Windows Data Types

The data types supported by Microsoft® Windows® are used to define function return values, function and message parameters, and structure members. They define the size and meaning of these elements. For more information about the underlying C/C++ data types, see Data Type Ranges.

The following table contains the following types: character, integer, Boolean, pointer, and handle. The character, integer, and Boolean types are common to most C compilers. Most of the pointer-type names begin with a prefix of P or LP. Handles refer to a resource that has been loaded into memory.

For more information about handling 64-bit integers, see Large Integers.

 

Type Description
ATOM

Atom. For more information, see Atoms.

This type is declared in WinDef.h as follows:

 

typedef WORD ATOM;
BOOL

Boolean variable (should be TRUE or FALSE).

This type is declared in WinDef.h as follows:

 

typedef int BOOL;
BOOLEAN

Boolean variable (should be TRUE or FALSE).

This type is declared in WinNT.h as follows:

 

typedef BYTE BOOLEAN;
BYTE

Byte (8 bits).

This type is declared in WinDef.h as follows:

 

typedef unsigned char BYTE;
CALLBACK

Calling convention for callback functions.

This type is declared in WinDef.h as follows:

 

#define CALLBACK __stdcall
CHAR

8-bit Windows (ANSI) character. For more information, see Character Sets Used By Fonts.

This type is declared in WinNT.h as follows:

 

typedef char CHAR;
COLORREF

Red, green, blue (RGB) color value (32 bits). See COLORREF for information on this type.

This type is declared in WinDef.h as follows:

 

typedef DWORD COLORREF;
CONST

Variable whose value is to remain constant during execution.

This type is declared in WinDef.h as follows:

 

#define CONST const
DWORD

32-bit unsigned integer.

This type is declared in WinDef.h as follows:

 

typedef unsigned long DWORD;
DWORDLONG

64-bit unsigned integer.

This type is declared in WinNT.h as follows:

 

typedef ULONGLONG DWORDLONG;
DWORD_PTR

Unsigned long type for pointer precision. Use when casting a pointer to a long type to perform pointer arithmetic. (Also commonly used for general 32-bit parameters that have been extended to 64 bits in 64-bit Windows. )

This type is declared in BaseTsd.h as follows:

 

typedef ULONG_PTR DWORD_PTR;
DWORD32

32-bit unsigned integer.

This type is declared in BaseTsd.h as follows:

 

typedef unsigned int DWORD32;
DWORD64

64-bit unsigned integer.

This type is declared in BaseTsd.h as follows:

 

typedef unsigned __int64 DWORD64;
FLOAT

Floating-point variable.

This type is declared in WinDef.h as follows:

 

typedef float FLOAT;
HACCEL

Handle to an accelerator table.

This type is declared in WinDef.h as follows:

 

typedef HANDLE HACCEL;
HALF_PTR

Half the size of a pointer. Use within a structure that contains a pointer and two small fields.

This type is declared in Basetsd.h as follows:

 

#ifdef _WIN64
 typedef int HALF_PTR;
#else
 typedef short HALF_PTR;
#endif
HANDLE

Handle to an object.

This type is declared in WinNT.h as follows:

 

typedef PVOID HANDLE;
HBITMAP

Handle to a bitmap.

This type is declared in WinDef.h as follows:

 

typedef HANDLE HBITMAP;
HBRUSH

Handle to a brush.

This type is declared in WinDef.h as follows:

 

typedef HANDLE HBRUSH;
HCOLORSPACE

Handle to a color space.

This type is declared in WinDef.h as follows:

 

#if(WINVER >= 0x0400)
 typedef HANDLE HCOLORSPACE;
#endif
HCONV

Handle to a dynamic data exchange (DDE) conversation.

This type is declared in Ddeml.h as follows:

 

typedef HANDLE HCONV;
HCONVLIST

Handle to a DDE conversation list.

This type is declared in Ddeml.h as follows:

 

typedef HANDLE HCONVLIST;
HCURSOR

Handle to a cursor.

This type is declared in WinDef.h as follows:

 

typedef HICON HCURSOR;
HDC

Handle to a device context (DC).

This type is declared in WinDef.h as follows:

 

typedef HANDLE HDC;
HDDEDATA

Handle to DDE data.

This type is declared in Ddeml.h as follows:

 

typedef HANDLE HDDEDATA;
HDESK

Handle to a desktop.

