AVIStreamOpenFromFileW

// AVIFIL32.dll  (Unicode / -W)
#include <windows.h>

HRESULT AVIStreamOpenFromFileW(
    IAVIStream** ppavi,
    LPCWSTR szFile,
    DWORD fccType,
    INT lParam,
    DWORD mode,
    GUID* pclsidHandler   // optional
);

<DllImport("AVIFIL32.dll", CharSet:=CharSet.Unicode, ExactSpelling:=True)>
Public Shared Function AVIStreamOpenFromFileW(
    ppavi As IntPtr,   ' IAVIStream** out
    <MarshalAs(UnmanagedType.LPWStr)> szFile As String,   ' LPCWSTR
    fccType As UInteger,   ' DWORD
    lParam As Integer,   ' INT
    mode As UInteger,   ' DWORD
    pclsidHandler As IntPtr   ' GUID* optional
) As Integer
End Function

' ppavi : IAVIStream** out
' szFile : LPCWSTR
' fccType : DWORD
' lParam : INT
' mode : DWORD
' pclsidHandler : GUID* optional
Declare PtrSafe Function AVIStreamOpenFromFileW Lib "avifil32" ( _
    ByVal ppavi As LongPtr, _
    ByVal szFile As LongPtr, _
    ByVal fccType As Long, _
    ByVal lParam As Long, _
    ByVal mode As Long, _
    ByVal pclsidHandler As LongPtr) As Long
' Unicode(W): 文字列は ByVal As LongPtr とし StrPtr(unicodeStr) を渡す
' VBA7前提(PtrSafe)。32bit Office では LongPtr→Long。Integer=16bit / Long=32bit / LongLong=64bit。

import ctypes
from ctypes import wintypes

AVIStreamOpenFromFileW = ctypes.windll.avifil32.AVIStreamOpenFromFileW
AVIStreamOpenFromFileW.restype = ctypes.c_int
AVIStreamOpenFromFileW.argtypes = [
    ctypes.c_void_p,  # ppavi : IAVIStream** out
    wintypes.LPCWSTR,  # szFile : LPCWSTR
    wintypes.DWORD,  # fccType : DWORD
    ctypes.c_int,  # lParam : INT
    wintypes.DWORD,  # mode : DWORD
    ctypes.c_void_p,  # pclsidHandler : GUID* optional
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('AVIFIL32.dll')
AVIStreamOpenFromFileW = Fiddle::Function.new(
  lib['AVIStreamOpenFromFileW'],
  [
    Fiddle::TYPE_VOIDP,  # ppavi : IAVIStream** out
    Fiddle::TYPE_VOIDP,  # szFile : LPCWSTR
    -Fiddle::TYPE_INT,  # fccType : DWORD
    Fiddle::TYPE_INT,  # lParam : INT
    -Fiddle::TYPE_INT,  # mode : DWORD
    Fiddle::TYPE_VOIDP,  # pclsidHandler : GUID* optional
  ],
  Fiddle::TYPE_INT)
# Wide strings: pass str.encode("UTF-16LE") + "\x00\x00"

#[link(name = "avifil32")]
extern "system" {
    fn AVIStreamOpenFromFileW(
        ppavi: *mut *mut core::ffi::c_void,  // IAVIStream** out
        szFile: *const u16,  // LPCWSTR
        fccType: u32,  // DWORD
        lParam: i32,  // INT
        mode: u32,  // DWORD
        pclsidHandler: *mut GUID  // GUID* optional
    ) -> i32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("AVIFIL32.dll", CharSet = CharSet.Unicode)]
public static extern int AVIStreamOpenFromFileW(IntPtr ppavi, [MarshalAs(UnmanagedType.LPWStr)] string szFile, uint fccType, int lParam, uint mode, IntPtr pclsidHandler);
"@
$api = Add-Type -MemberDefinition $sig -Name 'AVIFIL32_AVIStreamOpenFromFileW' -Namespace Win32 -PassThru
# $api::AVIStreamOpenFromFileW(ppavi, szFile, fccType, lParam, mode, pclsidHandler)

