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FindMimeFromData

関数

URLや実データの内容を解析してMIME型を判定する。

DLLurlmon.dll呼出規約winapi

シグネチャ

// 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
);

パラメーター

名前	型	方向	説明
pBC	IBindCtx*	inoptional	判定に使用するバインドコンテキスト(IBindCtx)へのポインタ。NULL可。
pwzUrl	LPCWSTR	inoptional	判定対象のURL文字列。NULL可。
pBuffer	void*	inoptional	判定に用いる実データ先頭バッファへのポインタ。NULL可。
cbSize	DWORD	in	pBufferのバイト数。
pwzMimeProposed	LPCWSTR	inoptional	候補となる提案MIMEタイプ文字列。NULL可。
dwMimeFlags	DWORD	in	判定動作を制御するフラグ。FMFD_*を指定する。
ppwzMimeOut	LPWSTR*	out	判定されたMIMEタイプ文字列を受け取る出力ポインタ。CoTaskMemFreeで解放する。
dwReserved	DWORD	optional	予約パラメータ。0を指定する必要がある。

戻り値の型: HRESULT

各言語での呼び出し定義

// 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)]
static extern int FindMimeFromData(
    IntPtr pBC,   // IBindCtx* optional
    [MarshalAs(UnmanagedType.LPWStr)] string pwzUrl,   // LPCWSTR optional
    IntPtr pBuffer,   // void* optional
    uint cbSize,   // DWORD
    [MarshalAs(UnmanagedType.LPWStr)] string pwzMimeProposed,   // LPCWSTR optional
    uint dwMimeFlags,   // DWORD
    IntPtr ppwzMimeOut,   // LPWSTR* out
    uint dwReserved   // DWORD 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。

出力引数:

#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。#uselib "urlmon.dll"
#cfunc global FindMimeFromData "FindMimeFromData" sptr, wstr, sptr, int, wstr, int, sptr, int
; res = FindMimeFromData(pBC, pwzUrl, pBuffer, cbSize, pwzMimeProposed, dwMimeFlags, varptr(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 -> "sptr"
; dwReserved : DWORD optional -> "int"
; ※出力/バッファ引数はポインタ方式(token=sptr / 呼び出しは varptr(変数))。

出力引数:

; 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。; 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, intptr, int
; res = FindMimeFromData(pBC, pwzUrl, pBuffer, cbSize, pwzMimeProposed, dwMimeFlags, varptr(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 -> "intptr"
; dwReserved : DWORD optional -> "int"
; ※出力/バッファ引数はポインタ方式(token=intptr / 呼び出しは varptr(変数))。

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)。

const std = @import("std");

extern "urlmon" fn FindMimeFromData(
    pBC: ?*anyopaque, // IBindCtx* optional
    pwzUrl: [*c]const u16, // LPCWSTR optional
    pBuffer: ?*anyopaque, // void* optional
    cbSize: u32, // DWORD
    pwzMimeProposed: [*c]const u16, // LPCWSTR optional
    dwMimeFlags: u32, // DWORD
    ppwzMimeOut: [*c][*c]u16, // LPWSTR* out
    dwReserved: u32 // DWORD optional
) callconv(std.os.windows.WINAPI) i32;

proc FindMimeFromData(
    pBC: pointer,  # IBindCtx* optional
    pwzUrl: WideCString,  # LPCWSTR optional
    pBuffer: pointer,  # void* optional
    cbSize: uint32,  # DWORD
    pwzMimeProposed: WideCString,  # LPCWSTR optional
    dwMimeFlags: uint32,  # DWORD
    ppwzMimeOut: ptr WideCString,  # LPWSTR* out
    dwReserved: uint32  # DWORD optional
): int32 {.importc: "FindMimeFromData", stdcall, dynlib: "urlmon.dll".}

pragma(lib, "urlmon");
extern(Windows)
int FindMimeFromData(
    void* pBC,   // IBindCtx* optional
    const(wchar)* pwzUrl,   // LPCWSTR optional
    void* pBuffer,   // void* optional
    uint cbSize,   // DWORD
    const(wchar)* pwzMimeProposed,   // LPCWSTR optional
    uint dwMimeFlags,   // DWORD
    wchar** ppwzMimeOut,   // LPWSTR* out
    uint dwReserved   // DWORD optional
);

