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I am facing a problem while joining a STA thread to MTA thread. Actually the requirement was some thing like describe below.
1. I have a exe which is using some dialog boxes.
2. These dialog boxes are using MSFlexGrid. This component is a Com component.
3.so in order to run it with Vb.Net exe i had to run this dialog box in a STA thread.
4. to achive this i created a new thread and set the Apartment status STA.
5.it was working fine when i run the code. but if click on exe than at the time of join it throws an unhandled exception.if i click on continue button of exception dialog box it runs successfully. how ever i can not ignore this exception.
6. exception contains below text (i know its a bog message but i am stuck here for last couple of days.).
************** Exception Text **************
System.AccessViolationException: Attempted to read or write protected memory. This is often an indication that other memory is corrupt.
at MSFlexGridLib.IMSFlexGrid.get_Text()
at AxMSFlexGridLib.AxMSFlexGrid.get_Text()
at System.Windows.Forms.Control.OnHandleDestroyed(Eve ntArgs e)
at System.Windows.Forms.AxHost.DetachWindow()
at System.Windows.Forms.AxHost.DetachAndForward(Messa ge& m)
at System.Windows.Forms.AxHost.WndProc(Message& m)
at System.Windows.Forms.Control.ControlNativeWindow.O nMessage(Message& m)
at System.Windows.Forms.Control.ControlNativeWindow.W ndProc(Message& m)
at System.Windows.Forms.NativeWindow.Callback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)
7. COde snippet is like below.
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- ]
- Dim paramtThread As New Threading.ParameterizedThreadStart(AddressOf DelgInvoke)
- Dim exeThread As New Threading.Thread(paramtThread)
- exeThread.SetApartmentState(Threading.ApartmentState.STA)
- exeThread.Start(mbrs)// mbrs is a structure variable.
- exeThread.Join()
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- Private Function DelgInvoke(ByVal mbrs2 As Members) As Boolean
- m_bResFromExeThread = False
- m_bResFromExeThread = mbrs2.oJobTask.Execute(mbrs2.oPrinterStatus, mbrs2.nError, mbrs2.strError)
- Return m_bResFromExeThread
- End Function
