SetDlgItemTextA

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

BOOL SetDlgItemTextA(
    HWND hDlg,
    INT nIDDlgItem,
    LPCSTR lpString
);

<DllImport("USER32.dll", CharSet:=CharSet.Ansi, SetLastError:=True, ExactSpelling:=True)>
Public Shared Function SetDlgItemTextA(
    hDlg As IntPtr,   ' HWND
    nIDDlgItem As Integer,   ' INT
    <MarshalAs(UnmanagedType.LPStr)> lpString As String   ' LPCSTR
) As Boolean
End Function

' hDlg : HWND
' nIDDlgItem : INT
' lpString : LPCSTR
Declare PtrSafe Function SetDlgItemTextA Lib "user32" ( _
    ByVal hDlg As LongPtr, _
    ByVal nIDDlgItem As Long, _
    ByVal lpString As String) As Long
' VBA7前提(PtrSafe)。32bit Office では LongPtr→Long。Integer=16bit / Long=32bit / LongLong=64bit。

import ctypes
from ctypes import wintypes

SetDlgItemTextA = ctypes.windll.user32.SetDlgItemTextA
SetDlgItemTextA.restype = wintypes.BOOL
SetDlgItemTextA.argtypes = [
    wintypes.HANDLE,  # hDlg : HWND
    ctypes.c_int,  # nIDDlgItem : INT
    wintypes.LPCSTR,  # lpString : LPCSTR
]
# GetLastError: use ctypes.GetLastError() (or ctypes.WinDLL(use_last_error=True))

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('USER32.dll')
SetDlgItemTextA = Fiddle::Function.new(
  lib['SetDlgItemTextA'],
  [
    Fiddle::TYPE_VOIDP,  # hDlg : HWND
    Fiddle::TYPE_INT,  # nIDDlgItem : INT
    Fiddle::TYPE_VOIDP,  # lpString : LPCSTR
  ],
  Fiddle::TYPE_INT)

#[link(name = "user32")]
extern "system" {
    fn SetDlgItemTextA(
        hDlg: *mut core::ffi::c_void,  // HWND
        nIDDlgItem: i32,  // INT
        lpString: *const u8  // LPCSTR
    ) -> 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 SetDlgItemTextA(IntPtr hDlg, int nIDDlgItem, [MarshalAs(UnmanagedType.LPStr)] string lpString);
"@
$api = Add-Type -MemberDefinition $sig -Name 'USER32_SetDlgItemTextA' -Namespace Win32 -PassThru
# $api::SetDlgItemTextA(hDlg, nIDDlgItem, lpString)

#uselib "USER32.dll"
#func global SetDlgItemTextA "SetDlgItemTextA" sptr, sptr, sptr
; SetDlgItemTextA hDlg, nIDDlgItem, lpString   ; 戻り値は stat
; hDlg : HWND -> "sptr"
; nIDDlgItem : INT -> "sptr"
; lpString : LPCSTR -> "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 SetDlgItemTextA "SetDlgItemTextA" sptr, int, str
; res = SetDlgItemTextA(hDlg, nIDDlgItem, lpString)
; hDlg : HWND -> "sptr"
; nIDDlgItem : INT -> "int"
; lpString : LPCSTR -> "str"

; BOOL SetDlgItemTextA(HWND hDlg, INT nIDDlgItem, LPCSTR lpString)
#uselib "USER32.dll"
#cfunc global SetDlgItemTextA "SetDlgItemTextA" intptr, int, str
; res = SetDlgItemTextA(hDlg, nIDDlgItem, lpString)
; hDlg : HWND -> "intptr"
; nIDDlgItem : INT -> "int"
; lpString : LPCSTR -> "str"

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

var (
	user32 = windows.NewLazySystemDLL("USER32.dll")
	procSetDlgItemTextA = user32.NewProc("SetDlgItemTextA")
)

// hDlg (HWND), nIDDlgItem (INT), lpString (LPCSTR)
r1, _, err := procSetDlgItemTextA.Call(
	uintptr(hDlg),
	uintptr(nIDDlgItem),
	uintptr(unsafe.Pointer(windows.BytePtrFromString(lpString))),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // BOOL

function SetDlgItemTextA(
  hDlg: THandle;   // HWND
  nIDDlgItem: Integer;   // INT
  lpString: PAnsiChar   // LPCSTR
): BOOL; stdcall;
  external 'USER32.dll' name 'SetDlgItemTextA';

result := DllCall("USER32\SetDlgItemTextA"
    , "Ptr", hDlg   ; HWND
    , "Int", nIDDlgItem   ; INT
    , "AStr", lpString   ; LPCSTR
    , "Int")   ; return: BOOL

●SetDlgItemTextA(hDlg, nIDDlgItem, lpString) = DLL("USER32.dll", "bool SetDlgItemTextA(void*, int, char*)")
# 呼び出し: SetDlgItemTextA(hDlg, nIDDlgItem, lpString)
# hDlg : HWND -> "void*"
# nIDDlgItem : INT -> "int"
# lpString : LPCSTR -> "char*"
# 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)。