get_windows_pid_by_processname.go

package main

import (
	"log"
	"syscall"
	"unsafe"

	"golang.org/x/sys/windows"
)

func getPidByName(processName string) uint32 {
	hSnapshot, err := windows.CreateToolhelp32Snapshot(windows.TH32CS_SNAPPROCESS, 0)
	if err != nil {
		panic(err)
	}
	defer windows.CloseHandle(hSnapshot)

	var entry windows.ProcessEntry32
	entry.Size = uint32(unsafe.Sizeof(entry))
	if err := windows.Process32First(hSnapshot, &entry); err != nil {
		panic(err)
	}

	for {
		if syscall.UTF16ToString(entry.ExeFile[:]) == processName {
			return entry.ProcessID
		}

		if err := windows.Process32Next(hSnapshot, &entry); err != nil {
			break
		}
	}
	return 0
}

func main() {
	log.Println(getPidByName("explorer.exe"))
}