ucnv_setDefaultName

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

void ucnv_setDefaultName(
    LPCSTR name
);

<DllImport("icuuc.dll", ExactSpelling:=True, CallingConvention:=CallingConvention.Cdecl)>
Public Shared Sub ucnv_setDefaultName(
    <MarshalAs(UnmanagedType.LPStr)> name As String   ' LPCSTR
)
End Sub

' name : LPCSTR
Declare PtrSafe Sub ucnv_setDefaultName Lib "icuuc" ( _
    ByVal name As String)
' VBA7前提(PtrSafe)。32bit Office では LongPtr→Long。Integer=16bit / Long=32bit / LongLong=64bit。

import ctypes
from ctypes import wintypes

ucnv_setDefaultName = ctypes.cdll.icuuc.ucnv_setDefaultName
ucnv_setDefaultName.restype = None
ucnv_setDefaultName.argtypes = [
    wintypes.LPCSTR,  # name : LPCSTR
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('icuuc.dll')
ucnv_setDefaultName = Fiddle::Function.new(
  lib['ucnv_setDefaultName'],
  [
    Fiddle::TYPE_VOIDP,  # name : LPCSTR
  ],
  Fiddle::TYPE_VOID, Fiddle::Function::CDECL)

#[link(name = "icuuc")]
extern "C" {
    fn ucnv_setDefaultName(
        name: *const u8  // LPCSTR
    );
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("icuuc.dll", CallingConvention = CallingConvention.Cdecl)]
public static extern void ucnv_setDefaultName([MarshalAs(UnmanagedType.LPStr)] string name);
"@
$api = Add-Type -MemberDefinition $sig -Name 'icuuc_ucnv_setDefaultName' -Namespace Win32 -PassThru
# $api::ucnv_setDefaultName(name)

#uselib "icuuc.dll"
#func global ucnv_setDefaultName "ucnv_setDefaultName" sptr
; ucnv_setDefaultName name
; name : LPCSTR -> "sptr"

#uselib "icuuc.dll"
#func global ucnv_setDefaultName "ucnv_setDefaultName" str
; ucnv_setDefaultName name
; name : LPCSTR -> "str"

; void ucnv_setDefaultName(LPCSTR name)
#uselib "icuuc.dll"
#func global ucnv_setDefaultName "ucnv_setDefaultName" str
; ucnv_setDefaultName name
; name : LPCSTR -> "str"

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

var (
	icuuc = windows.NewLazySystemDLL("icuuc.dll")
	procucnv_setDefaultName = icuuc.NewProc("ucnv_setDefaultName")
)

// name (LPCSTR)
r1, _, err := procucnv_setDefaultName.Call(
	uintptr(unsafe.Pointer(windows.BytePtrFromString(name))),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // void

procedure ucnv_setDefaultName(
  name: PAnsiChar   // LPCSTR
); cdecl;
  external 'icuuc.dll' name 'ucnv_setDefaultName';

result := DllCall("icuuc\ucnv_setDefaultName"
    , "AStr", name   ; LPCSTR
    , "Cdecl Int")   ; return: void

●ucnv_setDefaultName(name) = DLL("icuuc.dll", "int ucnv_setDefaultName(char*)")
# 呼び出し: ucnv_setDefaultName(name)
# name : 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)。
# ※cdecl関数。DLL()宣言はstdcall前提。cdeclは EXEC_PTR(`cdecl`,…) を使用。