using fwrite() to write a struct to a file Error 688

Question

error: incompatible type for argument 1 of ‘fwrite’ /usr/include/stdio.h:688: note: expected ‘const void * restrict’ but argument is of type ‘struct oseba’ make: *** [E1041080] Error 1

struct oseba{
char baza[100];
int telefonska;
char ime[10];
char priimek[20];
int dan;
int mesec;
int leto;

};

boys i need help! what is wrong?

---------------------------write-----------------------

FILE*file=fopen("fhfh.dat","wb");
if(file!=NULL)
{   fwrite(oseba1,sizeof(struct oseba),1,file);
    fclose(file);
}

Antti Haapala · Accepted Answer · 2016-03-10 20:18:37Z

6

You need to pass a pointer to the structure. That is,

fwrite(&oseba1, sizeof(struct oseba), 1, file);

However beware that by writing structs into a binary file, it is highly probable that the file thus saved will not be portable, e.g. you cannot share it even between 32-bit and 64-bit compilations of your program or from platform to another.

edited Mar 10, 2016 at 20:18

answered Mar 10, 2016 at 19:56

Antti Haapala

135k23 gold badges297 silver badges349 bronze badges

Sign up to request clarification or add additional context in comments.

3 Comments

Stack Exchange Broke The Law Over a year ago

The last sentence is irrelevant to the question and would be better as a comment.

PM 2Ring Over a year ago

@immibis: That last sentence is clearly separated from the main body of the answer by a <hr>. It's an important caveat that anyone attempting to read & write structs to a file should be aware of. So it deserves to be in the answer, not in a comment, since comments are "second-class citizens" on Stack Exchange site.

Antti Haapala Over a year ago

Well, it wasn't that much separated when immibis wrote that comment :D

Collectives™ on Stack Overflow

using fwrite() to write a struct to a file Error 688

1 Answer 1

3 Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

3 Comments

Your Answer

Sign up or log in

Post as a guest

Related