load a class problem

well im am trying to load a class, it does compile,but doesnt work :(
here's my code:

Code:

---


//prototype
void loadS(Student(*)[10]);

class Student
{
  ...  //some stuff, also void display()
}

// in "int main()"
Student student[10]; 
loadS(student&);  // loading it


void loadS(Student* loading[])
{
       
        ifstream load; 
        load.open("Data.dat",ios::out | ios::binary); 
                // theres some data in Data.dat
        load.read((char*)&loading, sizeof(Student));
        load.close();
       
                loading[0]->display();  //just a display test
        loading[1]->display();
                return;
}
  //info in data.dat should be in "student" now

---

It is supposed to load the class with 10 objects, wich is in data.dat, in (Student)student.


this is the error:
Make.obj : error LNK2001: unresolved external symbol "void __cdecl load(class Student (*)[10])" (?loadS@@YAXPAY09VStudent@@@Z)

Use a single pointer to pass an array to a function (this is one way):

Code:

---

void foo(int *array, int length)
{
  array[0] ...
  array[1] ...
  ...
  array[length - 1] ...
}
...
int n[10];
foo(n,10);

---

gg

:confused: :confused: :confused: :confused:
uuuh... and then?

As mentioned, pass the array of students as a single pointer, not a double pointer. An array is basically a pointer.
You say it compiles? Well, this doesn't look right to me:
loadS(student&);

You mean
loadS(&student);
???

If you switch to a single pointer, leave the & out.

Also, if you want to read 10 students, either make a loop or read 10 times the data (see below).

Finally, make sure the open() succeeds before attempting a read. This can be done using load.fail().

Code:

---

//prototype
void loadS(Student(*)[10]);

class Student
{
  ...  //some stuff, also void display()
}

// in "int main()"
Student student[10]; 
loadS(student);  // loading it


void loadS(Student* loading)
{
       
        ifstream load; 
        load.open("Data.dat",ios:ut | ios::binary); 

        if(load.fail()) return;

                // theres some data in Data.dat
        load.read((char*)&loading, 10 * sizeof(Student));
        load.close();
}
  //info in data.dat should be in "student" now

---

Remove this "&" as well:

Code:

---

load.read((char*)&loading, 10 * sizeof(Student));

---

gg

hmm, still getting the error messagges.. is it because I use static integers in my class? (I have initialized them though)

This is wrong:

Code:

---

void loadS(Student(*)[10]);

---

Get rid of it completely or use the correct prototype. (See post by Magos)

Then go back and review pointers in your C/C++ book.

gg

NOTICE! You need a semicolon to end the class.

Code:

---

//...

class Student
{
  ...  //some stuff, also void display()
};  // <<<<<<<<< SEMICOLON!!!!!!

//...

---