ucnv_convert

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

INT ucnv_convert(
    LPCSTR toConverterName,
    LPCSTR fromConverterName,
    LPSTR target,
    INT targetCapacity,
    LPCSTR source,
    INT sourceLength,
    UErrorCode* pErrorCode
);

<DllImport("icuuc.dll", ExactSpelling:=True, CallingConvention:=CallingConvention.Cdecl)>
Public Shared Function ucnv_convert(
    <MarshalAs(UnmanagedType.LPStr)> toConverterName As String,   ' LPCSTR
    <MarshalAs(UnmanagedType.LPStr)> fromConverterName As String,   ' LPCSTR
    <MarshalAs(UnmanagedType.LPStr)> target As String,   ' LPSTR
    targetCapacity As Integer,   ' INT
    <MarshalAs(UnmanagedType.LPStr)> source As String,   ' LPCSTR
    sourceLength As Integer,   ' INT
    ByRef pErrorCode As Integer   ' UErrorCode* in/out
) As Integer
End Function

' toConverterName : LPCSTR
' fromConverterName : LPCSTR
' target : LPSTR
' targetCapacity : INT
' source : LPCSTR
' sourceLength : INT
' pErrorCode : UErrorCode* in/out
Declare PtrSafe Function ucnv_convert Lib "icuuc" ( _
    ByVal toConverterName As String, _
    ByVal fromConverterName As String, _
    ByVal target As String, _
    ByVal targetCapacity As Long, _
    ByVal source As String, _
    ByVal sourceLength As Long, _
    ByRef pErrorCode 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

ucnv_convert = ctypes.cdll.icuuc.ucnv_convert
ucnv_convert.restype = ctypes.c_int
ucnv_convert.argtypes = [
    wintypes.LPCSTR,  # toConverterName : LPCSTR
    wintypes.LPCSTR,  # fromConverterName : LPCSTR
    wintypes.LPCSTR,  # target : LPSTR
    ctypes.c_int,  # targetCapacity : INT
    wintypes.LPCSTR,  # source : LPCSTR
    ctypes.c_int,  # sourceLength : INT
    ctypes.c_void_p,  # pErrorCode : UErrorCode* in/out
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('icuuc.dll')
ucnv_convert = Fiddle::Function.new(
  lib['ucnv_convert'],
  [
    Fiddle::TYPE_VOIDP,  # toConverterName : LPCSTR
    Fiddle::TYPE_VOIDP,  # fromConverterName : LPCSTR
    Fiddle::TYPE_VOIDP,  # target : LPSTR
    Fiddle::TYPE_INT,  # targetCapacity : INT
    Fiddle::TYPE_VOIDP,  # source : LPCSTR
    Fiddle::TYPE_INT,  # sourceLength : INT
    Fiddle::TYPE_VOIDP,  # pErrorCode : UErrorCode* in/out
  ],
  Fiddle::TYPE_INT, Fiddle::Function::CDECL)

#[link(name = "icuuc")]
extern "C" {
    fn ucnv_convert(
        toConverterName: *const u8,  // LPCSTR
        fromConverterName: *const u8,  // LPCSTR
        target: *mut u8,  // LPSTR
        targetCapacity: i32,  // INT
        source: *const u8,  // LPCSTR
        sourceLength: i32,  // INT
        pErrorCode: *mut i32  // UErrorCode* in/out
    ) -> i32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("icuuc.dll", CallingConvention = CallingConvention.Cdecl)]
public static extern int ucnv_convert([MarshalAs(UnmanagedType.LPStr)] string toConverterName, [MarshalAs(UnmanagedType.LPStr)] string fromConverterName, [MarshalAs(UnmanagedType.LPStr)] string target, int targetCapacity, [MarshalAs(UnmanagedType.LPStr)] string source, int sourceLength, ref int pErrorCode);
"@
$api = Add-Type -MemberDefinition $sig -Name 'icuuc_ucnv_convert' -Namespace Win32 -PassThru
# $api::ucnv_convert(toConverterName, fromConverterName, target, targetCapacity, source, sourceLength, pErrorCode)

