SetDefaultPrinterA

// winspool.drv  (ANSI / -A)
#include <windows.h>

BOOL SetDefaultPrinterA(
    LPCSTR pszPrinter   // optional
);

<DllImport("winspool.drv", CharSet:=CharSet.Ansi, ExactSpelling:=True)>
Public Shared Function SetDefaultPrinterA(
    <MarshalAs(UnmanagedType.LPStr)> pszPrinter As String   ' LPCSTR optional
) As Boolean
End Function

' pszPrinter : LPCSTR optional
Declare PtrSafe Function SetDefaultPrinterA Lib "winspool.drv" ( _
    ByVal pszPrinter 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

SetDefaultPrinterA = ctypes.windll.LoadLibrary("winspool.drv").SetDefaultPrinterA
SetDefaultPrinterA.restype = wintypes.BOOL
SetDefaultPrinterA.argtypes = [
    wintypes.LPCSTR,  # pszPrinter : LPCSTR optional
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('winspool.drv')
SetDefaultPrinterA = Fiddle::Function.new(
  lib['SetDefaultPrinterA'],
  [
    Fiddle::TYPE_VOIDP,  # pszPrinter : LPCSTR optional
  ],
  Fiddle::TYPE_INT)

#[link(name = "winspool.drv")]
extern "system" {
    fn SetDefaultPrinterA(
        pszPrinter: *const u8  // LPCSTR optional
    ) -> i32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[return: MarshalAs(UnmanagedType.Bool)]
[DllImport("winspool.drv", CharSet = CharSet.Ansi)]
public static extern bool SetDefaultPrinterA([MarshalAs(UnmanagedType.LPStr)] string pszPrinter);
"@
$api = Add-Type -MemberDefinition $sig -Name 'winspool.drv_SetDefaultPrinterA' -Namespace Win32 -PassThru
# $api::SetDefaultPrinterA(pszPrinter)

#uselib "winspool.drv"
#func global SetDefaultPrinterA "SetDefaultPrinterA" sptr
; SetDefaultPrinterA pszPrinter   ; 戻り値は stat
; pszPrinter : LPCSTR 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 "winspool.drv"
#cfunc global SetDefaultPrinterA "SetDefaultPrinterA" str
; res = SetDefaultPrinterA(pszPrinter)
; pszPrinter : LPCSTR optional -> "str"

; BOOL SetDefaultPrinterA(LPCSTR pszPrinter)
#uselib "winspool.drv"
#cfunc global SetDefaultPrinterA "SetDefaultPrinterA" str
; res = SetDefaultPrinterA(pszPrinter)
; pszPrinter : LPCSTR optional -> "str"

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

var (
	winspool_drv = windows.NewLazySystemDLL("winspool.drv")
	procSetDefaultPrinterA = winspool_drv.NewProc("SetDefaultPrinterA")
)

// pszPrinter (LPCSTR optional)
r1, _, err := procSetDefaultPrinterA.Call(
	uintptr(unsafe.Pointer(windows.BytePtrFromString(pszPrinter))),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // BOOL

function SetDefaultPrinterA(
  pszPrinter: PAnsiChar   // LPCSTR optional
): BOOL; stdcall;
  external 'winspool.drv' name 'SetDefaultPrinterA';

result := DllCall("winspool.drv\SetDefaultPrinterA"
    , "AStr", pszPrinter   ; LPCSTR optional
    , "Int")   ; return: BOOL

●SetDefaultPrinterA(pszPrinter) = DLL("winspool.drv", "bool SetDefaultPrinterA(char*)")
# 呼び出し: SetDefaultPrinterA(pszPrinter)
# pszPrinter : LPCSTR optional -> "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)。