This type is declared in WinDef.h as follows:

 

typedef HANDLE HDESK;
HDROP

Handle to an internal drop structure.

This type is declared in ShellApi.h as follows:

 

typedef HANDLE HDROP;
HDWP

Handle to a deferred window position structure.

This type is declared in WinUser.h as follows:

 

typedef HANDLE HDWP;
HENHMETAFILE

Handle to an enhanced metafile.

This type is declared in WinDef.h as follows:

 

typedef HANDLE HENHMETAFILE;
HFILE

Handle to a file opened by OpenFile, not CreateFile.

This type is declared in WinDef.h as follows:

 

typedef int HFILE;
HFONT

Handle to a font.

This type is declared in WinDef.h as follows:

 

typedef HANDLE HFONT;
HGDIOBJ

Handle to a GDI object.

This type is declared in WinDef.h as follows:

 

typedef HANDLE HGDIOBJ;
HGLOBAL

Handle to a global memory block.

This type is declared in WinDef.h as follows:

 

typedef HANDLE HGLOBAL;
HHOOK

Handle to a hook.

This type is declared in WinDef.h as follows:

 

typedef HANDLE HHOOK;
HICON

Handle to an icon.

This type is declared in WinDef.h as follows:

 

typedef HANDLE HICON;
HINSTANCE

Handle to an instance.

This type is declared in WinDef.h as follows:

 

typedef HANDLE HINSTANCE;
HKEY

Handle to a registry key.

This type is declared in WinDef.h as follows:

 

typedef HANDLE HKEY;
HKL

Input locale identifier.

This type is declared in WinDef.h as follows:

 

typedef HANDLE HKL;
HLOCAL

Handle to a local memory block.

This type is declared in WinDef.h as follows:

 

typedef HANDLE HLOCAL;
HMENU

Handle to a menu.

This type is declared in WinDef.h as follows:

 

typedef HANDLE HMENU;
HMETAFILE

Handle to a metafile.

This type is declared in WinDef.h as follows:

 

typedef HANDLE HMETAFILE;
HMODULE

Handle to a module. The value is the base address of the module.

This type is declared in WinDef.h as follows:

 

typedef HINSTANCE HMODULE;
HMONITOR

Handle to a display monitor.

This type is declared in WinDef.h as follows:

 

if(WINVER >= 0x0500) typedef HANDLE HMONITOR;
HPALETTE

Handle to a palette.

This type is declared in WinDef.h as follows:

 

typedef HANDLE HPALETTE;
HPEN

Handle to a pen.

This type is declared in WinDef.h as follows:

 

typedef HANDLE HPEN;
HRESULT

Return code used by interfaces. It is zero upon success and nonzero to represent an error code or status information.

This type is declared in WinNT.h as follows:

 

typedef LONG HRESULT;
HRGN

Handle to a region.

This type is declared in WinDef.h as follows:

 

typedef HANDLE HRGN;
HRSRC

Handle to a resource.

This type is declared in WinDef.h as follows:

 

typedef HANDLE HRSRC;
HSZ

Handle to a DDE string.

This type is declared in Ddeml.h as follows:

 

typedef HANDLE HSZ;
HWINSTA

Handle to a window station.

This type is declared in WinDef.h as follows:

 

typedef HANDLE WINSTA;
HWND

Handle to a window.

This type is declared in WinDef.h as follows:

 

typedef HANDLE HWND;
INT

32-bit signed integer.

This type is declared in WinDef.h as follows:

 

typedef int INT;
INT_PTR

Signed integer type for pointer precision. Use when casting a pointer to an integer to perform pointer arithmetic.

This type is declared in BaseTsd.h as follows:

 

#if defined(_WIN64) 
 typedef __int64 INT_PTR; 
#else 
 typedef int INT_PTR;
#endif
INT32

32-bit signed integer.

This type is declared in BaseTsd.h as follows:

 

typedef signed int INT32;
INT64

64-bit signed integer.

This type is declared in BaseTsd.h as follows:

 

typedef signed __int64 INT64;
LANGID

Language identifier. For more information, see Locales.

This type is declared in WinNT.h as follows:

 

typedef WORD LANGID;
LCID

Locale identifier. For more information, see Locales.

This type is declared in WinNT.h as follows:

 

typedef DWORD LCID;
LCTYPE

Locale information type. For a list, see LCTYPE Constants.

This type is declared in WinNls.h as follows:

 

typedef DWORD LCTYPE;
LGRPID

Language group identifier. For a list, see EnumLanguageGroupLocales.

