IWiaErrorHandler::ReportStatus method (wia_lh.h)

The ReportStatus method displays information about an error or status during a transfer. In some cases this method allows the user to recover from an error.

Syntax

HRESULT ReportStatus(
  [in] LONG      lFlags,
  [in] HWND      hwndParent,
  [in] IWiaItem2 *pWiaItem2,
  [in] HRESULT   hrStatus,
  [in] LONG      lPercentComplete
);

Parameters

[in] lFlags

Currently unused. Should be set to zero.

[in] hwndParent

Caller supplied handle of the window that should be used as the parent window for any dialog boxes. If this is set to NULL, no dialog boxes should be displayed.

[in] pWiaItem2

Pointer to theIWiaItem2 item being transferred.

[in] hrStatus

HRESULT variable that contains the status code received by the WIA transfer method, for example the IWiaDataCallback::BandedDataCallback method.

[in] lPercentComplete

Size of the data, in bytes, the pbData pointer refers to.

Return value

Returns a standard COM error code if the error cannot be recovered from, or if the user chooses to abort the transfer in response to the displayed dialog box. There is additional information on the return values in the remarks section. Otherwise this method returns one of the following values:

Remarks

The COM proxy callback object calls the WiaErrorHandler::ReportStatus method when the driver sends an IT_MSG_DEVICE_STATUS message to the IWiaDataCallback::BandedDataCallback method. The dialog box that this method displays provides the user with error or status information and possibly gives an opportunity to recover from the error and continue the transfer. The UI should provide only an informational dialog box and a chance to cancel the transfer if the HRESULT is SEVERITY_SUCCESS.

A driver that implements this method, should display a modal dialog box, owned by hwndParent, in response to a value of hrStatus for which FAILED(hrStatus) evaluates to TRUE. If FAILED(hrStatus) evaluates to FALSE, the value in hrStatus represents a nonfatal delay, and the dialog box displayed should be modeless. The dialog box should be removed when the status of the transfer changes. An error handler should return S_FALSE for unknown values of hrStatus.

The hrStatus parameter is set to WIA_STATUS_TRANSFER_BEGIN to inform the handler that a transfer has started. It is set to WIA_STATUS_TRANSFER_END when the transfer is complete.

If hrStatus is S_OK, the data transfer has resumed and no delay or error is currently in effect.

Requirements

See also

IWiaErrorHandler

IWiaErrorHandler::GetStatusDescription