Simple pointer problem

Thanks, but I don't want to create a new array.

What I want is the following:

When I change the value of pixels, the value of the memory
which is associated with bits needs to be changed, too.

So pixels is a pointer on the bits pointer, but how do I
convert it from void to BYTE?

Edited by - LaBasX2 on September 9, 2000 7:21:55 PM

Why have you declared the bits variable as void?

I am guessing so you could try and use either byte or word size pointers.

I dont think you will be able to access an array of ''void'' data elements using a pointer like that.

You might wanna consider have like this:

BYTE *bits;

BYTE *pixels;

after the bits pointer points to a valid chunk of BYTE data, you should be able to use pixels[0] etc to access the memory space of each BYTE. I think to change a value at a position you could use

pixels = &(bits[0]);
*pixels = 255;

In this way, if you needed to step through the bits array using the pixels pointer, you could just iterate the line

pixels++;

this will advance the pointer by sizeof(BYTE), because that is the data type of the pointer.

This is from memory so I could be a bit off track.

Cel

Oops, typo there

''you should be able to use pixels[0] etc to access the memory''

I meant bits[0] etc

Cel

Thanks for your reply.

I want to use ''CreateDIBSection'' and this routine needs a void
pointer. Now I want to access this DIB and somehow I need a
BYTE-pointer, or don''t I need one? I don''t know, I''m new to VC!