
No, encapsulation has to do with the architecture of the software (many individual variables combined create a single data type) whereas serailization is just a process. Basically, in C, this would be the creating of structs that make up some more complex entities from primitive types.
This is regardless of how you load/save the data from/to disk.
Got it, thank you so much! Very informative, I’ve watched most of your videos and they are packed with quality information in such a short time. Thank you so much! Excited to get better
I always get segmentation fault and returns 1 when you check if(in == NULL). What should I do?
Send in the whole code, a simple check for NULL can't give you seg fault
Is there a way to read just one line from a file without using fgets?
You could just read character by character with fgetc until you find a
why do you have fclose twice? one within the if statement and once just after? if the file is closed then how does it read from it? Thanks
if (fgets(buffer_in, 256, in) == NULL) {
fclose(in);
return 1;
}
fclose(in);
Basically it's not closing the file twice, it's only closing once and only after it's done reading. One of them is in the if statement because, if fgets returns NULL that means an error occurred and as you can see, I am returning out of the main function there. Therefore I have to close the file beforehand. If that if is not executed then we also need to close the file since we don't need it anymore because we're done reading already.
It could be done better. Maybe you can rewriting this piece of code so that fclose appears only once in there. Could be a good exercise ;)
THankksssss :D
Tqu
is it possible to pass a variable with the name of the file to the function fopen_s as the second parameter? If so, how to do it?
Yeah, of course it is:
FILE* out;
const char* filename = "my_text_file.txt";
fopen_s(&out, filename, "r");
@@CodeVault what if the file name will be entered from the keyboard (the number of symbols in the file name is undefined)? Is it possible to avoid compiler warning C6054? (Code works fine)
Just make sure your string is NULL-terminated and you shouldn't get that warning
How do you choose which line you want to read at ?
You can't, unless you know the number of characters per line and fseek that number of characters.
@@CodeVault I found a way in the end by saving all the lines one by one and not looking for a specific one but thx
Can u please do the same video but using functions
Using functions? Hmm, I'll look into it
excel files pls?
You could export an excel file to CSV format, then it's easy to read in C
@@CodeVault what do I have to do to read a csv? "fopen "csv"?
No. Just like in the video but change the format string to be a CSV string
@@CodeVault so the code to open would be in what style? Could you write here?