getprocessid.go

// simple example on using win32 api from golang 

package main

import (
	"errors"
	"fmt"
	"log"
	"unsafe"

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

func GetProcessIdFromName(n string) (uint32, error) {

	handle, err := win.CreateToolhelp32Snapshot(win.TH32CS_SNAPPROCESS, 0)

	if err != nil {
		return 0, err
	}

	procEntry := win.ProcessEntry32{}

	procEntry.Size = uint32(unsafe.Sizeof(procEntry))

	err = win.Process32First(handle, &procEntry)

	if err != nil {
		return 0, err
	}

	for win.Process32Next(handle, &procEntry) == nil {

		exeFile := win.UTF16ToString(procEntry.ExeFile[:])

		if exeFile == n {
			return procEntry.ProcessID, nil
		}
	}

	return 0, errors.New("process not found")
}

func main() {

	id, err := GetProcessIdFromName("brave.exe")

	if err != nil {
		log.Fatal(err)
	}

	fmt.Println("brave processId: ", id)
}