Отслеживание закрытия внешней программы запущенной из моего проекта - VB

Const STILL_ACTIVE = 259
Const NORMAL_PRIORITY_CLASS = &H20
 
Private Type SECURITY_ATTRIBUTES
  nLength As Long
  lpSecurityDescriptor As Long
  bInheritHandle As Long
End Type
Private Type PROCESS_INFORMATION
  hProcess As Long
  hThread As Long
  dwProcessId As Long
  dwThreadId As Long
End Type
Private Type STARTUPINFO
  cb As Long
  lpReserved As String
  lpDesktop As String
  lpTitle As String
  dwX As Long
  dwY As Long
  dwXSize As Long
  dwYSize As Long
  dwXCountChars As Long
  dwYCountChars As Long
  dwFillAttribute As Long
  dwFlags As Long
  wShowWindow As Integer
  cbReserved2 As Integer
  lpReserved2 As Long
  hStdInput As Long
  hStdOutput As Long
  hStdError As Long
End Type
 
Private Declare Function CreateProcess Lib 'kernel32' Alias 'CreateProcessA' (ByVal lpApplicationName As String, ByVal lpCommandLine As String, lpProcessAttributes As SECURITY_ATTRIBUTES, lpThreadAttributes As SECURITY_ATTRIBUTES, ByVal bInheritHandles As Long, ByVal dwCreationFlags As Long, lpEnvironment As Any, ByVal lpCurrentDriectory As String, lpStartupInfo As STARTUPINFO, lpProcessInformation As PROCESS_INFORMATION) As Long
Private Declare Function GetExitCodeProcess Lib 'kernel32' (ByVal hProcess As Long, lpExitCode As Long) As Long
 
Private Sub Form_Load()
  Dim info As PROCESS_INFORMATION
  Dim code As Long, si As STARTUPINFO, sa As SECURITY_ATTRIBUTES
  sa.nLength = Len(sa)
  si.cb = Len(si)
  code = CreateProcess('D:WINNTSYSTEM32calc.exe', vbNullString, sa, sa, 0, NORMAL_PRIORITY_CLASS, vbNullString, vbNullString, si, info)
  If info.hProcess <> 0 Then
    code = STILL_ACTIVE
    Do While code = STILL_ACTIVE
      GetExitCodeProcess info.hProcess, code
    Loop
  End If
End Sub