StrStrNW

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

LPWSTR StrStrNW(
    LPCWSTR pszFirst,
    LPCWSTR pszSrch,
    DWORD cchMax
);

<DllImport("SHLWAPI.dll", ExactSpelling:=True)>
Public Shared Function StrStrNW(
    <MarshalAs(UnmanagedType.LPWStr)> pszFirst As String,   ' LPCWSTR
    <MarshalAs(UnmanagedType.LPWStr)> pszSrch As String,   ' LPCWSTR
    cchMax As UInteger   ' DWORD
) As IntPtr
End Function

' pszFirst : LPCWSTR
' pszSrch : LPCWSTR
' cchMax : DWORD
Declare PtrSafe Function StrStrNW Lib "shlwapi" ( _
    ByVal pszFirst As LongPtr, _
    ByVal pszSrch As LongPtr, _
    ByVal cchMax As Long) As LongPtr
' VBA7前提(PtrSafe)。32bit Office では LongPtr→Long。Integer=16bit / Long=32bit / LongLong=64bit。

import ctypes
from ctypes import wintypes

StrStrNW = ctypes.windll.shlwapi.StrStrNW
StrStrNW.restype = wintypes.LPWSTR
StrStrNW.argtypes = [
    wintypes.LPCWSTR,  # pszFirst : LPCWSTR
    wintypes.LPCWSTR,  # pszSrch : LPCWSTR
    wintypes.DWORD,  # cchMax : DWORD
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('SHLWAPI.dll')
StrStrNW = Fiddle::Function.new(
  lib['StrStrNW'],
  [
    Fiddle::TYPE_VOIDP,  # pszFirst : LPCWSTR
    Fiddle::TYPE_VOIDP,  # pszSrch : LPCWSTR
    -Fiddle::TYPE_INT,  # cchMax : DWORD
  ],
  Fiddle::TYPE_VOIDP)

#[link(name = "shlwapi")]
extern "system" {
    fn StrStrNW(
        pszFirst: *const u16,  // LPCWSTR
        pszSrch: *const u16,  // LPCWSTR
        cchMax: u32  // DWORD
    ) -> *mut u16;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("SHLWAPI.dll")]
public static extern IntPtr StrStrNW([MarshalAs(UnmanagedType.LPWStr)] string pszFirst, [MarshalAs(UnmanagedType.LPWStr)] string pszSrch, uint cchMax);
"@
$api = Add-Type -MemberDefinition $sig -Name 'SHLWAPI_StrStrNW' -Namespace Win32 -PassThru
# $api::StrStrNW(pszFirst, pszSrch, cchMax)

#uselib "SHLWAPI.dll"
#func global StrStrNW "StrStrNW" sptr, sptr, sptr
; StrStrNW pszFirst, pszSrch, cchMax   ; 戻り値は stat
; pszFirst : LPCWSTR -> "sptr"
; pszSrch : LPCWSTR -> "sptr"
; cchMax : DWORD -> "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 "SHLWAPI.dll"
#cfunc global StrStrNW "StrStrNW" wstr, wstr, int
; res = StrStrNW(pszFirst, pszSrch, cchMax)
; pszFirst : LPCWSTR -> "wstr"
; pszSrch : LPCWSTR -> "wstr"
; cchMax : DWORD -> "int"

; LPWSTR StrStrNW(LPCWSTR pszFirst, LPCWSTR pszSrch, DWORD cchMax)
#uselib "SHLWAPI.dll"
#cfunc global StrStrNW "StrStrNW" wstr, wstr, int
; res = StrStrNW(pszFirst, pszSrch, cchMax)
; pszFirst : LPCWSTR -> "wstr"
; pszSrch : LPCWSTR -> "wstr"
; cchMax : DWORD -> "int"

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

var (
	shlwapi = windows.NewLazySystemDLL("SHLWAPI.dll")
	procStrStrNW = shlwapi.NewProc("StrStrNW")
)

// pszFirst (LPCWSTR), pszSrch (LPCWSTR), cchMax (DWORD)
r1, _, err := procStrStrNW.Call(
	uintptr(unsafe.Pointer(windows.StringToUTF16Ptr(pszFirst))),
	uintptr(unsafe.Pointer(windows.StringToUTF16Ptr(pszSrch))),
	uintptr(cchMax),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // LPWSTR

function StrStrNW(
  pszFirst: PWideChar;   // LPCWSTR
  pszSrch: PWideChar;   // LPCWSTR
  cchMax: DWORD   // DWORD
): PWideChar; stdcall;
  external 'SHLWAPI.dll' name 'StrStrNW';

result := DllCall("SHLWAPI\StrStrNW"
    , "WStr", pszFirst   ; LPCWSTR
    , "WStr", pszSrch   ; LPCWSTR
    , "UInt", cchMax   ; DWORD
    , "Ptr")   ; return: LPWSTR

●StrStrNW(pszFirst, pszSrch, cchMax) = DLL("SHLWAPI.dll", "char* StrStrNW(char*, char*, dword)")
# 呼び出し: StrStrNW(pszFirst, pszSrch, cchMax)
# pszFirst : LPCWSTR -> "char*"
# pszSrch : LPCWSTR -> "char*"
# cchMax : DWORD -> "dword"
# 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)。