L_TwainSetImageFrame

#include "lttwn.h"

L_LTTWN_API L_INT L_TwainSetImageFrame(hSession, pFrame)

HTWAINSESSION hSession;

handle to an existing TWAIN session

pTW_FRAME pFrame;

pointer to a structure

Sets the image frame used when transferring images from the current TWAIN source.

Parameter

Description

hSession

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

pFrame

Pointer to a variable that contains the image frame value to set.

Returns

SUCCESS

The function was successful.

< 1

An error occurred. Refer to Return Codes.

Comments

The image frame specifies the size and location of the image to acquire. To obtain the current image frame value, call the L_TwainGetImageFrame 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_TwainGetImageFrame, L_TwainSetImageUnit, L_TwainGetImageUnit, L_TwainSetImageBitsPerPixel, L_TwainGetImageBitsPerPixel, L_TwainSetImageEffects, L_TwainGetImageEffects, L_TwainSetAcquirePageOptions, L_TwainGetAcquirePageOptions, L_TwainSetRGBResponse, L_TwainShowProgress, L_TwainEnableDuplex, L_TwainGetDuplexOptions, L_TwainSetMaxXferCount, L_TwainGetMaxXferCount, L_TwainFloatToFix32

Topics:

Getting and Setting Capabilities

 

TWAIN Functionality: Capability Functions

Example

L_LTTWNTEX_API  L_INT TwainSetImageFrameExample(HTWAINSESSION hSession) 
{ 
   L_INT nRet = SUCCESS; 
   nRet = L_TwainStartCapsNeg(hSession); 
   if(nRet != SUCCESS) 
      return nRet; 
   TW_FRAME frame; 
   nRet = L_TwainGetImageFrame (hSession, &frame); 
   if (nRet == SUCCESS) 
   { 
      frame.Left = L_TwainFloatToFix32(0); 
      frame.Top = L_TwainFloatToFix32(0); 
      frame.Right = L_TwainFloatToFix32(8.5); 
      frame.Bottom = L_TwainFloatToFix32(11); 
      nRet = L_TwainSetImageFrame(hSession, &frame); 
      if(nRet != SUCCESS) 
         return nRet; 
   } 
   else 
      return nRet; 
   nRet = L_TwainEndCapsNeg (hSession); 
   if(nRet != SUCCESS) 
      return nRet; 
   return SUCCESS; 
} 

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