SetScrollPos

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

INT SetScrollPos(
    HWND hWnd,
    SCROLLBAR_CONSTANTS nBar,
    INT nPos,
    BOOL bRedraw
);

<DllImport("USER32.dll", SetLastError:=True, ExactSpelling:=True)>
Public Shared Function SetScrollPos(
    hWnd As IntPtr,   ' HWND
    nBar As Integer,   ' SCROLLBAR_CONSTANTS
    nPos As Integer,   ' INT
    bRedraw As Boolean   ' BOOL
) As Integer
End Function

' hWnd : HWND
' nBar : SCROLLBAR_CONSTANTS
' nPos : INT
' bRedraw : BOOL
Declare PtrSafe Function SetScrollPos Lib "user32" ( _
    ByVal hWnd As LongPtr, _
    ByVal nBar As Long, _
    ByVal nPos As Long, _
    ByVal bRedraw 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

SetScrollPos = ctypes.windll.user32.SetScrollPos
SetScrollPos.restype = ctypes.c_int
SetScrollPos.argtypes = [
    wintypes.HANDLE,  # hWnd : HWND
    ctypes.c_int,  # nBar : SCROLLBAR_CONSTANTS
    ctypes.c_int,  # nPos : INT
    wintypes.BOOL,  # bRedraw : BOOL
]
# GetLastError: use ctypes.GetLastError() (or ctypes.WinDLL(use_last_error=True))

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('USER32.dll')
SetScrollPos = Fiddle::Function.new(
  lib['SetScrollPos'],
  [
    Fiddle::TYPE_VOIDP,  # hWnd : HWND
    Fiddle::TYPE_INT,  # nBar : SCROLLBAR_CONSTANTS
    Fiddle::TYPE_INT,  # nPos : INT
    Fiddle::TYPE_INT,  # bRedraw : BOOL
  ],
  Fiddle::TYPE_INT)

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

$sig = @"
[DllImport("USER32.dll", SetLastError = true)]
public static extern int SetScrollPos(IntPtr hWnd, int nBar, int nPos, bool bRedraw);
"@
$api = Add-Type -MemberDefinition $sig -Name 'USER32_SetScrollPos' -Namespace Win32 -PassThru
# $api::SetScrollPos(hWnd, nBar, nPos, bRedraw)

#uselib "USER32.dll"
#func global SetScrollPos "SetScrollPos" sptr, sptr, sptr, sptr
; SetScrollPos hWnd, nBar, nPos, bRedraw   ; 戻り値は stat
; hWnd : HWND -> "sptr"
; nBar : SCROLLBAR_CONSTANTS -> "sptr"
; nPos : INT -> "sptr"
; bRedraw : BOOL -> "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。

#uselib "USER32.dll"
#cfunc global SetScrollPos "SetScrollPos" sptr, int, int, int
; res = SetScrollPos(hWnd, nBar, nPos, bRedraw)
; hWnd : HWND -> "sptr"
; nBar : SCROLLBAR_CONSTANTS -> "int"
; nPos : INT -> "int"
; bRedraw : BOOL -> "int"

; INT SetScrollPos(HWND hWnd, SCROLLBAR_CONSTANTS nBar, INT nPos, BOOL bRedraw)
#uselib "USER32.dll"
#cfunc global SetScrollPos "SetScrollPos" intptr, int, int, int
; res = SetScrollPos(hWnd, nBar, nPos, bRedraw)
; hWnd : HWND -> "intptr"
; nBar : SCROLLBAR_CONSTANTS -> "int"
; nPos : INT -> "int"
; bRedraw : BOOL -> "int"

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

var (
	user32 = windows.NewLazySystemDLL("USER32.dll")
	procSetScrollPos = user32.NewProc("SetScrollPos")
)

// hWnd (HWND), nBar (SCROLLBAR_CONSTANTS), nPos (INT), bRedraw (BOOL)
r1, _, err := procSetScrollPos.Call(
	uintptr(hWnd),
	uintptr(nBar),
	uintptr(nPos),
	uintptr(bRedraw),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // INT

function SetScrollPos(
  hWnd: THandle;   // HWND
  nBar: Integer;   // SCROLLBAR_CONSTANTS
  nPos: Integer;   // INT
  bRedraw: BOOL   // BOOL
): Integer; stdcall;
  external 'USER32.dll' name 'SetScrollPos';

result := DllCall("USER32\SetScrollPos"
    , "Ptr", hWnd   ; HWND
    , "Int", nBar   ; SCROLLBAR_CONSTANTS
    , "Int", nPos   ; INT
    , "Int", bRedraw   ; BOOL
    , "Int")   ; return: INT

