WNetGetUserA

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

WIN32_ERROR WNetGetUserA(
    LPCSTR lpName,   // optional
    LPSTR lpUserName,
    DWORD* lpnLength
);

<DllImport("MPR.dll", CharSet:=CharSet.Ansi, ExactSpelling:=True)>
Public Shared Function WNetGetUserA(
    <MarshalAs(UnmanagedType.LPStr)> lpName As String,   ' LPCSTR optional
    <MarshalAs(UnmanagedType.LPStr)> lpUserName As System.Text.StringBuilder,   ' LPSTR out
    ByRef lpnLength As UInteger   ' DWORD* in/out
) As UInteger
End Function

' lpName : LPCSTR optional
' lpUserName : LPSTR out
' lpnLength : DWORD* in/out
Declare PtrSafe Function WNetGetUserA Lib "mpr" ( _
    ByVal lpName As String, _
    ByVal lpUserName As String, _
    ByRef lpnLength 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

WNetGetUserA = ctypes.windll.mpr.WNetGetUserA
WNetGetUserA.restype = wintypes.DWORD
WNetGetUserA.argtypes = [
    wintypes.LPCSTR,  # lpName : LPCSTR optional
    wintypes.LPSTR,  # lpUserName : LPSTR out
    ctypes.POINTER(wintypes.DWORD),  # lpnLength : DWORD* in/out
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('MPR.dll')
WNetGetUserA = Fiddle::Function.new(
  lib['WNetGetUserA'],
  [
    Fiddle::TYPE_VOIDP,  # lpName : LPCSTR optional
    Fiddle::TYPE_VOIDP,  # lpUserName : LPSTR out
    Fiddle::TYPE_VOIDP,  # lpnLength : DWORD* in/out
  ],
  -Fiddle::TYPE_INT)

#[link(name = "mpr")]
extern "system" {
    fn WNetGetUserA(
        lpName: *const u8,  // LPCSTR optional
        lpUserName: *mut u8,  // LPSTR out
        lpnLength: *mut u32  // DWORD* in/out
    ) -> u32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("MPR.dll", CharSet = CharSet.Ansi)]
public static extern uint WNetGetUserA([MarshalAs(UnmanagedType.LPStr)] string lpName, [MarshalAs(UnmanagedType.LPStr)] System.Text.StringBuilder lpUserName, ref uint lpnLength);
"@
$api = Add-Type -MemberDefinition $sig -Name 'MPR_WNetGetUserA' -Namespace Win32 -PassThru
# $api::WNetGetUserA(lpName, lpUserName, lpnLength)

#uselib "MPR.dll"
#func global WNetGetUserA "WNetGetUserA" sptr, sptr, sptr
; WNetGetUserA lpName, varptr(lpUserName), varptr(lpnLength)   ; 戻り値は stat
; lpName : LPCSTR optional -> "sptr"
; lpUserName : LPSTR out -> "sptr"
; lpnLength : DWORD* in/out -> "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 "MPR.dll"
#cfunc global WNetGetUserA "WNetGetUserA" str, var, var
; res = WNetGetUserA(lpName, lpUserName, lpnLength)
; lpName : LPCSTR optional -> "str"
; lpUserName : LPSTR out -> "var"
; lpnLength : DWORD* in/out -> "var"
; ※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。

; WIN32_ERROR WNetGetUserA(LPCSTR lpName, LPSTR lpUserName, DWORD* lpnLength)
#uselib "MPR.dll"
#cfunc global WNetGetUserA "WNetGetUserA" str, var, var
; res = WNetGetUserA(lpName, lpUserName, lpnLength)
; lpName : LPCSTR optional -> "str"
; lpUserName : LPSTR out -> "var"
; lpnLength : DWORD* in/out -> "var"
; ※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 (
	mpr = windows.NewLazySystemDLL("MPR.dll")
	procWNetGetUserA = mpr.NewProc("WNetGetUserA")
)

// lpName (LPCSTR optional), lpUserName (LPSTR out), lpnLength (DWORD* in/out)
r1, _, err := procWNetGetUserA.Call(
	uintptr(unsafe.Pointer(windows.BytePtrFromString(lpName))),
	uintptr(lpUserName),
	uintptr(lpnLength),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // WIN32_ERROR

function WNetGetUserA(
  lpName: PAnsiChar;   // LPCSTR optional
  lpUserName: PAnsiChar;   // LPSTR out
  lpnLength: Pointer   // DWORD* in/out
): DWORD; stdcall;
  external 'MPR.dll' name 'WNetGetUserA';

result := DllCall("MPR\WNetGetUserA"
    , "AStr", lpName   ; LPCSTR optional
    , "Ptr", lpUserName   ; LPSTR out
    , "Ptr", lpnLength   ; DWORD* in/out
    , "UInt")   ; return: WIN32_ERROR

●WNetGetUserA(lpName, lpUserName, lpnLength) = DLL("MPR.dll", "dword WNetGetUserA(char*, char*, void*)")
# 呼び出し: WNetGetUserA(lpName, lpUserName, lpnLength)
# lpName : LPCSTR optional -> "char*"
# lpUserName : LPSTR out -> "char*"
# lpnLength : DWORD* in/out -> "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)。