This type is declared in WinNls.h as follows:

 

typedef DWORD LGRPID;
LONG

32-bit signed integer.

This type is declared in WinNT.h as follows:

 

typedef long LONG;
LONGLONG

64-bit signed integer.

This type is declared in WinNT.h as follows:

 

#if !defined(_M_IX86)
 typedef __int64 LONGLONG; 
#else
 typedef double LONGLONG;
#endif
LONG_PTR

Signed long type for pointer precision. Use when casting a pointer to a long to perform pointer arithmetic.

This type is declared in BaseTsd.h as follows:

 

#if defined(_WIN64)
 typedef __int64 LONG_PTR; 
#else
 typedef long LONG_PTR;
#endif
LONG32

32-bit signed integer.

This type is declared in BaseTsd.h as follows:

 

typedef signed int LONG32;
LONG64

64-bit signed integer.

This type is declared in BaseTsd.h as follows:

 

typedef __int64 LONG64;
LPARAM

Message parameter.

This type is declared in WinDef.h as follows:

 

typedef LONG_PTR LPARAM;
LPBOOL

Pointer to a BOOL.

This type is declared in WinDef.h as follows:

 

typedef BOOL far *LPBOOL;
LPBYTE

Pointer to a BYTE.

This type is declared in WinDef.h as follows:

 

typedef BYTE far *LPBYTE;
LPCOLORREF

Pointer to a COLORREF value.

This type is declared in WinDef.h as follows:

 

typedef DWORD *LPCOLORREF;
LPCSTR

Pointer to a constant null-terminated string of 8-bit Windows (ANSI) characters. For more information, see Character Sets Used By Fonts.

This type is declared in WinNT.h as follows:

 

typedef __nullterminated CONST CHAR *LPCSTR;
LPCTSTR

An LPCWSTR if UNICODE is defined, an LPCSTR otherwise.

This type is declared in WinNT.h as follows:

 

#ifdef UNICODE
 typedef LPCWSTR LPCTSTR; 
#else
 typedef LPCSTR LPCTSTR;
#endif
LPCVOID

Pointer to a constant of any type.

This type is declared in WinDef.h as follows:

 

typedef CONST void *LPCVOID;
LPCWSTR

Pointer to a constant null-terminated string of 16-bit Unicode characters. For more information, see Character Sets Used By Fonts.

This type is declared in WinNT.h as follows:

 

typedef CONST WCHAR *LPCWSTR;
LPDWORD

Pointer to a DWORD.

This type is declared in WinDef.h as follows:

 

typedef DWORD *LPDWORD;
LPHANDLE

Pointer to a HANDLE.

This type is declared in WinDef.h as follows:

 

typedef HANDLE *LPHANDLE;
LPINT

Pointer to an INT.

This type is declared in WinDef.h as follows:

 

typedef int *LPINT;
LPLONG

Pointer to a LONG.

This type is declared in WinDef.h as follows:

 

typedef long *LPLONG;
LPSTR

Pointer to a null-terminated string of 8-bit Windows (ANSI) characters. For more information, see Character Sets Used By Fonts.

This type is declared in WinNT.h as follows:

 

typedef CHAR *LPSTR;
LPTSTR

An LPWSTR if UNICODE is defined, an LPSTR otherwise.

This type is declared in WinNT.h as follows:

 

#ifdef UNICODE
 typedef LPWSTR LPTSTR;
#else
 typedef LPSTR LPTSTR;
#endif
LPVOID

Pointer to any type.

This type is declared in WinDef.h as follows:

 

typedef void *LPVOID;
LPWORD

Pointer to a WORD.

This type is declared in WinDef.h as follows:

 

typedef WORD *LPWORD;
LPWSTR

Pointer to a null-terminated string of 16-bit Unicode characters. For more information, see Character Sets Used By Fonts.

This type is declared in WinNT.h as follows:

 

typedef WCHAR *LPWSTR;
LRESULT

Signed result of message processing.

This type is declared in WinDef.h as follows:

 

typedef LONG_PTR LRESULT;
PBOOL

Pointer to a BOOL.

This type is declared in WinDef.h as follows:

 

typedef BOOL *PBOOL;
PBOOLEAN

Pointer to a BOOL.

This type is declared in WinNT.h as follows:

 

typedef BOOLEAN *PBOOLEAN;
PBYTE

Pointer to a BYTE.

