C++ Code Error?

[Adam Shapiro]

I'm trying to use memcpy to set a vertex buffer for Direct3D but when I send the vertex array, it shuts the program. The memcpy definition asks for a const void * but I am using code that has worked on different machines with a normal void *. I have even gotten it to work before but I just added something that changes the verticies after they have been declared and now it won't work...

Sample code:
struct D3DVERTEX
{
float x,y,z,nx,ny,nz;
};
VOID *pVertex;
D3DVERTEX cvVertex[]={{1,2,3,0.0f,0.0f,0.0f,},};
cvVertex.nx=5.0;
memcpy(pVertex,cvVertex,sizeof(cvVertex));
-->CRASH!!!

I have had the same problem when sending a dynamic string to MessageBox... I think it is a problem with sending dynamic to static but other people have gotten it to work!! Any suggestions?