L_TwainSetResolution

#include "lttwn.h"

L_LTTWN_API L_INT L_TwainSetResolution(hSession, pXRes, pYRes)

Sets the horizontal and vertical resolution used to transfer images from the current TWAIN source.

Parameters

HTWAINSESSION hSession

Handle to an existing TWAIN session. This handle is obtained by calling the L_TwainInitSession or L_TwainInitSession2 function.

pTW_FIX32 pXRes

The horizontal resolution value to set.

pTW_FIX32 pYRes

The vertical resolution value to set.

Returns

Comments

This function internally sets the horizontal and vertical resolution capabilities ICAP_XRESOLUTION and ICAP_YRESOLUTION. For more information on these capabilities, refer to the TWAIN specification.

To obtain the current resolution value, call the L_TwainGetResolution 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 TwainSetResolutionExample(HTWAINSESSION hSession) 
{ 
   L_INT nRet = SUCCESS; 
 
   nRet = L_TwainStartCapsNeg (hSession); 
   if(nRet != SUCCESS) 
      return nRet; 
 
   TW_FIX32 XRes, YRes; 
   nRet = L_TwainGetResolution (hSession, &XRes, &YRes); 
   if (nRet == SUCCESS) 
   { 
      if (L_TwainFix32ToFloat(&XRes) != 300.0f) 
      { 
         XRes = L_TwainFloatToFix32(300.0f); 
         YRes = L_TwainFloatToFix32(300.0f);       
 
         nRet = L_TwainSetResolution(hSession, &XRes, &YRes); 
         if(nRet != SUCCESS) 
            return nRet; 
      } 
   } 
   else 
      return nRet; 
 
   nRet = L_TwainEndCapsNeg (hSession); 
   if(nRet != SUCCESS) 
      return nRet; 
   return SUCCESS; 
}