Thread: "Invalid chars", when I try to create a text file

Hello guys, how are you?

I'm trying to generate a text file using the commands fread and fwrite, but when I open the text file that I'm generating it has a lot of weird letters, and a warning: "Your file has invalid chars"

I have a struct, I read data into it, and then I put it data on a bin file. (I'm able to read the bin file, and show it to the user without any errors),

Then I try to put these data into a text file, and then when i try to open the text file, it fails...

I've already made a lot of others programs that works with FILE commands, so, in your experience, what that might be?

Thanks in advance,

It's probably acting correctly.
fwrite and fread write unformatted (so-called "binary") data to the file. So if n is an integer and you do this

Code:

fwrite(&n, sizeof n, 1, fp);

Then the actual bytes of the integer are written to the file, not the ascii characters that make up the "human-readable" form.

but.... what could I do then?

What could I do to create a text readable form file if I have already read a bin file?

I have a file.bin, and I can read it on the terminal, but if I try to put that data on a file.txt file, when I try to open this file, it shows a weird output

Thanks for the help

Originally Posted by frank1

What could I do to create a text readable form file if I have already read a bin file?
I have a file.bin, and I can read it on the terminal, but if I try to put that data on a file.txt file, when I try to open this file, it shows a weird output

Pretend that I don't have psychic powers for the moment and ask your question again.

Where did file.bin come from?

Do you know it's binary structure?

What exactly are you trying to do?

You are not writing the struct correctly. Rather, you are just writing it as if you wanted to write to a binary file, but you stated that you want it to be a human readable text file. Therefore, you need to come up with a suitable file format, then write it to file using that format, e.g.,

Code:

while (fread(&myStruct, sizeof(typeMyStruct), 1, fp) != 0) {
    fprintf(fp2, "%d %d\n", myStruct->x, myStruct->y);
}

(Of course, I'm making up the format and even your struct's members for my example.)