#include <stdio.h>
#include <windows.h>
void main()
{
HGLOBAL hGlobal = GlobalAlloc(GMEM_FIXED, 1024*1024*1024);
LPBYTE pData = (LPBYTE)GlobalLock(hGlobal);
memset(pData,(char)0xff,1024*1024*1024);
system("pause");
GlobalUnlock(hGlobal);
GlobalFree(hGlobal);
}