StrCatBuffA

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

LPSTR StrCatBuffA(
    LPSTR pszDest,
    LPCSTR pszSrc,
    INT cchDestBuffSize
);

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

' pszDest : LPSTR in/out
' pszSrc : LPCSTR
' cchDestBuffSize : INT
Declare PtrSafe Function StrCatBuffA Lib "shlwapi" ( _
    ByVal pszDest As String, _
    ByVal pszSrc As String, _
    ByVal cchDestBuffSize 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

StrCatBuffA = ctypes.windll.shlwapi.StrCatBuffA
StrCatBuffA.restype = wintypes.LPSTR
StrCatBuffA.argtypes = [
    wintypes.LPSTR,  # pszDest : LPSTR in/out
    wintypes.LPCSTR,  # pszSrc : LPCSTR
    ctypes.c_int,  # cchDestBuffSize : INT
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('SHLWAPI.dll')
StrCatBuffA = Fiddle::Function.new(
  lib['StrCatBuffA'],
  [
    Fiddle::TYPE_VOIDP,  # pszDest : LPSTR in/out
    Fiddle::TYPE_VOIDP,  # pszSrc : LPCSTR
    Fiddle::TYPE_INT,  # cchDestBuffSize : INT
  ],
  Fiddle::TYPE_VOIDP)

#[link(name = "shlwapi")]
extern "system" {
    fn StrCatBuffA(
        pszDest: *mut u8,  // LPSTR in/out
        pszSrc: *const u8,  // LPCSTR
        cchDestBuffSize: 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 StrCatBuffA([MarshalAs(UnmanagedType.LPStr)] System.Text.StringBuilder pszDest, [MarshalAs(UnmanagedType.LPStr)] string pszSrc, int cchDestBuffSize);
"@
$api = Add-Type -MemberDefinition $sig -Name 'SHLWAPI_StrCatBuffA' -Namespace Win32 -PassThru
# $api::StrCatBuffA(pszDest, pszSrc, cchDestBuffSize)

#uselib "SHLWAPI.dll"
#func global StrCatBuffA "StrCatBuffA" sptr, sptr, sptr
; StrCatBuffA varptr(pszDest), pszSrc, cchDestBuffSize   ; 戻り値は stat
; pszDest : LPSTR in/out -> "sptr"
; pszSrc : LPCSTR -> "sptr"
; cchDestBuffSize : 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 StrCatBuffA "StrCatBuffA" var, str, int
; res = StrCatBuffA(pszDest, pszSrc, cchDestBuffSize)
; pszDest : LPSTR in/out -> "var"
; pszSrc : LPCSTR -> "str"
; cchDestBuffSize : 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 StrCatBuffA(LPSTR pszDest, LPCSTR pszSrc, INT cchDestBuffSize)
#uselib "SHLWAPI.dll"
#cfunc global StrCatBuffA "StrCatBuffA" var, str, int
; res = StrCatBuffA(pszDest, pszSrc, cchDestBuffSize)
; pszDest : LPSTR in/out -> "var"
; pszSrc : LPCSTR -> "str"
; cchDestBuffSize : 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")
	procStrCatBuffA = shlwapi.NewProc("StrCatBuffA")
)

// pszDest (LPSTR in/out), pszSrc (LPCSTR), cchDestBuffSize (INT)
r1, _, err := procStrCatBuffA.Call(
	uintptr(pszDest),
	uintptr(unsafe.Pointer(windows.BytePtrFromString(pszSrc))),
	uintptr(cchDestBuffSize),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // LPSTR

function StrCatBuffA(
  pszDest: PAnsiChar;   // LPSTR in/out
  pszSrc: PAnsiChar;   // LPCSTR
  cchDestBuffSize: Integer   // INT
): PAnsiChar; stdcall;
  external 'SHLWAPI.dll' name 'StrCatBuffA';

result := DllCall("SHLWAPI\StrCatBuffA"
    , "Ptr", pszDest   ; LPSTR in/out
    , "AStr", pszSrc   ; LPCSTR
    , "Int", cchDestBuffSize   ; INT
    , "Ptr")   ; return: LPSTR

●StrCatBuffA(pszDest, pszSrc, cchDestBuffSize) = DLL("SHLWAPI.dll", "char* StrCatBuffA(char*, char*, int)")
# 呼び出し: StrCatBuffA(pszDest, pszSrc, cchDestBuffSize)
# pszDest : LPSTR in/out -> "char*"
# pszSrc : LPCSTR -> "char*"
# cchDestBuffSize : 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)。