typedef struct _PROCESS_HEAP_ENTRY {
    PVOID lpData;
    DWORD cbData;
    BYTE cbOverhead;
    BYTE iRegionIndex;
    WORD wFlags;
    union {
        struct {
            HANDLE hMem;
            DWORD dwReserved[ 3 ];
        } Block;
        struct {
            DWORD dwCommittedSize;
            DWORD dwUnCommittedSize;
            LPVOID lpFirstBlock;
            LPVOID lpLastBlock;
        } Region;
    };
} PROCESS_HEAP_ENTRY, *LPPROCESS_HEAP_ENTRY, *PPROCESS_HEAP_ENTRY;