Question

Is there a better way? Please note that I’m not using fixed because I need to scan through the buffer data.

GCHandle pinned1 = GCHandle.Alloc(Pic1, GCHandleType.Pinned);
IntPtr ptr1 = pinned1.AddrOfPinnedObject();
byte* p1 = (byte*)ptr1.ToPointer();
//...
//...
//...
byte a=*p1;
p1++;
//...
//...
pinned1.Free();

Answer 1

Yes, there is a better way: use fixed.

You can simply assign the pointer to another variable and perform pointer arithmetic on that:

fixed (byte* ptr = pic1)
{
    byte* p1 = ptr;

    //...
    byte a = *p1;
    p1++;
    //...
}