CreateFontA

// GDI32.dll  (ANSI / -A)
#include <windows.h>

HFONT CreateFontA(
    INT cHeight,
    INT cWidth,
    INT cEscapement,
    INT cOrientation,
    INT cWeight,
    DWORD bItalic,
    DWORD bUnderline,
    DWORD bStrikeOut,
    DWORD iCharSet,
    DWORD iOutPrecision,
    DWORD iClipPrecision,
    DWORD iQuality,
    DWORD iPitchAndFamily,
    LPCSTR pszFaceName   // optional
);

<DllImport("GDI32.dll", CharSet:=CharSet.Ansi, ExactSpelling:=True)>
Public Shared Function CreateFontA(
    cHeight As Integer,   ' INT
    cWidth As Integer,   ' INT
    cEscapement As Integer,   ' INT
    cOrientation As Integer,   ' INT
    cWeight As Integer,   ' INT
    bItalic As UInteger,   ' DWORD
    bUnderline As UInteger,   ' DWORD
    bStrikeOut As UInteger,   ' DWORD
    iCharSet As UInteger,   ' DWORD
    iOutPrecision As UInteger,   ' DWORD
    iClipPrecision As UInteger,   ' DWORD
    iQuality As UInteger,   ' DWORD
    iPitchAndFamily As UInteger,   ' DWORD
    <MarshalAs(UnmanagedType.LPStr)> pszFaceName As String   ' LPCSTR optional
) As IntPtr
End Function

' cHeight : INT
' cWidth : INT
' cEscapement : INT
' cOrientation : INT
' cWeight : INT
' bItalic : DWORD
' bUnderline : DWORD
' bStrikeOut : DWORD
' iCharSet : DWORD
' iOutPrecision : DWORD
' iClipPrecision : DWORD
' iQuality : DWORD
' iPitchAndFamily : DWORD
' pszFaceName : LPCSTR optional
Declare PtrSafe Function CreateFontA Lib "gdi32" ( _
    ByVal cHeight As Long, _
    ByVal cWidth As Long, _
    ByVal cEscapement As Long, _
    ByVal cOrientation As Long, _
    ByVal cWeight As Long, _
    ByVal bItalic As Long, _
    ByVal bUnderline As Long, _
    ByVal bStrikeOut As Long, _
    ByVal iCharSet As Long, _
    ByVal iOutPrecision As Long, _
    ByVal iClipPrecision As Long, _
    ByVal iQuality As Long, _
    ByVal iPitchAndFamily As Long, _
    ByVal pszFaceName As String) As LongPtr
' VBA7前提(PtrSafe)。32bit Office では LongPtr→Long。Integer=16bit / Long=32bit / LongLong=64bit。

import ctypes
from ctypes import wintypes

CreateFontA = ctypes.windll.gdi32.CreateFontA
CreateFontA.restype = ctypes.c_void_p
CreateFontA.argtypes = [
    ctypes.c_int,  # cHeight : INT
    ctypes.c_int,  # cWidth : INT
    ctypes.c_int,  # cEscapement : INT
    ctypes.c_int,  # cOrientation : INT
    ctypes.c_int,  # cWeight : INT
    wintypes.DWORD,  # bItalic : DWORD
    wintypes.DWORD,  # bUnderline : DWORD
    wintypes.DWORD,  # bStrikeOut : DWORD
    wintypes.DWORD,  # iCharSet : DWORD
    wintypes.DWORD,  # iOutPrecision : DWORD
    wintypes.DWORD,  # iClipPrecision : DWORD
    wintypes.DWORD,  # iQuality : DWORD
    wintypes.DWORD,  # iPitchAndFamily : DWORD
    wintypes.LPCSTR,  # pszFaceName : LPCSTR optional
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('GDI32.dll')
CreateFontA = Fiddle::Function.new(
  lib['CreateFontA'],
  [
    Fiddle::TYPE_INT,  # cHeight : INT
    Fiddle::TYPE_INT,  # cWidth : INT
    Fiddle::TYPE_INT,  # cEscapement : INT
    Fiddle::TYPE_INT,  # cOrientation : INT
    Fiddle::TYPE_INT,  # cWeight : INT
    -Fiddle::TYPE_INT,  # bItalic : DWORD
    -Fiddle::TYPE_INT,  # bUnderline : DWORD
    -Fiddle::TYPE_INT,  # bStrikeOut : DWORD
    -Fiddle::TYPE_INT,  # iCharSet : DWORD
    -Fiddle::TYPE_INT,  # iOutPrecision : DWORD
    -Fiddle::TYPE_INT,  # iClipPrecision : DWORD
    -Fiddle::TYPE_INT,  # iQuality : DWORD
    -Fiddle::TYPE_INT,  # iPitchAndFamily : DWORD
    Fiddle::TYPE_VOIDP,  # pszFaceName : LPCSTR optional
  ],
  Fiddle::TYPE_VOIDP)

