Writing a structure to file?
Is it possible to save an entire structure at a time to a file? In the code I’ve attached I am saving the pointer, but not the information stored, how can I do it?
void filesave(void)
{
FILE *fpout;
out=first;
if(out==(struct account *)NULL)
{
puts("There are no records to Save!");
system("pause");
}
else
{
if ((fpout = fopen("test.txt","w")) == NULL)
fprintf (fpout,"%s\n", out);
}
puts("Files Copied!");
system("pause");
fclose(fpout);
}
Depends on the structure. ALthough in general, the following call MIGHT work....
fwrite (out, sizeof (struct account), 1, fpout);
I repeat, it MIGHT work. You would read the structure from the file using an fread() call with the same parameters.
Callou collei we'll code the way
Of prime numbers and pings!
> Is it possible to save an entire structure at a time to a file?
Yes, providing the structure does not contain any pointers
You should always use binary mode ("rb","wb") when you're using the fread/fwrite functions.Code:struct foo bar[10]; FILE *fp = fopen( "file.dat", "wb" ); fwrite( bar, sizeof(struct foo), 10, fp ); fclose( fp );
