GetTextExtentPointA

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

BOOL GetTextExtentPointA(
    HDC hdc,
    LPCSTR lpString,
    INT c,
    SIZE* lpsz
);

<DllImport("GDI32.dll", CharSet:=CharSet.Ansi, ExactSpelling:=True)>
Public Shared Function GetTextExtentPointA(
    hdc As IntPtr,   ' HDC
    <MarshalAs(UnmanagedType.LPStr)> lpString As String,   ' LPCSTR
    c As Integer,   ' INT
    lpsz As IntPtr   ' SIZE* out
) As Boolean
End Function

' hdc : HDC
' lpString : LPCSTR
' c : INT
' lpsz : SIZE* out
Declare PtrSafe Function GetTextExtentPointA Lib "gdi32" ( _
    ByVal hdc As LongPtr, _
    ByVal lpString As String, _
    ByVal c As Long, _
    ByVal lpsz As LongPtr) As Long
' VBA7前提(PtrSafe)。32bit Office では LongPtr→Long。Integer=16bit / Long=32bit / LongLong=64bit。

import ctypes
from ctypes import wintypes

GetTextExtentPointA = ctypes.windll.gdi32.GetTextExtentPointA
GetTextExtentPointA.restype = wintypes.BOOL
GetTextExtentPointA.argtypes = [
    wintypes.HANDLE,  # hdc : HDC
    wintypes.LPCSTR,  # lpString : LPCSTR
    ctypes.c_int,  # c : INT
    ctypes.c_void_p,  # lpsz : SIZE* out
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('GDI32.dll')
GetTextExtentPointA = Fiddle::Function.new(
  lib['GetTextExtentPointA'],
  [
    Fiddle::TYPE_VOIDP,  # hdc : HDC
    Fiddle::TYPE_VOIDP,  # lpString : LPCSTR
    Fiddle::TYPE_INT,  # c : INT
    Fiddle::TYPE_VOIDP,  # lpsz : SIZE* out
  ],
  Fiddle::TYPE_INT)

#[link(name = "gdi32")]
extern "system" {
    fn GetTextExtentPointA(
        hdc: *mut core::ffi::c_void,  // HDC
        lpString: *const u8,  // LPCSTR
        c: i32,  // INT
        lpsz: *mut SIZE  // SIZE* out
    ) -> i32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[return: MarshalAs(UnmanagedType.Bool)]
[DllImport("GDI32.dll", CharSet = CharSet.Ansi)]
public static extern bool GetTextExtentPointA(IntPtr hdc, [MarshalAs(UnmanagedType.LPStr)] string lpString, int c, IntPtr lpsz);
"@
$api = Add-Type -MemberDefinition $sig -Name 'GDI32_GetTextExtentPointA' -Namespace Win32 -PassThru
# $api::GetTextExtentPointA(hdc, lpString, c, lpsz)

#uselib "GDI32.dll"
#func global GetTextExtentPointA "GetTextExtentPointA" sptr, sptr, sptr, sptr
; GetTextExtentPointA hdc, lpString, c, varptr(lpsz)   ; 戻り値は stat
; hdc : HDC -> "sptr"
; lpString : LPCSTR -> "sptr"
; c : INT -> "sptr"
; lpsz : SIZE* 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 "GDI32.dll"
#cfunc global GetTextExtentPointA "GetTextExtentPointA" sptr, str, int, var
; res = GetTextExtentPointA(hdc, lpString, c, lpsz)
; hdc : HDC -> "sptr"
; lpString : LPCSTR -> "str"
; c : INT -> "int"
; lpsz : SIZE* 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 GetTextExtentPointA(HDC hdc, LPCSTR lpString, INT c, SIZE* lpsz)
#uselib "GDI32.dll"
#cfunc global GetTextExtentPointA "GetTextExtentPointA" intptr, str, int, var
; res = GetTextExtentPointA(hdc, lpString, c, lpsz)
; hdc : HDC -> "intptr"
; lpString : LPCSTR -> "str"
; c : INT -> "int"
; lpsz : SIZE* 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")
	procGetTextExtentPointA = gdi32.NewProc("GetTextExtentPointA")
)

// hdc (HDC), lpString (LPCSTR), c (INT), lpsz (SIZE* out)
r1, _, err := procGetTextExtentPointA.Call(
	uintptr(hdc),
	uintptr(unsafe.Pointer(windows.BytePtrFromString(lpString))),
	uintptr(c),
	uintptr(lpsz),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // BOOL

function GetTextExtentPointA(
  hdc: THandle;   // HDC
  lpString: PAnsiChar;   // LPCSTR
  c: Integer;   // INT
  lpsz: Pointer   // SIZE* out
): BOOL; stdcall;
  external 'GDI32.dll' name 'GetTextExtentPointA';

result := DllCall("GDI32\GetTextExtentPointA"
    , "Ptr", hdc   ; HDC
    , "AStr", lpString   ; LPCSTR
    , "Int", c   ; INT
    , "Ptr", lpsz   ; SIZE* out
    , "Int")   ; return: BOOL

●GetTextExtentPointA(hdc, lpString, c, lpsz) = DLL("GDI32.dll", "bool GetTextExtentPointA(void*, char*, int, void*)")
# 呼び出し: GetTextExtentPointA(hdc, lpString, c, lpsz)
# hdc : HDC -> "void*"
# lpString : LPCSTR -> "char*"
# c : INT -> "int"
# lpsz : SIZE* 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)。