DoDragDrop

// OLE32.dll
#include <windows.h>

HRESULT DoDragDrop(
    IDataObject* pDataObj,
    IDropSource* pDropSource,
    DROPEFFECT dwOKEffects,
    DROPEFFECT* pdwEffect
);

<DllImport("OLE32.dll", ExactSpelling:=True)>
Public Shared Function DoDragDrop(
    pDataObj As IntPtr,   ' IDataObject*
    pDropSource As IntPtr,   ' IDropSource*
    dwOKEffects As UInteger,   ' DROPEFFECT
    <Out> ByRef pdwEffect As UInteger   ' DROPEFFECT* out
) As Integer
End Function

' pDataObj : IDataObject*
' pDropSource : IDropSource*
' dwOKEffects : DROPEFFECT
' pdwEffect : DROPEFFECT* out
Declare PtrSafe Function DoDragDrop Lib "ole32" ( _
    ByVal pDataObj As LongPtr, _
    ByVal pDropSource As LongPtr, _
    ByVal dwOKEffects As Long, _
    ByRef pdwEffect 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

DoDragDrop = ctypes.windll.ole32.DoDragDrop
DoDragDrop.restype = ctypes.c_int
DoDragDrop.argtypes = [
    ctypes.c_void_p,  # pDataObj : IDataObject*
    ctypes.c_void_p,  # pDropSource : IDropSource*
    wintypes.DWORD,  # dwOKEffects : DROPEFFECT
    ctypes.c_void_p,  # pdwEffect : DROPEFFECT* out
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('OLE32.dll')
DoDragDrop = Fiddle::Function.new(
  lib['DoDragDrop'],
  [
    Fiddle::TYPE_VOIDP,  # pDataObj : IDataObject*
    Fiddle::TYPE_VOIDP,  # pDropSource : IDropSource*
    -Fiddle::TYPE_INT,  # dwOKEffects : DROPEFFECT
    Fiddle::TYPE_VOIDP,  # pdwEffect : DROPEFFECT* out
  ],
  Fiddle::TYPE_INT)

#[link(name = "ole32")]
extern "system" {
    fn DoDragDrop(
        pDataObj: *mut core::ffi::c_void,  // IDataObject*
        pDropSource: *mut core::ffi::c_void,  // IDropSource*
        dwOKEffects: u32,  // DROPEFFECT
        pdwEffect: *mut u32  // DROPEFFECT* out
    ) -> i32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("OLE32.dll")]
public static extern int DoDragDrop(IntPtr pDataObj, IntPtr pDropSource, uint dwOKEffects, out uint pdwEffect);
"@
$api = Add-Type -MemberDefinition $sig -Name 'OLE32_DoDragDrop' -Namespace Win32 -PassThru
# $api::DoDragDrop(pDataObj, pDropSource, dwOKEffects, pdwEffect)

#uselib "OLE32.dll"
#func global DoDragDrop "DoDragDrop" sptr, sptr, sptr, sptr
; DoDragDrop pDataObj, pDropSource, dwOKEffects, pdwEffect   ; 戻り値は stat
; pDataObj : IDataObject* -> "sptr"
; pDropSource : IDropSource* -> "sptr"
; dwOKEffects : DROPEFFECT -> "sptr"
; pdwEffect : DROPEFFECT* 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 "OLE32.dll"
#cfunc global DoDragDrop "DoDragDrop" sptr, sptr, int, int
; res = DoDragDrop(pDataObj, pDropSource, dwOKEffects, pdwEffect)
; pDataObj : IDataObject* -> "sptr"
; pDropSource : IDropSource* -> "sptr"
; dwOKEffects : DROPEFFECT -> "int"
; pdwEffect : DROPEFFECT* out -> "int"

; HRESULT DoDragDrop(IDataObject* pDataObj, IDropSource* pDropSource, DROPEFFECT dwOKEffects, DROPEFFECT* pdwEffect)
#uselib "OLE32.dll"
#cfunc global DoDragDrop "DoDragDrop" intptr, intptr, int, int
; res = DoDragDrop(pDataObj, pDropSource, dwOKEffects, pdwEffect)
; pDataObj : IDataObject* -> "intptr"
; pDropSource : IDropSource* -> "intptr"
; dwOKEffects : DROPEFFECT -> "int"
; pdwEffect : DROPEFFECT* out -> "int"

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

var (
	ole32 = windows.NewLazySystemDLL("OLE32.dll")
	procDoDragDrop = ole32.NewProc("DoDragDrop")
)

// pDataObj (IDataObject*), pDropSource (IDropSource*), dwOKEffects (DROPEFFECT), pdwEffect (DROPEFFECT* out)
r1, _, err := procDoDragDrop.Call(
	uintptr(pDataObj),
	uintptr(pDropSource),
	uintptr(dwOKEffects),
	uintptr(pdwEffect),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // HRESULT

function DoDragDrop(
  pDataObj: Pointer;   // IDataObject*
  pDropSource: Pointer;   // IDropSource*
  dwOKEffects: DWORD;   // DROPEFFECT
  pdwEffect: Pointer   // DROPEFFECT* out
): Integer; stdcall;
  external 'OLE32.dll' name 'DoDragDrop';

result := DllCall("OLE32\DoDragDrop"
    , "Ptr", pDataObj   ; IDataObject*
    , "Ptr", pDropSource   ; IDropSource*
    , "UInt", dwOKEffects   ; DROPEFFECT
    , "Ptr", pdwEffect   ; DROPEFFECT* out
    , "Int")   ; return: HRESULT

●DoDragDrop(pDataObj, pDropSource, dwOKEffects, pdwEffect) = DLL("OLE32.dll", "int DoDragDrop(void*, void*, dword, void*)")
# 呼び出し: DoDragDrop(pDataObj, pDropSource, dwOKEffects, pdwEffect)
# pDataObj : IDataObject* -> "void*"
# pDropSource : IDropSource* -> "void*"
# dwOKEffects : DROPEFFECT -> "dword"
# pdwEffect : DROPEFFECT* 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)。