WNetSetLastErrorA

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

void WNetSetLastErrorA(
    DWORD err,
    LPSTR lpError,
    LPSTR lpProviders
);

<DllImport("MPR.dll", CharSet:=CharSet.Ansi, ExactSpelling:=True)>
Public Shared Sub WNetSetLastErrorA(
    err As UInteger,   ' DWORD
    <MarshalAs(UnmanagedType.LPStr)> lpError As String,   ' LPSTR
    <MarshalAs(UnmanagedType.LPStr)> lpProviders As String   ' LPSTR
)
End Sub

' err : DWORD
' lpError : LPSTR
' lpProviders : LPSTR
Declare PtrSafe Sub WNetSetLastErrorA Lib "mpr" ( _
    ByVal err As Long, _
    ByVal lpError As String, _
    ByVal lpProviders As String)
' VBA7前提(PtrSafe)。32bit Office では LongPtr→Long。Integer=16bit / Long=32bit / LongLong=64bit。

import ctypes
from ctypes import wintypes

WNetSetLastErrorA = ctypes.windll.mpr.WNetSetLastErrorA
WNetSetLastErrorA.restype = None
WNetSetLastErrorA.argtypes = [
    wintypes.DWORD,  # err : DWORD
    wintypes.LPCSTR,  # lpError : LPSTR
    wintypes.LPCSTR,  # lpProviders : LPSTR
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('MPR.dll')
WNetSetLastErrorA = Fiddle::Function.new(
  lib['WNetSetLastErrorA'],
  [
    -Fiddle::TYPE_INT,  # err : DWORD
    Fiddle::TYPE_VOIDP,  # lpError : LPSTR
    Fiddle::TYPE_VOIDP,  # lpProviders : LPSTR
  ],
  Fiddle::TYPE_VOID)

#[link(name = "mpr")]
extern "system" {
    fn WNetSetLastErrorA(
        err: u32,  // DWORD
        lpError: *mut u8,  // LPSTR
        lpProviders: *mut u8  // LPSTR
    );
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("MPR.dll", CharSet = CharSet.Ansi)]
public static extern void WNetSetLastErrorA(uint err, [MarshalAs(UnmanagedType.LPStr)] string lpError, [MarshalAs(UnmanagedType.LPStr)] string lpProviders);
"@
$api = Add-Type -MemberDefinition $sig -Name 'MPR_WNetSetLastErrorA' -Namespace Win32 -PassThru
# $api::WNetSetLastErrorA(err, lpError, lpProviders)

#uselib "MPR.dll"
#func global WNetSetLastErrorA "WNetSetLastErrorA" sptr, sptr, sptr
; WNetSetLastErrorA err, lpError, lpProviders
; err : DWORD -> "sptr"
; lpError : LPSTR -> "sptr"
; lpProviders : LPSTR -> "sptr"

#uselib "MPR.dll"
#func global WNetSetLastErrorA "WNetSetLastErrorA" int, str, str
; WNetSetLastErrorA err, lpError, lpProviders
; err : DWORD -> "int"
; lpError : LPSTR -> "str"
; lpProviders : LPSTR -> "str"

; void WNetSetLastErrorA(DWORD err, LPSTR lpError, LPSTR lpProviders)
#uselib "MPR.dll"
#func global WNetSetLastErrorA "WNetSetLastErrorA" int, str, str
; WNetSetLastErrorA err, lpError, lpProviders
; err : DWORD -> "int"
; lpError : LPSTR -> "str"
; lpProviders : LPSTR -> "str"

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

var (
	mpr = windows.NewLazySystemDLL("MPR.dll")
	procWNetSetLastErrorA = mpr.NewProc("WNetSetLastErrorA")
)

// err (DWORD), lpError (LPSTR), lpProviders (LPSTR)
r1, _, err := procWNetSetLastErrorA.Call(
	uintptr(err),
	uintptr(unsafe.Pointer(windows.BytePtrFromString(lpError))),
	uintptr(unsafe.Pointer(windows.BytePtrFromString(lpProviders))),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // void

procedure WNetSetLastErrorA(
  err: DWORD;   // DWORD
  lpError: PAnsiChar;   // LPSTR
  lpProviders: PAnsiChar   // LPSTR
); stdcall;
  external 'MPR.dll' name 'WNetSetLastErrorA';

result := DllCall("MPR\WNetSetLastErrorA"
    , "UInt", err   ; DWORD
    , "AStr", lpError   ; LPSTR
    , "AStr", lpProviders   ; LPSTR
    , "Int")   ; return: void

●WNetSetLastErrorA(err, lpError, lpProviders) = DLL("MPR.dll", "int WNetSetLastErrorA(dword, char*, char*)")
# 呼び出し: WNetSetLastErrorA(err, lpError, lpProviders)
# err : DWORD -> "dword"
# lpError : LPSTR -> "char*"
# lpProviders : LPSTR -> "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)。