TransmitCommChar

// KERNEL32.dll
#include <windows.h>

BOOL TransmitCommChar(
    HANDLE hFile,
    CHAR cChar
);

<DllImport("KERNEL32.dll", SetLastError:=True, ExactSpelling:=True)>
Public Shared Function TransmitCommChar(
    hFile As IntPtr,   ' HANDLE
    cChar As SByte   ' CHAR
) As Boolean
End Function

' hFile : HANDLE
' cChar : CHAR
Declare PtrSafe Function TransmitCommChar Lib "kernel32" ( _
    ByVal hFile As LongPtr, _
    ByVal cChar As Byte) As Long
' VBA7前提(PtrSafe)。32bit Office では LongPtr→Long。Integer=16bit / Long=32bit / LongLong=64bit。

import ctypes
from ctypes import wintypes

TransmitCommChar = ctypes.windll.kernel32.TransmitCommChar
TransmitCommChar.restype = wintypes.BOOL
TransmitCommChar.argtypes = [
    wintypes.HANDLE,  # hFile : HANDLE
    ctypes.c_byte,  # cChar : CHAR
]
# GetLastError: use ctypes.GetLastError() (or ctypes.WinDLL(use_last_error=True))

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('KERNEL32.dll')
TransmitCommChar = Fiddle::Function.new(
  lib['TransmitCommChar'],
  [
    Fiddle::TYPE_VOIDP,  # hFile : HANDLE
    Fiddle::TYPE_CHAR,  # cChar : CHAR
  ],
  Fiddle::TYPE_INT)

#[link(name = "kernel32")]
extern "system" {
    fn TransmitCommChar(
        hFile: *mut core::ffi::c_void,  // HANDLE
        cChar: i8  // CHAR
    ) -> i32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[return: MarshalAs(UnmanagedType.Bool)]
[DllImport("KERNEL32.dll", SetLastError = true)]
public static extern bool TransmitCommChar(IntPtr hFile, sbyte cChar);
"@
$api = Add-Type -MemberDefinition $sig -Name 'KERNEL32_TransmitCommChar' -Namespace Win32 -PassThru
# $api::TransmitCommChar(hFile, cChar)

#uselib "KERNEL32.dll"
#func global TransmitCommChar "TransmitCommChar" sptr, sptr
; TransmitCommChar hFile, cChar   ; 戻り値は stat
; hFile : HANDLE -> "sptr"
; cChar : CHAR -> "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 "KERNEL32.dll"
#cfunc global TransmitCommChar "TransmitCommChar" sptr, int
; res = TransmitCommChar(hFile, cChar)
; hFile : HANDLE -> "sptr"
; cChar : CHAR -> "int"

; BOOL TransmitCommChar(HANDLE hFile, CHAR cChar)
#uselib "KERNEL32.dll"
#cfunc global TransmitCommChar "TransmitCommChar" intptr, int
; res = TransmitCommChar(hFile, cChar)
; hFile : HANDLE -> "intptr"
; cChar : CHAR -> "int"

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

var (
	kernel32 = windows.NewLazySystemDLL("KERNEL32.dll")
	procTransmitCommChar = kernel32.NewProc("TransmitCommChar")
)

// hFile (HANDLE), cChar (CHAR)
r1, _, err := procTransmitCommChar.Call(
	uintptr(hFile),
	uintptr(cChar),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // BOOL

function TransmitCommChar(
  hFile: THandle;   // HANDLE
  cChar: Shortint   // CHAR
): BOOL; stdcall;
  external 'KERNEL32.dll' name 'TransmitCommChar';

result := DllCall("KERNEL32\TransmitCommChar"
    , "Ptr", hFile   ; HANDLE
    , "Char", cChar   ; CHAR
    , "Int")   ; return: BOOL

●TransmitCommChar(hFile, cChar) = DLL("KERNEL32.dll", "bool TransmitCommChar(void*, char)")
# 呼び出し: TransmitCommChar(hFile, cChar)
# hFile : HANDLE -> "void*"
# cChar : CHAR -> "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)。