| UID | title | description | tech.root | ms.date | keywords | ms.keywords | req.header | req.include-header | req.target-type | req.target-min-winverclnt | req.target-min-winversvr | req.kmdf-ver | req.umdf-ver | req.ddi-compliance | req.unicode-ansi | req.idl | req.max-support | req.namespace | req.assembly | req.type-library | req.lib | req.dll | req.irql | targetos | req.typenames | f1_keywords | topic_type | api_type | api_location | api_name | ||||||||
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NF:wiamindr_lh.IWiaMiniDrvCallBack.MiniDrvCallback |
IWiaMiniDrvCallBack::MiniDrvCallback (wiamindr_lh.h) |
The MiniDrvCallback method provides a callback method for WIA minidrivers to use during a callback data transfer. |
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07/21/2022 |
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CallBack_ab4a8e02-c505-49d4-8933-27428333a00d.xml, IWiaMiniDrvCallBack interface [Imaging Devices],MiniDrvCallback method, IWiaMiniDrvCallBack.MiniDrvCallback, IWiaMiniDrvCallBack::MiniDrvCallback, MiniDrvCallback, MiniDrvCallback method [Imaging Devices], MiniDrvCallback method [Imaging Devices],IWiaMiniDrvCallBack interface, image.iwiaminidrvcallback_minidrvcallback, wiamindr_lh/IWiaMiniDrvCallBack::MiniDrvCallback |
wiamindr_lh.h |
Wiamindr.h |
Desktop |
Windows |
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The MiniDrvCallback method provides a callback method for WIA minidrivers to use during a callback data transfer.
Specifies a constant value that designates a callback status message. This value is used to determine the purpose of the callback, and can be one of the following values:
| Message | Definition |
|---|---|
| IT_MSG_DATA | Indicates that the transfer buffer contains a block of data. |
| IT_MSG_DATA_HEADER | Received before any data transfers. Indicates that the transfer buffer points to a WIA_DATA_CALLBACK_HEADER structure that defines elements of the data transfer. |
| IT_MSG_DEVICE_STATUS | Callback contains only status information about the device. |
| IT_MSG_FILE_PREVIEW_DATA | Indicates preview data is being transferred to the application. |
| IT_MSG_FILE_PREVIEW_DATA_HEADER | Indicates a header is being transferred to the application, prior to the preview data being transferred. |
| IT_MSG_NEW_PAGE | Indicates that the data transfer of a page is complete, and a new page is being sent. |
| IT_MSG_STATUS | Callback contains only status information about the transfer. |
| IT_MSG_TERMINATION | Indicates that the data transfer is complete. |
Specifies the status of the transfer. This parameter is a bitwise OR of the following values:
| Status | Definition |
|---|---|
| IT_STATUS_TRANSFER_FROM_DEVICE | Transferring data from device. |
| IT_STATUS_PROCESSING_DATA | Device and/or minidriver are processing the data. |
| IT_STATUS_TRANSFER_TO_CLIENT | Transferring data from the minidriver to the WIA service. |
Specifies the current percentage of data transferred.
Specifies the current offset (in bytes) into the transfer buffer from the beginning of the buffer.
Specifies the number of bytes contained in the transfer.
Points to a MINIDRV_TRANSFER_CONTEXT structure containing the data transfer values.
Reserved. Set to zero.
If the method succeeds, it returns S_OK. If the callback is canceled by the client application, the method returns S_FALSE. If the method fails, it returns a standard COM error code.
The percent complete values are sent directly from the driver. The WIA service does not adjust the values.
IT_MSG_FILE_PREVIEW_DATA_HEADER is for out-of-band-data. This allows the application doing a file transfer to display the banded data. This is useful for scroll-fed scanners that have an unknown length and no preview scan. The information reported in this message should be treated the same as IT_MSG_DATA_HEADER. If a driver supports this message, it can supply preview data during its file transfer.