Esempio di ciclo per verificare l’esistenza di un processo e killarlo:

    Dim cnt As Integer 'tentativi.
    cnt = 10
    Do While IsProcessRunning("nomeprocesso.exe") = True
        
        If cnt = 0 Then
             Exit Do
        End If
        
        KillProcess ("nomeprocesso.exe")
        cnt = cnt - 1
        Sleep (2000)
    Loop

Verificare l’esistenza di un processo:

Option Explicit

Private Declare Function OpenProcess Lib "kernel32" ( _
ByVal dwDesiredAccess As Long, ByVal bInheritHandle As Long, ByVal dwProcessId As Long) As Long

Private Declare Function CloseHandle Lib "kernel32" ( _
ByVal hObject As Long) As Long

Private Declare Function EnumProcesses Lib "PSAPI.DLL" ( _
lpidProcess As Long, ByVal cb As Long, cbNeeded As Long) As Long

Private Declare Function EnumProcessModules Lib "PSAPI.DLL" ( _
ByVal hProcess As Long, lphModule As Long, ByVal cb As Long, lpcbNeeded As Long) As Long

Private Declare Function GetModuleBaseName Lib "PSAPI.DLL" Alias "GetModuleBaseNameA" ( _
ByVal hProcess As Long, ByVal hModule As Long, ByVal lpFileName As String, ByVal nSize As Long) As Long

Private Const PROCESS_VM_READ = &H10

Private Const PROCESS_QUERY_INFORMATION = &H400


Public Function IsProcessRunning(ByVal sProcess As String) As Boolean
    Const MAX_PATH As Long = 260
    Dim lProcesses() As Long, lModules() As Long, N As Long, lRet As Long, hProcess As Long
    Dim sName As String
    sProcess = UCase$(sProcess)
    ReDim lProcesses(1023) As Long
    If EnumProcesses(lProcesses(0), 1024 * 4, lRet) Then
        For N = 0 To (lRet \ 4) - 1
            hProcess = OpenProcess(PROCESS_QUERY_INFORMATION Or PROCESS_VM_READ, 0, lProcesses(N))
            If hProcess Then
                ReDim lModules(1023)
                If EnumProcessModules(hProcess, lModules(0), 1024 * 4, lRet) Then
                    sName = String$(MAX_PATH, vbNullChar)
                    GetModuleBaseName hProcess, lModules(0), sName, MAX_PATH
                    sName = Left$(sName, InStr(sName, vbNullChar) - 1)
                    If Len(sName) = Len(sProcess) Then
                        If sProcess = UCase$(sName) Then IsProcessRunning = True: Exit Function
                    End If
                End If
            End If
            CloseHandle hProcess
        Next N
    End If
End Function

Killare un processo:

Public Type PROCESSENTRY32
    dwSize As Long
    cntUsage As Long
    th32ProcessID As Long
    th32DefaultHeapID As Long
    th32ModuleID As Long
    cntThreads As Long
    th32ParentProcessID As Long
    pcPriClassBase As Long
    dwFlags As Long
    szexeFile As String * 260
End Type

Declare Function OpenProcess Lib "kernel32.dll" (ByVal dwDesiredAccess As Long, _
ByVal blnheritHandle As Long, ByVal dwAppProcessId As Long) As Long

Declare Function ProcessFirst Lib "kernel32.dll" Alias "Process32First" (ByVal hSnapshot As Long, _
uProcess As PROCESSENTRY32) As Long

Declare Function ProcessNext Lib "kernel32.dll" Alias "Process32Next" (ByVal hSnapshot As Long, _
uProcess As PROCESSENTRY32) As Long

Declare Function CreateToolhelpSnapshot Lib "kernel32.dll" Alias "CreateToolhelp32Snapshot" ( _
ByVal lFlags As Long, lProcessID As Long) As Long

Declare Function TerminateProcess Lib "kernel32.dll" (ByVal ApphProcess As Long, _
ByVal uExitCode As Long) As Long

Declare Function CloseHandle Lib "kernel32.dll" (ByVal hObject As Long) As Long

Public Sub KillProcess(NameProcess As String)
    Const PROCESS_ALL_ACCESS = &H1F0FFF
    Const TH32CS_SNAPPROCESS As Long = 2&
    Dim uProcess  As PROCESSENTRY32
    Dim RProcessFound As Long
    Dim hSnapshot As Long
    Dim SzExename As String
    Dim ExitCode As Long
    Dim MyProcess As Long
    Dim AppKill As Boolean
    Dim AppCount As Integer
    Dim i As Integer
    Dim WinDirEnv As String

       If NameProcess <> "" Then
          AppCount = 0

          uProcess.dwSize = Len(uProcess)
          hSnapshot = CreateToolhelpSnapshot(TH32CS_SNAPPROCESS, 0&)
          RProcessFound = ProcessFirst(hSnapshot, uProcess)

          Do
            i = InStr(1, uProcess.szexeFile, Chr(0))
            SzExename = LCase$(Left$(uProcess.szexeFile, i - 1))
            WinDirEnv = Environ("Windir") + "\"
            WinDirEnv = LCase$(WinDirEnv)

            If Right$(SzExename, Len(NameProcess)) = LCase$(NameProcess) Then
               AppCount = AppCount + 1
               MyProcess = OpenProcess(PROCESS_ALL_ACCESS, False, uProcess.th32ProcessID)
               AppKill = TerminateProcess(MyProcess, ExitCode)
               Call CloseHandle(MyProcess)
            End If
            RProcessFound = ProcessNext(hSnapshot, uProcess)
          Loop While RProcessFound
          Call CloseHandle(hSnapshot)
       End If

End Sub