LTWAINSAVEERRORCALLBACK Function

#include "lttwn.h"

L_INT pEXT_CALLBACK YourFunction (hSession, pCapability, uError, pUserData)

HTWAINSESSION hSession;	/* handle to an existing TWAIN session */
pTW_CAPABILITY pCapability;	/* pointer to a structure */
L_UINT uError;	/* error code */
L_VOID * pUserData;	/* pointer to additional parameters */

Called when an error occurs while saving capability data supported by a particular TWAIN source to a specific template file. The address of this callback is passed as an argument in L_TwainTemplateDlg.

Parameter	Description
hSession	Handle to an existing TWAIN session. This handle is obtained by calling the L_TwainInitSession function.
pCapability	Pointer to the TW_CAPABILITY structure that references the capability data that was being saved to a specific template file when the error occurred. For more information about TW_CAPABILITY, refer to the TWAIN 1.9 specification from the site http://www.twain.org/.
uError	Error code.
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_TwainTemplateDlg.)
	Keep in mind that this is a void pointer, which must be cast to the appropriate data type within your callback function.

Returns

SUCCESS	The function was successful.
SUCCESS_RETRY	Retry saving the capability value.
SUCCESS_ABORT	Abort the saving procedure.
SUCCESS_DELETE	Abort saving procedure and delete the file.

Comments

The user should not free the pointer to the TW_CAPABILITY structure within this callback.

Required DLLs and Libraries

LTTWN

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_TwainTemplateDlg.
Topics:	TWAIN Functionality: Callback Functions.