WNetGetProviderNameA

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

WIN32_ERROR WNetGetProviderNameA(
    DWORD dwNetType,
    LPSTR lpProviderName,
    DWORD* lpBufferSize
);

<DllImport("MPR.dll", CharSet:=CharSet.Ansi, ExactSpelling:=True)>
Public Shared Function WNetGetProviderNameA(
    dwNetType As UInteger,   ' DWORD
    <MarshalAs(UnmanagedType.LPStr)> lpProviderName As System.Text.StringBuilder,   ' LPSTR out
    ByRef lpBufferSize As UInteger   ' DWORD* in/out
) As UInteger
End Function

' dwNetType : DWORD
' lpProviderName : LPSTR out
' lpBufferSize : DWORD* in/out
Declare PtrSafe Function WNetGetProviderNameA Lib "mpr" ( _
    ByVal dwNetType As Long, _
    ByVal lpProviderName As String, _
    ByRef lpBufferSize 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

WNetGetProviderNameA = ctypes.windll.mpr.WNetGetProviderNameA
WNetGetProviderNameA.restype = wintypes.DWORD
WNetGetProviderNameA.argtypes = [
    wintypes.DWORD,  # dwNetType : DWORD
    wintypes.LPSTR,  # lpProviderName : LPSTR out
    ctypes.POINTER(wintypes.DWORD),  # lpBufferSize : DWORD* in/out
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('MPR.dll')
WNetGetProviderNameA = Fiddle::Function.new(
  lib['WNetGetProviderNameA'],
  [
    -Fiddle::TYPE_INT,  # dwNetType : DWORD
    Fiddle::TYPE_VOIDP,  # lpProviderName : LPSTR out
    Fiddle::TYPE_VOIDP,  # lpBufferSize : DWORD* in/out
  ],
  -Fiddle::TYPE_INT)

#[link(name = "mpr")]
extern "system" {
    fn WNetGetProviderNameA(
        dwNetType: u32,  // DWORD
        lpProviderName: *mut u8,  // LPSTR out
        lpBufferSize: *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 WNetGetProviderNameA(uint dwNetType, [MarshalAs(UnmanagedType.LPStr)] System.Text.StringBuilder lpProviderName, ref uint lpBufferSize);
"@
$api = Add-Type -MemberDefinition $sig -Name 'MPR_WNetGetProviderNameA' -Namespace Win32 -PassThru
# $api::WNetGetProviderNameA(dwNetType, lpProviderName, lpBufferSize)

#uselib "MPR.dll"
#func global WNetGetProviderNameA "WNetGetProviderNameA" sptr, sptr, sptr
; WNetGetProviderNameA dwNetType, varptr(lpProviderName), varptr(lpBufferSize)   ; 戻り値は stat
; dwNetType : DWORD -> "sptr"
; lpProviderName : LPSTR out -> "sptr"
; lpBufferSize : 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 WNetGetProviderNameA "WNetGetProviderNameA" int, var, var
; res = WNetGetProviderNameA(dwNetType, lpProviderName, lpBufferSize)
; dwNetType : DWORD -> "int"
; lpProviderName : LPSTR out -> "var"
; lpBufferSize : 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 WNetGetProviderNameA(DWORD dwNetType, LPSTR lpProviderName, DWORD* lpBufferSize)
#uselib "MPR.dll"
#cfunc global WNetGetProviderNameA "WNetGetProviderNameA" int, var, var
; res = WNetGetProviderNameA(dwNetType, lpProviderName, lpBufferSize)
; dwNetType : DWORD -> "int"
; lpProviderName : LPSTR out -> "var"
; lpBufferSize : 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")
	procWNetGetProviderNameA = mpr.NewProc("WNetGetProviderNameA")
)

// dwNetType (DWORD), lpProviderName (LPSTR out), lpBufferSize (DWORD* in/out)
r1, _, err := procWNetGetProviderNameA.Call(
	uintptr(dwNetType),
	uintptr(lpProviderName),
	uintptr(lpBufferSize),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // WIN32_ERROR

function WNetGetProviderNameA(
  dwNetType: DWORD;   // DWORD
  lpProviderName: PAnsiChar;   // LPSTR out
  lpBufferSize: Pointer   // DWORD* in/out
): DWORD; stdcall;
  external 'MPR.dll' name 'WNetGetProviderNameA';

result := DllCall("MPR\WNetGetProviderNameA"
    , "UInt", dwNetType   ; DWORD
    , "Ptr", lpProviderName   ; LPSTR out
    , "Ptr", lpBufferSize   ; DWORD* in/out
    , "UInt")   ; return: WIN32_ERROR

●WNetGetProviderNameA(dwNetType, lpProviderName, lpBufferSize) = DLL("MPR.dll", "dword WNetGetProviderNameA(dword, char*, void*)")
# 呼び出し: WNetGetProviderNameA(dwNetType, lpProviderName, lpBufferSize)
# dwNetType : DWORD -> "dword"
# lpProviderName : LPSTR out -> "char*"
# lpBufferSize : 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)。