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Win32 Simple Data Types The simple data types supported by the Win32 API are used to define function return values, function and message parameters, and structure members. They define the size and meaning of these elements

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. A Win32-based application uses a handle to refer to a resource that has been loaded into memory.

Type Definition ABORTPROC Pointer to an application-defined callback function that the system calls when a print job is to be canceled during spooling. SeeAbortProc for information on functions of this type. ACMDRIVERENUMCB Pointer to an application-defined callback function that is used withacmDriverEnum. SeeacmDriverEnumCallback for information on functions of this type. ACMDRIVERPROC Pointer to an application-defined callback function that is used with an installable audio compression manager (ACM) driver. SeeacmDriverProc for information on functions of this type. ACMFILTERCHOOSEHOOKPROC Pointer to an application-defined function that hooks theacmFilterChoose dialog box. SeeacmFilterChooseHookProc for information on functions of this type. ACMFILTERENUMCB Pointer to an application-defined callback function that is used with theacmFilterEnum function. SeeacmFilterEnumCallback for information on functions of this type. ACMFILTERTAGENUMCB Pointer to an application-defined callback function that is used withacmFilterTagEnum. SeeacmFilterTagEnumCallback for information on functions of this type. ACMFORMATCHOOSEHOOKPROC Pointer to an application-defined function that hooks theacmFormatChoose dialog box. SeeacmFormatChooseHookProc for information on functions of this type. ACMFORMATENUMCB Pointer to an application-defined callback function that is used with theacmFormatEnum function. SeeacmFormatEnumCallback for information on functions of this type. ACMFORMATTAGENUMCB Pointer to an application-defined callback function that is used withacmFormatTagEnum. SeeacmFormatTagEnumCallback for information on functions of this type. APPLET_PROC Pointer to a library-defined callback function that is the entry point for a Control Panel application. SeeCplApplet for information on functions of this type. ATOM Atom (a reference to a character string in an atom table). BOOL Boolean variable (should be TRUE or FALSE). BOOLEAN Boolean variable (should be TRUE or FALSE). BYTE Byte (8 bits). CALINFO_ENUMPROC Pointer to an application-defined callback function that receives a calendar information string. SeeEnumCalendarInfoProc for information on functions of this type. CALLBACK Calling convention for callback functions. CHAR 8-bit Windows (ANSI) character. For more information, seeCharacter Sets Used By Fonts. COLORREF Red, green, blue (RGB) color value (32 bits). SeeCOLORREF for information on this type. CONST Variable whose value is to remain constant during execution. CRITICAL_SECTION Critical-section object. CTRYID Country identifier. DATEFMT_ENUMPROC Pointer to an application-defined callback function that receives a date format string. SeeEnumDateFormatsProc for information on functions of this type. DESKTOPENUMPROC Pointer to an application-defined callback function that receives a desktop name. SeeEnumDesktopProc for information on functions of this type. DLGPROC Pointer to an application-defined dialog box callback procedure. SeeDialogProc for information on functions of this type. DRAWSTATEPROC Pointer to an application-defined callback function that renders a complex image. SeeDrawStateProc for information on functions of this type. DWORD 32-bit unsigned integer. EDITWORDBREAKPROC Pointer to an application-defined callback function that the operating system calls when a multiline edit control needs to break a line of text. SeeEditWordBreakProc for information on functions of this type. ENHMFENUMPROC Pointer to an application-defined callback function that enumerates enhanced-metafile records. SeeEnhMetaFileProc for information on functions of this type. ENUMRESLANGPROC Pointer to an application-defined callback function that enumerates resource languages. SeeEnumResLangProc for information on functions of this type. ENUMRESNAMEPROC Pointer to an application-defined callback function that enumerates resource names. SeeEnumResNameProc for information on functions of this type. ENUMRESTYPEPROC Pointer to an application-defined callback function that enumerates resource types. SeeEnumResTypeProc for information on functions of this type. FARPROC Pointer to a callback function. FLOAT Floating-point variable. FILE_SEGMENT_ELEMENT 64-bit pointer to a buffer. FONTENUMPROC Pointer to an application-defined callback function that enumerates fonts. SeeEnumFontFamExProc for information on functions of this type. GOBJENUMPROC Pointer to an application-defined callback function that enumerates graphics