Creating Threads in a Client EXE in Java

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Creating Threads in a Client EXE
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Running code on a thread is not the same as actually creating a new thread The amount of work required to make it possible to run VB code on a thread consists of a single setting in the Project| Properties dialog If you specify a Threading Model of Apartment Threaded for a DLL, the ThreadingModel value is set to Apartment for the CLSID\{}\lnprocServer32 key of every object in your project COM then knows the DLL supports multiple STAs For an EXE server, the Thread per Object and Thread Pool settings determines whether VB creates a new thread when it receives an external request for a new object
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The question of the hour is: How do you force VB to create an object for you on a new thread in the same process The answer: Request a new object from your own server the same way an external process would request it An internal request always creates an object on the same thread To support external object creation, you must first create an ActiveX EXE project Standard EXEs don't expose public objects, so external requests aren't possible To guarantee that the external request creates a new thread, you must select the Thread per Object project property VB always creates an internal instance if you use the New keyword to create an object in your project For obvious performance reasons, the normal COM creation mechanism is bypassed in this case, even for public classes However, if you use the CreateObject keyword instead of New, then VB defers to the CoCreateInstance API call, which then calls back to VB With CreateObject, VB can't distinguish between a request that comes from outside the ActiveX EXE and a request that comes from within The object is always created as if the request were external Refer to 7 for alternate external object creation techniques that don't force you to use a ProgID The initial steps for creating a standalone multithreaded application in VB are: 1 Create a new ActiveX EXE project 2 Set the threading option to Thread Per Object 3 Use CreateObject to create an instance of a MultiUse class when you need a new worker thread Several steps remain after you get this initial framework in place You'll want to show a user interface in your client application and enable communication between the UI on the main thread and any worker threads you create Because an ActiveX EXE can't have a startup form, you must set the startup option to Sub Main and explicitly create a form in that procedure You can create the UI object directly or create another object (clsMain) that creates UI for you The problem inherent in this approach is that Sub Main is called for every new thread, so using CreateObject to create a worker runs Sub Main a second time You want to launch the application's UI only the first time it runs
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You might first try to handle this situation by simply setting a global flag that indicates whether you're on the first thread The problem, of course, is that all the global variables are per thread, so the flag in the first thread isn't visible from the second VB's App object is no help here, so you're left with using API calls to determine the first thread The easiest and lightest mechanism I've found is to simply add an atom based on the ApphInstance value Think of the OSprovided atom table as a valueless, keyed collection All you can do is add or remove a string and check if it's already there Fortunately, that is all you need to do in this case
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'ThreadCheck class 'Instancing = Private Private Declare Function FindAtom Lib "kernel32" _ Alias "FindAtomA" (ByVal AtomName As String) As Integer Private Declare Function AddAtom Lib "kernel32" _ Alias "AddAtomA" (ByVal AtomName As String) As Integer Private Declare Function DeleteAtom Lib "kernel32" _ (ByVal Atom As Integer) As Integer Private m_Atom As Integer Private Sub Class_Initialize() Dim strAtom As String strAtom = AtomString If FindAtom(strAtom) = 0 Then m_Atom = AddAtom(strAtom) Else 'In order to clear this setting and allow you to debug, 'run DeleteAtom (FindAtom (strAtom)) in the immediate window 'until it returns 0, then set the next statement to the 'If line above DebugAssert False End If End Sub Private Function AtomString() As String AtomString = "ThreadCheck" & CStr (ApphInstance) End Function Private Sub Class_Terminate() If m_Atom Then DeleteAtom m_Atom End Sub Public Property Get First() As Boolean
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