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LTwain::GetExtendedImageInfo

Summary

Gets the extended image information related to the image acquired by the LTwain::Acquire function.

Syntax

#include "ltwrappr.h"

virtual L_INT LTwain::GetExtendedImageInfo(ptwExtImgInfo)

Parameters

TW_EXTIMAGEINFO * ptwExtImgInfo

Pointer to a TW_EXTIMAGEINFO structure that references extended image information to fill.

Returns

Value	Meaning
SUCCESS	The function was successful.
< 1	An error occurred. Refer to Return Codes.

Comments

This function can only be called during the LTwain::BitmapCallBack callback, when called by the LTwain::Acquire function, and only after a page has been acquired from a TWAIN source.

Extended image information can be Barcode text, Barcode data, etc. For more information on extended image information, refer to the TWAIN specification.

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.

Example

This function will be called if you call LTwain::Acquire function.

L_INT CMyTwain::BitmapCallBack(pBITMAPHANDLE pBitmap) 
{ 
   UNREFERENCED_PARAMETER(pBitmap); 
 
   L_INT nRet = SUCCESS;  
   TW_EXTIMAGEINFO * pExtImg = NULL;  
 
   pExtImg = (TW_EXTIMAGEINFO *)GlobalAllocPtr (GHND, sizeof (TW_EXTIMAGEINFO) + sizeof(TW_INFO));  
   if (pExtImg)  
   { 
      pExtImg->NumInfos = 2;  
      pExtImg->Info[1].InfoID = TWEI_BARCODECOUNT;  
      pExtImg->Info[1].ItemType = TWTY_UINT32;  
      pExtImg->Info[1].InfoID = TWEI_BARCODETYPE;  
      pExtImg->Info[1].ItemType = TWTY_UINT32;  
 
      if (GetExtendedImageInfo (pExtImg) == SUCCESS)  
      { 
         // Do processing to returned values 
         FreeExtendedImageInfoStructure(&pExtImg);  
      } 
 
      GlobalFreePtr (pExtImg);  
   } 
 
   return nRet;  
 
}