InternetSetFilePointer

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

DWORD InternetSetFilePointer(
    void* hFile,
    INT lDistanceToMove,
    INT* lpDistanceToMoveHigh,   // optional
    DWORD dwMoveMethod,
    UINT_PTR dwContext   // optional
);

<DllImport("WININET.dll", SetLastError:=True, ExactSpelling:=True)>
Public Shared Function InternetSetFilePointer(
    hFile As IntPtr,   ' void*
    lDistanceToMove As Integer,   ' INT
    lpDistanceToMoveHigh As IntPtr,   ' INT* optional, in/out
    dwMoveMethod As UInteger,   ' DWORD
    dwContext As UIntPtr   ' UINT_PTR optional
) As UInteger
End Function

' hFile : void*
' lDistanceToMove : INT
' lpDistanceToMoveHigh : INT* optional, in/out
' dwMoveMethod : DWORD
' dwContext : UINT_PTR optional
Declare PtrSafe Function InternetSetFilePointer Lib "wininet" ( _
    ByVal hFile As LongPtr, _
    ByVal lDistanceToMove As Long, _
    ByVal lpDistanceToMoveHigh As LongPtr, _
    ByVal dwMoveMethod As Long, _
    ByVal dwContext As LongPtr) As Long
' VBA7前提(PtrSafe)。32bit Office では LongPtr→Long。Integer=16bit / Long=32bit / LongLong=64bit。

import ctypes
from ctypes import wintypes

InternetSetFilePointer = ctypes.windll.wininet.InternetSetFilePointer
InternetSetFilePointer.restype = wintypes.DWORD
InternetSetFilePointer.argtypes = [
    ctypes.POINTER(None),  # hFile : void*
    ctypes.c_int,  # lDistanceToMove : INT
    ctypes.POINTER(ctypes.c_int),  # lpDistanceToMoveHigh : INT* optional, in/out
    wintypes.DWORD,  # dwMoveMethod : DWORD
    ctypes.c_size_t,  # dwContext : UINT_PTR optional
]
# GetLastError: use ctypes.GetLastError() (or ctypes.WinDLL(use_last_error=True))

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('WININET.dll')
InternetSetFilePointer = Fiddle::Function.new(
  lib['InternetSetFilePointer'],
  [
    Fiddle::TYPE_VOIDP,  # hFile : void*
    Fiddle::TYPE_INT,  # lDistanceToMove : INT
    Fiddle::TYPE_VOIDP,  # lpDistanceToMoveHigh : INT* optional, in/out
    -Fiddle::TYPE_INT,  # dwMoveMethod : DWORD
    Fiddle::TYPE_UINTPTR_T,  # dwContext : UINT_PTR optional
  ],
  -Fiddle::TYPE_INT)

#[link(name = "wininet")]
extern "system" {
    fn InternetSetFilePointer(
        hFile: *mut (),  // void*
        lDistanceToMove: i32,  // INT
        lpDistanceToMoveHigh: *mut i32,  // INT* optional, in/out
        dwMoveMethod: u32,  // DWORD
        dwContext: usize  // UINT_PTR optional
    ) -> u32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("WININET.dll", SetLastError = true)]
public static extern uint InternetSetFilePointer(IntPtr hFile, int lDistanceToMove, IntPtr lpDistanceToMoveHigh, uint dwMoveMethod, UIntPtr dwContext);
"@
$api = Add-Type -MemberDefinition $sig -Name 'WININET_InternetSetFilePointer' -Namespace Win32 -PassThru
# $api::InternetSetFilePointer(hFile, lDistanceToMove, lpDistanceToMoveHigh, dwMoveMethod, dwContext)

#uselib "WININET.dll"
#func global InternetSetFilePointer "InternetSetFilePointer" sptr, sptr, sptr, sptr, sptr
; InternetSetFilePointer hFile, lDistanceToMove, varptr(lpDistanceToMoveHigh), dwMoveMethod, dwContext   ; 戻り値は stat
; hFile : void* -> "sptr"
; lDistanceToMove : INT -> "sptr"
; lpDistanceToMoveHigh : INT* optional, in/out -> "sptr"
; dwMoveMethod : DWORD -> "sptr"
; dwContext : UINT_PTR optional -> "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 "WININET.dll"
#cfunc global InternetSetFilePointer "InternetSetFilePointer" sptr, int, var, int, sptr
; res = InternetSetFilePointer(hFile, lDistanceToMove, lpDistanceToMoveHigh, dwMoveMethod, dwContext)
; hFile : void* -> "sptr"
; lDistanceToMove : INT -> "int"
; lpDistanceToMoveHigh : INT* optional, in/out -> "var"
; dwMoveMethod : DWORD -> "int"
; dwContext : UINT_PTR optional -> "sptr"
; ※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。

; DWORD InternetSetFilePointer(void* hFile, INT lDistanceToMove, INT* lpDistanceToMoveHigh, DWORD dwMoveMethod, UINT_PTR dwContext)
#uselib "WININET.dll"
#cfunc global InternetSetFilePointer "InternetSetFilePointer" intptr, int, var, int, intptr
; res = InternetSetFilePointer(hFile, lDistanceToMove, lpDistanceToMoveHigh, dwMoveMethod, dwContext)
; hFile : void* -> "intptr"
; lDistanceToMove : INT -> "int"
; lpDistanceToMoveHigh : INT* optional, in/out -> "var"
; dwMoveMethod : DWORD -> "int"
; dwContext : UINT_PTR optional -> "intptr"
; ※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。

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

var (
	wininet = windows.NewLazySystemDLL("WININET.dll")
	procInternetSetFilePointer = wininet.NewProc("InternetSetFilePointer")
)

// hFile (void*), lDistanceToMove (INT), lpDistanceToMoveHigh (INT* optional, in/out), dwMoveMethod (DWORD), dwContext (UINT_PTR optional)
r1, _, err := procInternetSetFilePointer.Call(
	uintptr(hFile),
	uintptr(lDistanceToMove),
	uintptr(lpDistanceToMoveHigh),
	uintptr(dwMoveMethod),
	uintptr(dwContext),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // DWORD

function InternetSetFilePointer(
  hFile: Pointer;   // void*
  lDistanceToMove: Integer;   // INT
  lpDistanceToMoveHigh: Pointer;   // INT* optional, in/out
  dwMoveMethod: DWORD;   // DWORD
  dwContext: NativeUInt   // UINT_PTR optional
): DWORD; stdcall;
  external 'WININET.dll' name 'InternetSetFilePointer';

result := DllCall("WININET\InternetSetFilePointer"
    , "Ptr", hFile   ; void*
    , "Int", lDistanceToMove   ; INT
    , "Ptr", lpDistanceToMoveHigh   ; INT* optional, in/out
    , "UInt", dwMoveMethod   ; DWORD
    , "UPtr", dwContext   ; UINT_PTR optional
    , "UInt")   ; return: DWORD

●InternetSetFilePointer(hFile, lDistanceToMove, lpDistanceToMoveHigh, dwMoveMethod, dwContext) = DLL("WININET.dll", "dword InternetSetFilePointer(void*, int, void*, dword, int)")
# 呼び出し: InternetSetFilePointer(hFile, lDistanceToMove, lpDistanceToMoveHigh, dwMoveMethod, dwContext)
# hFile : void* -> "void*"
# lDistanceToMove : INT -> "int"
# lpDistanceToMoveHigh : INT* optional, in/out -> "void*"
# dwMoveMethod : DWORD -> "dword"
# dwContext : UINT_PTR optional -> "int"
# 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)。