OpenMutexA

// KERNEL32.dll  (ANSI / -A)
#include <windows.h>

HANDLE OpenMutexA(
    DWORD dwDesiredAccess,
    BOOL bInheritHandle,
    LPCSTR lpName
);

<DllImport("KERNEL32.dll", CharSet:=CharSet.Ansi, ExactSpelling:=True)>
Public Shared Function OpenMutexA(
    dwDesiredAccess As UInteger,   ' DWORD
    bInheritHandle As Boolean,   ' BOOL
    <MarshalAs(UnmanagedType.LPStr)> lpName As String   ' LPCSTR
) As IntPtr
End Function

' dwDesiredAccess : DWORD
' bInheritHandle : BOOL
' lpName : LPCSTR
Declare PtrSafe Function OpenMutexA Lib "kernel32" ( _
    ByVal dwDesiredAccess As Long, _
    ByVal bInheritHandle As Long, _
    ByVal lpName As String) As LongPtr
' VBA7前提(PtrSafe)。32bit Office では LongPtr→Long。Integer=16bit / Long=32bit / LongLong=64bit。

import ctypes
from ctypes import wintypes

OpenMutexA = ctypes.windll.kernel32.OpenMutexA
OpenMutexA.restype = ctypes.c_void_p
OpenMutexA.argtypes = [
    wintypes.DWORD,  # dwDesiredAccess : DWORD
    wintypes.BOOL,  # bInheritHandle : BOOL
    wintypes.LPCSTR,  # lpName : LPCSTR
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('KERNEL32.dll')
OpenMutexA = Fiddle::Function.new(
  lib['OpenMutexA'],
  [
    -Fiddle::TYPE_INT,  # dwDesiredAccess : DWORD
    Fiddle::TYPE_INT,  # bInheritHandle : BOOL
    Fiddle::TYPE_VOIDP,  # lpName : LPCSTR
  ],
  Fiddle::TYPE_VOIDP)

#[link(name = "kernel32")]
extern "system" {
    fn OpenMutexA(
        dwDesiredAccess: u32,  // DWORD
        bInheritHandle: i32,  // BOOL
        lpName: *const u8  // LPCSTR
    ) -> *mut core::ffi::c_void;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("KERNEL32.dll", CharSet = CharSet.Ansi)]
public static extern IntPtr OpenMutexA(uint dwDesiredAccess, bool bInheritHandle, [MarshalAs(UnmanagedType.LPStr)] string lpName);
"@
$api = Add-Type -MemberDefinition $sig -Name 'KERNEL32_OpenMutexA' -Namespace Win32 -PassThru
# $api::OpenMutexA(dwDesiredAccess, bInheritHandle, lpName)

#uselib "KERNEL32.dll"
#func global OpenMutexA "OpenMutexA" sptr, sptr, sptr
; OpenMutexA dwDesiredAccess, bInheritHandle, lpName   ; 戻り値は stat
; dwDesiredAccess : DWORD -> "sptr"
; bInheritHandle : BOOL -> "sptr"
; lpName : LPCSTR -> "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 "KERNEL32.dll"
#cfunc global OpenMutexA "OpenMutexA" int, int, str
; res = OpenMutexA(dwDesiredAccess, bInheritHandle, lpName)
; dwDesiredAccess : DWORD -> "int"
; bInheritHandle : BOOL -> "int"
; lpName : LPCSTR -> "str"

; HANDLE OpenMutexA(DWORD dwDesiredAccess, BOOL bInheritHandle, LPCSTR lpName)
#uselib "KERNEL32.dll"
#cfunc global OpenMutexA "OpenMutexA" int, int, str
; res = OpenMutexA(dwDesiredAccess, bInheritHandle, lpName)
; dwDesiredAccess : DWORD -> "int"
; bInheritHandle : BOOL -> "int"
; lpName : LPCSTR -> "str"

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

var (
	kernel32 = windows.NewLazySystemDLL("KERNEL32.dll")
	procOpenMutexA = kernel32.NewProc("OpenMutexA")
)

// dwDesiredAccess (DWORD), bInheritHandle (BOOL), lpName (LPCSTR)
r1, _, err := procOpenMutexA.Call(
	uintptr(dwDesiredAccess),
	uintptr(bInheritHandle),
	uintptr(unsafe.Pointer(windows.BytePtrFromString(lpName))),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // HANDLE

function OpenMutexA(
  dwDesiredAccess: DWORD;   // DWORD
  bInheritHandle: BOOL;   // BOOL
  lpName: PAnsiChar   // LPCSTR
): THandle; stdcall;
  external 'KERNEL32.dll' name 'OpenMutexA';

result := DllCall("KERNEL32\OpenMutexA"
    , "UInt", dwDesiredAccess   ; DWORD
    , "Int", bInheritHandle   ; BOOL
    , "AStr", lpName   ; LPCSTR
    , "Ptr")   ; return: HANDLE

●OpenMutexA(dwDesiredAccess, bInheritHandle, lpName) = DLL("KERNEL32.dll", "void* OpenMutexA(dword, bool, char*)")
# 呼び出し: OpenMutexA(dwDesiredAccess, bInheritHandle, lpName)
# dwDesiredAccess : DWORD -> "dword"
# bInheritHandle : BOOL -> "bool"
# lpName : LPCSTR -> "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)。