GetKeyNameTextA

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

INT GetKeyNameTextA(
    INT lParam,
    LPSTR lpString,
    INT cchSize
);

<DllImport("USER32.dll", CharSet:=CharSet.Ansi, SetLastError:=True, ExactSpelling:=True)>
Public Shared Function GetKeyNameTextA(
    lParam As Integer,   ' INT
    <MarshalAs(UnmanagedType.LPStr)> lpString As System.Text.StringBuilder,   ' LPSTR out
    cchSize As Integer   ' INT
) As Integer
End Function

' lParam : INT
' lpString : LPSTR out
' cchSize : INT
Declare PtrSafe Function GetKeyNameTextA Lib "user32" ( _
    ByVal lParam As Long, _
    ByVal lpString As String, _
    ByVal cchSize 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

GetKeyNameTextA = ctypes.windll.user32.GetKeyNameTextA
GetKeyNameTextA.restype = ctypes.c_int
GetKeyNameTextA.argtypes = [
    ctypes.c_int,  # lParam : INT
    wintypes.LPSTR,  # lpString : LPSTR out
    ctypes.c_int,  # cchSize : INT
]
# GetLastError: use ctypes.GetLastError() (or ctypes.WinDLL(use_last_error=True))

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('USER32.dll')
GetKeyNameTextA = Fiddle::Function.new(
  lib['GetKeyNameTextA'],
  [
    Fiddle::TYPE_INT,  # lParam : INT
    Fiddle::TYPE_VOIDP,  # lpString : LPSTR out
    Fiddle::TYPE_INT,  # cchSize : INT
  ],
  Fiddle::TYPE_INT)

#[link(name = "user32")]
extern "system" {
    fn GetKeyNameTextA(
        lParam: i32,  // INT
        lpString: *mut u8,  // LPSTR out
        cchSize: 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 GetKeyNameTextA(int lParam, [MarshalAs(UnmanagedType.LPStr)] System.Text.StringBuilder lpString, int cchSize);
"@
$api = Add-Type -MemberDefinition $sig -Name 'USER32_GetKeyNameTextA' -Namespace Win32 -PassThru
# $api::GetKeyNameTextA(lParam, lpString, cchSize)

#uselib "USER32.dll"
#func global GetKeyNameTextA "GetKeyNameTextA" sptr, sptr, sptr
; GetKeyNameTextA lParam, varptr(lpString), cchSize   ; 戻り値は stat
; lParam : INT -> "sptr"
; lpString : LPSTR out -> "sptr"
; cchSize : 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 GetKeyNameTextA "GetKeyNameTextA" int, var, int
; res = GetKeyNameTextA(lParam, lpString, cchSize)
; lParam : INT -> "int"
; lpString : LPSTR out -> "var"
; cchSize : 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 GetKeyNameTextA(INT lParam, LPSTR lpString, INT cchSize)
#uselib "USER32.dll"
#cfunc global GetKeyNameTextA "GetKeyNameTextA" int, var, int
; res = GetKeyNameTextA(lParam, lpString, cchSize)
; lParam : INT -> "int"
; lpString : LPSTR out -> "var"
; cchSize : 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")
	procGetKeyNameTextA = user32.NewProc("GetKeyNameTextA")
)

// lParam (INT), lpString (LPSTR out), cchSize (INT)
r1, _, err := procGetKeyNameTextA.Call(
	uintptr(lParam),
	uintptr(lpString),
	uintptr(cchSize),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // INT

function GetKeyNameTextA(
  lParam: Integer;   // INT
  lpString: PAnsiChar;   // LPSTR out
  cchSize: Integer   // INT
): Integer; stdcall;
  external 'USER32.dll' name 'GetKeyNameTextA';

result := DllCall("USER32\GetKeyNameTextA"
    , "Int", lParam   ; INT
    , "Ptr", lpString   ; LPSTR out
    , "Int", cchSize   ; INT
    , "Int")   ; return: INT

●GetKeyNameTextA(lParam, lpString, cchSize) = DLL("USER32.dll", "int GetKeyNameTextA(int, char*, int)")
# 呼び出し: GetKeyNameTextA(lParam, lpString, cchSize)
# lParam : INT -> "int"
# lpString : LPSTR out -> "char*"
# cchSize : 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)。