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GetScrollRange

関数

スクロールバーの最小・最大位置の範囲を取得する。

DLLUSER32.dll呼出規約winapiSetLastErrorあり対応OSWindows Vista 以降

シグネチャ

// USER32.dll
#include <windows.h>

BOOL GetScrollRange(
    HWND hWnd,
    SCROLLBAR_CONSTANTS nBar,
    INT* lpMinPos,
    INT* lpMaxPos
);

パラメーター

名前	型	方向
hWnd	HWND	in
nBar	SCROLLBAR_CONSTANTS	in
lpMinPos	INT*	out
lpMaxPos	INT*	out

戻り値の型: BOOL

各言語での呼び出し定義

// USER32.dll
#include <windows.h>

BOOL GetScrollRange(
    HWND hWnd,
    SCROLLBAR_CONSTANTS nBar,
    INT* lpMinPos,
    INT* lpMaxPos
);

[return: MarshalAs(UnmanagedType.Bool)]
[DllImport("USER32.dll", SetLastError = true, ExactSpelling = true)]
static extern bool GetScrollRange(
    IntPtr hWnd,   // HWND
    int nBar,   // SCROLLBAR_CONSTANTS
    out int lpMinPos,   // INT* out
    out int lpMaxPos   // INT* out
);

<DllImport("USER32.dll", SetLastError:=True, ExactSpelling:=True)>
Public Shared Function GetScrollRange(
    hWnd As IntPtr,   ' HWND
    nBar As Integer,   ' SCROLLBAR_CONSTANTS
    <Out> ByRef lpMinPos As Integer,   ' INT* out
    <Out> ByRef lpMaxPos As Integer   ' INT* out
) As Boolean
End Function

' hWnd : HWND
' nBar : SCROLLBAR_CONSTANTS
' lpMinPos : INT* out
' lpMaxPos : INT* out
Declare PtrSafe Function GetScrollRange Lib "user32" ( _
    ByVal hWnd As LongPtr, _
    ByVal nBar As Long, _
    ByRef lpMinPos As Long, _
    ByRef lpMaxPos As Long) As Long
' VBA7前提(PtrSafe)。32bit Office では LongPtr→Long。Integer=16bit / Long=32bit / LongLong=64bit。

import ctypes
from ctypes import wintypes

GetScrollRange = ctypes.windll.user32.GetScrollRange
GetScrollRange.restype = wintypes.BOOL
GetScrollRange.argtypes = [
    wintypes.HANDLE,  # hWnd : HWND
    ctypes.c_int,  # nBar : SCROLLBAR_CONSTANTS
    ctypes.POINTER(ctypes.c_int),  # lpMinPos : INT* out
    ctypes.POINTER(ctypes.c_int),  # lpMaxPos : INT* out
]
# GetLastError: use ctypes.GetLastError() (or ctypes.WinDLL(use_last_error=True))

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('USER32.dll')
GetScrollRange = Fiddle::Function.new(
  lib['GetScrollRange'],
  [
    Fiddle::TYPE_VOIDP,  # hWnd : HWND
    Fiddle::TYPE_INT,  # nBar : SCROLLBAR_CONSTANTS
    Fiddle::TYPE_VOIDP,  # lpMinPos : INT* out
    Fiddle::TYPE_VOIDP,  # lpMaxPos : INT* out
  ],
  Fiddle::TYPE_INT)

#[link(name = "user32")]
extern "system" {
    fn GetScrollRange(
        hWnd: *mut core::ffi::c_void,  // HWND
        nBar: i32,  // SCROLLBAR_CONSTANTS
        lpMinPos: *mut i32,  // INT* out
        lpMaxPos: *mut i32  // INT* out
    ) -> i32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[return: MarshalAs(UnmanagedType.Bool)]
[DllImport("USER32.dll", SetLastError = true)]
public static extern bool GetScrollRange(IntPtr hWnd, int nBar, out int lpMinPos, out int lpMaxPos);
"@
$api = Add-Type -MemberDefinition $sig -Name 'USER32_GetScrollRange' -Namespace Win32 -PassThru
# $api::GetScrollRange(hWnd, nBar, lpMinPos, lpMaxPos)

#uselib "USER32.dll"
#func global GetScrollRange "GetScrollRange" sptr, sptr, sptr, sptr
; GetScrollRange hWnd, nBar, varptr(lpMinPos), varptr(lpMaxPos)   ; 戻り値は stat
; hWnd : HWND -> "sptr"
; nBar : SCROLLBAR_CONSTANTS -> "sptr"
; lpMinPos : INT* out -> "sptr"
; lpMaxPos : INT* out -> "sptr"
; ※HSP3.7は #func のため戻り値はシステム変数 stat に格納されます。