ccall((:FindMimeFromData, "urlmon.dll"), stdcall, Int32,
      (Ptr{Cvoid}, Cwstring, Ptr{Cvoid}, UInt32, Cwstring, UInt32, Ptr{Ptr{UInt16}}, UInt32),
      pBC, pwzUrl, pBuffer, cbSize, pwzMimeProposed, dwMimeFlags, ppwzMimeOut, dwReserved)
# pBC : IBindCtx* optional -> Ptr{Cvoid}
# pwzUrl : LPCWSTR optional -> Cwstring
# pBuffer : void* optional -> Ptr{Cvoid}
# cbSize : DWORD -> UInt32
# pwzMimeProposed : LPCWSTR optional -> Cwstring
# dwMimeFlags : DWORD -> UInt32
# ppwzMimeOut : LPWSTR* out -> Ptr{Ptr{UInt16}}
# dwReserved : DWORD optional -> UInt32
# stdcall は 32bit のみ意味を持つ(x64 では無視)。

local ffi = require("ffi")
ffi.cdef[[
int32_t FindMimeFromData(
    void* pBC,
    const uint16_t* pwzUrl,
    void* pBuffer,
    uint32_t cbSize,
    const uint16_t* pwzMimeProposed,
    uint32_t dwMimeFlags,
    uint16_t** ppwzMimeOut,
    uint32_t dwReserved);
]]
local urlmon = ffi.load("urlmon")
-- urlmon.FindMimeFromData(pBC, pwzUrl, pBuffer, cbSize, pwzMimeProposed, dwMimeFlags, ppwzMimeOut, dwReserved)
-- pBC : IBindCtx* optional
-- pwzUrl : LPCWSTR optional
-- pBuffer : void* optional
-- cbSize : DWORD
-- pwzMimeProposed : LPCWSTR optional
-- dwMimeFlags : DWORD
-- ppwzMimeOut : LPWSTR* out
-- dwReserved : DWORD optional
-- 構造体/GUIDへのポインタは cdef が通るよう void* で表記(実型は各引数コメント参照)。値渡し構造体・enum は対応する typedef を cdef に追加すること。

const koffi = require('koffi');
const lib = koffi.load('urlmon.dll');
const FindMimeFromData = lib.func('__stdcall', 'FindMimeFromData', 'int32_t', ['void *', 'str16', 'void *', 'uint32_t', 'str16', 'uint32_t', 'void *', 'uint32_t']);
// FindMimeFromData(pBC, pwzUrl, pBuffer, cbSize, pwzMimeProposed, dwMimeFlags, ppwzMimeOut, dwReserved)
// pBC : IBindCtx* optional -> 'void *'
// pwzUrl : LPCWSTR optional -> 'str16'
// pBuffer : void* optional -> 'void *'
// cbSize : DWORD -> 'uint32_t'
// pwzMimeProposed : LPCWSTR optional -> 'str16'
// dwMimeFlags : DWORD -> 'uint32_t'
// ppwzMimeOut : LPWSTR* out -> 'void *'
// dwReserved : DWORD optional -> 'uint32_t'
// 出力ポインタは koffi.out(...) で包む。構造体は koffi.struct で定義。

const lib = Deno.dlopen("urlmon.dll", {
  FindMimeFromData: { parameters: ["pointer", "buffer", "pointer", "u32", "buffer", "u32", "pointer", "u32"], result: "i32" },
});
// lib.symbols.FindMimeFromData(pBC, pwzUrl, pBuffer, cbSize, pwzMimeProposed, dwMimeFlags, ppwzMimeOut, dwReserved)
// pBC : IBindCtx* optional -> "pointer"
// pwzUrl : LPCWSTR optional -> "buffer"
// pBuffer : void* optional -> "pointer"
// cbSize : DWORD -> "u32"
// pwzMimeProposed : LPCWSTR optional -> "buffer"
// dwMimeFlags : DWORD -> "u32"
// ppwzMimeOut : LPWSTR* out -> "pointer"
// dwReserved : DWORD optional -> "u32"
// 文字列引数は "buffer"(NUL 終端のバイト列を Uint8Array で渡す)。
// 値渡し構造体は { struct: [ ...field types... ] } を使用。

