WNetGetConnectionA

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

WIN32_ERROR WNetGetConnectionA(
    LPCSTR lpLocalName,
    LPSTR lpRemoteName,   // optional
    DWORD* lpnLength
);

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

' lpLocalName : LPCSTR
' lpRemoteName : LPSTR optional, out
' lpnLength : DWORD* in/out
Declare PtrSafe Function WNetGetConnectionA Lib "mpr" ( _
    ByVal lpLocalName As String, _
    ByVal lpRemoteName 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

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

require 'fiddle'
require 'fiddle/import'

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

#[link(name = "mpr")]
extern "system" {
    fn WNetGetConnectionA(
        lpLocalName: *const u8,  // LPCSTR
        lpRemoteName: *mut u8,  // LPSTR optional, 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 WNetGetConnectionA([MarshalAs(UnmanagedType.LPStr)] string lpLocalName, [MarshalAs(UnmanagedType.LPStr)] System.Text.StringBuilder lpRemoteName, ref uint lpnLength);
"@
$api = Add-Type -MemberDefinition $sig -Name 'MPR_WNetGetConnectionA' -Namespace Win32 -PassThru
# $api::WNetGetConnectionA(lpLocalName, lpRemoteName, lpnLength)

#uselib "MPR.dll"
#func global WNetGetConnectionA "WNetGetConnectionA" sptr, sptr, sptr
; WNetGetConnectionA lpLocalName, varptr(lpRemoteName), varptr(lpnLength)   ; 戻り値は stat
; lpLocalName : LPCSTR -> "sptr"
; lpRemoteName : LPSTR optional, 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 WNetGetConnectionA "WNetGetConnectionA" str, var, var
; res = WNetGetConnectionA(lpLocalName, lpRemoteName, lpnLength)
; lpLocalName : LPCSTR -> "str"
; lpRemoteName : LPSTR optional, 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 WNetGetConnectionA(LPCSTR lpLocalName, LPSTR lpRemoteName, DWORD* lpnLength)
#uselib "MPR.dll"
#cfunc global WNetGetConnectionA "WNetGetConnectionA" str, var, var
; res = WNetGetConnectionA(lpLocalName, lpRemoteName, lpnLength)
; lpLocalName : LPCSTR -> "str"
; lpRemoteName : LPSTR optional, 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")
	procWNetGetConnectionA = mpr.NewProc("WNetGetConnectionA")
)

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

function WNetGetConnectionA(
  lpLocalName: PAnsiChar;   // LPCSTR
  lpRemoteName: PAnsiChar;   // LPSTR optional, out
  lpnLength: Pointer   // DWORD* in/out
): DWORD; stdcall;
  external 'MPR.dll' name 'WNetGetConnectionA';

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

●WNetGetConnectionA(lpLocalName, lpRemoteName, lpnLength) = DLL("MPR.dll", "dword WNetGetConnectionA(char*, char*, void*)")
# 呼び出し: WNetGetConnectionA(lpLocalName, lpRemoteName, lpnLength)
# lpLocalName : LPCSTR -> "char*"
# lpRemoteName : LPSTR optional, 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)。