有几段代码看不懂,高手愿意解答一下吗?

[HWFDVD]

1, 以下请逐句解析
#define NT_SUCCESS(status) ((NTSTATUS)(status)>=0)
#define STATUS_INFO_LENGTH_MISMATCH ((NTSTATUS)0xC0000004L)

typedef LONG NTSTATUS

typedef ULONG (WINAPI *ZWQUERYSYSTEMINFORMATION)(ULONG, PVOID, ULONG, PULONG);

ZWQUERYSYSTEMINFORMATION ZwQuerySystemInformation = NULL;

2 这里ACCESS_MASK是什么类型?
typedef struct _SYSTEM_HANDLE_INFORMATION
{
ULONG ProcessId;
UCHAR ObjectTypeNumber;
UCHAR Flags;
USHORT Handle;
PVOID Object;
ACCESS_MASK GrantedAccess;
} SYSTEM_HANDLE_INFORMATION, *PSYSTEM_HANDLE_INFORMATION

[xjp6688]

ACCESS_MASK 应该是 DWORD 类型的

[heroboy2000]

#define NT_SUCCESS(status) ((NTSTATUS)(status)>=0)
#define STATUS_INFO_LENGTH_MISMATCH ((NTSTATUS)0xC0000004L)

typedef LONG NTSTATUS //定义NTSTATUS为LONG类型

typedef ULONG (WINAPI *ZWQUERYSYSTEMINFORMATION)(ULONG, PVOID, ULONG, PULONG);//定义函数指针类型

ZWQUERYSYSTEMINFORMATION ZwQuerySystemInformation = NULL;//声明一个函数指针，并初始化为NULL

ACCESS_MASK是什么类型，屈居于它的定义。

[dongpy]

VC里是这样定义的：

typedef DWORD ACCESS_MASK;

typedef unsigned long DWORD; //无符号整数

[kobefly]

typedef struct _SYSTEM_HANDLE_INFORMATION
{
ULONG ProcessId;
UCHAR ObjectTypeNumber;
UCHAR Flags;
USHORT Handle;
PVOID Object;
ACCESS_MASK GrantedAccess;
} SYSTEM_HANDLE_INFORMATION, *PSYSTEM_HANDLE_INFORMATION

typedef DWORD ACCESS_MASK;
所以ACCESS_MASK应该是双字类型，也就是32-bit unsigned integer.