Re: Exposing .Net events as COM events

In the properties for the class there is a couple of COM settngs (VS2005 at least), COM Class and COM Visible, COM visible must be set ot True, I am not sure if COM Calss must be set to true as well.  If it is not these settings then I have no idea where to look.  I hope that is helpfull.


 
> Date: Mon, 22 Jun 2009 23:37:16 -0700
> From: [email protected]
> Subject: [ADVANCED-DOTNET] Exposing .Net events as COM events
> To: [email protected]
> 
> I hope someone can give me a hand.
> 
> 
> 
> I have an application that takes extensions. Extensions are called using
> standard COM and talks back to the application by firing standard COM
> events. I am now trying to write an extension in c# using VS2008 and
> .Net framework 2.0. The skeleton source is attached below.
> 
> 
> 
> What happens is this
> 
> - Application creates this object. Works.
> 
> - App calls QueryInterface for IConnectionPointContainer.
> Works.
> 
> - App calls FindConnectionPoint passing the GUID of the event
> interface. This fail with HRESULT 0x80040200. This code means that the
> specified event interface is not found.
> 
> 
> 
> I added code to the application to call EnumConnectionPoints to see what
> connection points the extension object thinks it supports. There are
> none. It's acting like the source interface is not defined.
> 
> 
> 
> I've found lots of samples of exposing .Net events to com. They all look
> like this source.
> 
> 
> 
> Hopefully, someone can spot what I've done wrong. Any help would be very
> much appreciated.
> 
> 
> 
> Thanks,
> 
> ++PLS
> 
> 
> 
> 
> 
> 
> 
> namespace PCIExtension.TestBarCodeReader
> 
> {
> 
> 
> 
> // This interface duplicates the IPCIExternalEvents interface
> 
> // defined in the PCI type library
> 
> 
> 
> [
> 
> Guid("9FC477F2-612E-4D5F-ABF1-BB02CB5E82CF"),
> 
> InterfaceType(ComInterfaceType.InterfaceIsIDispatch),
> 
> ComVisible(true)
> 
> ]
> 
> public interface IPCIExternalEvents
> 
> {
> 
> [DispId(0x1)]
> 
> void PCIAction
> 
> (
> 
> int readerIndex,
> 
> int action,
> 
> string message1,
> 
> string message2
> 
> );
> 
> }
> 
> 
> 
> 
> 
> [
> 
> Guid("8609574E-2CCA-4d26-9403-EF6CACC14D48"),
> 
> ProgId("PCIExtension.TestBarCodeReader"),
> 
> ClassInterface(ClassInterfaceType.None),
> 
> ComSourceInterfaces(typeof(IPCIExternalEvents)),
> 
> ComVisible(true)
> 
> ] 
> 
> public class TestBarCodeReader :
> 
> IPCIExternalDevice
> 
> {
> 
> int readerIndex;
> 
> 
> 
> BarCodeForm form;
> 
> 
> 
> void IPCIExternalDevice.ContinueTransaction(string data)
> 
> {
> 
> return; // noop for us
> 
> }
> 
> 
> 
> TPCIExternalDeviceType IPCIExternalDevice.DeviceType
> 
> {
> 
> get { return TPCIExternalDeviceType.tpedtBarCodeReader; }
> 
> }
> 
> 
> 
> void IPCIExternalDevice.Initialize(int readerIndexA, string
> initString)
> 
> {
> 
> System.Diagnostics.Debugger.Break();
> 
> 
> 
> readerIndex = readerIndexA;
> 
> String msg = "Index: " + readerIndex.ToString() + "\r\n"
> 
> + "Initialize: " + initString;
> 
> MessageBox.Show(msg, myself + " Initialize",
> MessageBoxButtons.OK);
> 
> 
> 
> form = new BarCodeForm();
> 
> form.BarCodeData += OnBarCodeData;
> 
> }
> 
> 
> 
> void IPCIExternalDevice.SetHost(string sysId)
> 
> {
> 
> return; // Noop
> 
> }
> 
> 
> 
> void IPCIExternalDevice.SetParamaters(string sysId, string
> parameters)
> 
> {
> 
> return; // Noop
> 
> }
> 
> 
> 
> void IPCIExternalDevice.StartTransaction(string Type, string
> Date, string Time, string Amount)
> 
> {
> 
> return; // Noop
> 
> }
> 
> 
> 
> void IPCIExternalDevice.StopTransaction()
> 
> {
> 
> return; // Noop
> 
> }
> 
> 
> 
> 
> 
> void OnBarCodeData(string data)
> 
> {
> 
> PCIAction(readerIndex, (int)TPCIExternalAction.tccaBarCode,
> 
> data, "");
> 
> }
> 
> 
> 
> 
> 
> public delegate void 
> 
> PCIActionEventHandler
> 
> ( int readerIndex, 
> 
> int action, 
> 
> string message1, 
> 
> string message2
> 
> ); 
> 
> 
> 
> 
> 
> public event PCIActionEventHandler PCIAction;
> 
> 
> 
> public TestBarCodeReader()
> 
> {
> 
> readerIndex = 0;
> 
> form = null;
> 
> }
> 
> }
> 
> }
> 
> 
> 
> 
> 
> 
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