#uselib "icuuc.dll"
#func global ucnv_convert "ucnv_convert" sptr, sptr, sptr, sptr, sptr, sptr, sptr
; ucnv_convert toConverterName, fromConverterName, target, targetCapacity, source, sourceLength, pErrorCode   ; 戻り値は stat
; toConverterName : LPCSTR -> "sptr"
; fromConverterName : LPCSTR -> "sptr"
; target : LPSTR -> "sptr"
; targetCapacity : INT -> "sptr"
; source : LPCSTR -> "sptr"
; sourceLength : INT -> "sptr"
; pErrorCode : 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_convert "ucnv_convert" str, str, str, int, str, int, int
; res = ucnv_convert(toConverterName, fromConverterName, target, targetCapacity, source, sourceLength, pErrorCode)
; toConverterName : LPCSTR -> "str"
; fromConverterName : LPCSTR -> "str"
; target : LPSTR -> "str"
; targetCapacity : INT -> "int"
; source : LPCSTR -> "str"
; sourceLength : INT -> "int"
; pErrorCode : UErrorCode* in/out -> "int"

; INT ucnv_convert(LPCSTR toConverterName, LPCSTR fromConverterName, LPSTR target, INT targetCapacity, LPCSTR source, INT sourceLength, UErrorCode* pErrorCode)
#uselib "icuuc.dll"
#cfunc global ucnv_convert "ucnv_convert" str, str, str, int, str, int, int
; res = ucnv_convert(toConverterName, fromConverterName, target, targetCapacity, source, sourceLength, pErrorCode)
; toConverterName : LPCSTR -> "str"
; fromConverterName : LPCSTR -> "str"
; target : LPSTR -> "str"
; targetCapacity : INT -> "int"
; source : LPCSTR -> "str"
; sourceLength : INT -> "int"
; pErrorCode : UErrorCode* in/out -> "int"

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

var (
	icuuc = windows.NewLazySystemDLL("icuuc.dll")
	procucnv_convert = icuuc.NewProc("ucnv_convert")
)

// toConverterName (LPCSTR), fromConverterName (LPCSTR), target (LPSTR), targetCapacity (INT), source (LPCSTR), sourceLength (INT), pErrorCode (UErrorCode* in/out)
r1, _, err := procucnv_convert.Call(
	uintptr(unsafe.Pointer(windows.BytePtrFromString(toConverterName))),
	uintptr(unsafe.Pointer(windows.BytePtrFromString(fromConverterName))),
	uintptr(unsafe.Pointer(windows.BytePtrFromString(target))),
	uintptr(targetCapacity),
	uintptr(unsafe.Pointer(windows.BytePtrFromString(source))),
	uintptr(sourceLength),
	uintptr(pErrorCode),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // INT

function ucnv_convert(
  toConverterName: PAnsiChar;   // LPCSTR
  fromConverterName: PAnsiChar;   // LPCSTR
  target: PAnsiChar;   // LPSTR
  targetCapacity: Integer;   // INT
  source: PAnsiChar;   // LPCSTR
  sourceLength: Integer;   // INT
  pErrorCode: Pointer   // UErrorCode* in/out
): Integer; cdecl;
  external 'icuuc.dll' name 'ucnv_convert';

result := DllCall("icuuc\ucnv_convert"
    , "AStr", toConverterName   ; LPCSTR
    , "AStr", fromConverterName   ; LPCSTR
    , "AStr", target   ; LPSTR
    , "Int", targetCapacity   ; INT
    , "AStr", source   ; LPCSTR
    , "Int", sourceLength   ; INT
    , "Ptr", pErrorCode   ; UErrorCode* in/out
    , "Cdecl Int")   ; return: INT

●ucnv_convert(toConverterName, fromConverterName, target, targetCapacity, source, sourceLength, pErrorCode) = DLL("icuuc.dll", "int ucnv_convert(char*, char*, char*, int, char*, int, void*)")
# 呼び出し: ucnv_convert(toConverterName, fromConverterName, target, targetCapacity, source, sourceLength, pErrorCode)
# toConverterName : LPCSTR -> "char*"
# fromConverterName : LPCSTR -> "char*"
# target : LPSTR -> "char*"
# targetCapacity : INT -> "int"
# source : LPCSTR -> "char*"
# sourceLength : INT -> "int"
# pErrorCode : 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。