<?php
$ffi = FFI::cdef(<<<C
int32_t FindMimeFromData(
    void* pBC,
    const uint16_t* pwzUrl,
    void* pBuffer,
    uint32_t cbSize,
    const uint16_t* pwzMimeProposed,
    uint32_t dwMimeFlags,
    uint16_t** ppwzMimeOut,
    uint32_t dwReserved);
C, "urlmon.dll");
// $ffi->FindMimeFromData(pBC, pwzUrl, pBuffer, cbSize, pwzMimeProposed, dwMimeFlags, ppwzMimeOut, dwReserved);
// pBC : IBindCtx* optional
// pwzUrl : LPCWSTR optional
// pBuffer : void* optional
// cbSize : DWORD
// pwzMimeProposed : LPCWSTR optional
// dwMimeFlags : DWORD
// ppwzMimeOut : LPWSTR* out
// dwReserved : DWORD optional
// 構造体/GUIDへのポインタは cdef が通るよう void* で表記(実型は各引数コメント参照)。値渡し構造体・enum は対応する typedef を cdef に追加すること。
// WINAPI(stdcall): x64 では呼出規約が統一されるため問題なし。x86 では __stdcall 対応のラッパが必要な場合あり。

import com.sun.jna.*;
import com.sun.jna.ptr.*;
import com.sun.jna.win32.StdCallLibrary;
import com.sun.jna.win32.W32APIOptions;

public interface Urlmon extends StdCallLibrary {
    Urlmon INSTANCE = Native.load("urlmon", Urlmon.class);
    int FindMimeFromData(
        Pointer pBC,   // IBindCtx* optional
        WString pwzUrl,   // LPCWSTR optional
        Pointer pBuffer,   // void* optional
        int cbSize,   // DWORD
        WString pwzMimeProposed,   // LPCWSTR optional
        int dwMimeFlags,   // DWORD
        PointerByReference ppwzMimeOut,   // LPWSTR* out
        int dwReserved   // DWORD optional
    );
}

@[Link("urlmon")]
lib Liburlmon
  fun FindMimeFromData = FindMimeFromData(
    pBC : Void*,   # IBindCtx* optional
    pwzUrl : UInt16*,   # LPCWSTR optional
    pBuffer : Void*,   # void* optional
    cbSize : UInt32,   # DWORD
    pwzMimeProposed : UInt16*,   # LPCWSTR optional
    dwMimeFlags : UInt32,   # DWORD
    ppwzMimeOut : UInt16**,   # LPWSTR* out
    dwReserved : UInt32   # DWORD optional
  ) : Int32
end
# 構造体/GUID/enum は lib 内に対応する型定義が必要。
# 呼出規約: x64 は規約統一のため OK。x86(32bit)は WINAPI=stdcall だが Crystal の fun に stdcall 付与構文がなく非対応。

import 'dart:ffi';
import 'package:ffi/ffi.dart';

typedef FindMimeFromDataNative = Int32 Function(Pointer<Void>, Pointer<Utf16>, Pointer<Void>, Uint32, Pointer<Utf16>, Uint32, Pointer<Pointer<Utf16>>, Uint32);
typedef FindMimeFromDataDart = int Function(Pointer<Void>, Pointer<Utf16>, Pointer<Void>, int, Pointer<Utf16>, int, Pointer<Pointer<Utf16>>, int);
final FindMimeFromData = DynamicLibrary.open('urlmon.dll')
    .lookupFunction<FindMimeFromDataNative, FindMimeFromDataDart>('FindMimeFromData');
// pBC : IBindCtx* optional -> Pointer<Void>
// pwzUrl : LPCWSTR optional -> Pointer<Utf16>
// pBuffer : void* optional -> Pointer<Void>
// cbSize : DWORD -> Uint32
// pwzMimeProposed : LPCWSTR optional -> Pointer<Utf16>
// dwMimeFlags : DWORD -> Uint32
// ppwzMimeOut : LPWSTR* out -> Pointer<Pointer<Utf16>>
// dwReserved : DWORD optional -> Uint32
// 文字列は package:ffi の "...".toNativeUtf16()/toNativeUtf8() で変換。

