SHAssocEnumHandlersForProtocolByApplication

// SHELL32.dll
#include <windows.h>

HRESULT SHAssocEnumHandlersForProtocolByApplication(
    LPCWSTR protocol,
    const GUID* riid,
    void** enumHandlers
);

<DllImport("SHELL32.dll", ExactSpelling:=True)>
Public Shared Function SHAssocEnumHandlersForProtocolByApplication(
    <MarshalAs(UnmanagedType.LPWStr)> protocol As String,   ' LPCWSTR
    ByRef riid As Guid,   ' GUID*
    enumHandlers As IntPtr   ' void** out
) As Integer
End Function

' protocol : LPCWSTR
' riid : GUID*
' enumHandlers : void** out
Declare PtrSafe Function SHAssocEnumHandlersForProtocolByApplication Lib "shell32" ( _
    ByVal protocol As LongPtr, _
    ByVal riid As LongPtr, _
    ByVal enumHandlers 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

SHAssocEnumHandlersForProtocolByApplication = ctypes.windll.shell32.SHAssocEnumHandlersForProtocolByApplication
SHAssocEnumHandlersForProtocolByApplication.restype = ctypes.c_int
SHAssocEnumHandlersForProtocolByApplication.argtypes = [
    wintypes.LPCWSTR,  # protocol : LPCWSTR
    ctypes.c_void_p,  # riid : GUID*
    ctypes.c_void_p,  # enumHandlers : void** out
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('SHELL32.dll')
SHAssocEnumHandlersForProtocolByApplication = Fiddle::Function.new(
  lib['SHAssocEnumHandlersForProtocolByApplication'],
  [
    Fiddle::TYPE_VOIDP,  # protocol : LPCWSTR
    Fiddle::TYPE_VOIDP,  # riid : GUID*
    Fiddle::TYPE_VOIDP,  # enumHandlers : void** out
  ],
  Fiddle::TYPE_INT)

#[link(name = "shell32")]
extern "system" {
    fn SHAssocEnumHandlersForProtocolByApplication(
        protocol: *const u16,  // LPCWSTR
        riid: *const GUID,  // GUID*
        enumHandlers: *mut *mut ()  // void** out
    ) -> i32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("SHELL32.dll")]
public static extern int SHAssocEnumHandlersForProtocolByApplication([MarshalAs(UnmanagedType.LPWStr)] string protocol, ref Guid riid, IntPtr enumHandlers);
"@
$api = Add-Type -MemberDefinition $sig -Name 'SHELL32_SHAssocEnumHandlersForProtocolByApplication' -Namespace Win32 -PassThru
# $api::SHAssocEnumHandlersForProtocolByApplication(protocol, riid, enumHandlers)

#uselib "SHELL32.dll"
#func global SHAssocEnumHandlersForProtocolByApplication "SHAssocEnumHandlersForProtocolByApplication" sptr, sptr, sptr
; SHAssocEnumHandlersForProtocolByApplication protocol, varptr(riid), enumHandlers   ; 戻り値は stat
; protocol : LPCWSTR -> "sptr"
; riid : GUID* -> "sptr"
; enumHandlers : void** 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 "SHELL32.dll"
#cfunc global SHAssocEnumHandlersForProtocolByApplication "SHAssocEnumHandlersForProtocolByApplication" wstr, var, sptr
; res = SHAssocEnumHandlersForProtocolByApplication(protocol, riid, enumHandlers)
; protocol : LPCWSTR -> "wstr"
; riid : GUID* -> "var"
; enumHandlers : void** out -> "sptr"
; ※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。

; HRESULT SHAssocEnumHandlersForProtocolByApplication(LPCWSTR protocol, GUID* riid, void** enumHandlers)
#uselib "SHELL32.dll"
#cfunc global SHAssocEnumHandlersForProtocolByApplication "SHAssocEnumHandlersForProtocolByApplication" wstr, var, intptr
; res = SHAssocEnumHandlersForProtocolByApplication(protocol, riid, enumHandlers)
; protocol : LPCWSTR -> "wstr"
; riid : GUID* -> "var"
; enumHandlers : void** out -> "intptr"
; ※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 (
	shell32 = windows.NewLazySystemDLL("SHELL32.dll")
	procSHAssocEnumHandlersForProtocolByApplication = shell32.NewProc("SHAssocEnumHandlersForProtocolByApplication")
)

// protocol (LPCWSTR), riid (GUID*), enumHandlers (void** out)
r1, _, err := procSHAssocEnumHandlersForProtocolByApplication.Call(
	uintptr(unsafe.Pointer(windows.StringToUTF16Ptr(protocol))),
	uintptr(riid),
	uintptr(enumHandlers),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // HRESULT

function SHAssocEnumHandlersForProtocolByApplication(
  protocol: PWideChar;   // LPCWSTR
  riid: PGUID;   // GUID*
  enumHandlers: Pointer   // void** out
): Integer; stdcall;
  external 'SHELL32.dll' name 'SHAssocEnumHandlersForProtocolByApplication';

result := DllCall("SHELL32\SHAssocEnumHandlersForProtocolByApplication"
    , "WStr", protocol   ; LPCWSTR
    , "Ptr", riid   ; GUID*
    , "Ptr", enumHandlers   ; void** out
    , "Int")   ; return: HRESULT

●SHAssocEnumHandlersForProtocolByApplication(protocol, riid, enumHandlers) = DLL("SHELL32.dll", "int SHAssocEnumHandlersForProtocolByApplication(char*, void*, void*)")
# 呼び出し: SHAssocEnumHandlersForProtocolByApplication(protocol, riid, enumHandlers)
# protocol : LPCWSTR -> "char*"
# riid : GUID* -> "void*"
# enumHandlers : void** 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)。