#[link(name = "gdi32")]
extern "system" {
    fn CreateFontA(
        cHeight: i32,  // INT
        cWidth: i32,  // INT
        cEscapement: i32,  // INT
        cOrientation: i32,  // INT
        cWeight: i32,  // INT
        bItalic: u32,  // DWORD
        bUnderline: u32,  // DWORD
        bStrikeOut: u32,  // DWORD
        iCharSet: u32,  // DWORD
        iOutPrecision: u32,  // DWORD
        iClipPrecision: u32,  // DWORD
        iQuality: u32,  // DWORD
        iPitchAndFamily: u32,  // DWORD
        pszFaceName: *const u8  // LPCSTR optional
    ) -> *mut core::ffi::c_void;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("GDI32.dll", CharSet = CharSet.Ansi)]
public static extern IntPtr CreateFontA(int cHeight, int cWidth, int cEscapement, int cOrientation, int cWeight, uint bItalic, uint bUnderline, uint bStrikeOut, uint iCharSet, uint iOutPrecision, uint iClipPrecision, uint iQuality, uint iPitchAndFamily, [MarshalAs(UnmanagedType.LPStr)] string pszFaceName);
"@
$api = Add-Type -MemberDefinition $sig -Name 'GDI32_CreateFontA' -Namespace Win32 -PassThru
# $api::CreateFontA(cHeight, cWidth, cEscapement, cOrientation, cWeight, bItalic, bUnderline, bStrikeOut, iCharSet, iOutPrecision, iClipPrecision, iQuality, iPitchAndFamily, pszFaceName)

#uselib "GDI32.dll"
#func global CreateFontA "CreateFontA" sptr, sptr, sptr, sptr, sptr, sptr, sptr, sptr, sptr, sptr, sptr, sptr, sptr, sptr
; CreateFontA cHeight, cWidth, cEscapement, cOrientation, cWeight, bItalic, bUnderline, bStrikeOut, iCharSet, iOutPrecision, iClipPrecision, iQuality, iPitchAndFamily, pszFaceName   ; 戻り値は stat
; cHeight : INT -> "sptr"
; cWidth : INT -> "sptr"
; cEscapement : INT -> "sptr"
; cOrientation : INT -> "sptr"
; cWeight : INT -> "sptr"
; bItalic : DWORD -> "sptr"
; bUnderline : DWORD -> "sptr"
; bStrikeOut : DWORD -> "sptr"
; iCharSet : DWORD -> "sptr"
; iOutPrecision : DWORD -> "sptr"
; iClipPrecision : DWORD -> "sptr"
; iQuality : DWORD -> "sptr"
; iPitchAndFamily : DWORD -> "sptr"
; pszFaceName : LPCSTR 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。

#uselib "GDI32.dll"
#cfunc global CreateFontA "CreateFontA" int, int, int, int, int, int, int, int, int, int, int, int, int, str
; res = CreateFontA(cHeight, cWidth, cEscapement, cOrientation, cWeight, bItalic, bUnderline, bStrikeOut, iCharSet, iOutPrecision, iClipPrecision, iQuality, iPitchAndFamily, pszFaceName)
; cHeight : INT -> "int"
; cWidth : INT -> "int"
; cEscapement : INT -> "int"
; cOrientation : INT -> "int"
; cWeight : INT -> "int"
; bItalic : DWORD -> "int"
; bUnderline : DWORD -> "int"
; bStrikeOut : DWORD -> "int"
; iCharSet : DWORD -> "int"
; iOutPrecision : DWORD -> "int"
; iClipPrecision : DWORD -> "int"
; iQuality : DWORD -> "int"
; iPitchAndFamily : DWORD -> "int"
; pszFaceName : LPCSTR optional -> "str"

