struct access violation

[iandobrien]

Hi,
just wondering if anyone might be able to help me out with this problem im having using structs in C++. I am trying to add a number to a 2D array that is a member of the struct but i am getting an "access violation" at runtime..Below is the code..thanks

typedef struct
{
unsigned int **red;

}rgbimage;

//and then i declare the struct..
rgbimage* image;

//and further down in my code

image->red[0][0] = 1;

 

[VincentP]

I see 2 errors in your code (well... 1, but you make it twice). Your pointers are uninitialized. When you declare "image", you should do:

rgbimage* image;

and then

// alocate the memory image will use (you can change the dimensions to suit your needs

image = new rbimage;
image->red = new int*[10];
for( i = 0; i < 10; i++ )
{
    image->red[i] = new int[10];
}

DO NOT FORGET TO USE delete AND delete[]! See threads
thread116-320826
and
Thread116-107726

for more info about multidimensionnal dynamic arrays.

Good luck!

Vincent