This type is declared in WinDef.h as follows:

 

typedef BYTE *PBYTE;
PCHAR

Pointer to a CHAR.

This type is declared in WinNT.h as follows:

 

typedef CHAR *PCHAR;
PCSTR

Pointer to a constant null-terminated string of 8-bit Windows (ANSI) characters. For more information, see Character Sets Used By Fonts.

This type is declared in WinNT.h as follows:

 

typedef CONST CHAR *PCSTR;
PCTSTR

A PCWSTR if UNICODE is defined, a PCSTR otherwise.

This type is declared in WinNT.h as follows:

 

#ifdef UNICODE
 typedef LPCWSTR PCTSTR;
#else
 typedef LPCSTR PCTSTR;
#endif
PCWSTR

Pointer to a constant null-terminated string of 16-bit Unicode characters. For more information, see Character Sets Used By Fonts.

This type is declared in WinNT.h as follows:

 

typedef CONST WCHAR *PCWSTR;
PDWORD

Pointer to a DWORD.

This type is declared in WinDef.h as follows:

 

typedef DWORD *PDWORD;
PDWORDLONG

Pointer to a DWORDLONG.

This type is declared in WinNT.h as follows:

 

typedef DWORDLONG *PDWORDLONG;
PDWORD_PTR

Pointer to a DWORD_PTR.

This type is declared in BaseTsd.h as follows:

 

typedef DWORD_PTR *PDWORD_PTR;
PDWORD32

Pointer to a DWORD32.

This type is declared in BaseTsd.h as follows:

 

typedef DWORD32 *PDWORD32;
PDWORD64

Pointer to a DWORD64.

This type is declared in BaseTsd.h as follows:

 

typedef DWORD64 *PDWORD64;
PFLOAT

Pointer to a FLOAT.

This type is declared in WinDef.h as follows:

 

typedef FLOAT *PFLOAT;
PHALF_PTR

Pointer to a HALF_PTR.

This type is declared in Basetsd.h as follows:

 

#ifdef _WIN64
 typedef HALF_PTR *PHALF_PTR;
#else
 typedef HALF_PTR *PHALF_PTR;
#endif
PHANDLE

Pointer to a HANDLE.

This type is declared in WinNT.h as follows:

 

typedef HANDLE *PHANDLE;
PHKEY

Pointer to an HKEY.

This type is declared in WinDef.h as follows:

 

typedef HKEY *PHKEY;
PINT

Pointer to an INT.

This type is declared in WinDef.h as follows:

 

typedef int *PINT;
PINT_PTR

Pointer to an INT_PTR.

This type is declared in BaseTsd.h as follows:

 

typedef INT_PTR *PINT_PTR;
PINT32

Pointer to an INT32.

This type is declared in BaseTsd.h as follows:

 

typedef INT32 *PINT32;
PINT64

Pointer to an INT64.

This type is declared in BaseTsd.h as follows:

 

typedef INT64 *PINT64;
PLCID

Pointer to an LCID.

This type is declared in WinNT.h as follows:

 

typedef PDWORD PLCID;
PLONG

Pointer to a LONG.

This type is declared in WinNT.h as follows:

 

typedef LONG *PLONG;
PLONGLONG

Pointer to a LONGLONG.

This type is declared in WinNT.h as follows:

 

typedef LONGLONG *PLONGLONG;
PLONG_PTR

Pointer to a LONG_PTR.

This type is declared in BaseTsd.h as follows:

 

typedef LONG_PTR *PLONG_PTR;
PLONG32

Pointer to a LONG32.

This type is declared in BaseTsd.h as follows:

 

typedef LONG32 *PLONG32;
PLONG64

Pointer to a LONG64.

This type is declared in BaseTsd.h as follows:

 

typedef LONG64 *PLONG64;
POINTER_32

32-bit pointer. On a 32-bit system, this is a native pointer. On a 64-bit system, this is a truncated 64-bit pointer.

This type is declared in BaseTsd.h as follows:

 

#if defined(_WIN64)
 #define POINTER_32 __ptr32
#else
 #define POINTER_32
#endif
POINTER_64

64-bit pointer. On a 64-bit system, this is a native pointer. On a 32-bit system, this is a sign-extended 32-bit pointer.

Note that it is not safe to assume the state of the high pointer bit.