; HFONT CreateFontA(INT cHeight, INT cWidth, INT cEscapement, INT cOrientation, INT cWeight, DWORD bItalic, DWORD bUnderline, DWORD bStrikeOut, DWORD iCharSet, DWORD iOutPrecision, DWORD iClipPrecision, DWORD iQuality, DWORD iPitchAndFamily, LPCSTR pszFaceName)
#uselib "GDI32.dll"
#cfunc global CreateFontA "CreateFontA" int, int, int, int, int, int, int, int, int, int, int, int, int, str
; res = CreateFontA(cHeight, cWidth, cEscapement, cOrientation, cWeight, bItalic, bUnderline, bStrikeOut, iCharSet, iOutPrecision, iClipPrecision, iQuality, iPitchAndFamily, pszFaceName)
; cHeight : INT -> "int"
; cWidth : INT -> "int"
; cEscapement : INT -> "int"
; cOrientation : INT -> "int"
; cWeight : INT -> "int"
; bItalic : DWORD -> "int"
; bUnderline : DWORD -> "int"
; bStrikeOut : DWORD -> "int"
; iCharSet : DWORD -> "int"
; iOutPrecision : DWORD -> "int"
; iClipPrecision : DWORD -> "int"
; iQuality : DWORD -> "int"
; iPitchAndFamily : DWORD -> "int"
; pszFaceName : LPCSTR optional -> "str"

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

var (
	gdi32 = windows.NewLazySystemDLL("GDI32.dll")
	procCreateFontA = gdi32.NewProc("CreateFontA")
)

// cHeight (INT), cWidth (INT), cEscapement (INT), cOrientation (INT), cWeight (INT), bItalic (DWORD), bUnderline (DWORD), bStrikeOut (DWORD), iCharSet (DWORD), iOutPrecision (DWORD), iClipPrecision (DWORD), iQuality (DWORD), iPitchAndFamily (DWORD), pszFaceName (LPCSTR optional)
r1, _, err := procCreateFontA.Call(
	uintptr(cHeight),
	uintptr(cWidth),
	uintptr(cEscapement),
	uintptr(cOrientation),
	uintptr(cWeight),
	uintptr(bItalic),
	uintptr(bUnderline),
	uintptr(bStrikeOut),
	uintptr(iCharSet),
	uintptr(iOutPrecision),
	uintptr(iClipPrecision),
	uintptr(iQuality),
	uintptr(iPitchAndFamily),
	uintptr(unsafe.Pointer(windows.BytePtrFromString(pszFaceName))),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // HFONT

function CreateFontA(
  cHeight: Integer;   // INT
  cWidth: Integer;   // INT
  cEscapement: Integer;   // INT
  cOrientation: Integer;   // INT
  cWeight: Integer;   // INT
  bItalic: DWORD;   // DWORD
  bUnderline: DWORD;   // DWORD
  bStrikeOut: DWORD;   // DWORD
  iCharSet: DWORD;   // DWORD
  iOutPrecision: DWORD;   // DWORD
  iClipPrecision: DWORD;   // DWORD
  iQuality: DWORD;   // DWORD
  iPitchAndFamily: DWORD;   // DWORD
  pszFaceName: PAnsiChar   // LPCSTR optional
): THandle; stdcall;
  external 'GDI32.dll' name 'CreateFontA';

result := DllCall("GDI32\CreateFontA"
    , "Int", cHeight   ; INT
    , "Int", cWidth   ; INT
    , "Int", cEscapement   ; INT
    , "Int", cOrientation   ; INT
    , "Int", cWeight   ; INT
    , "UInt", bItalic   ; DWORD
    , "UInt", bUnderline   ; DWORD
    , "UInt", bStrikeOut   ; DWORD
    , "UInt", iCharSet   ; DWORD
    , "UInt", iOutPrecision   ; DWORD
    , "UInt", iClipPrecision   ; DWORD
    , "UInt", iQuality   ; DWORD
    , "UInt", iPitchAndFamily   ; DWORD
    , "AStr", pszFaceName   ; LPCSTR optional
    , "Ptr")   ; return: HFONT

