CredDeleteA

// ADVAPI32.dll  (ANSI / -A)
#include <windows.h>

BOOL CredDeleteA(
    LPCSTR TargetName,
    CRED_TYPE Type,
    DWORD Flags   // optional
);

<DllImport("ADVAPI32.dll", CharSet:=CharSet.Ansi, SetLastError:=True, ExactSpelling:=True)>
Public Shared Function CredDeleteA(
    <MarshalAs(UnmanagedType.LPStr)> TargetName As String,   ' LPCSTR
    Type As UInteger,   ' CRED_TYPE
    Flags As UInteger   ' DWORD optional
) As Boolean
End Function

' TargetName : LPCSTR
' Type : CRED_TYPE
' Flags : DWORD optional
Declare PtrSafe Function CredDeleteA Lib "advapi32" ( _
    ByVal TargetName As String, _
    ByVal Type As Long, _
    ByVal Flags 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

CredDeleteA = ctypes.windll.advapi32.CredDeleteA
CredDeleteA.restype = wintypes.BOOL
CredDeleteA.argtypes = [
    wintypes.LPCSTR,  # TargetName : LPCSTR
    wintypes.DWORD,  # Type : CRED_TYPE
    wintypes.DWORD,  # Flags : DWORD optional
]
# GetLastError: use ctypes.GetLastError() (or ctypes.WinDLL(use_last_error=True))

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('ADVAPI32.dll')
CredDeleteA = Fiddle::Function.new(
  lib['CredDeleteA'],
  [
    Fiddle::TYPE_VOIDP,  # TargetName : LPCSTR
    -Fiddle::TYPE_INT,  # Type : CRED_TYPE
    -Fiddle::TYPE_INT,  # Flags : DWORD optional
  ],
  Fiddle::TYPE_INT)

#[link(name = "advapi32")]
extern "system" {
    fn CredDeleteA(
        TargetName: *const u8,  // LPCSTR
        Type: u32,  // CRED_TYPE
        Flags: u32  // DWORD optional
    ) -> i32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[return: MarshalAs(UnmanagedType.Bool)]
[DllImport("ADVAPI32.dll", CharSet = CharSet.Ansi, SetLastError = true)]
public static extern bool CredDeleteA([MarshalAs(UnmanagedType.LPStr)] string TargetName, uint Type, uint Flags);
"@
$api = Add-Type -MemberDefinition $sig -Name 'ADVAPI32_CredDeleteA' -Namespace Win32 -PassThru
# $api::CredDeleteA(TargetName, Type, Flags)

#uselib "ADVAPI32.dll"
#func global CredDeleteA "CredDeleteA" sptr, sptr, sptr
; CredDeleteA TargetName, Type, Flags   ; 戻り値は stat
; TargetName : LPCSTR -> "sptr"
; Type : CRED_TYPE -> "sptr"
; Flags : DWORD optional -> "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 "ADVAPI32.dll"
#cfunc global CredDeleteA "CredDeleteA" str, int, int
; res = CredDeleteA(TargetName, Type, Flags)
; TargetName : LPCSTR -> "str"
; Type : CRED_TYPE -> "int"
; Flags : DWORD optional -> "int"

; BOOL CredDeleteA(LPCSTR TargetName, CRED_TYPE Type, DWORD Flags)
#uselib "ADVAPI32.dll"
#cfunc global CredDeleteA "CredDeleteA" str, int, int
; res = CredDeleteA(TargetName, Type, Flags)
; TargetName : LPCSTR -> "str"
; Type : CRED_TYPE -> "int"
; Flags : DWORD optional -> "int"

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

var (
	advapi32 = windows.NewLazySystemDLL("ADVAPI32.dll")
	procCredDeleteA = advapi32.NewProc("CredDeleteA")
)

// TargetName (LPCSTR), Type (CRED_TYPE), Flags (DWORD optional)
r1, _, err := procCredDeleteA.Call(
	uintptr(unsafe.Pointer(windows.BytePtrFromString(TargetName))),
	uintptr(Type),
	uintptr(Flags),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // BOOL

function CredDeleteA(
  TargetName: PAnsiChar;   // LPCSTR
  Type: DWORD;   // CRED_TYPE
  Flags: DWORD   // DWORD optional
): BOOL; stdcall;
  external 'ADVAPI32.dll' name 'CredDeleteA';

result := DllCall("ADVAPI32\CredDeleteA"
    , "AStr", TargetName   ; LPCSTR
    , "UInt", Type   ; CRED_TYPE
    , "UInt", Flags   ; DWORD optional
    , "Int")   ; return: BOOL

●CredDeleteA(TargetName, Type, Flags) = DLL("ADVAPI32.dll", "bool CredDeleteA(char*, dword, dword)")
# 呼び出し: CredDeleteA(TargetName, Type, Flags)
# TargetName : LPCSTR -> "char*"
# Type : CRED_TYPE -> "dword"
# Flags : DWORD optional -> "dword"
# 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)。