Thread: too many *'s

Originally Posted by chico1st

ok i just want to double check this

there is a function which reads out an array as

Code:

Func ((void **)&Array)

[/CODE]

This is wrong. You're passing the address of the temporary representing the pointer to the array, and passing it to Func.

You're also not following naming conventions.

A function that takes a void ** should take an array of void pointers as its argument.

When you have an & in the prototype, that means a reference. And you don't use typecasts in the prototype ((void **)). But references are C++. This is the C board. Are you sure you have the prototype of the function and the right board?

I think that's the call. Otherwise it might look like:

Code:

int Func (void *&Array)

>ok, if it's the call, then what's the prototype?
Actually you raise an interesting question, because the following isn't even a valid function declaration:

Code:

int otherFunc((void **)Array){

That what the original post looks like.

Can you post the correct (compilable without errors) prototype of Func() - perhaps you can dig out the header file that has the prototype and post the ACTUAL function prototype.

I wrote a bit of code like this:

Code:

int func(void **p);

int main()
{
   void *ptr;
   
   func(&ptr);
   return 0;
}

It compiles, but doesn't link since I don't have a "func" somewhere.

--
Mats

Code:

Int32 func(void** Array);

if you were to be passing the value for ptr into main what would it look like?

Code:

int func(void **p);

int main(*ptr)
{ 
   func(ptr);
   return 0;
}

OR

Code:

int func(void *p);

int main(*ptr)
{ 
   func(&ptr);
   return 0;
}

>Int32 func(void** Array);
How is the array you want to pass to this function declared? Is it:

Code:

int *num_array;

Or:

Code:

int **num_array;

Or:

Code:

int num_array[10];

Or:

Code:

int *num_array[10];

Or is it actually a void **:

Code:

void **array;

Or something else?

Yes, one of those is right - it depends A LOT on what the function actually expects. It is impossible to say from just seeing the prototype of a function whether it expects the address of a void pointer [and whether it should be a void pointer that points to some valid memory, or if the function just sets the pointer to something within the function], or it expects the address of (for example) an array.

Without either source of func, or the documentation of func, it's not possible for us to say what it does.

--
Mats