SetPropA

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

BOOL SetPropA(
    HWND hWnd,
    LPCSTR lpString,
    HANDLE hData   // optional
);

<DllImport("USER32.dll", CharSet:=CharSet.Ansi, SetLastError:=True, ExactSpelling:=True)>
Public Shared Function SetPropA(
    hWnd As IntPtr,   ' HWND
    <MarshalAs(UnmanagedType.LPStr)> lpString As String,   ' LPCSTR
    hData As IntPtr   ' HANDLE optional
) As Boolean
End Function

' hWnd : HWND
' lpString : LPCSTR
' hData : HANDLE optional
Declare PtrSafe Function SetPropA Lib "user32" ( _
    ByVal hWnd As LongPtr, _
    ByVal lpString As String, _
    ByVal hData As LongPtr) As Long
' VBA7前提(PtrSafe)。32bit Office では LongPtr→Long。Integer=16bit / Long=32bit / LongLong=64bit。

import ctypes
from ctypes import wintypes

SetPropA = ctypes.windll.user32.SetPropA
SetPropA.restype = wintypes.BOOL
SetPropA.argtypes = [
    wintypes.HANDLE,  # hWnd : HWND
    wintypes.LPCSTR,  # lpString : LPCSTR
    wintypes.HANDLE,  # hData : HANDLE optional
]
# GetLastError: use ctypes.GetLastError() (or ctypes.WinDLL(use_last_error=True))

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('USER32.dll')
SetPropA = Fiddle::Function.new(
  lib['SetPropA'],
  [
    Fiddle::TYPE_VOIDP,  # hWnd : HWND
    Fiddle::TYPE_VOIDP,  # lpString : LPCSTR
    Fiddle::TYPE_VOIDP,  # hData : HANDLE optional
  ],
  Fiddle::TYPE_INT)

#[link(name = "user32")]
extern "system" {
    fn SetPropA(
        hWnd: *mut core::ffi::c_void,  // HWND
        lpString: *const u8,  // LPCSTR
        hData: *mut core::ffi::c_void  // HANDLE optional
    ) -> i32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[return: MarshalAs(UnmanagedType.Bool)]
[DllImport("USER32.dll", CharSet = CharSet.Ansi, SetLastError = true)]
public static extern bool SetPropA(IntPtr hWnd, [MarshalAs(UnmanagedType.LPStr)] string lpString, IntPtr hData);
"@
$api = Add-Type -MemberDefinition $sig -Name 'USER32_SetPropA' -Namespace Win32 -PassThru
# $api::SetPropA(hWnd, lpString, hData)

#uselib "USER32.dll"
#func global SetPropA "SetPropA" sptr, sptr, sptr
; SetPropA hWnd, lpString, hData   ; 戻り値は stat
; hWnd : HWND -> "sptr"
; lpString : LPCSTR -> "sptr"
; hData : HANDLE optional -> "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 SetPropA "SetPropA" sptr, str, sptr
; res = SetPropA(hWnd, lpString, hData)
; hWnd : HWND -> "sptr"
; lpString : LPCSTR -> "str"
; hData : HANDLE optional -> "sptr"

; BOOL SetPropA(HWND hWnd, LPCSTR lpString, HANDLE hData)
#uselib "USER32.dll"
#cfunc global SetPropA "SetPropA" intptr, str, intptr
; res = SetPropA(hWnd, lpString, hData)
; hWnd : HWND -> "intptr"
; lpString : LPCSTR -> "str"
; hData : HANDLE optional -> "intptr"

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

var (
	user32 = windows.NewLazySystemDLL("USER32.dll")
	procSetPropA = user32.NewProc("SetPropA")
)

// hWnd (HWND), lpString (LPCSTR), hData (HANDLE optional)
r1, _, err := procSetPropA.Call(
	uintptr(hWnd),
	uintptr(unsafe.Pointer(windows.BytePtrFromString(lpString))),
	uintptr(hData),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // BOOL

function SetPropA(
  hWnd: THandle;   // HWND
  lpString: PAnsiChar;   // LPCSTR
  hData: THandle   // HANDLE optional
): BOOL; stdcall;
  external 'USER32.dll' name 'SetPropA';

result := DllCall("USER32\SetPropA"
    , "Ptr", hWnd   ; HWND
    , "AStr", lpString   ; LPCSTR
    , "Ptr", hData   ; HANDLE optional
    , "Int")   ; return: BOOL

●SetPropA(hWnd, lpString, hData) = DLL("USER32.dll", "bool SetPropA(void*, char*, void*)")
# 呼び出し: SetPropA(hWnd, lpString, hData)
# hWnd : HWND -> "void*"
# lpString : LPCSTR -> "char*"
# hData : HANDLE optional -> "void*"
# 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)。