HWIASESSION hSession;

/* handle to an existing WIA session */

L_INT nFormatsCount;

/* enumerated formats count */

L_INT nTransferMode;

/* transfer mode for the enumerated format */

GUID * pFormat;

/* pointer to GUID structure that contains the enumerated format */

L_VOID * pUserData;

/* pointer to additional parameters */

Parameter

Description

hSession

Handle to an existing WIA session. This handle is obtained by calling the L_WiaInitSession function.

nFormatsCount

The count of the enumerated WIA device formats.

nTransferMode

The transfer mode for the received enumerated format.

pFormat

Pointer to a GUID structure that contains the received enumerated format.

pUserData

A void pointer that you can use to access a variable or structure containing data that your callback function needs. This gives you a way to receive data indirectly from the function that uses this callback function. (This is the same pointer that you pass in the pUserData parameter of L_WiaEnumFormats.)

Keep in mind that this is a void pointer, which must be cast to the appropriate data type within your callback function.

SUCCESS

The function was successful.

ERROR_USER_ABORT

The callback wants to abort the properties set process.

< 1

An error occurred. Refer to Return Codes.

LTWIA

For a listing of the exact DLLs and Libraries needed, based on the toolkit version, refer to Files To Be Included With Your Application.

Functions:

L_WiaEnumFormats, L_WiaInitSession, L_WiaEndSession.

Topics:

WIA Functionality: Property Functions

WIA Functionality: Callbacks