#uselib "AVIFIL32.dll"
#func global AVIStreamOpenFromFileW "AVIStreamOpenFromFileW" wptr, wptr, wptr, wptr, wptr, wptr
; AVIStreamOpenFromFileW ppavi, szFile, fccType, lParam, mode, varptr(pclsidHandler)   ; 戻り値は stat
; ppavi : IAVIStream** out -> "wptr"
; szFile : LPCWSTR -> "wptr"
; fccType : DWORD -> "wptr"
; lParam : INT -> "wptr"
; mode : DWORD -> "wptr"
; pclsidHandler : GUID* optional -> "wptr"
; ※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 "AVIFIL32.dll"
#cfunc global AVIStreamOpenFromFileW "AVIStreamOpenFromFileW" sptr, wstr, int, int, int, var
; res = AVIStreamOpenFromFileW(ppavi, szFile, fccType, lParam, mode, pclsidHandler)
; ppavi : IAVIStream** out -> "sptr"
; szFile : LPCWSTR -> "wstr"
; fccType : DWORD -> "int"
; lParam : INT -> "int"
; mode : DWORD -> "int"
; pclsidHandler : GUID* optional -> "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。

; HRESULT AVIStreamOpenFromFileW(IAVIStream** ppavi, LPCWSTR szFile, DWORD fccType, INT lParam, DWORD mode, GUID* pclsidHandler)
#uselib "AVIFIL32.dll"
#cfunc global AVIStreamOpenFromFileW "AVIStreamOpenFromFileW" intptr, wstr, int, int, int, var
; res = AVIStreamOpenFromFileW(ppavi, szFile, fccType, lParam, mode, pclsidHandler)
; ppavi : IAVIStream** out -> "intptr"
; szFile : LPCWSTR -> "wstr"
; fccType : DWORD -> "int"
; lParam : INT -> "int"
; mode : DWORD -> "int"
; pclsidHandler : GUID* optional -> "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。

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

var (
	avifil32 = windows.NewLazySystemDLL("AVIFIL32.dll")
	procAVIStreamOpenFromFileW = avifil32.NewProc("AVIStreamOpenFromFileW")
)

// ppavi (IAVIStream** out), szFile (LPCWSTR), fccType (DWORD), lParam (INT), mode (DWORD), pclsidHandler (GUID* optional)
r1, _, err := procAVIStreamOpenFromFileW.Call(
	uintptr(ppavi),
	uintptr(unsafe.Pointer(windows.StringToUTF16Ptr(szFile))),
	uintptr(fccType),
	uintptr(lParam),
	uintptr(mode),
	uintptr(pclsidHandler),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // HRESULT

function AVIStreamOpenFromFileW(
  ppavi: Pointer;   // IAVIStream** out
  szFile: PWideChar;   // LPCWSTR
  fccType: DWORD;   // DWORD
  lParam: Integer;   // INT
  mode: DWORD;   // DWORD
  pclsidHandler: PGUID   // GUID* optional
): Integer; stdcall;
  external 'AVIFIL32.dll' name 'AVIStreamOpenFromFileW';

result := DllCall("AVIFIL32\AVIStreamOpenFromFileW"
    , "Ptr", ppavi   ; IAVIStream** out
    , "WStr", szFile   ; LPCWSTR
    , "UInt", fccType   ; DWORD
    , "Int", lParam   ; INT
    , "UInt", mode   ; DWORD
    , "Ptr", pclsidHandler   ; GUID* optional
    , "Int")   ; return: HRESULT

●AVIStreamOpenFromFileW(ppavi, szFile, fccType, lParam, mode, pclsidHandler) = DLL("AVIFIL32.dll", "int AVIStreamOpenFromFileW(void*, char*, dword, int, dword, void*)")
# 呼び出し: AVIStreamOpenFromFileW(ppavi, szFile, fccType, lParam, mode, pclsidHandler)
# ppavi : IAVIStream** out -> "void*"
# szFile : LPCWSTR -> "char*"
# fccType : DWORD -> "dword"
# lParam : INT -> "int"
# mode : DWORD -> "dword"
# pclsidHandler : GUID* optional -> "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)。
# ※-W(Unicode)関数。なでしこ1はANSIのため -A 版の利用を推奨。