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How to show error icon when sync fails with cloud filter apis?

Srikar Kurapati 0 Reputation points
2025-06-04T07:03:29.4133333+00:00

I am trying to create VFS using cloud filter APIs and want to implement error handling. In OnFetchData if we get any errors I want to show error icon in sync status. Can someone help what API should be called to achieve this functionality. I have tried below but no luck

CF_OPERATION_INFO opInfo = { 0 };

CF_OPERATION_PARAMETERS opParams = { 0 };

opInfo.StructSize = sizeof(opInfo);

opInfo.Type = CF_OPERATION_TYPE_TRANSFER_DATA;

opInfo.ConnectionKey = callbackInfo->ConnectionKey;

opInfo.TransferKey = callbackInfo->TransferKey;

opParams.ParamSize = CF_SIZE_OF_OP_PARAM(TransferData);

opParams.TransferData.CompletionStatus = E_FAIL;

opParams.TransferData.Buffer = nullptr;

opParams.TransferData.Offset.QuadPart = callbackParameters->FetchData.RequiredFileOffset.QuadPart;

opParams.TransferData.Length.QuadPart = callbackParameters->FetchData.RequiredLength.QuadPart;

auto hr = CfExecute(&opInfo, &opParams)

Developer technologies | C++
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  1. Omkara Varshitha Kunapalli (INFOSYS LIMITED) 385 Reputation points Microsoft External Staff
    2025-08-18T07:00:31.97+00:00

    Thanks for reaching out !

    1. Correct Status Code: To show an error icon, you must use a STATUS_CLOUD_FILE_* error code in CompletionStatus. Using generic codes like E_FAIL will be converted to STATUS_CLOUD_FILE_UNSUCCESSFUL, which may not trigger the sync error icon.
    2. Generic codes like E_FAIL won’t trigger the icon. 
    3. Make sure CfExecute is called on the correct thread with proper access. 

     

    We are suggesting a code to fix.

    Update your code to use a more specific failure code like:

       opParams.TransferData.CompletionStatus = STATUS_CLOUD_FILE_PROVIDER_NOT_RUNNING; 

    Or any other appropriate STATUS_CLOUD_FILE_* code depending on the failure scenario.

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