This type is declared in BaseTsd.h as follows:

 

#if (_MSC_VER >= 1300)
 #define POINTER_64 __ptr64
#else
 #define POINTER_64
#endif
POINTER_SIGNED

A signed pointer.

This type is declared in BaseTsd.h as follows:

 

#define POINTER_SIGNED __sptr
POINTER_UNSIGNED

An unsigned pointer.

This type is declared in BaseTsd.h as follows:

 

#define POINTER_UNSIGNED __uptr
PSHORT

Pointer to a SHORT.

This type is declared in WinNT.h as follows:

 

typedef SHORT *PSHORT;
PSIZE_T

Pointer to a SIZE_T.

This type is declared in BaseTsd.h as follows:

 

typedef SIZE_T *PSIZE_T;
PSSIZE_T

Pointer to a SSIZE_T.

This type is declared in BaseTsd.h as follows:

 

typedef SSIZE_T *PSSIZE_T;
PSTR

Pointer to a null-terminated string of 8-bit Windows (ANSI) characters. For more information, see Character Sets Used By Fonts.

This type is declared in WinNT.h as follows:

 

typedef CHAR *PSTR;
PTBYTE

Pointer to a TBYTE.

This type is declared in WinNT.h as follows:

 

typedef TBYTE *PTBYTE;
PTCHAR

Pointer to a TCHAR.

This type is declared in WinNT.h as follows:

 

typedef TCHAR *PTCHAR;
PTSTR

A PWSTR if UNICODE is defined, a PSTR otherwise.

This type is declared in WinNT.h as follows:

 

#ifdef UNICODE
 typedef LPWSTR PTSTR;
#else typedef LPSTR PTSTR;
#endif
PUCHAR

Pointer to a UCHAR.

This type is declared in WinDef.h as follows:

 

typedef UCHAR *PUCHAR;
PUHALF_PTR

Pointer to a UHALF_PTR.

This type is declared in Basetsd.h as follows:

 

#ifdef _WIN64
 typedef UHALF_PTR *PUHALF_PTR;
#else
 typedef UHALF_PTR *PUHALF_PTR;
#endif
PUINT

Pointer to a UINT.

This type is declared in WinDef.h as follows:

 

typedef UINT *PUINT;
PUINT_PTR

Pointer to a UINT_PTR.

This type is declared in BaseTsd.h as follows:

 

typedef UINT_PTR *PUINT_PTR;
PUINT32

Pointer to a UINT32.

This type is declared in BaseTsd.h as follows:

 

typedef UINT32 *PUINT32;
PUINT64

Pointer to a UINT64.

This type is declared in BaseTsd.h as follows:

 

typedef UINT64 *PUINT64;
PULONG

Pointer to a ULONG.

This type is declared in WinDef.h as follows:

 

typedef ULONG *PULONG;
PULONGLONG

Pointer to a ULONGLONG.

This type is declared in WinDef.h as follows:

 

typedef ULONGLONG *PULONGLONG;
PULONG_PTR

Pointer to a ULONG_PTR.

This type is declared in BaseTsd.h as follows:

 

typedef ULONG_PTR *PULONG_PTR;
PULONG32

Pointer to a ULONG32.

This type is declared in BaseTsd.h as follows:

 

typedef ULONG32 *PULONG32;
PULONG64

Pointer to a ULONG64.

This type is declared in BaseTsd.h as follows:

 

typedef ULONG64 *PULONG64;
PUSHORT

Pointer to a USHORT.

This type is declared in WinDef.h as follows:

 

typedef USHORT *PUSHORT;
PVOID

Pointer to any type.

This type is declared in WinNT.h as follows:

 

typedef void *PVOID;
PWCHAR

Pointer to a WCHAR.

This type is declared in WinNT.h as follows:

 

typedef WCHAR *PWCHAR;
PWORD

Pointer to a WORD.

This type is declared in WinDef.h as follows:

 

typedef WORD *PWORD;
PWSTR

Pointer to a null- terminated string of 16-bit Unicode characters. For more information, see Character Sets Used By Fonts.

This type is declared in WinNT.h as follows:

 

typedef WCHAR *PWSTR;
SC_HANDLE

Handle to a service control manager database. For more information, see SCM Handles.

This type is declared in WinSvc.h as follows:

 

typedef HANDLE SC_HANDLE;
SC_LOCK

Lock to a service control manager database. For more information, see SCM Handles.

This type is declared in WinSvc.h as follows:

 

typedef LPVOID SC_LOCK;
SERVICE_STATUS_HANDLE

Handle to a service status value. For more information, see SCM Handles.

