[RESOLVED] Pause Process Execution

[weirddemon]

I've seen some third party applications pause the execution of a process and then enable that process later.

As far as I can tell, there is no managed way to do this, so I've been looking at unmanaged ways via an API. I couldn't find any specific information on it, but I figured there must be something.

Does anyone know a method to complete my task or an API I could research?

Any information is appreciated.

Thanks

[dee-u]

Perhaps you are looking for SuspendThread and ResumeThread APIs? The following is VB6.

Private Declare Function ResumeThread Lib "kernel32.dll" ( _
                ByVal hThread As Long) As Long
Private Declare Function SuspendThread Lib "kernel32.dll" ( _
                ByVal hThread As Long) As Long

[Hack]

Moved To API Section

[weirddemon]

Perhaps you are looking for SuspendThread and ResumeThread APIs? The following is VB6.

Private Declare Function ResumeThread Lib "kernel32.dll" ( _
                ByVal hThread As Long) As Long
Private Declare Function SuspendThread Lib "kernel32.dll" ( _
                ByVal hThread As Long) As Long

Thanks. I'll look into them

[agent_007]

u can use sleep api
The Sleep function suspends the execution of the current thread for a specified interval.

Declare Sub Sleep Lib "kernel32" Alias "Sleep" (ByVal dwMilliseconds As Long)
sleep 5000 ' sleep for 5 secs

[weirddemon]

u can use sleep api
The Sleep function suspends the execution of the current thread for a specified interval.

Declare Sub Sleep Lib "kernel32" Alias "Sleep" (ByVal dwMilliseconds As Long)
sleep 5000 ' sleep for 5 secs

I don't want to pause the process for a set amount of time. I want it to be paused until the User decides to resume it.

I've been looking into the first two functions mentioned and it seems I need to get the Thread handle of the process and pass it as an argument to the function. The problem with that, is that I can't seem to figure out how to get the thread handle :P

I passed the Process Handle to the function, but that didn't work. So, I'm still working on finding the thread handle.

[weirddemon]

So I looked around Google a bit more and found a post in C#:

http://stackoverflow.com/questions/7...d-process-in-c

That code apparently worked for them, but I can't seem to get it to work for me. I translated the code and I would appreciate any help into figuring it out.

APIs and Flags:

Declare Function SuspendThread Lib "kernel32.dll" (ByVal hThread As IntPtr) As UInteger
    Declare Function ResumeThread Lib "kernel32.dll" (ByVal hThread As IntPtr) As UInteger
 
    Public Enum ThreadAccess As Integer
        TERMINATE = 1
        SUSPEND_RESUME = 2
        GET_CONTEXT = 8
        SET_CONTEXT = 16
        SET_INFORMATION = 32
        QUERY_INFORMATION = 64
        SET_THREAD_TOKEN = 128
        IMPERSONATE = 256
        DIRECT_IMPERSONATION = 512
    End Enum
 
Declare Function OpenThread Lib "kernel32.dll" (ByVal dwDesiredAccess As ThreadAccess, ByVal bInheritHandle As Boolean, ByVal dwThreadId As UInteger) As IntPtr

Suspend Thread Code:

Dim pid As Integer = Int32.Parse(lvwProcess.SelectedItems(0).SubItems(1).Text)
        Dim p As Process = Process.GetProcessById(pid)
 
If lvwProcess.SelectedItems.Count = 0 Then
     Else
 
         If (p.ProcessName = String.Empty) Then
         Else
            For Each pThread As ProcessThread In p.Threads
                    Dim pOpenThread As IntPtr = OpenThread(ThreadAccess.SUSPEND_RESUME, False, CType(p.Id, UInteger))
                    If (pOpenThread = IntPtr.Zero) Then
                        Exit For
                    End If
                    SuspendThread(pOpenThread)
             Next
        End If
End If

[weirddemon]

It turns out I was passing the ID of the process to the API and not the ID of the thread. I have it fixed, though.

Thanks again