WinAPI OpenProcess in Golang

open_process.go

package main

import (
	"fmt"
	"syscall"
	"unsafe"
)

type Process uintptr

const PROCESS_ALL_ACCESS = 0x1F0FFF

func main() {
	// open process
	pid := 0
	fmt.Print("Input PID: ")
	fmt.Scanf("%d", &pid)
	handle := OpenProcessHandle(pid)

	fmt.Printf("handle: %d", handle)
}

func OpenProcessHandle(processId int) Process {
	kernel32 := syscall.MustLoadDLL("kernel32.dll")
	proc := kernel32.MustFindProc("OpenProcess")
	handle, _, _ := proc.Call(ptr(PROCESS_ALL_ACCESS), ptr(true), ptr(processId))
	return Process(handle)
}

func ptr(val interface{}) uintptr {
	switch val.(type) {
	case string:
		return uintptr(unsafe.Pointer(syscall.StringToUTF16Ptr(val.(string))))
	case int:
		return uintptr(val.(int))
	default:
		return uintptr(0)
	}
}