ImmGetCompositionStringA

// IMM32.dll  (ANSI / -A)
#include <windows.h>

INT ImmGetCompositionStringA(
    HIMC param0,
    IME_COMPOSITION_STRING param1,
    void* lpBuf,   // optional
    DWORD dwBufLen
);

<DllImport("IMM32.dll", CharSet:=CharSet.Ansi, ExactSpelling:=True)>
Public Shared Function ImmGetCompositionStringA(
    param0 As IntPtr,   ' HIMC
    param1 As UInteger,   ' IME_COMPOSITION_STRING
    lpBuf As IntPtr,   ' void* optional, out
    dwBufLen As UInteger   ' DWORD
) As Integer
End Function

' param0 : HIMC
' param1 : IME_COMPOSITION_STRING
' lpBuf : void* optional, out
' dwBufLen : DWORD
Declare PtrSafe Function ImmGetCompositionStringA Lib "imm32" ( _
    ByVal param0 As LongPtr, _
    ByVal param1 As Long, _
    ByVal lpBuf As LongPtr, _
    ByVal dwBufLen 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

ImmGetCompositionStringA = ctypes.windll.imm32.ImmGetCompositionStringA
ImmGetCompositionStringA.restype = ctypes.c_int
ImmGetCompositionStringA.argtypes = [
    wintypes.HANDLE,  # param0 : HIMC
    wintypes.DWORD,  # param1 : IME_COMPOSITION_STRING
    ctypes.POINTER(None),  # lpBuf : void* optional, out
    wintypes.DWORD,  # dwBufLen : DWORD
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('IMM32.dll')
ImmGetCompositionStringA = Fiddle::Function.new(
  lib['ImmGetCompositionStringA'],
  [
    Fiddle::TYPE_VOIDP,  # param0 : HIMC
    -Fiddle::TYPE_INT,  # param1 : IME_COMPOSITION_STRING
    Fiddle::TYPE_VOIDP,  # lpBuf : void* optional, out
    -Fiddle::TYPE_INT,  # dwBufLen : DWORD
  ],
  Fiddle::TYPE_INT)

#[link(name = "imm32")]
extern "system" {
    fn ImmGetCompositionStringA(
        param0: *mut core::ffi::c_void,  // HIMC
        param1: u32,  // IME_COMPOSITION_STRING
        lpBuf: *mut (),  // void* optional, out
        dwBufLen: u32  // DWORD
    ) -> i32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("IMM32.dll", CharSet = CharSet.Ansi)]
public static extern int ImmGetCompositionStringA(IntPtr param0, uint param1, IntPtr lpBuf, uint dwBufLen);
"@
$api = Add-Type -MemberDefinition $sig -Name 'IMM32_ImmGetCompositionStringA' -Namespace Win32 -PassThru
# $api::ImmGetCompositionStringA(param0, param1, lpBuf, dwBufLen)

#uselib "IMM32.dll"
#func global ImmGetCompositionStringA "ImmGetCompositionStringA" sptr, sptr, sptr, sptr
; ImmGetCompositionStringA param0, param1, lpBuf, dwBufLen   ; 戻り値は stat
; param0 : HIMC -> "sptr"
; param1 : IME_COMPOSITION_STRING -> "sptr"
; lpBuf : void* optional, out -> "sptr"
; dwBufLen : DWORD -> "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 "IMM32.dll"
#cfunc global ImmGetCompositionStringA "ImmGetCompositionStringA" sptr, int, sptr, int
; res = ImmGetCompositionStringA(param0, param1, lpBuf, dwBufLen)
; param0 : HIMC -> "sptr"
; param1 : IME_COMPOSITION_STRING -> "int"
; lpBuf : void* optional, out -> "sptr"
; dwBufLen : DWORD -> "int"

; INT ImmGetCompositionStringA(HIMC param0, IME_COMPOSITION_STRING param1, void* lpBuf, DWORD dwBufLen)
#uselib "IMM32.dll"
#cfunc global ImmGetCompositionStringA "ImmGetCompositionStringA" intptr, int, intptr, int
; res = ImmGetCompositionStringA(param0, param1, lpBuf, dwBufLen)
; param0 : HIMC -> "intptr"
; param1 : IME_COMPOSITION_STRING -> "int"
; lpBuf : void* optional, out -> "intptr"
; dwBufLen : DWORD -> "int"

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

var (
	imm32 = windows.NewLazySystemDLL("IMM32.dll")
	procImmGetCompositionStringA = imm32.NewProc("ImmGetCompositionStringA")
)

// param0 (HIMC), param1 (IME_COMPOSITION_STRING), lpBuf (void* optional, out), dwBufLen (DWORD)
r1, _, err := procImmGetCompositionStringA.Call(
	uintptr(param0),
	uintptr(param1),
	uintptr(lpBuf),
	uintptr(dwBufLen),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // INT

function ImmGetCompositionStringA(
  param0: THandle;   // HIMC
  param1: DWORD;   // IME_COMPOSITION_STRING
  lpBuf: Pointer;   // void* optional, out
  dwBufLen: DWORD   // DWORD
): Integer; stdcall;
  external 'IMM32.dll' name 'ImmGetCompositionStringA';

result := DllCall("IMM32\ImmGetCompositionStringA"
    , "Ptr", param0   ; HIMC
    , "UInt", param1   ; IME_COMPOSITION_STRING
    , "Ptr", lpBuf   ; void* optional, out
    , "UInt", dwBufLen   ; DWORD
    , "Int")   ; return: INT

●ImmGetCompositionStringA(param0, param1, lpBuf, dwBufLen) = DLL("IMM32.dll", "int ImmGetCompositionStringA(void*, dword, void*, dword)")
# 呼び出し: ImmGetCompositionStringA(param0, param1, lpBuf, dwBufLen)
# param0 : HIMC -> "void*"
# param1 : IME_COMPOSITION_STRING -> "dword"
# lpBuf : void* optional, out -> "void*"
# dwBufLen : DWORD -> "dword"
# 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)。