References ▼
#include "lttwn.h"
L_LTTWN_API L_INT L_TwainEnableDuplex(hSession, bEnableDuplex)
HTWAINSESSION hSession; |
handle to an existing TWAIN session |
L_BOOL bEnableDuplex; |
flag |
Enables or disables the duplex mode.
| Parameter | Description | |
| hSession | Handle to an existing TWAIN session. This handle is obtained by calling the L_TwainInitSession or L_TwainInitSession2 function. | |
| bEnableDuplex | Flag that indicates whether to enable or disable the duplex mode. Possible values are: | |
| Value | Meaning | |
| TRUE | Enables the duplex mode. | |
| FALSE | Disables the duplex mode. | |
SUCCESS |
The function was successful. |
< 1 |
An error occurred. Refer to Return Codes. |
This function internally sets the duplex enabled capability CAP_DUPLEXENABLED. For more information on these capabilities, refer to www.twain.org/download.htm and click on the TWAIN Specification (Version 1.9).
To get the current values of these capabilities, call the L_TwainGetDuplexOptions function.
This function should be called after calling the L_TwainStartCapsNeg function and before calling the L_TwainEndCapsNeg function.
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. |
L_INT TwainEnableDuplexExample(HTWAINSESSION hSession){L_INT nRet;L_BOOL bEnableDuplex;L_INT nDuplexMode;nRet = L_TwainStartCapsNeg(hSession);if(nRet != SUCCESS)return nRet;nRet = L_TwainGetDuplexOptions (hSession, &bEnableDuplex, &nDuplexMode);if(nRet != SUCCESS)return nRet;if (bEnableDuplex != TRUE){nRet = L_TwainEnableDuplex(hSession, TRUE);if(nRet != SUCCESS)return nRet;}L_INT nMaxXfer;nRet = L_TwainGetMaxXferCount (hSession, &nMaxXfer);if(nRet != SUCCESS)return nRet;if (nMaxXfer != 10){nRet = L_TwainSetMaxXferCount (hSession, 10);if(nRet != SUCCESS)return nRet;}nRet = L_TwainEndCapsNeg (hSession);if(nRet != SUCCESS)return nRet;return SUCCESS;}