This type is declared in WinSvc.h as follows:

 

typedef HANDLE SERVICE_STATUS_HANDLE;
SHORT

Short integer (16 bits).

This type is declared in WinNT.h as follows:

 

typedef short SHORT;
SIZE_T

The maximum number of bytes to which a pointer can point. Use for a count that must span the full range of a pointer.

This type is declared in BaseTsd.h as follows:

 

typedef ULONG_PTR SIZE_T;
SSIZE_T

Signed SIZE_T.

This type is declared in BaseTsd.h as follows:

 

typedef LONG_PTR SSIZE_T;
TBYTE

A WCHAR if UNICODE is defined, a CHAR otherwise.

This type is declared in WinNT.h as follows:

 

#ifdef UNICODE
 typedef WCHAR TBYTE;
#else
 typedef unsigned char TBYTE;
#endif
TCHAR

A WCHAR if UNICODE is defined, a CHAR otherwise.

This type is declared in WinNT.h as follows:

 

#ifdef UNICODE
 typedef WCHAR TCHAR;
#else
 typedef char TCHAR;
#endif
UCHAR

Unsigned CHAR.

This type is declared in WinDef.h as follows:

 

typedef unsigned char UCHAR;
UHALF_PTR

Unsigned HALF_PTR. Use within a structure that contains a pointer and two small fields.

This type is declared in Basetsd.h as follows:

 

#ifdef _WIN64
 typedef unsigned int UHALF_PTR;
#else
 typedef unsigned short UHALF_PTR;
#endif
UINT

Unsigned INT.

This type is declared in WinDef.h as follows:

 

typedef unsigned int UINT;
UINT_PTR

Unsigned INT_PTR.

This type is declared in BaseTsd.h as follows:

 

#if defined(_WIN64)
 typedef unsigned __int64 UINT_PTR;
#else
 typedef unsigned int UINT_PTR;
#endif
UINT32

Unsigned INT32.

This type is declared in BaseTsd.h as follows:

 

typedef unsigned int UINT32;
UINT64

Unsigned INT64.

This type is declared in BaseTsd.h as follows:

 

typedef usigned __int 64 UINT64;
ULONG

Unsigned LONG.

This type is declared in WinDef.h as follows:

 

typedef unsigned long ULONG;
ULONGLONG

64-bit unsigned integer.

This type is declared in WinNT.h as follows:

 

#if !defined(_M_IX86)
 typedef unsigned __int64 ULONGLONG;
#else
 typedef double ULONGLONG;
#endif
ULONG_PTR

Unsigned LONG_PTR.

This type is declared in BaseTsd.h as follows:

 

#if defined(_WIN64)
 typedef unsigned __int64 ULONG_PTR;
#else
 typedef unsigned long ULONG_PTR;
#endif
ULONG32

Unsigned LONG32.

This type is declared in BaseTsd.h as follows:

 

typedef unsigned int ULONG32;
ULONG64

Unsigned LONG64.

This type is declared in BaseTsd.h as follows:

 

typedef unsigned __int64 ULONG64;
UNICODE_STRING

A Unicode string.

This type is declared in Winternl.h as follows:

 

typedef struct _UNICODE_STRING {
  USHORT  Length;
  USHORT  MaximumLength;
  PWSTR  Buffer;
} UNICODE_STRING;
typedef UNICODE_STRING *PUNICODE_STRING;
typedef const UNICODE_STRING *PCUNICODE_STRING;
USHORT

Unsigned SHORT.

This type is declared in WinDef.h as follows:

 

typedef unsigned short USHORT;
USN

Update sequence number (USN).

This type is declared in WinNT.h as follows:

 

typedef LONGLONG USN;
VOID

Any type.

This type is declared in WinNT.h as follows:

 

#define VOID void
WCHAR

16-bit Unicode character. For more information, see Character Sets Used By Fonts.

This type is declared in WinNT.h as follows:

 

typedef wchar_t WCHAR;
WINAPI

Calling convention for system functions.

This type is declared in WinDef.h as follows:

 

#define WINAPI __stdcall
WORD

16-bit unsigned integer.

This type is declared in WinDef.h as follows:

 

typedef unsigned short WORD;
WPARAM

Message parameter.

This type is declared in WinDef.h as follows:

 

typedef UINT_PTR WPARAM;

출저 : MSDN

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