FindMimeFromData

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

HRESULT FindMimeFromData(
    IBindCtx* pBC,   // optional
    LPCWSTR pwzUrl,   // optional
    void* pBuffer,   // optional
    DWORD cbSize,
    LPCWSTR pwzMimeProposed,   // optional
    DWORD dwMimeFlags,
    LPWSTR* ppwzMimeOut,
    DWORD dwReserved   // optional
);

<DllImport("urlmon.dll", ExactSpelling:=True)>
Public Shared Function FindMimeFromData(
    pBC As IntPtr,   ' IBindCtx* optional
    <MarshalAs(UnmanagedType.LPWStr)> pwzUrl As String,   ' LPCWSTR optional
    pBuffer As IntPtr,   ' void* optional
    cbSize As UInteger,   ' DWORD
    <MarshalAs(UnmanagedType.LPWStr)> pwzMimeProposed As String,   ' LPCWSTR optional
    dwMimeFlags As UInteger,   ' DWORD
    ppwzMimeOut As IntPtr,   ' LPWSTR* out
    dwReserved As UInteger   ' DWORD optional
) As Integer
End Function

' pBC : IBindCtx* optional
' pwzUrl : LPCWSTR optional
' pBuffer : void* optional
' cbSize : DWORD
' pwzMimeProposed : LPCWSTR optional
' dwMimeFlags : DWORD
' ppwzMimeOut : LPWSTR* out
' dwReserved : DWORD optional
Declare PtrSafe Function FindMimeFromData Lib "urlmon" ( _
    ByVal pBC As LongPtr, _
    ByVal pwzUrl As LongPtr, _
    ByVal pBuffer As LongPtr, _
    ByVal cbSize As Long, _
    ByVal pwzMimeProposed As LongPtr, _
    ByVal dwMimeFlags As Long, _
    ByVal ppwzMimeOut As LongPtr, _
    ByVal dwReserved 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

FindMimeFromData = ctypes.windll.urlmon.FindMimeFromData
FindMimeFromData.restype = ctypes.c_int
FindMimeFromData.argtypes = [
    ctypes.c_void_p,  # pBC : IBindCtx* optional
    wintypes.LPCWSTR,  # pwzUrl : LPCWSTR optional
    ctypes.POINTER(None),  # pBuffer : void* optional
    wintypes.DWORD,  # cbSize : DWORD
    wintypes.LPCWSTR,  # pwzMimeProposed : LPCWSTR optional
    wintypes.DWORD,  # dwMimeFlags : DWORD
    ctypes.c_void_p,  # ppwzMimeOut : LPWSTR* out
    wintypes.DWORD,  # dwReserved : DWORD optional
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('urlmon.dll')
FindMimeFromData = Fiddle::Function.new(
  lib['FindMimeFromData'],
  [
    Fiddle::TYPE_VOIDP,  # pBC : IBindCtx* optional
    Fiddle::TYPE_VOIDP,  # pwzUrl : LPCWSTR optional
    Fiddle::TYPE_VOIDP,  # pBuffer : void* optional
    -Fiddle::TYPE_INT,  # cbSize : DWORD
    Fiddle::TYPE_VOIDP,  # pwzMimeProposed : LPCWSTR optional
    -Fiddle::TYPE_INT,  # dwMimeFlags : DWORD
    Fiddle::TYPE_VOIDP,  # ppwzMimeOut : LPWSTR* out
    -Fiddle::TYPE_INT,  # dwReserved : DWORD optional
  ],
  Fiddle::TYPE_INT)

#[link(name = "urlmon")]
extern "system" {
    fn FindMimeFromData(
        pBC: *mut core::ffi::c_void,  // IBindCtx* optional
        pwzUrl: *const u16,  // LPCWSTR optional
        pBuffer: *mut (),  // void* optional
        cbSize: u32,  // DWORD
        pwzMimeProposed: *const u16,  // LPCWSTR optional
        dwMimeFlags: u32,  // DWORD
        ppwzMimeOut: *mut *mut u16,  // LPWSTR* out
        dwReserved: u32  // DWORD optional
    ) -> i32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("urlmon.dll")]
public static extern int FindMimeFromData(IntPtr pBC, [MarshalAs(UnmanagedType.LPWStr)] string pwzUrl, IntPtr pBuffer, uint cbSize, [MarshalAs(UnmanagedType.LPWStr)] string pwzMimeProposed, uint dwMimeFlags, IntPtr ppwzMimeOut, uint dwReserved);
"@
$api = Add-Type -MemberDefinition $sig -Name 'urlmon_FindMimeFromData' -Namespace Win32 -PassThru
# $api::FindMimeFromData(pBC, pwzUrl, pBuffer, cbSize, pwzMimeProposed, dwMimeFlags, ppwzMimeOut, dwReserved)

