.NET DLL - event's arguments and object collections

Startbeitrag von Leo am 01.11.2010 18:27

Hi,

I'm trying to use a .NET DLL into a windev 12 project (tell me if my problem could be solved with 14 or 15). I have to issues i can't work around:

1) I have an event in my .net library that returns an Image as an argument. I'd like to catch that event, but I cant figure how to add the event with the argument in windev. My .NET argument has this signature:

Public Event evtMyNetEvent(ByVal MyImage As Drawing.Bitmap)

As the windev documentation says, i have to add the event handler. If I define something like this, the project compiles and I can run the application:

MyObject:add_evtMyNetEvent (DotNetDelegate("MyEvent", "MyNetObject.evtMyNetEvent"))

But I get a run time error, something about the missing argument. The windev documentation says that the definition should be something like this:

MyObject:add_evtMyNetEvent (DotNetDelegate("MyEvent", "MyNetObject.evtMyNetEvent"))

I can't define the without getting a design time error. I don't know what should be en this case. Anyone could help? And how does my windev's procedure definition has to be to capture that event an put that image in a picture control?

2) My .NET libraries has several functions returning object collections:

System.Collections.ObjectModel.Collection(Of MyObject)

How can I retrieve that collection in windev, and how can I iterate its elements?

Regards!

Antworten:

Old Post -Re: .NET DLL - event's arguments and object collections

Greetings C# Developers,

I am having a similar problem with DotNetDelegate. I can't create a delegate that is accepted by the .NET assembly. I have a C# example that works. I can access many of the initialization functions in the .NET assembly except for setting the callbacks. See below. I show only the "Streaming" callback for example purposes.

If anyone can help, I would gladly pay for help as long as I can afford it!

Thanks,
Jeff

My WD code and procedure:



// Test button code

nResult is int



nResult = gclPalm.DNET_BioAPI_SetGUICallbacks(gnHandle, ...

		DotNetDelegate(StreamingCallback, "DNET_BIOAPI_GUI_STREAMING_CALLBACK"),WIN_Pvs_Net, ... 

		DotNetDelegate(StateCallback, "DNET_BIOAPI_GUI_STATE_CALLBACK"),WIN_Pvs_Net) 

IF nResult = PalmSecureConstant::DNET_BioAPI_OK 

	IF gbVerbose THEN Info("Set_GUI_Callbacks OK #1")

	ReturnToCapture()

ELSE

	ShowError(nResult,"DNET_BioAPI_SetGUICallbacks #1")

END



// Local procedure 

PROCEDURE StreamingCallback(pclGuiStreamingCallbackCtx is object dynamic, pclBitmap is DNET_BioAPI_GUI_BITMAP)  

IMG_Palm = pclBitmap.Bitmap.Data

iResult is unsigned int = 0

RESULT iResult

C# Example code:



            //Set delegate methods

            ///////////////////////////////////////////////////////////////////////////

            try

            {

                stResult.result = m_PalmSecureIf.DNET_BioAPI_SetGUICallbacks(

                    m_ModuleHandle,

                    StreamingCallback,

                    this,

                    StateCallback,

                    this

                    );

                if (stResult.result != PalmSecureConstant.DNET_BioAPI_OK)

                {

                    m_PalmSecureIf.DNET_PvAPI_GetErrorInfo(stResult.errInfo);

                    Ps_Sample_Apl_CS_ErrorMessage(stResult.errInfo);

                    return false;

                }

            }

            catch (PalmSecureException e)

            {

                MessageBox.Show(

                    e.Message

                    + "Error No: " + e.ErrNumber

                    );

                return false;

            }

            ///////////////////////////////////////////////////////////////////////////





/// 

        ///  Process when streaming callback function is called.

        ///  This callback only show bitmap image.

        /// 

        /// Context set by BioAPI_SetGUICallback()

        /// Silhouette image

        /// 

        uint StreamingCallback(

            object GuiStreamingCallbackCtx,

            DNET_BioAPI_GUI_BITMAP Bitmap

        )

        {

            //Handle a guidance image

            ///////////////////////////////////////////////////////////////////////////

            MemoryStream silhouetteInfo = null;



            silhouetteInfo = new MemoryStream();

            silhouetteInfo.Write(

                Bitmap.Bitmap.Data,

                0,

                (int)Bitmap.Bitmap.Length

                );



            Ps_Sample_Apl_CS_ShowSilhouette(silhouetteInfo);



            silhouetteInfo.Dispose();

            ///////////////////////////////////////////////////////////////////////////



            return PalmSecureConstant.DNET_BioAPI_OK;

        }

von Jeff Graham - am 05.10.2013 16:04

->>Weiter mit dem kompletten Thema (2 Beiträge) unter .NET DLL - event's arguments and object collections

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