D2D1Vec3Length

// d2d1.dll
#include <windows.h>

FLOAT D2D1Vec3Length(
    FLOAT x,
    FLOAT y,
    FLOAT z
);

<DllImport("d2d1.dll", ExactSpelling:=True)>
Public Shared Function D2D1Vec3Length(
    x As Single,   ' FLOAT
    y As Single,   ' FLOAT
    z As Single   ' FLOAT
) As Single
End Function

' x : FLOAT
' y : FLOAT
' z : FLOAT
Declare PtrSafe Function D2D1Vec3Length Lib "d2d1" ( _
    ByVal x As Single, _
    ByVal y As Single, _
    ByVal z As Single) As Single
' VBA7前提(PtrSafe)。32bit Office では LongPtr→Long。Integer=16bit / Long=32bit / LongLong=64bit。

import ctypes
from ctypes import wintypes

D2D1Vec3Length = ctypes.windll.d2d1.D2D1Vec3Length
D2D1Vec3Length.restype = ctypes.c_float
D2D1Vec3Length.argtypes = [
    ctypes.c_float,  # x : FLOAT
    ctypes.c_float,  # y : FLOAT
    ctypes.c_float,  # z : FLOAT
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('d2d1.dll')
D2D1Vec3Length = Fiddle::Function.new(
  lib['D2D1Vec3Length'],
  [
    Fiddle::TYPE_FLOAT,  # x : FLOAT
    Fiddle::TYPE_FLOAT,  # y : FLOAT
    Fiddle::TYPE_FLOAT,  # z : FLOAT
  ],
  Fiddle::TYPE_FLOAT)

#[link(name = "d2d1")]
extern "system" {
    fn D2D1Vec3Length(
        x: f32,  // FLOAT
        y: f32,  // FLOAT
        z: f32  // FLOAT
    ) -> f32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("d2d1.dll")]
public static extern float D2D1Vec3Length(float x, float y, float z);
"@
$api = Add-Type -MemberDefinition $sig -Name 'd2d1_D2D1Vec3Length' -Namespace Win32 -PassThru
# $api::D2D1Vec3Length(x, y, z)

#uselib "d2d1.dll"
#func global D2D1Vec3Length "D2D1Vec3Length" float, float, float
; D2D1Vec3Length x, y, z   ; 戻り値は stat
; x : FLOAT -> "float"
; y : FLOAT -> "float"
; z : FLOAT -> "float"
; ※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 "d2d1.dll"
#cfunc global D2D1Vec3Length "D2D1Vec3Length" float, float, float
; res = D2D1Vec3Length(x, y, z)
; x : FLOAT -> "float"
; y : FLOAT -> "float"
; z : FLOAT -> "float"

; FLOAT D2D1Vec3Length(FLOAT x, FLOAT y, FLOAT z)
#uselib "d2d1.dll"
#cfunc global D2D1Vec3Length "D2D1Vec3Length" float, float, float
; res = D2D1Vec3Length(x, y, z)
; x : FLOAT -> "float"
; y : FLOAT -> "float"
; z : FLOAT -> "float"

import (
	"math"
	"golang.org/x/sys/windows"
	"unsafe"
)

var (
	d2d1 = windows.NewLazySystemDLL("d2d1.dll")
	procD2D1Vec3Length = d2d1.NewProc("D2D1Vec3Length")
)

// x (FLOAT), y (FLOAT), z (FLOAT)
r1, _, err := procD2D1Vec3Length.Call(
	uintptr(math.Float32bits(x)),
	uintptr(math.Float32bits(y)),
	uintptr(math.Float32bits(z)),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // FLOAT
// 注意: float/double 引数は proc.Call では XMM レジスタに渡せません。
// windows.SyscallN(proc.Addr(), math.Float64bits(x), ...) もしくは cgo を使用してください。

function D2D1Vec3Length(
  x: Single;   // FLOAT
  y: Single;   // FLOAT
  z: Single   // FLOAT
): Single; stdcall;
  external 'd2d1.dll' name 'D2D1Vec3Length';

result := DllCall("d2d1\D2D1Vec3Length"
    , "Float", x   ; FLOAT
    , "Float", y   ; FLOAT
    , "Float", z   ; FLOAT
    , "Float")   ; return: FLOAT

●D2D1Vec3Length(x, y, z) = DLL("d2d1.dll", "float D2D1Vec3Length(float, float, float)")
# 呼び出し: D2D1Vec3Length(x, y, z)
# x : FLOAT -> "float"
# y : FLOAT -> "float"
# z : FLOAT -> "float"
# 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)。