device interface (GDI) objects. SeeEnumObjectsProc for information on functions of this type. GRAYSTRINGPROC Pointer to an application-defined callback function that draws gray text. SeeOutputProc for information on functions of this type. HACCEL Handle to an accelerator table. HANDLE Handle to an object. HBITMAP Handle to a bitmap. HBRUSH Handle to a brush. HCOLORSPACE Handle to a logical color space. HCONV Handle to a dynamic data exchange (DDE) conversation. HCONVLIST Handle to a DDE conversation list. HCURSOR Handle to a cursor. HDC Handle to a device context (DC). HDDEDATA Handle to DDE data. HDESK Handle to a desktop. HDROP Handle to an internal drop structure. HDWP Handle to a deferred window position structure. HENHMETAFILE Handle to an enhanced metafile. HFILE Handle to a file opened byOpenFile, notCreateFile. HFONT Handle to a font. HGDIOBJ Handle to a GDI object. HGLOBAL Handle to a global memory block. HHOOK Handle to a hook. HICON Handle to an icon. HIMAGELIST Handle to an image list. HIMC Handle to input context. HINSTANCE Handle to an instance. HKEY Handle to a registry key. HKL Handle to a keyboard layout. HLOCAL Handle to a local memory block. HMENU Handle to a menu. HMETAFILE Handle to a metafile. HMODULE Handle to a module. HMONITOR Handle to a display monitor. HOOKPROC Pointer to an application-defined hook function specified toSetWindowsHookEx. See the following for information on functions of this type: CallWndProc CallWndRetProc CBTProc DebugProc ForegroundIdleProc GetMsgProc JournalPlaybackProc JournalRecordProc KeyboardProc LowLevelKeyboardProc LowLevelMouseProc MessageProc MouseProc ShellProc SysMsgProc HPALETTE Handle to a palette. HPEN Handle to a pen. HRGN Handle to a region. HRSRC Handle to a resource. HSZ Handle to a DDE string. HTREEITEM Handle to an item in a tree-view control. HWINSTA Handle to a window station. HWND Handle to a window. INT Signed integer. IPADDR IP address. To convert this value to the "a.b.c.d" string form of an IP address, map the high-order byte to a, the low-order byte to d, and so on. LANGID Language identifier. For more information, seeLanguage Identifiers and Locales. LCID Locale identifier. For more information, seeLocale Identifiers (LCIDs). LCSCSTYPE Color space type. LCSGAMUTMATCH Gamut-matching method. LCTYPE Locale information type. For a list, seeLCTYPE Constants. LINEDDAPROC Pointer to a callback function that processes line coordinates. SeeLineDDAProc for information on functions of this type. LOCALE_ENUMPROC Pointer to an application-defined callback function that receives a locale identifier string. SeeEnumLocalesProc for information on functions of this type. LONG 32-bit signed integer. LONGLONG 64-bit signed integer. LPARAM 32-bit message parameter. LPBOOL Pointer to a BOOL. LPBYTE Pointer to a BYTE. LPCCHOOKPROC Pointer to an application-defined hook function used with the Color common dialog box. SeeCCHookProc for information on functions of this type. LPCFHOOKPROC Pointer to an application-defined hook function used with the Font common dialog box. SeeCFHookProc for information on functions of this type. LPCOLORREF Pointer to aCOLORREF value. LPCRITICAL_SECTION Pointer to a CRITICAL_SECTION. LPCSTR Pointer to a constant null-terminated string of 8-bit Windows (ANSI) characters. For more information, seeCharacter Sets Used By Fonts. LPCTSTR An LPCWSTR ifUNICODE is defined, an LPCSTR otherwise. LPCVOID Pointer to a constant of any type. LPCWSTR Pointer to a constant null-terminated string of 16-bit Unicode characters. For more information, seeCharacter Sets Used By Fonts. LPDWORD Pointer to a DWORD. LPFIBER_START_ROUTINE Pointer to a fiber function. SeeFiberProc for information on functions of this type. LPFRHOOKPROC Pointer to an application-defined hook function used with the Find and Replace common dialog boxes. SeeFRHookProc for information on functions of this type. LPHANDLE Pointer to a HANDLE. LPHANDLER_FUNCTION Pointer to a control handler function for a Win32 service. SeeHandler for information on functions of this type. LPINT Pointer to an INT. LPLONG Pointer to a LONG. LPOFNHOOKPROC Pointer to an application-defined hook function used with the Open and Save As common dialog boxes. SeeOFNHookProc for information on functions of this type. LPPAGEPAINTHOOK Pointer to an application-defined callback function used with the Page Setup common dialog box. SeePagePaintHook for information on functions of this type. LPPAGESETUPHOOK Pointer to an application-defined callback function used with the Page Setup common dialog box. SeePageSetupHook for information on functions of this type. LPPRINTHOOKPROC Pointer to an application-defined hook function used with the Print common dialog box. SeePrintHookProc for information on functions of this type. LPPROGRESS_ROUTINE Pointer to an application-defined callback function that is