●SetScrollPos(hWnd, nBar, nPos, bRedraw) = DLL("USER32.dll", "int SetScrollPos(void*, int, int, bool)")
# 呼び出し: SetScrollPos(hWnd, nBar, nPos, bRedraw)
# hWnd : HWND -> "void*"
# nBar : SCROLLBAR_CONSTANTS -> "int"
# nPos : INT -> "int"
# bRedraw : BOOL -> "bool"
# 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)。

const std = @import("std");

extern "user32" fn SetScrollPos(
    hWnd: ?*anyopaque, // HWND
    nBar: i32, // SCROLLBAR_CONSTANTS
    nPos: i32, // INT
    bRedraw: i32 // BOOL
) callconv(std.os.windows.WINAPI) i32;

proc SetScrollPos(
    hWnd: pointer,  # HWND
    nBar: int32,  # SCROLLBAR_CONSTANTS
    nPos: int32,  # INT
    bRedraw: int32  # BOOL
): int32 {.importc: "SetScrollPos", stdcall, dynlib: "USER32.dll".}

pragma(lib, "user32");
extern(Windows)
int SetScrollPos(
    void* hWnd,   // HWND
    int nBar,   // SCROLLBAR_CONSTANTS
    int nPos,   // INT
    int bRedraw   // BOOL
);

ccall((:SetScrollPos, "USER32.dll"), stdcall, Int32,
      (Ptr{Cvoid}, Int32, Int32, Int32),
      hWnd, nBar, nPos, bRedraw)
# hWnd : HWND -> Ptr{Cvoid}
# nBar : SCROLLBAR_CONSTANTS -> Int32
# nPos : INT -> Int32
# bRedraw : BOOL -> Int32
# stdcall は 32bit のみ意味を持つ(x64 では無視)。

local ffi = require("ffi")
ffi.cdef[[
int32_t SetScrollPos(
    void* hWnd,
    int32_t nBar,
    int32_t nPos,
    int32_t bRedraw);
]]
local user32 = ffi.load("user32")
-- user32.SetScrollPos(hWnd, nBar, nPos, bRedraw)
-- hWnd : HWND
-- nBar : SCROLLBAR_CONSTANTS
-- nPos : INT
-- bRedraw : BOOL
-- 構造体/GUIDへのポインタは cdef が通るよう void* で表記(実型は各引数コメント参照)。値渡し構造体・enum は対応する typedef を cdef に追加すること。

const koffi = require('koffi');
const lib = koffi.load('USER32.dll');
const SetScrollPos = lib.func('__stdcall', 'SetScrollPos', 'int32_t', ['void *', 'int32_t', 'int32_t', 'int32_t']);
// SetScrollPos(hWnd, nBar, nPos, bRedraw)
// hWnd : HWND -> 'void *'
// nBar : SCROLLBAR_CONSTANTS -> 'int32_t'
// nPos : INT -> 'int32_t'
// bRedraw : BOOL -> 'int32_t'
// 出力ポインタは koffi.out(...) で包む。構造体は koffi.struct で定義。

const lib = Deno.dlopen("USER32.dll", {
  SetScrollPos: { parameters: ["pointer", "i32", "i32", "i32"], result: "i32" },
});
// lib.symbols.SetScrollPos(hWnd, nBar, nPos, bRedraw)
// hWnd : HWND -> "pointer"
// nBar : SCROLLBAR_CONSTANTS -> "i32"
// nPos : INT -> "i32"
// bRedraw : BOOL -> "i32"
// 文字列引数は "buffer"(NUL 終端のバイト列を Uint8Array で渡す)。
// 値渡し構造体は { struct: [ ...field types... ] } を使用。

