Re: Getting length of array from C

[Jeffrey Carter <spam@spam.com>]

Chuck wrote:

> procedure Write_Array( my_array : in My_Array_Type );
> pragma Import( C, Write_Array, "c_write_array" );
> 
> The C function prototype from the header file I was given is:
> void c_write_array( void *array );

There isn't enough information here to know what c_write_array is doing 
with the array. You may have to look at the body to know how to use it.

> In the C code is there anyway I can get the length of the incoming
> array?  So, is Ada actually passing in a structure or an array?
> Hope this clears things up.

The only way for C to know the length is to pass it as a 2nd parameter. 
Ada will pass a convention-C pointer to the array's 1st element.

-- 
Jeff Carter
"You cheesy lot of second-hand electric donkey-bottom biters."
Monty Python & the Holy Grail
14