用creatfilemapping共享内存，两进程却没有指向同一块内存，这是咋回事呀

用creatfilemapping共享内存，两进程却没有指向同一块内存，这是怎么回事呀？
我在driver里面用creatfilemapping开辟了一块内存和应用层共享，结果两进程却没有指向同一块地址，相关代码如下，请高手指点，谢谢！
底层driver的代码：
pDevCtxt->hMapFile=CreateFileMapping(
INVALID_HANDLE_VALUE,
NULL,
PAGE_READWRITE,
0,
cbSize,
TEXT("Mediacore")
);

if(NULL != pDevCtxt->hMapFile)
{
pDevCtxt->lpMapBuffer =(LPVOID)MapViewOfFile(pDevCtxt->hMapFile, FILE_MAP_ALL_ACCESS, 0, 0, cbSize);
if(!pDevCtxt->lpMapBuffer)
{
printf("MapViewOfFile failed:%x\n",GetLastError());
return 0;
}

}else
{
printf("CreateFileMapping failed:%x\n",GetLastError());
return 0;
}
 
  DWORD dwSrc = 0;
  DWORD dwFlag = 0;
  if(bPhysical)
  {
  dwSrc = ((DWORD)lpSrc)>>8;
  dwFlag = PAGE_READWRITE|PAGE_PHYSICAL|PAGE_NOCACHE;
  }
  else
  {
  dwSrc = ((DWORD)lpSrc);
  dwFlag = PAGE_READWRITE|PAGE_NOCACHE;
  }

  if(VirtualCopy(pDevCtxt->lpMapBuffer,(LPVOID)dwSrc, cbSize, dwFlag))
  return pDevCtxt->lpMapBuffer;
上层的代码：
hMapFile=CreateFileMapping(
INVALID_HANDLE_VALUE,
NULL,
PAGE_READWRITE|SEC_COMMIT,
0,
10*1024*1024,
TEXT("Mediacore")
);
DWORD dwLast=GetLastError();

if(NULL != hMapFile)
{
lpMapBuffer =(LPVOID)MapViewOfFile(hMapFile, FILE_MAP_ALL_ACCESS, 0, 0, 10*1024*1024);
if(!lpMapBuffer)
{
printf("MapViewOfFile failed:%x\n",GetLastError());
return FALSE;
}

}else
{
printf("CreateFileMapping failed:%x\n",GetLastError());
return FALSE;
}
 

------解决方案--------------------------------------------------------
用全路径文件名试试