<?php
$ffi = FFI::cdef(<<<C
int32_t SetScrollPos(
    void* hWnd,
    int32_t nBar,
    int32_t nPos,
    int32_t bRedraw);
C, "USER32.dll");
// $ffi->SetScrollPos(hWnd, nBar, nPos, bRedraw);
// hWnd : HWND
// nBar : SCROLLBAR_CONSTANTS
// nPos : INT
// bRedraw : BOOL
// 構造体/GUIDへのポインタは cdef が通るよう void* で表記(実型は各引数コメント参照)。値渡し構造体・enum は対応する typedef を cdef に追加すること。
// WINAPI(stdcall): x64 では呼出規約が統一されるため問題なし。x86 では __stdcall 対応のラッパが必要な場合あり。

import com.sun.jna.*;
import com.sun.jna.ptr.*;
import com.sun.jna.win32.StdCallLibrary;
import com.sun.jna.win32.W32APIOptions;

public interface User32 extends StdCallLibrary {
    User32 INSTANCE = Native.load("user32", User32.class);
    int SetScrollPos(
        Pointer hWnd,   // HWND
        int nBar,   // SCROLLBAR_CONSTANTS
        int nPos,   // INT
        boolean bRedraw   // BOOL
    );
}

@[Link("user32")]
lib LibUSER32
  fun SetScrollPos = SetScrollPos(
    hWnd : Void*,   # HWND
    nBar : Int32,   # SCROLLBAR_CONSTANTS
    nPos : Int32,   # INT
    bRedraw : Int32   # BOOL
  ) : Int32
end
# 構造体/GUID/enum は lib 内に対応する型定義が必要。
# 呼出規約: x64 は規約統一のため OK。x86(32bit)は WINAPI=stdcall だが Crystal の fun に stdcall 付与構文がなく非対応。

import 'dart:ffi';
import 'package:ffi/ffi.dart';

typedef SetScrollPosNative = Int32 Function(Pointer<Void>, Int32, Int32, Int32);
typedef SetScrollPosDart = int Function(Pointer<Void>, int, int, int);
final SetScrollPos = DynamicLibrary.open('USER32.dll')
    .lookupFunction<SetScrollPosNative, SetScrollPosDart>('SetScrollPos');
// hWnd : HWND -> Pointer<Void>
// nBar : SCROLLBAR_CONSTANTS -> Int32
// nPos : INT -> Int32
// bRedraw : BOOL -> Int32
// 文字列は package:ffi の "...".toNativeUtf16()/toNativeUtf8() で変換。

{$mode objfpc}{$H+}
function SetScrollPos(
  hWnd: THandle;   // HWND
  nBar: Integer;   // SCROLLBAR_CONSTANTS
  nPos: Integer;   // INT
  bRedraw: BOOL   // BOOL
): Integer; stdcall;
  external 'USER32.dll' name 'SetScrollPos';

import Foreign
import Foreign.C.Types
import Foreign.C.String

foreign import stdcall safe "SetScrollPos"
  c_SetScrollPos :: Ptr () -> Int32 -> Int32 -> CInt -> IO Int32
-- hWnd : HWND -> Ptr ()
-- nBar : SCROLLBAR_CONSTANTS -> Int32
-- nPos : INT -> Int32
-- bRedraw : BOOL -> CInt
-- 要 GHC(Windows)。stdcall は x64 では ccall として扱われる。ブロックする API は safe 呼び出し推奨。

open Ctypes
open Foreign

let setscrollpos =
  foreign "SetScrollPos"
    ((ptr void) @-> int32_t @-> int32_t @-> int32_t @-> returning int32_t)
(* hWnd : HWND -> (ptr void) *)
(* nBar : SCROLLBAR_CONSTANTS -> int32_t *)
(* nPos : INT -> int32_t *)
(* bRedraw : BOOL -> int32_t *)
(* foreign は cdecl 前提。x64 Windows では WINAPI と一致。構造体は ctypes structure を定義のこと。 *)

(cffi:define-foreign-library user32 (t "USER32.dll"))
(cffi:use-foreign-library user32)

(cffi:defcfun ("SetScrollPos" set-scroll-pos :convention :stdcall) :int32
  (h-wnd :pointer)   ; HWND
  (n-bar :int32)   ; SCROLLBAR_CONSTANTS
  (n-pos :int32)   ; INT
  (b-redraw :int32))   ; BOOL
; isize/usize(INT_PTR/SIZE_T)は x64 前提で :int64/:uint64。x86 では :int32/:uint32。

use Win32::API;
my $SetScrollPos = Win32::API::More->new('USER32',
    'int SetScrollPos(HANDLE hWnd, int nBar, int nPos, BOOL bRedraw)');
# my $ret = $SetScrollPos->Call($hWnd, $nBar, $nPos, $bRedraw);
# hWnd : HWND -> HANDLE
# nBar : SCROLLBAR_CONSTANTS -> int
# nPos : INT -> int
# bRedraw : BOOL -> BOOL
# 値渡し構造体は pack() した文字列、または Win32::API::Struct を使用。