"Igal" <igal.alkon@[EMAIL PROTECTED]
> wrote in message
news:5392c5d0-dd97-484b-930a-4f34db38bc1a@[EMAIL PROTECTED]
> hay, i'm doing this program. having problem wiht realloc in the
> function that reads data structures into array (pointer - bp2), this
> happens after reading the second record. when call to realloc.
> i can't figure out what's wrong, think it's soming got to do with
> freeing bp2.
> and something called "corruption of the heap".
>
> book* LoadBookData(unsigned *size)
> {
> FILE* fp;
> int n = 0;
> book *bp2 = NULL;
>
> //open book data file
> fp=fopen("book.bin","rb");
> if (fp == NULL)
> {
> bp2 = (book*)calloc(0, sizeof(book));
> return bp2;
> }
> <<<<<<<<<<<<<<<HERE>>>>>>>>>>>>>>
> bp2 = realloc(bp2, sizeof(book));
> if (bp2 == NULL) { perror("ERROR [realloc - LoadBookData()]");
> exit(ERR_REALOC); }
>
> //read data from file
> while(fread(bp2,sizeof(book),1,fp) == 1)
> {
> if(ferror(fp)) { perror("ERROR [book.bin - read - LoadBookData()]");
> exit(ERR_FREAD); }
> bp2 = bp2 - n;
> n++;
>
> bp2 = realloc(bp2, sizeof(book));
> if (bp2 == NULL) { perror("ERROR [realloc - LoadBookData()]");
> exit(ERR_REALOC); }
>
> bp2 = bp2 + n;
> }
>
> //close book data file
> if (fclose(fp)==EOF)
> { perror("ERROR [book.bin - close - LoadBookData()]]");
> exit(ERR_FCLOSE); }
>
> *size = n;
>
> return bp2;
> }`
Say hey.
Jim
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