GdipGetPenWidth

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

Status GdipGetPenWidth(
    GpPen* pen,
    FLOAT* width
);

<DllImport("gdiplus.dll", ExactSpelling:=True)>
Public Shared Function GdipGetPenWidth(
    pen As IntPtr,   ' GpPen* in/out
    ByRef width As Single   ' FLOAT* in/out
) As Integer
End Function

' pen : GpPen* in/out
' width : FLOAT* in/out
Declare PtrSafe Function GdipGetPenWidth Lib "gdiplus" ( _
    ByVal pen As LongPtr, _
    ByRef width As Single) As Long
' VBA7前提(PtrSafe)。32bit Office では LongPtr→Long。Integer=16bit / Long=32bit / LongLong=64bit。

import ctypes
from ctypes import wintypes

GdipGetPenWidth = ctypes.windll.gdiplus.GdipGetPenWidth
GdipGetPenWidth.restype = ctypes.c_int
GdipGetPenWidth.argtypes = [
    ctypes.c_void_p,  # pen : GpPen* in/out
    ctypes.POINTER(ctypes.c_float),  # width : FLOAT* in/out
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('gdiplus.dll')
GdipGetPenWidth = Fiddle::Function.new(
  lib['GdipGetPenWidth'],
  [
    Fiddle::TYPE_VOIDP,  # pen : GpPen* in/out
    Fiddle::TYPE_VOIDP,  # width : FLOAT* in/out
  ],
  Fiddle::TYPE_INT)

#[link(name = "gdiplus")]
extern "system" {
    fn GdipGetPenWidth(
        pen: *mut GpPen,  // GpPen* in/out
        width: *mut f32  // FLOAT* in/out
    ) -> i32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("gdiplus.dll")]
public static extern int GdipGetPenWidth(IntPtr pen, ref float width);
"@
$api = Add-Type -MemberDefinition $sig -Name 'gdiplus_GdipGetPenWidth' -Namespace Win32 -PassThru
# $api::GdipGetPenWidth(pen, width)

#uselib "gdiplus.dll"
#func global GdipGetPenWidth "GdipGetPenWidth" sptr, sptr
; GdipGetPenWidth varptr(pen), varptr(width)   ; 戻り値は stat
; pen : GpPen* in/out -> "sptr"
; width : FLOAT* 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 "gdiplus.dll"
#cfunc global GdipGetPenWidth "GdipGetPenWidth" var, var
; res = GdipGetPenWidth(pen, width)
; pen : GpPen* in/out -> "var"
; width : FLOAT* 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。

; Status GdipGetPenWidth(GpPen* pen, FLOAT* width)
#uselib "gdiplus.dll"
#cfunc global GdipGetPenWidth "GdipGetPenWidth" var, var
; res = GdipGetPenWidth(pen, width)
; pen : GpPen* in/out -> "var"
; width : FLOAT* 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 (
	gdiplus = windows.NewLazySystemDLL("gdiplus.dll")
	procGdipGetPenWidth = gdiplus.NewProc("GdipGetPenWidth")
)

// pen (GpPen* in/out), width (FLOAT* in/out)
r1, _, err := procGdipGetPenWidth.Call(
	uintptr(pen),
	uintptr(width),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // Status

function GdipGetPenWidth(
  pen: Pointer;   // GpPen* in/out
  width: Pointer   // FLOAT* in/out
): Integer; stdcall;
  external 'gdiplus.dll' name 'GdipGetPenWidth';

result := DllCall("gdiplus\GdipGetPenWidth"
    , "Ptr", pen   ; GpPen* in/out
    , "Ptr", width   ; FLOAT* in/out
    , "Int")   ; return: Status

●GdipGetPenWidth(pen, width) = DLL("gdiplus.dll", "int GdipGetPenWidth(void*, void*)")
# 呼び出し: GdipGetPenWidth(pen, width)
# pen : GpPen* in/out -> "void*"
# width : FLOAT* 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)。