MFGetWorkQueueMMCSSClass

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

HRESULT MFGetWorkQueueMMCSSClass(
    DWORD dwWorkQueueId,
    LPWSTR pwszClass,   // optional
    DWORD* pcchClass
);

<DllImport("MFPlat.dll", ExactSpelling:=True)>
Public Shared Function MFGetWorkQueueMMCSSClass(
    dwWorkQueueId As UInteger,   ' DWORD
    <MarshalAs(UnmanagedType.LPWStr)> pwszClass As System.Text.StringBuilder,   ' LPWSTR optional, out
    ByRef pcchClass As UInteger   ' DWORD* in/out
) As Integer
End Function

' dwWorkQueueId : DWORD
' pwszClass : LPWSTR optional, out
' pcchClass : DWORD* in/out
Declare PtrSafe Function MFGetWorkQueueMMCSSClass Lib "mfplat" ( _
    ByVal dwWorkQueueId As Long, _
    ByVal pwszClass As LongPtr, _
    ByRef pcchClass 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

MFGetWorkQueueMMCSSClass = ctypes.windll.mfplat.MFGetWorkQueueMMCSSClass
MFGetWorkQueueMMCSSClass.restype = ctypes.c_int
MFGetWorkQueueMMCSSClass.argtypes = [
    wintypes.DWORD,  # dwWorkQueueId : DWORD
    wintypes.LPWSTR,  # pwszClass : LPWSTR optional, out
    ctypes.POINTER(wintypes.DWORD),  # pcchClass : DWORD* in/out
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('MFPlat.dll')
MFGetWorkQueueMMCSSClass = Fiddle::Function.new(
  lib['MFGetWorkQueueMMCSSClass'],
  [
    -Fiddle::TYPE_INT,  # dwWorkQueueId : DWORD
    Fiddle::TYPE_VOIDP,  # pwszClass : LPWSTR optional, out
    Fiddle::TYPE_VOIDP,  # pcchClass : DWORD* in/out
  ],
  Fiddle::TYPE_INT)

#[link(name = "mfplat")]
extern "system" {
    fn MFGetWorkQueueMMCSSClass(
        dwWorkQueueId: u32,  // DWORD
        pwszClass: *mut u16,  // LPWSTR optional, out
        pcchClass: *mut u32  // DWORD* in/out
    ) -> i32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("MFPlat.dll")]
public static extern int MFGetWorkQueueMMCSSClass(uint dwWorkQueueId, [MarshalAs(UnmanagedType.LPWStr)] System.Text.StringBuilder pwszClass, ref uint pcchClass);
"@
$api = Add-Type -MemberDefinition $sig -Name 'MFPlat_MFGetWorkQueueMMCSSClass' -Namespace Win32 -PassThru
# $api::MFGetWorkQueueMMCSSClass(dwWorkQueueId, pwszClass, pcchClass)

#uselib "MFPlat.dll"
#func global MFGetWorkQueueMMCSSClass "MFGetWorkQueueMMCSSClass" sptr, sptr, sptr
; MFGetWorkQueueMMCSSClass dwWorkQueueId, varptr(pwszClass), varptr(pcchClass)   ; 戻り値は stat
; dwWorkQueueId : DWORD -> "sptr"
; pwszClass : LPWSTR optional, out -> "sptr"
; pcchClass : DWORD* 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 "MFPlat.dll"
#cfunc global MFGetWorkQueueMMCSSClass "MFGetWorkQueueMMCSSClass" int, var, var
; res = MFGetWorkQueueMMCSSClass(dwWorkQueueId, pwszClass, pcchClass)
; dwWorkQueueId : DWORD -> "int"
; pwszClass : LPWSTR optional, out -> "var"
; pcchClass : DWORD* 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。

; HRESULT MFGetWorkQueueMMCSSClass(DWORD dwWorkQueueId, LPWSTR pwszClass, DWORD* pcchClass)
#uselib "MFPlat.dll"
#cfunc global MFGetWorkQueueMMCSSClass "MFGetWorkQueueMMCSSClass" int, var, var
; res = MFGetWorkQueueMMCSSClass(dwWorkQueueId, pwszClass, pcchClass)
; dwWorkQueueId : DWORD -> "int"
; pwszClass : LPWSTR optional, out -> "var"
; pcchClass : DWORD* 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 (
	mfplat = windows.NewLazySystemDLL("MFPlat.dll")
	procMFGetWorkQueueMMCSSClass = mfplat.NewProc("MFGetWorkQueueMMCSSClass")
)

// dwWorkQueueId (DWORD), pwszClass (LPWSTR optional, out), pcchClass (DWORD* in/out)
r1, _, err := procMFGetWorkQueueMMCSSClass.Call(
	uintptr(dwWorkQueueId),
	uintptr(pwszClass),
	uintptr(pcchClass),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // HRESULT

function MFGetWorkQueueMMCSSClass(
  dwWorkQueueId: DWORD;   // DWORD
  pwszClass: PWideChar;   // LPWSTR optional, out
  pcchClass: Pointer   // DWORD* in/out
): Integer; stdcall;
  external 'MFPlat.dll' name 'MFGetWorkQueueMMCSSClass';

result := DllCall("MFPlat\MFGetWorkQueueMMCSSClass"
    , "UInt", dwWorkQueueId   ; DWORD
    , "Ptr", pwszClass   ; LPWSTR optional, out
    , "Ptr", pcchClass   ; DWORD* in/out
    , "Int")   ; return: HRESULT

●MFGetWorkQueueMMCSSClass(dwWorkQueueId, pwszClass, pcchClass) = DLL("MFPlat.dll", "int MFGetWorkQueueMMCSSClass(dword, char*, void*)")
# 呼び出し: MFGetWorkQueueMMCSSClass(dwWorkQueueId, pwszClass, pcchClass)
# dwWorkQueueId : DWORD -> "dword"
# pwszClass : LPWSTR optional, out -> "char*"
# pcchClass : DWORD* 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)。