DdeQueryConvInfo

// USER32.dll
#include <windows.h>

DWORD DdeQueryConvInfo(
    HCONV hConv,
    DWORD idTransaction,
    CONVINFO* pConvInfo
);

<DllImport("USER32.dll", ExactSpelling:=True)>
Public Shared Function DdeQueryConvInfo(
    hConv As IntPtr,   ' HCONV
    idTransaction As UInteger,   ' DWORD
    pConvInfo As IntPtr   ' CONVINFO* in/out
) As UInteger
End Function

' hConv : HCONV
' idTransaction : DWORD
' pConvInfo : CONVINFO* in/out
Declare PtrSafe Function DdeQueryConvInfo Lib "user32" ( _
    ByVal hConv As LongPtr, _
    ByVal idTransaction As Long, _
    ByVal pConvInfo As LongPtr) As Long
' VBA7前提(PtrSafe)。32bit Office では LongPtr→Long。Integer=16bit / Long=32bit / LongLong=64bit。

import ctypes
from ctypes import wintypes

DdeQueryConvInfo = ctypes.windll.user32.DdeQueryConvInfo
DdeQueryConvInfo.restype = wintypes.DWORD
DdeQueryConvInfo.argtypes = [
    wintypes.HANDLE,  # hConv : HCONV
    wintypes.DWORD,  # idTransaction : DWORD
    ctypes.c_void_p,  # pConvInfo : CONVINFO* in/out
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('USER32.dll')
DdeQueryConvInfo = Fiddle::Function.new(
  lib['DdeQueryConvInfo'],
  [
    Fiddle::TYPE_VOIDP,  # hConv : HCONV
    -Fiddle::TYPE_INT,  # idTransaction : DWORD
    Fiddle::TYPE_VOIDP,  # pConvInfo : CONVINFO* in/out
  ],
  -Fiddle::TYPE_INT)

#[link(name = "user32")]
extern "system" {
    fn DdeQueryConvInfo(
        hConv: *mut core::ffi::c_void,  // HCONV
        idTransaction: u32,  // DWORD
        pConvInfo: *mut CONVINFO  // CONVINFO* in/out
    ) -> u32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("USER32.dll")]
public static extern uint DdeQueryConvInfo(IntPtr hConv, uint idTransaction, IntPtr pConvInfo);
"@
$api = Add-Type -MemberDefinition $sig -Name 'USER32_DdeQueryConvInfo' -Namespace Win32 -PassThru
# $api::DdeQueryConvInfo(hConv, idTransaction, pConvInfo)

#uselib "USER32.dll"
#func global DdeQueryConvInfo "DdeQueryConvInfo" sptr, sptr, sptr
; DdeQueryConvInfo hConv, idTransaction, varptr(pConvInfo)   ; 戻り値は stat
; hConv : HCONV -> "sptr"
; idTransaction : DWORD -> "sptr"
; pConvInfo : CONVINFO* 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 "USER32.dll"
#cfunc global DdeQueryConvInfo "DdeQueryConvInfo" sptr, int, var
; res = DdeQueryConvInfo(hConv, idTransaction, pConvInfo)
; hConv : HCONV -> "sptr"
; idTransaction : DWORD -> "int"
; pConvInfo : CONVINFO* in/out -> "var"
; ※出力/バッファ引数は var 方式(変数を直接渡す)。varptr 方式にも切替可。

; DWORD DdeQueryConvInfo(HCONV hConv, DWORD idTransaction, CONVINFO* pConvInfo)
#uselib "USER32.dll"
#cfunc global DdeQueryConvInfo "DdeQueryConvInfo" intptr, int, var
; res = DdeQueryConvInfo(hConv, idTransaction, pConvInfo)
; hConv : HCONV -> "intptr"
; idTransaction : DWORD -> "int"
; pConvInfo : CONVINFO* in/out -> "var"
; ※出力/バッファ引数は var 方式(変数を直接渡す)。varptr 方式にも切替可。

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

var (
	user32 = windows.NewLazySystemDLL("USER32.dll")
	procDdeQueryConvInfo = user32.NewProc("DdeQueryConvInfo")
)

// hConv (HCONV), idTransaction (DWORD), pConvInfo (CONVINFO* in/out)
r1, _, err := procDdeQueryConvInfo.Call(
	uintptr(hConv),
	uintptr(idTransaction),
	uintptr(pConvInfo),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // DWORD

function DdeQueryConvInfo(
  hConv: THandle;   // HCONV
  idTransaction: DWORD;   // DWORD
  pConvInfo: Pointer   // CONVINFO* in/out
): DWORD; stdcall;
  external 'USER32.dll' name 'DdeQueryConvInfo';

result := DllCall("USER32\DdeQueryConvInfo"
    , "Ptr", hConv   ; HCONV
    , "UInt", idTransaction   ; DWORD
    , "Ptr", pConvInfo   ; CONVINFO* in/out
    , "UInt")   ; return: DWORD

●DdeQueryConvInfo(hConv, idTransaction, pConvInfo) = DLL("USER32.dll", "dword DdeQueryConvInfo(void*, dword, void*)")
# 呼び出し: DdeQueryConvInfo(hConv, idTransaction, pConvInfo)
# hConv : HCONV -> "void*"
# idTransaction : DWORD -> "dword"
# pConvInfo : CONVINFO* 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)。