●CreateFontA(cHeight, cWidth, cEscapement, cOrientation, cWeight, bItalic, bUnderline, bStrikeOut, iCharSet, iOutPrecision, iClipPrecision, iQuality, iPitchAndFamily, pszFaceName) = DLL("GDI32.dll", "void* CreateFontA(int, int, int, int, int, dword, dword, dword, dword, dword, dword, dword, dword, char*)")
# 呼び出し: CreateFontA(cHeight, cWidth, cEscapement, cOrientation, cWeight, bItalic, bUnderline, bStrikeOut, iCharSet, iOutPrecision, iClipPrecision, iQuality, iPitchAndFamily, pszFaceName)
# cHeight : INT -> "int"
# cWidth : INT -> "int"
# cEscapement : INT -> "int"
# cOrientation : INT -> "int"
# cWeight : INT -> "int"
# bItalic : DWORD -> "dword"
# bUnderline : DWORD -> "dword"
# bStrikeOut : DWORD -> "dword"
# iCharSet : DWORD -> "dword"
# iOutPrecision : DWORD -> "dword"
# iClipPrecision : DWORD -> "dword"
# iQuality : DWORD -> "dword"
# iPitchAndFamily : DWORD -> "dword"
# pszFaceName : LPCSTR optional -> "char*"
# 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 "gdi32" fn CreateFontA(
    cHeight: i32, // INT
    cWidth: i32, // INT
    cEscapement: i32, // INT
    cOrientation: i32, // INT
    cWeight: i32, // INT
    bItalic: u32, // DWORD
    bUnderline: u32, // DWORD
    bStrikeOut: u32, // DWORD
    iCharSet: u32, // DWORD
    iOutPrecision: u32, // DWORD
    iClipPrecision: u32, // DWORD
    iQuality: u32, // DWORD
    iPitchAndFamily: u32, // DWORD
    pszFaceName: [*c]const u8 // LPCSTR optional
) callconv(std.os.windows.WINAPI) ?*anyopaque;

proc CreateFontA(
    cHeight: int32,  # INT
    cWidth: int32,  # INT
    cEscapement: int32,  # INT
    cOrientation: int32,  # INT
    cWeight: int32,  # INT
    bItalic: uint32,  # DWORD
    bUnderline: uint32,  # DWORD
    bStrikeOut: uint32,  # DWORD
    iCharSet: uint32,  # DWORD
    iOutPrecision: uint32,  # DWORD
    iClipPrecision: uint32,  # DWORD
    iQuality: uint32,  # DWORD
    iPitchAndFamily: uint32,  # DWORD
    pszFaceName: cstring  # LPCSTR optional
): pointer {.importc: "CreateFontA", stdcall, dynlib: "GDI32.dll".}

pragma(lib, "gdi32");
extern(Windows)
void* CreateFontA(
    int cHeight,   // INT
    int cWidth,   // INT
    int cEscapement,   // INT
    int cOrientation,   // INT
    int cWeight,   // INT
    uint bItalic,   // DWORD
    uint bUnderline,   // DWORD
    uint bStrikeOut,   // DWORD
    uint iCharSet,   // DWORD
    uint iOutPrecision,   // DWORD
    uint iClipPrecision,   // DWORD
    uint iQuality,   // DWORD
    uint iPitchAndFamily,   // DWORD
    const(char)* pszFaceName   // LPCSTR optional
);

ccall((:CreateFontA, "GDI32.dll"), stdcall, Ptr{Cvoid},
      (Int32, Int32, Int32, Int32, Int32, UInt32, UInt32, UInt32, UInt32, UInt32, UInt32, UInt32, UInt32, Cstring),
      cHeight, cWidth, cEscapement, cOrientation, cWeight, bItalic, bUnderline, bStrikeOut, iCharSet, iOutPrecision, iClipPrecision, iQuality, iPitchAndFamily, pszFaceName)
# cHeight : INT -> Int32
# cWidth : INT -> Int32
# cEscapement : INT -> Int32
# cOrientation : INT -> Int32
# cWeight : INT -> Int32
# bItalic : DWORD -> UInt32
# bUnderline : DWORD -> UInt32
# bStrikeOut : DWORD -> UInt32
# iCharSet : DWORD -> UInt32
# iOutPrecision : DWORD -> UInt32
# iClipPrecision : DWORD -> UInt32
# iQuality : DWORD -> UInt32
# iPitchAndFamily : DWORD -> UInt32
# pszFaceName : LPCSTR optional -> Cstring
# stdcall は 32bit のみ意味を持つ(x64 では無視)。