#uselib "urlmon.dll"
#func global FindMimeFromData "FindMimeFromData" sptr, sptr, sptr, sptr, sptr, sptr, sptr, sptr
; FindMimeFromData pBC, pwzUrl, pBuffer, cbSize, pwzMimeProposed, dwMimeFlags, varptr(ppwzMimeOut), dwReserved   ; 戻り値は stat
; pBC : IBindCtx* optional -> "sptr"
; pwzUrl : LPCWSTR optional -> "sptr"
; pBuffer : void* optional -> "sptr"
; cbSize : DWORD -> "sptr"
; pwzMimeProposed : LPCWSTR optional -> "sptr"
; dwMimeFlags : DWORD -> "sptr"
; ppwzMimeOut : LPWSTR* out -> "sptr"
; dwReserved : DWORD optional -> "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 "urlmon.dll"
#cfunc global FindMimeFromData "FindMimeFromData" sptr, wstr, sptr, int, wstr, int, var, int
; res = FindMimeFromData(pBC, pwzUrl, pBuffer, cbSize, pwzMimeProposed, dwMimeFlags, ppwzMimeOut, dwReserved)
; pBC : IBindCtx* optional -> "sptr"
; pwzUrl : LPCWSTR optional -> "wstr"
; pBuffer : void* optional -> "sptr"
; cbSize : DWORD -> "int"
; pwzMimeProposed : LPCWSTR optional -> "wstr"
; dwMimeFlags : DWORD -> "int"
; ppwzMimeOut : LPWSTR* out -> "var"
; dwReserved : DWORD optional -> "int"
; ※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 FindMimeFromData(IBindCtx* pBC, LPCWSTR pwzUrl, void* pBuffer, DWORD cbSize, LPCWSTR pwzMimeProposed, DWORD dwMimeFlags, LPWSTR* ppwzMimeOut, DWORD dwReserved)
#uselib "urlmon.dll"
#cfunc global FindMimeFromData "FindMimeFromData" intptr, wstr, intptr, int, wstr, int, var, int
; res = FindMimeFromData(pBC, pwzUrl, pBuffer, cbSize, pwzMimeProposed, dwMimeFlags, ppwzMimeOut, dwReserved)
; pBC : IBindCtx* optional -> "intptr"
; pwzUrl : LPCWSTR optional -> "wstr"
; pBuffer : void* optional -> "intptr"
; cbSize : DWORD -> "int"
; pwzMimeProposed : LPCWSTR optional -> "wstr"
; dwMimeFlags : DWORD -> "int"
; ppwzMimeOut : LPWSTR* out -> "var"
; dwReserved : DWORD optional -> "int"
; ※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 (
	urlmon = windows.NewLazySystemDLL("urlmon.dll")
	procFindMimeFromData = urlmon.NewProc("FindMimeFromData")
)

// pBC (IBindCtx* optional), pwzUrl (LPCWSTR optional), pBuffer (void* optional), cbSize (DWORD), pwzMimeProposed (LPCWSTR optional), dwMimeFlags (DWORD), ppwzMimeOut (LPWSTR* out), dwReserved (DWORD optional)
r1, _, err := procFindMimeFromData.Call(
	uintptr(pBC),
	uintptr(unsafe.Pointer(windows.StringToUTF16Ptr(pwzUrl))),
	uintptr(pBuffer),
	uintptr(cbSize),
	uintptr(unsafe.Pointer(windows.StringToUTF16Ptr(pwzMimeProposed))),
	uintptr(dwMimeFlags),
	uintptr(ppwzMimeOut),
	uintptr(dwReserved),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // HRESULT

function FindMimeFromData(
  pBC: Pointer;   // IBindCtx* optional
  pwzUrl: PWideChar;   // LPCWSTR optional
  pBuffer: Pointer;   // void* optional
  cbSize: DWORD;   // DWORD
  pwzMimeProposed: PWideChar;   // LPCWSTR optional
  dwMimeFlags: DWORD;   // DWORD
  ppwzMimeOut: PPWideChar;   // LPWSTR* out
  dwReserved: DWORD   // DWORD optional
): Integer; stdcall;
  external 'urlmon.dll' name 'FindMimeFromData';

result := DllCall("urlmon\FindMimeFromData"
    , "Ptr", pBC   ; IBindCtx* optional
    , "WStr", pwzUrl   ; LPCWSTR optional
    , "Ptr", pBuffer   ; void* optional
    , "UInt", cbSize   ; DWORD
    , "WStr", pwzMimeProposed   ; LPCWSTR optional
    , "UInt", dwMimeFlags   ; DWORD
    , "Ptr", ppwzMimeOut   ; LPWSTR* out
    , "UInt", dwReserved   ; DWORD optional
    , "Int")   ; return: HRESULT

●FindMimeFromData(pBC, pwzUrl, pBuffer, cbSize, pwzMimeProposed, dwMimeFlags, ppwzMimeOut, dwReserved) = DLL("urlmon.dll", "int FindMimeFromData(void*, char*, void*, dword, char*, dword, void*, dword)")
# 呼び出し: FindMimeFromData(pBC, pwzUrl, pBuffer, cbSize, pwzMimeProposed, dwMimeFlags, ppwzMimeOut, dwReserved)
# pBC : IBindCtx* optional -> "void*"
# pwzUrl : LPCWSTR optional -> "char*"
# pBuffer : void* optional -> "void*"
# cbSize : DWORD -> "dword"
# pwzMimeProposed : LPCWSTR optional -> "char*"
# dwMimeFlags : DWORD -> "dword"
# ppwzMimeOut : LPWSTR* out -> "void*"
# dwReserved : DWORD optional -> "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)。