WriteProcessMemory

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

BOOL WriteProcessMemory(
    HANDLE hProcess,
    void* lpBaseAddress,
    const void* lpBuffer,
    UINT_PTR nSize,
    UINT_PTR* lpNumberOfBytesWritten   // optional
);

<DllImport("KERNEL32.dll", SetLastError:=True, ExactSpelling:=True)>
Public Shared Function WriteProcessMemory(
    hProcess As IntPtr,   ' HANDLE
    lpBaseAddress As IntPtr,   ' void*
    lpBuffer As IntPtr,   ' void*
    nSize As UIntPtr,   ' UINT_PTR
    lpNumberOfBytesWritten As IntPtr   ' UINT_PTR* optional, out
) As Boolean
End Function

' hProcess : HANDLE
' lpBaseAddress : void*
' lpBuffer : void*
' nSize : UINT_PTR
' lpNumberOfBytesWritten : UINT_PTR* optional, out
Declare PtrSafe Function WriteProcessMemory Lib "kernel32" ( _
    ByVal hProcess As LongPtr, _
    ByVal lpBaseAddress As LongPtr, _
    ByVal lpBuffer As LongPtr, _
    ByVal nSize As LongPtr, _
    ByVal lpNumberOfBytesWritten 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

WriteProcessMemory = ctypes.windll.kernel32.WriteProcessMemory
WriteProcessMemory.restype = wintypes.BOOL
WriteProcessMemory.argtypes = [
    wintypes.HANDLE,  # hProcess : HANDLE
    ctypes.POINTER(None),  # lpBaseAddress : void*
    ctypes.POINTER(None),  # lpBuffer : void*
    ctypes.c_size_t,  # nSize : UINT_PTR
    ctypes.POINTER(ctypes.c_size_t),  # lpNumberOfBytesWritten : UINT_PTR* optional, out
]
# GetLastError: use ctypes.GetLastError() (or ctypes.WinDLL(use_last_error=True))

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('KERNEL32.dll')
WriteProcessMemory = Fiddle::Function.new(
  lib['WriteProcessMemory'],
  [
    Fiddle::TYPE_VOIDP,  # hProcess : HANDLE
    Fiddle::TYPE_VOIDP,  # lpBaseAddress : void*
    Fiddle::TYPE_VOIDP,  # lpBuffer : void*
    Fiddle::TYPE_UINTPTR_T,  # nSize : UINT_PTR
    Fiddle::TYPE_VOIDP,  # lpNumberOfBytesWritten : UINT_PTR* optional, out
  ],
  Fiddle::TYPE_INT)

#[link(name = "kernel32")]
extern "system" {
    fn WriteProcessMemory(
        hProcess: *mut core::ffi::c_void,  // HANDLE
        lpBaseAddress: *mut (),  // void*
        lpBuffer: *const (),  // void*
        nSize: usize,  // UINT_PTR
        lpNumberOfBytesWritten: *mut usize  // UINT_PTR* optional, out
    ) -> 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 WriteProcessMemory(IntPtr hProcess, IntPtr lpBaseAddress, IntPtr lpBuffer, UIntPtr nSize, IntPtr lpNumberOfBytesWritten);
"@
$api = Add-Type -MemberDefinition $sig -Name 'KERNEL32_WriteProcessMemory' -Namespace Win32 -PassThru
# $api::WriteProcessMemory(hProcess, lpBaseAddress, lpBuffer, nSize, lpNumberOfBytesWritten)

#uselib "KERNEL32.dll"
#func global WriteProcessMemory "WriteProcessMemory" sptr, sptr, sptr, sptr, sptr
; WriteProcessMemory hProcess, lpBaseAddress, lpBuffer, nSize, varptr(lpNumberOfBytesWritten)   ; 戻り値は stat
; hProcess : HANDLE -> "sptr"
; lpBaseAddress : void* -> "sptr"
; lpBuffer : void* -> "sptr"
; nSize : UINT_PTR -> "sptr"
; lpNumberOfBytesWritten : UINT_PTR* optional, 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 "KERNEL32.dll"
#cfunc global WriteProcessMemory "WriteProcessMemory" sptr, sptr, sptr, sptr, var
; res = WriteProcessMemory(hProcess, lpBaseAddress, lpBuffer, nSize, lpNumberOfBytesWritten)
; hProcess : HANDLE -> "sptr"
; lpBaseAddress : void* -> "sptr"
; lpBuffer : void* -> "sptr"
; nSize : UINT_PTR -> "sptr"
; lpNumberOfBytesWritten : UINT_PTR* optional, 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 WriteProcessMemory(HANDLE hProcess, void* lpBaseAddress, void* lpBuffer, UINT_PTR nSize, UINT_PTR* lpNumberOfBytesWritten)
#uselib "KERNEL32.dll"
#cfunc global WriteProcessMemory "WriteProcessMemory" intptr, intptr, intptr, intptr, var
; res = WriteProcessMemory(hProcess, lpBaseAddress, lpBuffer, nSize, lpNumberOfBytesWritten)
; hProcess : HANDLE -> "intptr"
; lpBaseAddress : void* -> "intptr"
; lpBuffer : void* -> "intptr"
; nSize : UINT_PTR -> "intptr"
; lpNumberOfBytesWritten : UINT_PTR* optional, 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 (
	kernel32 = windows.NewLazySystemDLL("KERNEL32.dll")
	procWriteProcessMemory = kernel32.NewProc("WriteProcessMemory")
)

// hProcess (HANDLE), lpBaseAddress (void*), lpBuffer (void*), nSize (UINT_PTR), lpNumberOfBytesWritten (UINT_PTR* optional, out)
r1, _, err := procWriteProcessMemory.Call(
	uintptr(hProcess),
	uintptr(lpBaseAddress),
	uintptr(lpBuffer),
	uintptr(nSize),
	uintptr(lpNumberOfBytesWritten),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // BOOL

function WriteProcessMemory(
  hProcess: THandle;   // HANDLE
  lpBaseAddress: Pointer;   // void*
  lpBuffer: Pointer;   // void*
  nSize: NativeUInt;   // UINT_PTR
  lpNumberOfBytesWritten: Pointer   // UINT_PTR* optional, out
): BOOL; stdcall;
  external 'KERNEL32.dll' name 'WriteProcessMemory';

result := DllCall("KERNEL32\WriteProcessMemory"
    , "Ptr", hProcess   ; HANDLE
    , "Ptr", lpBaseAddress   ; void*
    , "Ptr", lpBuffer   ; void*
    , "UPtr", nSize   ; UINT_PTR
    , "Ptr", lpNumberOfBytesWritten   ; UINT_PTR* optional, out
    , "Int")   ; return: BOOL

●WriteProcessMemory(hProcess, lpBaseAddress, lpBuffer, nSize, lpNumberOfBytesWritten) = DLL("KERNEL32.dll", "bool WriteProcessMemory(void*, void*, void*, int, void*)")
# 呼び出し: WriteProcessMemory(hProcess, lpBaseAddress, lpBuffer, nSize, lpNumberOfBytesWritten)
# hProcess : HANDLE -> "void*"
# lpBaseAddress : void* -> "void*"
# lpBuffer : void* -> "void*"
# nSize : UINT_PTR -> "int"
# lpNumberOfBytesWritten : UINT_PTR* optional, 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)。