How golang get process id by process name?

Question

I want to get the process identifier by the name of the process in Windows?

I see that golang has only api os.FindProcess(id) , but not by name.

Answer 1

You can list all the processes and match them with the name you want to find, using the updated sys call package, https://godoc.org/golang.org/x/sys , it has most api windows.

 func Process32First(snapshot Handle, procEntry *ProcessEntry32) (err error) func Process32Next(snapshot Handle, procEntry *ProcessEntry32) (err error) 

also see msdn docs: https://msdn.microsoft.com/en-us/library/windows/desktop/ms684834(v=vs.85).aspx

Answer 2

I also had to struggle with this, and finding a way to a solution is not very simple, because ... WinApi :)

In the end, you should create a snapshot of the current list of Windows processes using CreateToolhelp32Snapshot . Then you get the first process in the snapshot with Process32First . After that, continue to Process32Next over the list with Process32Next until you get the error ERROR_NO_MORE_FILES . Only then do you have an entire list of processes.

See how2readwindowsprocesses for a working example.

Here is the gist:

 const TH32CS_SNAPPROCESS = 0x00000002 type WindowsProcess struct { ProcessID int ParentProcessID int Exe string } func processes() ([]WindowsProcess, error) { handle, err := windows.CreateToolhelp32Snapshot(TH32CS_SNAPPROCESS, 0) if err != nil { return nil, err } defer windows.CloseHandle(handle) var entry windows.ProcessEntry32 entry.Size = uint32(unsafe.Sizeof(entry)) // get the first process err = windows.Process32First(handle, &entry) if err != nil { return nil, err } results := make([]WindowsProcess, 0, 50) for { results = append(results, newWindowsProcess(&entry)) err = windows.Process32Next(handle, &entry) if err != nil { // windows sends ERROR_NO_MORE_FILES on last process if err == syscall.ERROR_NO_MORE_FILES { return results, nil } return nil, err } } } func findProcessByName(processes []WindowsProcess, name string) *WindowsProcess { for _, p := range processes { if strings.ToLower(p.Exe) == strings.ToLower(name) { return &p } } return nil } func newWindowsProcess(e *windows.ProcessEntry32) WindowsProcess { // Find when the string ends for decoding end := 0 for { if e.ExeFile[end] == 0 { break } end++ } return WindowsProcess{ ProcessID: int(e.ProcessID), ParentProcessID: int(e.ParentProcessID), Exe: syscall.UTF16ToString(e.ExeFile[:end]), } } 

Answer 3

 const TH32CS_SNAPPROCESS = 0x00000002 type WindowsProcess struct { ProcessID int ParentProcessID int Exe string } func newWindowsProcess(e *syscall.ProcessEntry32) WindowsProcess { // Find when the string ends for decoding end := 0 for { if e.ExeFile[end] == 0 { break } end++ } return WindowsProcess{ ProcessID: int(e.ProcessID), ParentProcessID: int(e.ParentProcessID), Exe: syscall.UTF16ToString(e.ExeFile[:end]), } } func processes() ([]WindowsProcess, error) { handle, err := syscall.CreateToolhelp32Snapshot(TH32CS_SNAPPROCESS, 0) if err != nil { return nil, err } defer syscall.CloseHandle(handle) var entry syscall.ProcessEntry32 entry.Size = uint32(unsafe.Sizeof(entry)) // get the first process err = syscall.Process32First(handle, &entry) if err != nil { return nil, err } results := make([]WindowsProcess, 0, 50) for { results = append(results, newWindowsProcess(&entry)) err = syscall.Process32Next(handle, &entry) if err != nil { // windows sends ERROR_NO_MORE_FILES on last process if err == syscall.ERROR_NO_MORE_FILES { return results, nil } return nil, err } } } func findProcessByName(processes []WindowsProcess, name string) *WindowsProcess { for _, p := range processes { if bytes.Contains([]byte(strings.ToUpper(p.Exe)), []byte(strings.ToUpper(name))) { return &p } } return nil }