StrChrNW

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

LPWSTR StrChrNW(
    LPCWSTR pszStart,
    WCHAR wMatch,
    DWORD cchMax
);

<DllImport("SHLWAPI.dll", ExactSpelling:=True)>
Public Shared Function StrChrNW(
    <MarshalAs(UnmanagedType.LPWStr)> pszStart As String,   ' LPCWSTR
    wMatch As Char,   ' WCHAR
    cchMax As UInteger   ' DWORD
) As IntPtr
End Function

' pszStart : LPCWSTR
' wMatch : WCHAR
' cchMax : DWORD
Declare PtrSafe Function StrChrNW Lib "shlwapi" ( _
    ByVal pszStart As LongPtr, _
    ByVal wMatch As Integer, _
    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

StrChrNW = ctypes.windll.shlwapi.StrChrNW
StrChrNW.restype = wintypes.LPWSTR
StrChrNW.argtypes = [
    wintypes.LPCWSTR,  # pszStart : LPCWSTR
    ctypes.c_wchar,  # wMatch : WCHAR
    wintypes.DWORD,  # cchMax : DWORD
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('SHLWAPI.dll')
StrChrNW = Fiddle::Function.new(
  lib['StrChrNW'],
  [
    Fiddle::TYPE_VOIDP,  # pszStart : LPCWSTR
    Fiddle::TYPE_SHORT,  # wMatch : WCHAR
    -Fiddle::TYPE_INT,  # cchMax : DWORD
  ],
  Fiddle::TYPE_VOIDP)

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

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

#uselib "SHLWAPI.dll"
#func global StrChrNW "StrChrNW" sptr, sptr, sptr
; StrChrNW pszStart, wMatch, cchMax   ; 戻り値は stat
; pszStart : LPCWSTR -> "sptr"
; wMatch : WCHAR -> "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 StrChrNW "StrChrNW" wstr, int, int
; res = StrChrNW(pszStart, wMatch, cchMax)
; pszStart : LPCWSTR -> "wstr"
; wMatch : WCHAR -> "int"
; cchMax : DWORD -> "int"

; LPWSTR StrChrNW(LPCWSTR pszStart, WCHAR wMatch, DWORD cchMax)
#uselib "SHLWAPI.dll"
#cfunc global StrChrNW "StrChrNW" wstr, int, int
; res = StrChrNW(pszStart, wMatch, cchMax)
; pszStart : LPCWSTR -> "wstr"
; wMatch : WCHAR -> "int"
; cchMax : DWORD -> "int"

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

var (
	shlwapi = windows.NewLazySystemDLL("SHLWAPI.dll")
	procStrChrNW = shlwapi.NewProc("StrChrNW")
)

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

function StrChrNW(
  pszStart: PWideChar;   // LPCWSTR
  wMatch: WideChar;   // WCHAR
  cchMax: DWORD   // DWORD
): PWideChar; stdcall;
  external 'SHLWAPI.dll' name 'StrChrNW';

result := DllCall("SHLWAPI\StrChrNW"
    , "WStr", pszStart   ; LPCWSTR
    , "Short", wMatch   ; WCHAR
    , "UInt", cchMax   ; DWORD
    , "Ptr")   ; return: LPWSTR

●StrChrNW(pszStart, wMatch, cchMax) = DLL("SHLWAPI.dll", "char* StrChrNW(char*, int, dword)")
# 呼び出し: StrChrNW(pszStart, wMatch, cchMax)
# pszStart : LPCWSTR -> "char*"
# wMatch : WCHAR -> "int"
# 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)。