References ▼
#include "lttwn.h"
L_INT pEXT_CALLBACK YourFunction(hSession, pResConfig, pUserData)
HTWAINSESSION hSession; |
handle to an existing TWAIN session |
pFASTCONFIG pResConfig; |
pointer to a FASTCONFIG structure |
L_VOID *pUserData; |
pointer to additional parameters |
Called for each configuration test. The address of this callback is passed as an argument to L_TwainFindFastConfig.
Parameter |
Description |
hSession |
Handle to an existing TWAIN session. This handle is obtained by calling the L_TwainInitSession or L_TwainInitSession2 function. |
pResConfig |
Pointer to a FASTCONFIG structure that contains the scan configuration that is currently being tested. |
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_TwainFindFastConfig.) |
|
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. |
SUCCESS_ABORT |
Abort the testing configuration. |
If you return SUCCESS, then the scan configuration testing process will be continued, otherwise, the process will be stopped.
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. |
For an example, refer to L_TwainFindFastConfig.