LTWAINSETPROPERTYCALLBACK

#include "lttwn.h"

L_INT pEXT_CALLBACK YourFunction (hSession, uCap, nStatus, pValue, pUserData)

Called for each property set. The address of this callback is passed as an argument to L_TwainSetProperties.

Parameters

HTWAINSESSION hSession

Handle to an existing TWAIN session. This handle is obtained by calling the L_TwainInitSession or L_TwainInitSession2 function.

L_UINT uCap

The capability being set.

L_INT nStatus

This variable holds the value of the error that occurred while the property was being set.

L_VOID * pValue

Pointer to the original value. The user can cast this depending on the type of the property, and modify it.

L_VOID * 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_TwainSetProperties.)

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

Returns

Comments

The user should not free the pValue parameter 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.