Reading from a file all elements within it in C - c

Question

So I need to write a function that reads all the elements inside a bit file. The point is that I don't know how many elements there could be inside, but I know what type of elements are. So I tried to write this function:
void loadData(Parallelogram **array) {
FILE *data; long size;
//int numberOfElements = 0;
int numberOfObjects = 0;
if ((data = fopen(name, "rb"))!=NULL) {
fseek(data, 0, SEEK_END);
size = ftell(data);
fseek(data, 0, SEEK_SET);
if (size<(long)sizeof(Parallelogram)) {
printf("The file is empty try to open another file maybe");
} else {
Parallelogram *tempArray;
numberOfObjects = size/sizeof(Parallelogram);
tempArray = realloc(*array, numberOfObjects*sizeof(Parallelogram));
if (tempArray==NULL) {
printf("There was an error reallocating memory");
} else { *array = tempArray; }
fread(*array, sizeof(Parallelogram), numberOfObjects, data);
}
}
fclose(data);
}
The elements are struct objects of type Parallelogram, storing a few floats.
The commented out part was me trying another method form another question but not understanding the real mechanism. Anyways when I call the function the array is empty. What am I getting wrong?
EDIT: As requested this is the main function where I call the function loadData()
int main() {
Parallelogram *paraArray = NULL;
loadData(&paraArray);
}

Answer 1

EDIT: complete function more or less like the OP's.
You may do something like:
void loadData(Parallelogram **array, size_t * n) {
FILE *data;
if ((data = fopen("file.bin", "rb"))!=NULL) {
Parallelogram buffer[100]; // may be malloc'd
size_t chunk_size = 100;
size_t read_size = 0;
size_t number_of_objects = 0;
Parallelogram *aux = NULL;
*array = NULL;
while ((read_size = fread(buffer, sizeof *buffer, chunk_size, data)) > 0) {
aux = realloc(*array, (number_of_objects + read_size) * sizeof *buffer);
if (aux == NULL) {
// ERROR
free(*array);
// clean, break/exit
}
*array = aux;
memcpy(*array + number_of_objects, buffer, read_size*sizeof *buffer);
number_of_objects += read_size;
}
// check file for errors (ferror()) before exit
fclose(data);
*n = number_of_objects;
}
}