LoadStringA

// USER32.dll  (ANSI / -A)
#include <windows.h>

INT LoadStringA(
    HINSTANCE hInstance,   // optional
    DWORD uID,
    LPSTR lpBuffer,
    INT cchBufferMax
);

<DllImport("USER32.dll", CharSet:=CharSet.Ansi, SetLastError:=True, ExactSpelling:=True)>
Public Shared Function LoadStringA(
    hInstance As IntPtr,   ' HINSTANCE optional
    uID As UInteger,   ' DWORD
    <MarshalAs(UnmanagedType.LPStr)> lpBuffer As System.Text.StringBuilder,   ' LPSTR out
    cchBufferMax As Integer   ' INT
) As Integer
End Function

' hInstance : HINSTANCE optional
' uID : DWORD
' lpBuffer : LPSTR out
' cchBufferMax : INT
Declare PtrSafe Function LoadStringA Lib "user32" ( _
    ByVal hInstance As LongPtr, _
    ByVal uID As Long, _
    ByVal lpBuffer As String, _
    ByVal cchBufferMax As Long) As Long
' VBA7前提(PtrSafe)。32bit Office では LongPtr→Long。Integer=16bit / Long=32bit / LongLong=64bit。

import ctypes
from ctypes import wintypes

LoadStringA = ctypes.windll.user32.LoadStringA
LoadStringA.restype = ctypes.c_int
LoadStringA.argtypes = [
    wintypes.HANDLE,  # hInstance : HINSTANCE optional
    wintypes.DWORD,  # uID : DWORD
    wintypes.LPSTR,  # lpBuffer : LPSTR out
    ctypes.c_int,  # cchBufferMax : INT
]
# GetLastError: use ctypes.GetLastError() (or ctypes.WinDLL(use_last_error=True))

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('USER32.dll')
LoadStringA = Fiddle::Function.new(
  lib['LoadStringA'],
  [
    Fiddle::TYPE_VOIDP,  # hInstance : HINSTANCE optional
    -Fiddle::TYPE_INT,  # uID : DWORD
    Fiddle::TYPE_VOIDP,  # lpBuffer : LPSTR out
    Fiddle::TYPE_INT,  # cchBufferMax : INT
  ],
  Fiddle::TYPE_INT)

#[link(name = "user32")]
extern "system" {
    fn LoadStringA(
        hInstance: *mut core::ffi::c_void,  // HINSTANCE optional
        uID: u32,  // DWORD
        lpBuffer: *mut u8,  // LPSTR out
        cchBufferMax: i32  // INT
    ) -> i32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("USER32.dll", CharSet = CharSet.Ansi, SetLastError = true)]
public static extern int LoadStringA(IntPtr hInstance, uint uID, [MarshalAs(UnmanagedType.LPStr)] System.Text.StringBuilder lpBuffer, int cchBufferMax);
"@
$api = Add-Type -MemberDefinition $sig -Name 'USER32_LoadStringA' -Namespace Win32 -PassThru
# $api::LoadStringA(hInstance, uID, lpBuffer, cchBufferMax)

#uselib "USER32.dll"
#func global LoadStringA "LoadStringA" sptr, sptr, sptr, sptr
; LoadStringA hInstance, uID, varptr(lpBuffer), cchBufferMax   ; 戻り値は stat
; hInstance : HINSTANCE optional -> "sptr"
; uID : DWORD -> "sptr"
; lpBuffer : LPSTR out -> "sptr"
; cchBufferMax : 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 "USER32.dll"
#cfunc global LoadStringA "LoadStringA" sptr, int, var, int
; res = LoadStringA(hInstance, uID, lpBuffer, cchBufferMax)
; hInstance : HINSTANCE optional -> "sptr"
; uID : DWORD -> "int"
; lpBuffer : LPSTR out -> "var"
; cchBufferMax : 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。

; INT LoadStringA(HINSTANCE hInstance, DWORD uID, LPSTR lpBuffer, INT cchBufferMax)
#uselib "USER32.dll"
#cfunc global LoadStringA "LoadStringA" intptr, int, var, int
; res = LoadStringA(hInstance, uID, lpBuffer, cchBufferMax)
; hInstance : HINSTANCE optional -> "intptr"
; uID : DWORD -> "int"
; lpBuffer : LPSTR out -> "var"
; cchBufferMax : 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 (
	user32 = windows.NewLazySystemDLL("USER32.dll")
	procLoadStringA = user32.NewProc("LoadStringA")
)

// hInstance (HINSTANCE optional), uID (DWORD), lpBuffer (LPSTR out), cchBufferMax (INT)
r1, _, err := procLoadStringA.Call(
	uintptr(hInstance),
	uintptr(uID),
	uintptr(lpBuffer),
	uintptr(cchBufferMax),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // INT

function LoadStringA(
  hInstance: THandle;   // HINSTANCE optional
  uID: DWORD;   // DWORD
  lpBuffer: PAnsiChar;   // LPSTR out
  cchBufferMax: Integer   // INT
): Integer; stdcall;
  external 'USER32.dll' name 'LoadStringA';

result := DllCall("USER32\LoadStringA"
    , "Ptr", hInstance   ; HINSTANCE optional
    , "UInt", uID   ; DWORD
    , "Ptr", lpBuffer   ; LPSTR out
    , "Int", cchBufferMax   ; INT
    , "Int")   ; return: INT

●LoadStringA(hInstance, uID, lpBuffer, cchBufferMax) = DLL("USER32.dll", "int LoadStringA(void*, dword, char*, int)")
# 呼び出し: LoadStringA(hInstance, uID, lpBuffer, cchBufferMax)
# hInstance : HINSTANCE optional -> "void*"
# uID : DWORD -> "dword"
# lpBuffer : LPSTR out -> "char*"
# cchBufferMax : 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)。