L_TwainEnableDuplex
#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 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. |
Returns
SUCCESS |
The function was successful. |
< 1 |
An error occurred. Refer to Return Codes. |
Comments
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. |
See Also
Example
L_INT TwainEnableDuplexExample(HTWAINSESSION hSession) { L_INT nRet; L_TwainStartCapsNeg (hSession); L_BOOL bEnableDuplex; L_INT nDuplexMode; 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; }