called byCopyFileEx. SeeCopyProgressRoutine for information on functions of this type. LPSETUPHOOKPROC Pointer to an application-defined hook function used with the Print Setup common dialog box. SeeSetupHookProc for information on functions of this type. LPSTR Pointer to a null-terminated string of 8-bit Windows (ANSI) characters. For more information, seeCharacter Sets Used By Fonts. LPSTREAM Pointer to a stream. LPTHREAD_START_ROUTINE Pointer to a thread function. SeeThreadProc for information on functions of this type. LPTSTR An LPWSTR ifUNICODE is defined, an LPSTR otherwise. LPVOID Pointer to any type. LPWORD Pointer to a WORD. LPWSTR Pointer to a null-terminated string of 16-bit Unicode characters. For more information, seeCharacter Sets Used By Fonts. LRESULT Signed result of message processing. LUID Locally unique identifier. PBOOL Pointer to a BOOL. PBOOLEAN Pointer to a BOOL. PBYTE Pointer to a BYTE. PCHAR Pointer to a CHAR. PCRITICAL_SECTION Pointer to a CRITICAL_SECTION. PCSTR Pointer to a constant null-terminated string of 8-bit Windows (ANSI) characters. For more information, seeCharacter Sets Used By Fonts. PCTSTR A PCWSTR ifUNICODE is defined, a PCSTR otherwise. PCWCH Pointer to a constant WCHAR. PCWSTR Pointer to a constant null-terminated string of 16-bit Unicode characters. For more information, seeCharacter Sets Used By Fonts. PDWORD Pointer to a DWORD. PFLOAT Pointer to a FLOAT. PFNCALLBACK Pointer to an application-defined callback function that processes DDE transactions. SeeDdeCallback for information on functions of this type. PHANDLE Pointer to a HANDLE. PHANDLER_ROUTINE Pointer to a console control handler routine. SeeHandlerRoutine for information on functions of this type. PHKEY Pointer to an HKEY. PINT Pointer to an INT. PLCID Pointer to an LCID. PLONG Pointer to a LONG. PLUID Pointer to a LUID. PROPENUMPROC Pointer to an application-defined callback function that enumerates window properties. SeePropEnumProc for information on functions of this type. PROPENUMPROCEX Pointer to an application-defined callback function that enumerates window properties. SeePropEnumProcEx for information on functions of this type. PSHORT Pointer to a SHORT. PSTR Pointer to a null-terminated string of 8-bit Windows (ANSI) characters. For more information, seeCharacter Sets Used By Fonts. PTBYTE Pointer to a TBYTE. PTCHAR Pointer to a TCHAR. PTIMERAPCROUTINE Pointer to a timer completion routine. SeeTimerAPCProc for information on functions of this type. PTSTR A PWSTR ifUNICODE is defined, a PSTR otherwise. PUCHAR Pointer to a UCHAR. PUINT Pointer to a UINT. PULONG Pointer to a ULONG. PUSHORT Pointer to a USHORT. PVOID Pointer to any type. PWCHAR Pointer to a WCHAR. PWORD Pointer to a WORD. PWSTR Pointer to a null-terminated string of 16-bit Unicode characters. For more information, seeCharacter Sets Used By Fonts. REGISTERWORDENUMPROC Pointer to an application-defined callback function that processes register strings. SeeEnumRegisterWordProc for information on functions of this type. REGSAM Security access mask for registry key. SC_HANDLE Handle to a service control manager database. SC_LOCK Handle to a service control manager database lock. SENDASYNCPROC Pointer to an application-defined callback function that the operating system calls whenSendMessageCallback is called. SeeSendAsyncProc for information on functions of this type. SERVICE_STATUS_HANDLE Handle to a service status value. SHORT Short integer. TBYTE A WCHAR ifUNICODE is defined, a CHAR otherwise. TCHAR A WCHAR ifUNICODE is defined, a CHAR otherwise. TIMEFMT_ENUMPROC Pointer to an application-defined callback function that receives a time format string. SeeEnumTimeFormatsProc for information on functions of this type. TIMERPROC Pointer to an application-defined timer callback function. SeeTimerProc for information on functions of this type. UCHAR Unsigned CHAR. UINT Unsigned INT. ULONG Unsigned LONG. ULONGLONG 64-bit unsigned integer. UNSIGNED Unsigned attribute. USHORT Unsigned SHORT. VOID Any type. WCHAR 16-bit Unicode character. For more information, seeCharacter Sets Used By Fonts. WINAPI Calling convention for the Win32 API. WINSTAENUMPROC Pointer to an application-defined callback function that receives a window station name. SeeEnumWindowStationProc for information on functions of this type. WNDENUMPROC Pointer to an application-defined callback function that enumerates windows. See the following for information on functions of this type: EnumChildProc EnumThreadWndProc EnumWindowsProc WNDPROC Pointer to an application-defined window procedure. SeeWindowProc for information on functions of this type. WORD 16-bit unsigned integer. WPARAM 32-bit message parameter. YIELDPROC Pointer to a yield callback function. SeemciSetYieldProc for information on functions of this type.

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