StrNCatA

// SHLWAPI.dll  (ANSI / -A)
#include <windows.h>

LPSTR StrNCatA(
    LPSTR psz1,
    LPCSTR psz2,
    INT cchMax
);

<DllImport("SHLWAPI.dll", CharSet:=CharSet.Ansi, ExactSpelling:=True)>
Public Shared Function StrNCatA(
    <MarshalAs(UnmanagedType.LPStr)> psz1 As System.Text.StringBuilder,   ' LPSTR in/out
    <MarshalAs(UnmanagedType.LPStr)> psz2 As String,   ' LPCSTR
    cchMax As Integer   ' INT
) As IntPtr
End Function

' psz1 : LPSTR in/out
' psz2 : LPCSTR
' cchMax : INT
Declare PtrSafe Function StrNCatA Lib "shlwapi" ( _
    ByVal psz1 As String, _
    ByVal psz2 As String, _
    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

StrNCatA = ctypes.windll.shlwapi.StrNCatA
StrNCatA.restype = wintypes.LPSTR
StrNCatA.argtypes = [
    wintypes.LPSTR,  # psz1 : LPSTR in/out
    wintypes.LPCSTR,  # psz2 : LPCSTR
    ctypes.c_int,  # cchMax : INT
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('SHLWAPI.dll')
StrNCatA = Fiddle::Function.new(
  lib['StrNCatA'],
  [
    Fiddle::TYPE_VOIDP,  # psz1 : LPSTR in/out
    Fiddle::TYPE_VOIDP,  # psz2 : LPCSTR
    Fiddle::TYPE_INT,  # cchMax : INT
  ],
  Fiddle::TYPE_VOIDP)

#[link(name = "shlwapi")]
extern "system" {
    fn StrNCatA(
        psz1: *mut u8,  // LPSTR in/out
        psz2: *const u8,  // LPCSTR
        cchMax: i32  // INT
    ) -> *mut u8;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("SHLWAPI.dll", CharSet = CharSet.Ansi)]
public static extern IntPtr StrNCatA([MarshalAs(UnmanagedType.LPStr)] System.Text.StringBuilder psz1, [MarshalAs(UnmanagedType.LPStr)] string psz2, int cchMax);
"@
$api = Add-Type -MemberDefinition $sig -Name 'SHLWAPI_StrNCatA' -Namespace Win32 -PassThru
# $api::StrNCatA(psz1, psz2, cchMax)

#uselib "SHLWAPI.dll"
#func global StrNCatA "StrNCatA" sptr, sptr, sptr
; StrNCatA varptr(psz1), psz2, cchMax   ; 戻り値は stat
; psz1 : LPSTR in/out -> "sptr"
; psz2 : LPCSTR -> "sptr"
; cchMax : INT -> "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 StrNCatA "StrNCatA" var, str, int
; res = StrNCatA(psz1, psz2, cchMax)
; psz1 : LPSTR in/out -> "var"
; psz2 : LPCSTR -> "str"
; cchMax : INT -> "int"
; ※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。

; LPSTR StrNCatA(LPSTR psz1, LPCSTR psz2, INT cchMax)
#uselib "SHLWAPI.dll"
#cfunc global StrNCatA "StrNCatA" var, str, int
; res = StrNCatA(psz1, psz2, cchMax)
; psz1 : LPSTR in/out -> "var"
; psz2 : LPCSTR -> "str"
; cchMax : INT -> "int"
; ※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 (
	shlwapi = windows.NewLazySystemDLL("SHLWAPI.dll")
	procStrNCatA = shlwapi.NewProc("StrNCatA")
)

// psz1 (LPSTR in/out), psz2 (LPCSTR), cchMax (INT)
r1, _, err := procStrNCatA.Call(
	uintptr(psz1),
	uintptr(unsafe.Pointer(windows.BytePtrFromString(psz2))),
	uintptr(cchMax),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // LPSTR

function StrNCatA(
  psz1: PAnsiChar;   // LPSTR in/out
  psz2: PAnsiChar;   // LPCSTR
  cchMax: Integer   // INT
): PAnsiChar; stdcall;
  external 'SHLWAPI.dll' name 'StrNCatA';

result := DllCall("SHLWAPI\StrNCatA"
    , "Ptr", psz1   ; LPSTR in/out
    , "AStr", psz2   ; LPCSTR
    , "Int", cchMax   ; INT
    , "Ptr")   ; return: LPSTR

●StrNCatA(psz1, psz2, cchMax) = DLL("SHLWAPI.dll", "char* StrNCatA(char*, char*, int)")
# 呼び出し: StrNCatA(psz1, psz2, cchMax)
# psz1 : LPSTR in/out -> "char*"
# psz2 : LPCSTR -> "char*"
# cchMax : INT -> "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)。