出力引数:

#uselib "USER32.dll"
#cfunc global GetScrollRange "GetScrollRange" sptr, int, var, var
; res = GetScrollRange(hWnd, nBar, lpMinPos, lpMaxPos)
; hWnd : HWND -> "sptr"
; nBar : SCROLLBAR_CONSTANTS -> "int"
; lpMinPos : INT* out -> "var"
; lpMaxPos : INT* out -> "var"
; ※出力/バッファ引数は var 方式(変数を直接渡す)。varptr 方式にも切替可。#uselib "USER32.dll"
#cfunc global GetScrollRange "GetScrollRange" sptr, int, sptr, sptr
; res = GetScrollRange(hWnd, nBar, varptr(lpMinPos), varptr(lpMaxPos))
; hWnd : HWND -> "sptr"
; nBar : SCROLLBAR_CONSTANTS -> "int"
; lpMinPos : INT* out -> "sptr"
; lpMaxPos : INT* out -> "sptr"
; ※出力/バッファ引数はポインタ方式(token=sptr / 呼び出しは varptr(変数))。

出力引数:

; BOOL GetScrollRange(HWND hWnd, SCROLLBAR_CONSTANTS nBar, INT* lpMinPos, INT* lpMaxPos)
#uselib "USER32.dll"
#cfunc global GetScrollRange "GetScrollRange" intptr, int, var, var
; res = GetScrollRange(hWnd, nBar, lpMinPos, lpMaxPos)
; hWnd : HWND -> "intptr"
; nBar : SCROLLBAR_CONSTANTS -> "int"
; lpMinPos : INT* out -> "var"
; lpMaxPos : INT* out -> "var"
; ※出力/バッファ引数は var 方式(変数を直接渡す)。varptr 方式にも切替可。; BOOL GetScrollRange(HWND hWnd, SCROLLBAR_CONSTANTS nBar, INT* lpMinPos, INT* lpMaxPos)
#uselib "USER32.dll"
#cfunc global GetScrollRange "GetScrollRange" intptr, int, intptr, intptr
; res = GetScrollRange(hWnd, nBar, varptr(lpMinPos), varptr(lpMaxPos))
; hWnd : HWND -> "intptr"
; nBar : SCROLLBAR_CONSTANTS -> "int"
; lpMinPos : INT* out -> "intptr"
; lpMaxPos : INT* out -> "intptr"
; ※出力/バッファ引数はポインタ方式(token=intptr / 呼び出しは varptr(変数))。

import (
	"golang.org/x/sys/windows"
	"unsafe"
)

var (
	user32 = windows.NewLazySystemDLL("USER32.dll")
	procGetScrollRange = user32.NewProc("GetScrollRange")
)

// hWnd (HWND), nBar (SCROLLBAR_CONSTANTS), lpMinPos (INT* out), lpMaxPos (INT* out)
r1, _, err := procGetScrollRange.Call(
	uintptr(hWnd),
	uintptr(nBar),
	uintptr(lpMinPos),
	uintptr(lpMaxPos),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // BOOL

function GetScrollRange(
  hWnd: THandle;   // HWND
  nBar: Integer;   // SCROLLBAR_CONSTANTS
  lpMinPos: Pointer;   // INT* out
  lpMaxPos: Pointer   // INT* out
): BOOL; stdcall;
  external 'USER32.dll' name 'GetScrollRange';

result := DllCall("USER32\GetScrollRange"
    , "Ptr", hWnd   ; HWND
    , "Int", nBar   ; SCROLLBAR_CONSTANTS
    , "Ptr", lpMinPos   ; INT* out
    , "Ptr", lpMaxPos   ; INT* out
    , "Int")   ; return: BOOL

●GetScrollRange(hWnd, nBar, lpMinPos, lpMaxPos) = DLL("USER32.dll", "bool GetScrollRange(void*, int, void*, void*)")
# 呼び出し: GetScrollRange(hWnd, nBar, lpMinPos, lpMaxPos)
# hWnd : HWND -> "void*"
# nBar : SCROLLBAR_CONSTANTS -> "int"
# lpMinPos : INT* out -> "void*"
# lpMaxPos : INT* out -> "void*"
# なでしこ1は32bit・ANSI(Shift_JIS)。文字列=char*(ANSI)、ポインタ/ハンドル=void*(4byte)。