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 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.

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

Functions:

L_TwainSetTransferOptions, L_TwainGetTransferOptions, L_TwainGetSupportedTransferMode, L_TwainSetResolution, L_TwainGetResolution, L_TwainSetImageFrame, L_TwainGetImageFrame, L_TwainSetImageUnit, L_TwainGetImageUnit, L_TwainSetImageBitsPerPixel, L_TwainGetImageBitsPerPixel, L_TwainSetImageEffects, L_TwainGetImageEffects, L_TwainSetAcquirePageOptions, L_TwainGetAcquirePageOptions, L_TwainSetRGBResponse, L_TwainShowProgress, L_TwainGetDuplexOptions, L_TwainSetMaxXferCount, L_TwainGetMaxXferCount

Topics:

Getting and Setting Capabilities

 

TWAIN Functionality: Capability Functions

Example

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; 
} 

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