ConvertSystemTimeToCalDateTime

// KERNEL32.dll
#include <windows.h>

BOOL ConvertSystemTimeToCalDateTime(
    const SYSTEMTIME* lpSysTime,
    DWORD calId,
    CALDATETIME* lpCalDateTime
);

<DllImport("KERNEL32.dll", ExactSpelling:=True)>
Public Shared Function ConvertSystemTimeToCalDateTime(
    lpSysTime As IntPtr,   ' SYSTEMTIME*
    calId As UInteger,   ' DWORD
    lpCalDateTime As IntPtr   ' CALDATETIME* out
) As Boolean
End Function

' lpSysTime : SYSTEMTIME*
' calId : DWORD
' lpCalDateTime : CALDATETIME* out
Declare PtrSafe Function ConvertSystemTimeToCalDateTime Lib "kernel32" ( _
    ByVal lpSysTime As LongPtr, _
    ByVal calId As Long, _
    ByVal lpCalDateTime As LongPtr) As Long
' VBA7前提(PtrSafe)。32bit Office では LongPtr→Long。Integer=16bit / Long=32bit / LongLong=64bit。

import ctypes
from ctypes import wintypes

ConvertSystemTimeToCalDateTime = ctypes.windll.kernel32.ConvertSystemTimeToCalDateTime
ConvertSystemTimeToCalDateTime.restype = wintypes.BOOL
ConvertSystemTimeToCalDateTime.argtypes = [
    ctypes.c_void_p,  # lpSysTime : SYSTEMTIME*
    wintypes.DWORD,  # calId : DWORD
    ctypes.c_void_p,  # lpCalDateTime : CALDATETIME* out
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('KERNEL32.dll')
ConvertSystemTimeToCalDateTime = Fiddle::Function.new(
  lib['ConvertSystemTimeToCalDateTime'],
  [
    Fiddle::TYPE_VOIDP,  # lpSysTime : SYSTEMTIME*
    -Fiddle::TYPE_INT,  # calId : DWORD
    Fiddle::TYPE_VOIDP,  # lpCalDateTime : CALDATETIME* out
  ],
  Fiddle::TYPE_INT)

#[link(name = "kernel32")]
extern "system" {
    fn ConvertSystemTimeToCalDateTime(
        lpSysTime: *const SYSTEMTIME,  // SYSTEMTIME*
        calId: u32,  // DWORD
        lpCalDateTime: *mut CALDATETIME  // CALDATETIME* out
    ) -> i32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[return: MarshalAs(UnmanagedType.Bool)]
[DllImport("KERNEL32.dll")]
public static extern bool ConvertSystemTimeToCalDateTime(IntPtr lpSysTime, uint calId, IntPtr lpCalDateTime);
"@
$api = Add-Type -MemberDefinition $sig -Name 'KERNEL32_ConvertSystemTimeToCalDateTime' -Namespace Win32 -PassThru
# $api::ConvertSystemTimeToCalDateTime(lpSysTime, calId, lpCalDateTime)

#uselib "KERNEL32.dll"
#func global ConvertSystemTimeToCalDateTime "ConvertSystemTimeToCalDateTime" sptr, sptr, sptr
; ConvertSystemTimeToCalDateTime varptr(lpSysTime), calId, varptr(lpCalDateTime)   ; 戻り値は stat
; lpSysTime : SYSTEMTIME* -> "sptr"
; calId : DWORD -> "sptr"
; lpCalDateTime : CALDATETIME* 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 "KERNEL32.dll"
#cfunc global ConvertSystemTimeToCalDateTime "ConvertSystemTimeToCalDateTime" var, int, var
; res = ConvertSystemTimeToCalDateTime(lpSysTime, calId, lpCalDateTime)
; lpSysTime : SYSTEMTIME* -> "var"
; calId : DWORD -> "int"
; lpCalDateTime : CALDATETIME* 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。

; BOOL ConvertSystemTimeToCalDateTime(SYSTEMTIME* lpSysTime, DWORD calId, CALDATETIME* lpCalDateTime)
#uselib "KERNEL32.dll"
#cfunc global ConvertSystemTimeToCalDateTime "ConvertSystemTimeToCalDateTime" var, int, var
; res = ConvertSystemTimeToCalDateTime(lpSysTime, calId, lpCalDateTime)
; lpSysTime : SYSTEMTIME* -> "var"
; calId : DWORD -> "int"
; lpCalDateTime : CALDATETIME* 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 (
	kernel32 = windows.NewLazySystemDLL("KERNEL32.dll")
	procConvertSystemTimeToCalDateTime = kernel32.NewProc("ConvertSystemTimeToCalDateTime")
)

// lpSysTime (SYSTEMTIME*), calId (DWORD), lpCalDateTime (CALDATETIME* out)
r1, _, err := procConvertSystemTimeToCalDateTime.Call(
	uintptr(lpSysTime),
	uintptr(calId),
	uintptr(lpCalDateTime),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // BOOL

function ConvertSystemTimeToCalDateTime(
  lpSysTime: Pointer;   // SYSTEMTIME*
  calId: DWORD;   // DWORD
  lpCalDateTime: Pointer   // CALDATETIME* out
): BOOL; stdcall;
  external 'KERNEL32.dll' name 'ConvertSystemTimeToCalDateTime';

result := DllCall("KERNEL32\ConvertSystemTimeToCalDateTime"
    , "Ptr", lpSysTime   ; SYSTEMTIME*
    , "UInt", calId   ; DWORD
    , "Ptr", lpCalDateTime   ; CALDATETIME* out
    , "Int")   ; return: BOOL

●ConvertSystemTimeToCalDateTime(lpSysTime, calId, lpCalDateTime) = DLL("KERNEL32.dll", "bool ConvertSystemTimeToCalDateTime(void*, dword, void*)")
# 呼び出し: ConvertSystemTimeToCalDateTime(lpSysTime, calId, lpCalDateTime)
# lpSysTime : SYSTEMTIME* -> "void*"
# calId : DWORD -> "dword"
# lpCalDateTime : CALDATETIME* 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)。