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PO.NET COM Issues with VB6 in Windows 7: Event doesn't work
 

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  1. PO.NET COM Issues with VB6 in Windows 7: Event doesn't work
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    <p>I have a .NET COM DLL that is used by Visual Basic 6. However, the CloseEvent is not working in Windows 7 and the following exception is throw. The VB6 process has no problem to invoke the Init method. Only CloseEvent is not working. Both Init and CloseEvent are working fine in my XP.</p> <pre><code>System.ServiceModel.FaultException`1[System.ServiceModel.ExceptionDetail]: Object does not match target type. (Fault Detail is equal to An ExceptionDetail, likely created by IncludeExceptionDetailInFaults=true, whose value is: System.Reflection.TargetException: Object does not match target type. at System.RuntimeType.InvokeDispMethod(String name, BindingFlags invokeAttr, Object target, Object[] args, Boolean[] byrefModifiers, Int32 culture, String[] namedParameters) at System.RuntimeType.InvokeMember(String name, BindingFlags bindingFlags, Binder binder, Object target, Object[] providedArgs, ParameterModifier[] modifiers, CultureInfo culture, String[] namedParams) at System.RuntimeType.ForwardCallToInvokeMember(String memberName, BindingFlags flags, Object target, Int32[] aWrapperTypes, MessageData&amp; msgData) at FMStation.VbComGateway.IVbComEventGateway.CloseEvent() at FMStation.VbComGateway.VbComGateway.TriggerCloseEvent() at FMStation.VbComGateway.VbComGateway.&lt;.ctor&gt;b__0(Object o, EventArgs e) at FMStation.VbComGateway.VbService.CloseApplication() at SyncInvokeCloseApplication(Object , Object[] , Object[] )...). </code></pre> <p>Here is the code as follow. This COM object has a Init method and a CloseEvent event.</p> <p><b>.NET</b></p> <pre><code>public interface IVbComGateway { void Init(string namedPipieId); } [InterfaceType(ComInterfaceType.InterfaceIsIDispatch)] [Guid("EA9C2EFC-7A13-4944-9901-29263F4F4B32")] [ComVisible(true)] public interface IVbComEventGateway { [DispId(1)] void CloseEvent(); } [ComVisible(true)] [ClassInterface(ClassInterfaceType.None)] [ComSourceInterfaces(typeof(IVbComEventGateway))] //Our event source is IMathEvents interface [ComDefaultInterface(typeof(IVbComGateway))] public class VbComGateway : IVbComGateway { [ComVisible(false)] public delegate void MyEventHandler(); private readonly VbService vbService; private ServiceHost host; public event MyEventHandler CloseEvent; public VbComGateway() { vbService = new VbService(); vbService.ClosingApplicationSignalReceived += (o, e) =&gt; TriggerCloseEvent(); } public void Init(string namedPipieId) { host = new ServiceHost(vbService, new[] { new Uri("net.pipe://localhost/" + namedPipieId) }); host.AddServiceEndpoint(typeof(IVbService), new NetNamedPipeBinding(), "PipeReverse"); host.Open(); } private void TriggerCloseEvent() { if (CloseEvent != null) CloseEvent(); } } </code></pre> <p>In <b>VB6</b>, I am using WithEvents to hook up this event:</p> <pre><code>Dim WithEvents gateway As FmsVbComGateway.VbComGateway Private Sub gateway_CloseEvent() CloseApplication Dim number As Integer For number = 0 To VB.Forms.Count - 1 Unload VB.Forms(number) Next number End Sub </code></pre> <p>Hope someone can help. Thanks!</p>
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    1. USJason Ching
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    1. COLooks like a DLL Hell problem to me, always around in COM. Giving that interface a [Guid] and not changing it when you update the DLL is indeed a good way to invoke DLL Hell. Use SysInternals' ProcMon to check that the expected DLLs are getting loaded by that VB6 app.
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      1. PO.NET COM Issues with VB6 in Windows 7: Event doesn't work
      1. USHans Passant
    2. COI am pretty sure the DLL is loaded by the VB6 becuause Init was called. Also, the above exception was throw from the COM object VbComGateway, which was created by the VB6 app.
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      1. PO.NET COM Issues with VB6 in Windows 7: Event doesn't work
      1. USJason Ching
    3. CO1) is the DLL registered? If registering for 64x, there are some nuances. You have to use regsvr32 from within the c:\Windows\syswow64 folder if this is a 32x DLL. 2) I assume XP was 32x and Windows 7 is 64x? Make sure the calling app runs in 32x mode (compile for x86).
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      1. PO.NET COM Issues with VB6 in Windows 7: Event doesn't work
      1. USps2goat
 

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