ucnv_getName

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

LPSTR ucnv_getName(
    const UConverter* converter,
    UErrorCode* err
);

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

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

import ctypes
from ctypes import wintypes

ucnv_getName = ctypes.cdll.icuuc.ucnv_getName
ucnv_getName.restype = wintypes.LPSTR
ucnv_getName.argtypes = [
    ctypes.c_void_p,  # converter : UConverter*
    ctypes.c_void_p,  # err : UErrorCode* in/out
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('icuuc.dll')
ucnv_getName = Fiddle::Function.new(
  lib['ucnv_getName'],
  [
    Fiddle::TYPE_VOIDP,  # converter : UConverter*
    Fiddle::TYPE_VOIDP,  # err : UErrorCode* in/out
  ],
  Fiddle::TYPE_VOIDP, Fiddle::Function::CDECL)

#[link(name = "icuuc")]
extern "C" {
    fn ucnv_getName(
        converter: *const isize,  // UConverter*
        err: *mut i32  // UErrorCode* in/out
    ) -> *mut u8;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("icuuc.dll", CallingConvention = CallingConvention.Cdecl)]
public static extern IntPtr ucnv_getName(ref IntPtr converter, ref int err);
"@
$api = Add-Type -MemberDefinition $sig -Name 'icuuc_ucnv_getName' -Namespace Win32 -PassThru
# $api::ucnv_getName(converter, err)

#uselib "icuuc.dll"
#func global ucnv_getName "ucnv_getName" sptr, sptr
; ucnv_getName converter, err   ; 戻り値は stat
; converter : UConverter* -> "sptr"
; err : 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_getName "ucnv_getName" int, int
; res = ucnv_getName(converter, err)
; converter : UConverter* -> "int"
; err : UErrorCode* in/out -> "int"

; LPSTR ucnv_getName(UConverter* converter, UErrorCode* err)
#uselib "icuuc.dll"
#cfunc global ucnv_getName "ucnv_getName" int, int
; res = ucnv_getName(converter, err)
; converter : UConverter* -> "int"
; err : UErrorCode* in/out -> "int"

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

var (
	icuuc = windows.NewLazySystemDLL("icuuc.dll")
	procucnv_getName = icuuc.NewProc("ucnv_getName")
)

// converter (UConverter*), err (UErrorCode* in/out)
r1, _, err := procucnv_getName.Call(
	uintptr(converter),
	uintptr(err),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // LPSTR

function ucnv_getName(
  converter: Pointer;   // UConverter*
  err: Pointer   // UErrorCode* in/out
): PAnsiChar; cdecl;
  external 'icuuc.dll' name 'ucnv_getName';

result := DllCall("icuuc\ucnv_getName"
    , "Ptr", converter   ; UConverter*
    , "Ptr", err   ; UErrorCode* in/out
    , "Cdecl Ptr")   ; return: LPSTR

●ucnv_getName(converter, err) = DLL("icuuc.dll", "char* ucnv_getName(void*, void*)")
# 呼び出し: ucnv_getName(converter, err)
# converter : UConverter* -> "void*"
# err : 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。