GdipGetFontHeightGivenDPI

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

Status GdipGetFontHeightGivenDPI(
    const GpFont* font,
    FLOAT dpi,
    FLOAT* height
);

<DllImport("gdiplus.dll", ExactSpelling:=True)>
Public Shared Function GdipGetFontHeightGivenDPI(
    font As IntPtr,   ' GpFont*
    dpi As Single,   ' FLOAT
    ByRef height As Single   ' FLOAT* in/out
) As Integer
End Function

' font : GpFont*
' dpi : FLOAT
' height : FLOAT* in/out
Declare PtrSafe Function GdipGetFontHeightGivenDPI Lib "gdiplus" ( _
    ByVal font As LongPtr, _
    ByVal dpi As Single, _
    ByRef height 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

GdipGetFontHeightGivenDPI = ctypes.windll.gdiplus.GdipGetFontHeightGivenDPI
GdipGetFontHeightGivenDPI.restype = ctypes.c_int
GdipGetFontHeightGivenDPI.argtypes = [
    ctypes.c_void_p,  # font : GpFont*
    ctypes.c_float,  # dpi : FLOAT
    ctypes.POINTER(ctypes.c_float),  # height : FLOAT* in/out
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('gdiplus.dll')
GdipGetFontHeightGivenDPI = Fiddle::Function.new(
  lib['GdipGetFontHeightGivenDPI'],
  [
    Fiddle::TYPE_VOIDP,  # font : GpFont*
    Fiddle::TYPE_FLOAT,  # dpi : FLOAT
    Fiddle::TYPE_VOIDP,  # height : FLOAT* in/out
  ],
  Fiddle::TYPE_INT)

#[link(name = "gdiplus")]
extern "system" {
    fn GdipGetFontHeightGivenDPI(
        font: *const GpFont,  // GpFont*
        dpi: f32,  // FLOAT
        height: *mut f32  // FLOAT* in/out
    ) -> i32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("gdiplus.dll")]
public static extern int GdipGetFontHeightGivenDPI(IntPtr font, float dpi, ref float height);
"@
$api = Add-Type -MemberDefinition $sig -Name 'gdiplus_GdipGetFontHeightGivenDPI' -Namespace Win32 -PassThru
# $api::GdipGetFontHeightGivenDPI(font, dpi, height)

#uselib "gdiplus.dll"
#func global GdipGetFontHeightGivenDPI "GdipGetFontHeightGivenDPI" sptr, float, sptr
; GdipGetFontHeightGivenDPI varptr(font), dpi, varptr(height)   ; 戻り値は stat
; font : GpFont* -> "sptr"
; dpi : FLOAT -> "float"
; height : 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 GdipGetFontHeightGivenDPI "GdipGetFontHeightGivenDPI" var, float, var
; res = GdipGetFontHeightGivenDPI(font, dpi, height)
; font : GpFont* -> "var"
; dpi : FLOAT -> "float"
; height : 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 GdipGetFontHeightGivenDPI(GpFont* font, FLOAT dpi, FLOAT* height)
#uselib "gdiplus.dll"
#cfunc global GdipGetFontHeightGivenDPI "GdipGetFontHeightGivenDPI" var, float, var
; res = GdipGetFontHeightGivenDPI(font, dpi, height)
; font : GpFont* -> "var"
; dpi : FLOAT -> "float"
; height : 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 (
	"math"
	"golang.org/x/sys/windows"
	"unsafe"
)

var (
	gdiplus = windows.NewLazySystemDLL("gdiplus.dll")
	procGdipGetFontHeightGivenDPI = gdiplus.NewProc("GdipGetFontHeightGivenDPI")
)

// font (GpFont*), dpi (FLOAT), height (FLOAT* in/out)
r1, _, err := procGdipGetFontHeightGivenDPI.Call(
	uintptr(font),
	uintptr(math.Float32bits(dpi)),
	uintptr(height),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // Status
// 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 GdipGetFontHeightGivenDPI(
  font: Pointer;   // GpFont*
  dpi: Single;   // FLOAT
  height: Pointer   // FLOAT* in/out
): Integer; stdcall;
  external 'gdiplus.dll' name 'GdipGetFontHeightGivenDPI';

result := DllCall("gdiplus\GdipGetFontHeightGivenDPI"
    , "Ptr", font   ; GpFont*
    , "Float", dpi   ; FLOAT
    , "Ptr", height   ; FLOAT* in/out
    , "Int")   ; return: Status

●GdipGetFontHeightGivenDPI(font, dpi, height) = DLL("gdiplus.dll", "int GdipGetFontHeightGivenDPI(void*, float, void*)")
# 呼び出し: GdipGetFontHeightGivenDPI(font, dpi, height)
# font : GpFont* -> "void*"
# dpi : FLOAT -> "float"
# height : 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)。