ucnv_isFixedWidth

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

CHAR ucnv_isFixedWidth(
    UConverter* cnv,
    UErrorCode* status
);

<DllImport("icuuc.dll", ExactSpelling:=True, CallingConvention:=CallingConvention.Cdecl)>
Public Shared Function ucnv_isFixedWidth(
    ByRef cnv As IntPtr,   ' UConverter* in/out
    ByRef status As Integer   ' UErrorCode* in/out
) As SByte
End Function

' cnv : UConverter* in/out
' status : UErrorCode* in/out
Declare PtrSafe Function ucnv_isFixedWidth Lib "icuuc" ( _
    ByRef cnv As LongPtr, _
    ByRef status As Long) As Byte
' VBA7前提(PtrSafe)。32bit Office では LongPtr→Long。Integer=16bit / Long=32bit / LongLong=64bit。

import ctypes
from ctypes import wintypes

ucnv_isFixedWidth = ctypes.cdll.icuuc.ucnv_isFixedWidth
ucnv_isFixedWidth.restype = ctypes.c_byte
ucnv_isFixedWidth.argtypes = [
    ctypes.c_void_p,  # cnv : UConverter* in/out
    ctypes.c_void_p,  # status : UErrorCode* in/out
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('icuuc.dll')
ucnv_isFixedWidth = Fiddle::Function.new(
  lib['ucnv_isFixedWidth'],
  [
    Fiddle::TYPE_VOIDP,  # cnv : UConverter* in/out
    Fiddle::TYPE_VOIDP,  # status : UErrorCode* in/out
  ],
  Fiddle::TYPE_CHAR, Fiddle::Function::CDECL)

#[link(name = "icuuc")]
extern "C" {
    fn ucnv_isFixedWidth(
        cnv: *mut isize,  // UConverter* in/out
        status: *mut i32  // UErrorCode* in/out
    ) -> i8;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("icuuc.dll", CallingConvention = CallingConvention.Cdecl)]
public static extern sbyte ucnv_isFixedWidth(ref IntPtr cnv, ref int status);
"@
$api = Add-Type -MemberDefinition $sig -Name 'icuuc_ucnv_isFixedWidth' -Namespace Win32 -PassThru
# $api::ucnv_isFixedWidth(cnv, status)

#uselib "icuuc.dll"
#func global ucnv_isFixedWidth "ucnv_isFixedWidth" sptr, sptr
; ucnv_isFixedWidth cnv, status   ; 戻り値は stat
; cnv : UConverter* in/out -> "sptr"
; status : UErrorCode* 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 "icuuc.dll"
#cfunc global ucnv_isFixedWidth "ucnv_isFixedWidth" int, int
; res = ucnv_isFixedWidth(cnv, status)
; cnv : UConverter* in/out -> "int"
; status : UErrorCode* in/out -> "int"

; CHAR ucnv_isFixedWidth(UConverter* cnv, UErrorCode* status)
#uselib "icuuc.dll"
#cfunc global ucnv_isFixedWidth "ucnv_isFixedWidth" int, int
; res = ucnv_isFixedWidth(cnv, status)
; cnv : UConverter* in/out -> "int"
; status : UErrorCode* in/out -> "int"

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

var (
	icuuc = windows.NewLazySystemDLL("icuuc.dll")
	procucnv_isFixedWidth = icuuc.NewProc("ucnv_isFixedWidth")
)

// cnv (UConverter* in/out), status (UErrorCode* in/out)
r1, _, err := procucnv_isFixedWidth.Call(
	uintptr(cnv),
	uintptr(status),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // CHAR

function ucnv_isFixedWidth(
  cnv: Pointer;   // UConverter* in/out
  status: Pointer   // UErrorCode* in/out
): Shortint; cdecl;
  external 'icuuc.dll' name 'ucnv_isFixedWidth';

result := DllCall("icuuc\ucnv_isFixedWidth"
    , "Ptr", cnv   ; UConverter* in/out
    , "Ptr", status   ; UErrorCode* in/out
    , "Cdecl Char")   ; return: CHAR

●ucnv_isFixedWidth(cnv, status) = DLL("icuuc.dll", "char ucnv_isFixedWidth(void*, void*)")
# 呼び出し: ucnv_isFixedWidth(cnv, status)
# cnv : UConverter* in/out -> "void*"
# status : UErrorCode* 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)。
# ※cdecl関数。DLL()宣言はstdcall前提。cdeclは EXEC_PTR(`cdecl`,…) を使用。