GetCharWidthW

// GDI32.dll  (Unicode / -W)
#include <windows.h>

BOOL GetCharWidthW(
    HDC hdc,
    DWORD iFirst,
    DWORD iLast,
    INT* lpBuffer
);

<DllImport("GDI32.dll", CharSet:=CharSet.Unicode, ExactSpelling:=True)>
Public Shared Function GetCharWidthW(
    hdc As IntPtr,   ' HDC
    iFirst As UInteger,   ' DWORD
    iLast As UInteger,   ' DWORD
    <Out> ByRef lpBuffer As Integer   ' INT* out
) As Boolean
End Function

' hdc : HDC
' iFirst : DWORD
' iLast : DWORD
' lpBuffer : INT* out
Declare PtrSafe Function GetCharWidthW Lib "gdi32" ( _
    ByVal hdc As LongPtr, _
    ByVal iFirst As Long, _
    ByVal iLast As Long, _
    ByRef lpBuffer As Long) As Long
' Unicode(W): 文字列は ByVal As LongPtr とし StrPtr(unicodeStr) を渡す
' VBA7前提(PtrSafe)。32bit Office では LongPtr→Long。Integer=16bit / Long=32bit / LongLong=64bit。

import ctypes
from ctypes import wintypes

GetCharWidthW = ctypes.windll.gdi32.GetCharWidthW
GetCharWidthW.restype = wintypes.BOOL
GetCharWidthW.argtypes = [
    wintypes.HANDLE,  # hdc : HDC
    wintypes.DWORD,  # iFirst : DWORD
    wintypes.DWORD,  # iLast : DWORD
    ctypes.POINTER(ctypes.c_int),  # lpBuffer : INT* out
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('GDI32.dll')
GetCharWidthW = Fiddle::Function.new(
  lib['GetCharWidthW'],
  [
    Fiddle::TYPE_VOIDP,  # hdc : HDC
    -Fiddle::TYPE_INT,  # iFirst : DWORD
    -Fiddle::TYPE_INT,  # iLast : DWORD
    Fiddle::TYPE_VOIDP,  # lpBuffer : INT* out
  ],
  Fiddle::TYPE_INT)
# Wide strings: pass str.encode("UTF-16LE") + "\x00\x00"

#[link(name = "gdi32")]
extern "system" {
    fn GetCharWidthW(
        hdc: *mut core::ffi::c_void,  // HDC
        iFirst: u32,  // DWORD
        iLast: u32,  // DWORD
        lpBuffer: *mut i32  // INT* out
    ) -> i32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[return: MarshalAs(UnmanagedType.Bool)]
[DllImport("GDI32.dll", CharSet = CharSet.Unicode)]
public static extern bool GetCharWidthW(IntPtr hdc, uint iFirst, uint iLast, out int lpBuffer);
"@
$api = Add-Type -MemberDefinition $sig -Name 'GDI32_GetCharWidthW' -Namespace Win32 -PassThru
# $api::GetCharWidthW(hdc, iFirst, iLast, lpBuffer)

#uselib "GDI32.dll"
#func global GetCharWidthW "GetCharWidthW" wptr, wptr, wptr, wptr
; GetCharWidthW hdc, iFirst, iLast, varptr(lpBuffer)   ; 戻り値は stat
; hdc : HDC -> "wptr"
; iFirst : DWORD -> "wptr"
; iLast : DWORD -> "wptr"
; lpBuffer : INT* out -> "wptr"
; ※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 GetCharWidthW "GetCharWidthW" sptr, int, int, var
; res = GetCharWidthW(hdc, iFirst, iLast, lpBuffer)
; hdc : HDC -> "sptr"
; iFirst : DWORD -> "int"
; iLast : DWORD -> "int"
; lpBuffer : INT* 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。

; BOOL GetCharWidthW(HDC hdc, DWORD iFirst, DWORD iLast, INT* lpBuffer)
#uselib "GDI32.dll"
#cfunc global GetCharWidthW "GetCharWidthW" intptr, int, int, var
; res = GetCharWidthW(hdc, iFirst, iLast, lpBuffer)
; hdc : HDC -> "intptr"
; iFirst : DWORD -> "int"
; iLast : DWORD -> "int"
; lpBuffer : INT* 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 (
	gdi32 = windows.NewLazySystemDLL("GDI32.dll")
	procGetCharWidthW = gdi32.NewProc("GetCharWidthW")
)

// hdc (HDC), iFirst (DWORD), iLast (DWORD), lpBuffer (INT* out)
r1, _, err := procGetCharWidthW.Call(
	uintptr(hdc),
	uintptr(iFirst),
	uintptr(iLast),
	uintptr(lpBuffer),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // BOOL

function GetCharWidthW(
  hdc: THandle;   // HDC
  iFirst: DWORD;   // DWORD
  iLast: DWORD;   // DWORD
  lpBuffer: Pointer   // INT* out
): BOOL; stdcall;
  external 'GDI32.dll' name 'GetCharWidthW';

result := DllCall("GDI32\GetCharWidthW"
    , "Ptr", hdc   ; HDC
    , "UInt", iFirst   ; DWORD
    , "UInt", iLast   ; DWORD
    , "Ptr", lpBuffer   ; INT* out
    , "Int")   ; return: BOOL

●GetCharWidthW(hdc, iFirst, iLast, lpBuffer) = DLL("GDI32.dll", "bool GetCharWidthW(void*, dword, dword, void*)")
# 呼び出し: GetCharWidthW(hdc, iFirst, iLast, lpBuffer)
# hdc : HDC -> "void*"
# iFirst : DWORD -> "dword"
# iLast : DWORD -> "dword"
# lpBuffer : INT* 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)。
# ※-W(Unicode)関数。なでしこ1はANSIのため -A 版の利用を推奨。