local ffi = require("ffi")
ffi.cdef[[
void* CreateFontA(
    int32_t cHeight,
    int32_t cWidth,
    int32_t cEscapement,
    int32_t cOrientation,
    int32_t cWeight,
    uint32_t bItalic,
    uint32_t bUnderline,
    uint32_t bStrikeOut,
    uint32_t iCharSet,
    uint32_t iOutPrecision,
    uint32_t iClipPrecision,
    uint32_t iQuality,
    uint32_t iPitchAndFamily,
    const char* pszFaceName);
]]
local gdi32 = ffi.load("gdi32")
-- gdi32.CreateFontA(cHeight, cWidth, cEscapement, cOrientation, cWeight, bItalic, bUnderline, bStrikeOut, iCharSet, iOutPrecision, iClipPrecision, iQuality, iPitchAndFamily, pszFaceName)
-- cHeight : INT
-- cWidth : INT
-- cEscapement : INT
-- cOrientation : INT
-- cWeight : INT
-- bItalic : DWORD
-- bUnderline : DWORD
-- bStrikeOut : DWORD
-- iCharSet : DWORD
-- iOutPrecision : DWORD
-- iClipPrecision : DWORD
-- iQuality : DWORD
-- iPitchAndFamily : DWORD
-- pszFaceName : LPCSTR 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('GDI32.dll');
const CreateFontA = lib.func('__stdcall', 'CreateFontA', 'void *', ['int32_t', 'int32_t', 'int32_t', 'int32_t', 'int32_t', 'uint32_t', 'uint32_t', 'uint32_t', 'uint32_t', 'uint32_t', 'uint32_t', 'uint32_t', 'uint32_t', 'str']);
// CreateFontA(cHeight, cWidth, cEscapement, cOrientation, cWeight, bItalic, bUnderline, bStrikeOut, iCharSet, iOutPrecision, iClipPrecision, iQuality, iPitchAndFamily, pszFaceName)
// cHeight : INT -> 'int32_t'
// cWidth : INT -> 'int32_t'
// cEscapement : INT -> 'int32_t'
// cOrientation : INT -> 'int32_t'
// cWeight : INT -> 'int32_t'
// bItalic : DWORD -> 'uint32_t'
// bUnderline : DWORD -> 'uint32_t'
// bStrikeOut : DWORD -> 'uint32_t'
// iCharSet : DWORD -> 'uint32_t'
// iOutPrecision : DWORD -> 'uint32_t'
// iClipPrecision : DWORD -> 'uint32_t'
// iQuality : DWORD -> 'uint32_t'
// iPitchAndFamily : DWORD -> 'uint32_t'
// pszFaceName : LPCSTR optional -> 'str'
// 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("GDI32.dll", {
  CreateFontA: { parameters: ["i32", "i32", "i32", "i32", "i32", "u32", "u32", "u32", "u32", "u32", "u32", "u32", "u32", "buffer"], result: "pointer" },
});
// lib.symbols.CreateFontA(cHeight, cWidth, cEscapement, cOrientation, cWeight, bItalic, bUnderline, bStrikeOut, iCharSet, iOutPrecision, iClipPrecision, iQuality, iPitchAndFamily, pszFaceName)
// cHeight : INT -> "i32"
// cWidth : INT -> "i32"
// cEscapement : INT -> "i32"
// cOrientation : INT -> "i32"
// cWeight : INT -> "i32"
// bItalic : DWORD -> "u32"
// bUnderline : DWORD -> "u32"
// bStrikeOut : DWORD -> "u32"
// iCharSet : DWORD -> "u32"
// iOutPrecision : DWORD -> "u32"
// iClipPrecision : DWORD -> "u32"
// iQuality : DWORD -> "u32"
// iPitchAndFamily : DWORD -> "u32"
// pszFaceName : LPCSTR optional -> "buffer"
// 文字列は "buffer"。ANSI(-A) は new TextEncoder() で UTF-8/ANSI バイト列(末尾に \x00)を渡す。
// 値渡し構造体は { struct: [ ...field types... ] } を使用。

