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POWCF file transfer with cancellation support
 

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  1. POWCF file transfer with cancellation support
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    <p>There are a lot of questions regarding file transfer with WCF. I've got everything working, including larges files in "chunked" mode. I have the option to cancel the file upload from the sending party (the one that starts the upload) and a callback interface to notify when the transfer is accepted, and canceled.</p> <p>My problem is cancelling the the upload from the receiving end. I can just force the channel to close, but i would like to notify the sending party of the cancellation. I'm not getting a solution for this. Any help?</p> <p>Thanks</p> <p>Update:</p> <p>I already figured it out. See the comment below. The service interface looks like this:</p> <p>By the way, the service interface looks like this:</p> <p><code></p> <pre><code>[ServiceContract(SessionMode = SessionMode.Required, CallbackContract = typeof(IFileTransferServiceCallback))] public interface IFileTransferService { [OperationContract(IsOneWay = true)] void RequestSendFile(FileTransferInvitation request); [OperationContract(IsOneWay=true)] void SendData(string id, byte[] data, int length); [OperationContract(IsOneWay = true)] void SendCancel(string id); [OperationContract(IsOneWay = true)] void SendEnd(string id); [OperationContract(IsOneWay = true)] void RequestSendCancelConfirmed(string id); } public interface IFileTransferServiceCallback { [OperationContract(IsOneWay = true)] void SendStarted(FileTransferInvitation transfer); [OperationContract(IsOneWay = true)] void RequestSendCancel(string id); [OperationContract(IsOneWay = true)] void SendCompleted(string id, Exception error); } </code></pre> <p></code></p>
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    1. USAntonio Dias
    1. USAntonio Dias
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    1. COSo, once an upload is begun, you already have a working implementation that will tell the service to cancel the upload? Or you're looking to add that implementation?
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      1. POWCF file transfer with cancellation support
      1. USTad Donaghe
    2. COYes, i already add the option to cancel but only on the client side. What i didn't have was an option to cancel from the server side. But never mind i already figured it out: I added a method on the callback interface to request a cancellation form the server. On the client side i stop sending data, confirm the cancellation to the server and close the channel. Its working nicely.
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      1. USAntonio Dias
    3. COMake that comment into an answer so people who come looking later will see how you solved the problem. :)
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      1. POWCF file transfer with cancellation support
      1. USTad Donaghe
 

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