{$mode objfpc}{$H+}
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';

import Foreign
import Foreign.C.Types
import Foreign.C.String

foreign import stdcall safe "FindMimeFromData"
  c_FindMimeFromData :: Ptr () -> CWString -> Ptr () -> Word32 -> CWString -> Word32 -> Ptr CWString -> Word32 -> IO Int32
-- pBC : IBindCtx* optional -> Ptr ()
-- pwzUrl : LPCWSTR optional -> CWString
-- pBuffer : void* optional -> Ptr ()
-- cbSize : DWORD -> Word32
-- pwzMimeProposed : LPCWSTR optional -> CWString
-- dwMimeFlags : DWORD -> Word32
-- ppwzMimeOut : LPWSTR* out -> Ptr CWString
-- dwReserved : DWORD optional -> Word32
-- 要 GHC(Windows)。stdcall は x64 では ccall として扱われる。ブロックする API は safe 呼び出し推奨。

open Ctypes
open Foreign

let findmimefromdata =
  foreign "FindMimeFromData"
    ((ptr void) @-> (ptr uint16_t) @-> (ptr void) @-> uint32_t @-> (ptr uint16_t) @-> uint32_t @-> (ptr (ptr uint16_t)) @-> uint32_t @-> returning int32_t)
(* pBC : IBindCtx* optional -> (ptr void) *)
(* pwzUrl : LPCWSTR optional -> (ptr uint16_t) *)
(* pBuffer : void* optional -> (ptr void) *)
(* cbSize : DWORD -> uint32_t *)
(* pwzMimeProposed : LPCWSTR optional -> (ptr uint16_t) *)
(* dwMimeFlags : DWORD -> uint32_t *)
(* ppwzMimeOut : LPWSTR* out -> (ptr (ptr uint16_t)) *)
(* dwReserved : DWORD optional -> uint32_t *)
(* foreign は cdecl 前提。x64 Windows では WINAPI と一致。構造体は ctypes structure を定義のこと。 *)

(cffi:define-foreign-library urlmon (t "urlmon.dll"))
(cffi:use-foreign-library urlmon)

(cffi:defcfun ("FindMimeFromData" find-mime-from-data :convention :stdcall) :int32
  (p-bc :pointer)   ; IBindCtx* optional
  (pwz-url (:string :encoding :utf-16le))   ; LPCWSTR optional
  (p-buffer :pointer)   ; void* optional
  (cb-size :uint32)   ; DWORD
  (pwz-mime-proposed (:string :encoding :utf-16le))   ; LPCWSTR optional
  (dw-mime-flags :uint32)   ; DWORD
  (ppwz-mime-out :pointer)   ; LPWSTR* out
  (dw-reserved :uint32))   ; DWORD optional
; isize/usize(INT_PTR/SIZE_T)は x64 前提で :int64/:uint64。x86 では :int32/:uint32。

use Win32::API;
my $FindMimeFromData = Win32::API::More->new('urlmon',
    'int FindMimeFromData(LPVOID pBC, LPCWSTR pwzUrl, LPVOID pBuffer, DWORD cbSize, LPCWSTR pwzMimeProposed, DWORD dwMimeFlags, LPVOID ppwzMimeOut, DWORD dwReserved)');
# my $ret = $FindMimeFromData->Call($pBC, $pwzUrl, $pBuffer, $cbSize, $pwzMimeProposed, $dwMimeFlags, $ppwzMimeOut, $dwReserved);
# pBC : IBindCtx* optional -> LPVOID
# pwzUrl : LPCWSTR optional -> LPCWSTR
# pBuffer : void* optional -> LPVOID
# cbSize : DWORD -> DWORD
# pwzMimeProposed : LPCWSTR optional -> LPCWSTR
# dwMimeFlags : DWORD -> DWORD
# ppwzMimeOut : LPWSTR* out -> LPVOID
# dwReserved : DWORD optional -> DWORD
# 値渡し構造体は pack() した文字列、または Win32::API::Struct を使用。

FindMimeFromData

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