b开头代表BOOL， sz代表string zero(以0结尾的子串)
typedef unsigned long DWORD 4字节
typedef int BOOL 4字节
typedef unsigned char BYTE 1字节
typedef unsigned short WORD 2字节
typedef float FLOAT
typedef void far *LPVOID
typedef int INT 4字节
typedef unsigned int UINT 2字节
#define WINAPI _stdcall
