It is only a pointer, don't worry. It's a pointer that points to pointers.

The struct declaration indeed only reserves one pointer, not an array or anything.

However, I guess you want to have...

By the way blrjohn, you could also try and fire up a console and execute your program from there. It won't disappear then. I dunno on which OS you are, but guessing it's Windows (80% market share or...

That's a C++ program btw, not C.

To make it C:

#define _WIN32_WINNT 0x0500

#include <windows.h>
#include <stdio.h>
#include <math.h>

Not to be an ******* but poster says he wants to capture and store image data from a webcam. That's pretty specific, not?