CharNextA

// USER32.dll  (ANSI / -A)
#include <windows.h>

LPSTR CharNextA(
    LPCSTR lpsz
);

<DllImport("USER32.dll", CharSet:=CharSet.Ansi, ExactSpelling:=True)>
Public Shared Function CharNextA(
    <MarshalAs(UnmanagedType.LPStr)> lpsz As String   ' LPCSTR
) As IntPtr
End Function

' lpsz : LPCSTR
Declare PtrSafe Function CharNextA Lib "user32" ( _
    ByVal lpsz 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

CharNextA = ctypes.windll.user32.CharNextA
CharNextA.restype = wintypes.LPSTR
CharNextA.argtypes = [
    wintypes.LPCSTR,  # lpsz : LPCSTR
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('USER32.dll')
CharNextA = Fiddle::Function.new(
  lib['CharNextA'],
  [
    Fiddle::TYPE_VOIDP,  # lpsz : LPCSTR
  ],
  Fiddle::TYPE_VOIDP)

#[link(name = "user32")]
extern "system" {
    fn CharNextA(
        lpsz: *const u8  // LPCSTR
    ) -> *mut u8;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("USER32.dll", CharSet = CharSet.Ansi)]
public static extern IntPtr CharNextA([MarshalAs(UnmanagedType.LPStr)] string lpsz);
"@
$api = Add-Type -MemberDefinition $sig -Name 'USER32_CharNextA' -Namespace Win32 -PassThru
# $api::CharNextA(lpsz)

#uselib "USER32.dll"
#func global CharNextA "CharNextA" sptr
; CharNextA lpsz   ; 戻り値は stat
; lpsz : LPCSTR -> "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 "USER32.dll"
#cfunc global CharNextA "CharNextA" str
; res = CharNextA(lpsz)
; lpsz : LPCSTR -> "str"

; LPSTR CharNextA(LPCSTR lpsz)
#uselib "USER32.dll"
#cfunc global CharNextA "CharNextA" str
; res = CharNextA(lpsz)
; lpsz : LPCSTR -> "str"

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

var (
	user32 = windows.NewLazySystemDLL("USER32.dll")
	procCharNextA = user32.NewProc("CharNextA")
)

// lpsz (LPCSTR)
r1, _, err := procCharNextA.Call(
	uintptr(unsafe.Pointer(windows.BytePtrFromString(lpsz))),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // LPSTR

function CharNextA(
  lpsz: PAnsiChar   // LPCSTR
): PAnsiChar; stdcall;
  external 'USER32.dll' name 'CharNextA';

result := DllCall("USER32\CharNextA"
    , "AStr", lpsz   ; LPCSTR
    , "Ptr")   ; return: LPSTR

●CharNextA(lpsz) = DLL("USER32.dll", "char* CharNextA(char*)")
# 呼び出し: CharNextA(lpsz)
# lpsz : LPCSTR -> "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)。