References ▼
#include "lttwn.h"
L_LTTWN_API L_INT L_TwainEnableDuplex(hSession, bEnableDuplex)
Enables or disables the duplex mode.
Handle to an existing TWAIN session. This handle is obtained by calling the L_TwainInitSession or L_TwainInitSession2 function.
Flag that indicates whether to enable or disable the duplex mode. Possible values are:
| Value | Meaning |
|---|---|
| TRUE | Enable the duplex mode. |
| FALSE | Disable the duplex mode. |
| Value | Meaning |
|---|---|
| SUCCESS | The function was successful. |
| < 1 | An error occurred. Refer to Return Codes. |
L_TwainEnableDuplex internally sets the duplex-enabled capability CAP_DUPLEXENABLED. For more information on these capabilities, refer to the TWAIN specification.
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
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;}