<?php
$ffi = FFI::cdef(<<<C
void* CreateFontA(
    int32_t cHeight,
    int32_t cWidth,
    int32_t cEscapement,
    int32_t cOrientation,
    int32_t cWeight,
    uint32_t bItalic,
    uint32_t bUnderline,
    uint32_t bStrikeOut,
    uint32_t iCharSet,
    uint32_t iOutPrecision,
    uint32_t iClipPrecision,
    uint32_t iQuality,
    uint32_t iPitchAndFamily,
    const char* pszFaceName);
C, "GDI32.dll");
// $ffi->CreateFontA(cHeight, cWidth, cEscapement, cOrientation, cWeight, bItalic, bUnderline, bStrikeOut, iCharSet, iOutPrecision, iClipPrecision, iQuality, iPitchAndFamily, pszFaceName);
// cHeight : INT
// cWidth : INT
// cEscapement : INT
// cOrientation : INT
// cWeight : INT
// bItalic : DWORD
// bUnderline : DWORD
// bStrikeOut : DWORD
// iCharSet : DWORD
// iOutPrecision : DWORD
// iClipPrecision : DWORD
// iQuality : DWORD
// iPitchAndFamily : DWORD
// pszFaceName : LPCSTR 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 Gdi32 extends StdCallLibrary {
    Gdi32 INSTANCE = Native.load("gdi32", Gdi32.class, W32APIOptions.ASCII_OPTIONS);
    Pointer CreateFontA(
        int cHeight,   // INT
        int cWidth,   // INT
        int cEscapement,   // INT
        int cOrientation,   // INT
        int cWeight,   // INT
        int bItalic,   // DWORD
        int bUnderline,   // DWORD
        int bStrikeOut,   // DWORD
        int iCharSet,   // DWORD
        int iOutPrecision,   // DWORD
        int iClipPrecision,   // DWORD
        int iQuality,   // DWORD
        int iPitchAndFamily,   // DWORD
        String pszFaceName   // LPCSTR optional
    );
}

@[Link("gdi32")]
lib LibGDI32
  fun CreateFontA = CreateFontA(
    cHeight : Int32,   # INT
    cWidth : Int32,   # INT
    cEscapement : Int32,   # INT
    cOrientation : Int32,   # INT
    cWeight : Int32,   # INT
    bItalic : UInt32,   # DWORD
    bUnderline : UInt32,   # DWORD
    bStrikeOut : UInt32,   # DWORD
    iCharSet : UInt32,   # DWORD
    iOutPrecision : UInt32,   # DWORD
    iClipPrecision : UInt32,   # DWORD
    iQuality : UInt32,   # DWORD
    iPitchAndFamily : UInt32,   # DWORD
    pszFaceName : UInt8*   # LPCSTR optional
  ) : Void*
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 CreateFontANative = Pointer<Void> Function(Int32, Int32, Int32, Int32, Int32, Uint32, Uint32, Uint32, Uint32, Uint32, Uint32, Uint32, Uint32, Pointer<Utf8>);
typedef CreateFontADart = Pointer<Void> Function(int, int, int, int, int, int, int, int, int, int, int, int, int, Pointer<Utf8>);
final CreateFontA = DynamicLibrary.open('GDI32.dll')
    .lookupFunction<CreateFontANative, CreateFontADart>('CreateFontA');
// cHeight : INT -> Int32
// cWidth : INT -> Int32
// cEscapement : INT -> Int32
// cOrientation : INT -> Int32
// cWeight : INT -> Int32
// bItalic : DWORD -> Uint32
// bUnderline : DWORD -> Uint32
// bStrikeOut : DWORD -> Uint32
// iCharSet : DWORD -> Uint32
// iOutPrecision : DWORD -> Uint32
// iClipPrecision : DWORD -> Uint32
// iQuality : DWORD -> Uint32
// iPitchAndFamily : DWORD -> Uint32
// pszFaceName : LPCSTR optional -> Pointer<Utf8>
// 文字列は package:ffi の "...".toNativeUtf16()/toNativeUtf8() で変換。

{$mode objfpc}{$H+}
function CreateFontA(
  cHeight: Integer;   // INT
  cWidth: Integer;   // INT
  cEscapement: Integer;   // INT
  cOrientation: Integer;   // INT
  cWeight: Integer;   // INT
  bItalic: DWORD;   // DWORD
  bUnderline: DWORD;   // DWORD
  bStrikeOut: DWORD;   // DWORD
  iCharSet: DWORD;   // DWORD
  iOutPrecision: DWORD;   // DWORD
  iClipPrecision: DWORD;   // DWORD
  iQuality: DWORD;   // DWORD
  iPitchAndFamily: DWORD;   // DWORD
  pszFaceName: PAnsiChar   // LPCSTR optional
): THandle; stdcall;
  external 'GDI32.dll' name 'CreateFontA';

