IWiaDataTransfer::idtGetData method (wia_xp.h)

The IWiaDataTransfer::idtGetData method retrieves complete files from a Windows Image Acquisition (WIA) device.

Syntax

HRESULT idtGetData(
  [in, out] LPSTGMEDIUM      pMedium,
  [in]      IWiaDataCallback *pIWiaDataCallback
);

Parameters

[in, out] pMedium

Type: LPSTGMEDIUM

Pointer to the STGMEDIUM structure.

[in] pIWiaDataCallback

Type: IWiaDataCallback*

Pointer to the IWiaDataCallback interface.

Return value

Type: HRESULT

This method can return any one of the following values:

This method will return a value specified in Error Codes, or a standard COM error if it fails for any reason other than those specified in the preceding table.

Remarks

In most respects, this method operates identically to the IDataObject::GetData method. The primary difference is that IWiaDataTransfer::idtGetData provides an additional parameter for a pointer to the IWiaDataCallback interface. Applications use this optional parameter to obtain status notifications during the data transfer. If no status notifications are needed, it should be set to zero.

The format of the data transfer is determined by the values of the item's WIA_IPA_FORMAT and WIA_IPA_TYMED properties. The application sets these properties with calls to the IWiaPropertyStorage::WriteMultiple method.

Unlike the IWiaDataTransfer::idtGetBandedData method, IWiaDataTransfer::idtGetData transfers a complete file from a WIA device to an application rather than just a single band of data. The pMedium parameter is a pointer to the STGMEDIUM structure which contains information on the storage medium to be used for the data transfer. Programs use the pIWiaDataCallback parameter to pass this method a pointer to the IWiaDataCallback interface. Periodically, this method will use the interface pointer to invoke the BandedDataCallback method and provide the application with status information about the data transfer in progress.

Pass NULL as the value of the lpszFileName member of the pMedium structure to allow WIA to determine the file name and location for the new file. Upon return, the lpszFileName member of the pMedium structure contains the location and name of the new file.

If the value returned by this method is a COM SUCCESS value or the transfer is a multipage file transfer, and the error code returned is WIA_ERROR_PAPER_JAM, WIA_ERROR_PAPER_EMPTY, or WIA_ERROR_PAPER_PROBLEM, WIA does not delete the file.

Requirements