GetTextCharset

// GDI32.dll
#include <windows.h>

INT GetTextCharset(
    HDC hdc
);

<DllImport("GDI32.dll", ExactSpelling:=True)>
Public Shared Function GetTextCharset(
    hdc As IntPtr   ' HDC
) As Integer
End Function

' hdc : HDC
Declare PtrSafe Function GetTextCharset Lib "gdi32" ( _
    ByVal hdc 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

GetTextCharset = ctypes.windll.gdi32.GetTextCharset
GetTextCharset.restype = ctypes.c_int
GetTextCharset.argtypes = [
    wintypes.HANDLE,  # hdc : HDC
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('GDI32.dll')
GetTextCharset = Fiddle::Function.new(
  lib['GetTextCharset'],
  [
    Fiddle::TYPE_VOIDP,  # hdc : HDC
  ],
  Fiddle::TYPE_INT)

#[link(name = "gdi32")]
extern "system" {
    fn GetTextCharset(
        hdc: *mut core::ffi::c_void  // HDC
    ) -> i32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("GDI32.dll")]
public static extern int GetTextCharset(IntPtr hdc);
"@
$api = Add-Type -MemberDefinition $sig -Name 'GDI32_GetTextCharset' -Namespace Win32 -PassThru
# $api::GetTextCharset(hdc)

#uselib "GDI32.dll"
#func global GetTextCharset "GetTextCharset" sptr
; GetTextCharset hdc   ; 戻り値は stat
; hdc : HDC -> "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 GetTextCharset "GetTextCharset" sptr
; res = GetTextCharset(hdc)
; hdc : HDC -> "sptr"

; INT GetTextCharset(HDC hdc)
#uselib "GDI32.dll"
#cfunc global GetTextCharset "GetTextCharset" intptr
; res = GetTextCharset(hdc)
; hdc : HDC -> "intptr"

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

var (
	gdi32 = windows.NewLazySystemDLL("GDI32.dll")
	procGetTextCharset = gdi32.NewProc("GetTextCharset")
)

// hdc (HDC)
r1, _, err := procGetTextCharset.Call(
	uintptr(hdc),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // INT

function GetTextCharset(
  hdc: THandle   // HDC
): Integer; stdcall;
  external 'GDI32.dll' name 'GetTextCharset';

result := DllCall("GDI32\GetTextCharset"
    , "Ptr", hdc   ; HDC
    , "Int")   ; return: INT

●GetTextCharset(hdc) = DLL("GDI32.dll", "int GetTextCharset(void*)")
# 呼び出し: GetTextCharset(hdc)
# hdc : HDC -> "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)。