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

foreign import stdcall safe "CreateFontA"
  c_CreateFontA :: Int32 -> Int32 -> Int32 -> Int32 -> Int32 -> Word32 -> Word32 -> Word32 -> Word32 -> Word32 -> Word32 -> Word32 -> Word32 -> CString -> IO (Ptr ())
-- cHeight : INT -> Int32
-- cWidth : INT -> Int32
-- cEscapement : INT -> Int32
-- cOrientation : INT -> Int32
-- cWeight : INT -> Int32
-- bItalic : DWORD -> Word32
-- bUnderline : DWORD -> Word32
-- bStrikeOut : DWORD -> Word32
-- iCharSet : DWORD -> Word32
-- iOutPrecision : DWORD -> Word32
-- iClipPrecision : DWORD -> Word32
-- iQuality : DWORD -> Word32
-- iPitchAndFamily : DWORD -> Word32
-- pszFaceName : LPCSTR optional -> CString
-- 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 createfonta =
  foreign "CreateFontA"
    (int32_t @-> int32_t @-> int32_t @-> int32_t @-> int32_t @-> uint32_t @-> uint32_t @-> uint32_t @-> uint32_t @-> uint32_t @-> uint32_t @-> uint32_t @-> uint32_t @-> string @-> returning (ptr void))
(* cHeight : INT -> int32_t *)
(* cWidth : INT -> int32_t *)
(* cEscapement : INT -> int32_t *)
(* cOrientation : INT -> int32_t *)
(* cWeight : INT -> int32_t *)
(* bItalic : DWORD -> uint32_t *)
(* bUnderline : DWORD -> uint32_t *)
(* bStrikeOut : DWORD -> uint32_t *)
(* iCharSet : DWORD -> uint32_t *)
(* iOutPrecision : DWORD -> uint32_t *)
(* iClipPrecision : DWORD -> uint32_t *)
(* iQuality : DWORD -> uint32_t *)
(* iPitchAndFamily : DWORD -> uint32_t *)
(* pszFaceName : LPCSTR optional -> string *)
(* 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 gdi32 (t "GDI32.dll"))
(cffi:use-foreign-library gdi32)

(cffi:defcfun ("CreateFontA" create-font-a :convention :stdcall) :pointer
  (c-height :int32)   ; INT
  (c-width :int32)   ; INT
  (c-escapement :int32)   ; INT
  (c-orientation :int32)   ; INT
  (c-weight :int32)   ; INT
  (b-italic :uint32)   ; DWORD
  (b-underline :uint32)   ; DWORD
  (b-strike-out :uint32)   ; DWORD
  (i-char-set :uint32)   ; DWORD
  (i-out-precision :uint32)   ; DWORD
  (i-clip-precision :uint32)   ; DWORD
  (i-quality :uint32)   ; DWORD
  (i-pitch-and-family :uint32)   ; DWORD
  (psz-face-name :string))   ; LPCSTR optional
; isize/usize(INT_PTR/SIZE_T)は x64 前提で :int64/:uint64。x86 では :int32/:uint32。

use Win32::API;
my $CreateFontA = Win32::API::More->new('GDI32',
    'HANDLE CreateFontA(int cHeight, int cWidth, int cEscapement, int cOrientation, int cWeight, DWORD bItalic, DWORD bUnderline, DWORD bStrikeOut, DWORD iCharSet, DWORD iOutPrecision, DWORD iClipPrecision, DWORD iQuality, DWORD iPitchAndFamily, LPCSTR pszFaceName)');
# my $ret = $CreateFontA->Call($cHeight, $cWidth, $cEscapement, $cOrientation, $cWeight, $bItalic, $bUnderline, $bStrikeOut, $iCharSet, $iOutPrecision, $iClipPrecision, $iQuality, $iPitchAndFamily, $pszFaceName);
# cHeight : INT -> int
# cWidth : INT -> int
# cEscapement : INT -> int
# cOrientation : INT -> int
# cWeight : INT -> int
# bItalic : DWORD -> DWORD
# bUnderline : DWORD -> DWORD
# bStrikeOut : DWORD -> DWORD
# iCharSet : DWORD -> DWORD
# iOutPrecision : DWORD -> DWORD
# iClipPrecision : DWORD -> DWORD
# iQuality : DWORD -> DWORD
# iPitchAndFamily : DWORD -> DWORD
# pszFaceName : LPCSTR optional -> LPCSTR
# 値渡し構造体は pack() した文字列、または Win32::API::Struct を使用。