ObtainUserAgentString

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

HRESULT ObtainUserAgentString(
    DWORD dwOption,
    LPSTR pszUAOut,
    DWORD* cbSize
);

<DllImport("urlmon.dll", ExactSpelling:=True)>
Public Shared Function ObtainUserAgentString(
    dwOption As UInteger,   ' DWORD
    <MarshalAs(UnmanagedType.LPStr)> pszUAOut As System.Text.StringBuilder,   ' LPSTR out
    ByRef cbSize As UInteger   ' DWORD* in/out
) As Integer
End Function

' dwOption : DWORD
' pszUAOut : LPSTR out
' cbSize : DWORD* in/out
Declare PtrSafe Function ObtainUserAgentString Lib "urlmon" ( _
    ByVal dwOption As Long, _
    ByVal pszUAOut As String, _
    ByRef cbSize 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

ObtainUserAgentString = ctypes.windll.urlmon.ObtainUserAgentString
ObtainUserAgentString.restype = ctypes.c_int
ObtainUserAgentString.argtypes = [
    wintypes.DWORD,  # dwOption : DWORD
    wintypes.LPSTR,  # pszUAOut : LPSTR out
    ctypes.POINTER(wintypes.DWORD),  # cbSize : DWORD* in/out
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('urlmon.dll')
ObtainUserAgentString = Fiddle::Function.new(
  lib['ObtainUserAgentString'],
  [
    -Fiddle::TYPE_INT,  # dwOption : DWORD
    Fiddle::TYPE_VOIDP,  # pszUAOut : LPSTR out
    Fiddle::TYPE_VOIDP,  # cbSize : DWORD* in/out
  ],
  Fiddle::TYPE_INT)

#[link(name = "urlmon")]
extern "system" {
    fn ObtainUserAgentString(
        dwOption: u32,  // DWORD
        pszUAOut: *mut u8,  // LPSTR out
        cbSize: *mut u32  // DWORD* in/out
    ) -> i32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("urlmon.dll")]
public static extern int ObtainUserAgentString(uint dwOption, [MarshalAs(UnmanagedType.LPStr)] System.Text.StringBuilder pszUAOut, ref uint cbSize);
"@
$api = Add-Type -MemberDefinition $sig -Name 'urlmon_ObtainUserAgentString' -Namespace Win32 -PassThru
# $api::ObtainUserAgentString(dwOption, pszUAOut, cbSize)

#uselib "urlmon.dll"
#func global ObtainUserAgentString "ObtainUserAgentString" sptr, sptr, sptr
; ObtainUserAgentString dwOption, varptr(pszUAOut), varptr(cbSize)   ; 戻り値は stat
; dwOption : DWORD -> "sptr"
; pszUAOut : LPSTR out -> "sptr"
; cbSize : 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 "urlmon.dll"
#cfunc global ObtainUserAgentString "ObtainUserAgentString" int, var, var
; res = ObtainUserAgentString(dwOption, pszUAOut, cbSize)
; dwOption : DWORD -> "int"
; pszUAOut : LPSTR out -> "var"
; cbSize : 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 ObtainUserAgentString(DWORD dwOption, LPSTR pszUAOut, DWORD* cbSize)
#uselib "urlmon.dll"
#cfunc global ObtainUserAgentString "ObtainUserAgentString" int, var, var
; res = ObtainUserAgentString(dwOption, pszUAOut, cbSize)
; dwOption : DWORD -> "int"
; pszUAOut : LPSTR out -> "var"
; cbSize : 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 (
	urlmon = windows.NewLazySystemDLL("urlmon.dll")
	procObtainUserAgentString = urlmon.NewProc("ObtainUserAgentString")
)

// dwOption (DWORD), pszUAOut (LPSTR out), cbSize (DWORD* in/out)
r1, _, err := procObtainUserAgentString.Call(
	uintptr(dwOption),
	uintptr(pszUAOut),
	uintptr(cbSize),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // HRESULT

function ObtainUserAgentString(
  dwOption: DWORD;   // DWORD
  pszUAOut: PAnsiChar;   // LPSTR out
  cbSize: Pointer   // DWORD* in/out
): Integer; stdcall;
  external 'urlmon.dll' name 'ObtainUserAgentString';

result := DllCall("urlmon\ObtainUserAgentString"
    , "UInt", dwOption   ; DWORD
    , "Ptr", pszUAOut   ; LPSTR out
    , "Ptr", cbSize   ; DWORD* in/out
    , "Int")   ; return: HRESULT

●ObtainUserAgentString(dwOption, pszUAOut, cbSize) = DLL("urlmon.dll", "int ObtainUserAgentString(dword, char*, void*)")
# 呼び出し: ObtainUserAgentString(dwOption, pszUAOut, cbSize)
# dwOption : DWORD -> "dword"
# pszUAOut : LPSTR out -> "char*"
# cbSize : 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)。