L_TwainCancelAcquire

#include "lttwn.h"

L_LTTWN_API L_INT L_TwainCancelAcquire(hSession);

HTWAINSESSION hSession;

handle to an existing TWAIN session

Cancels the current acquire operation.

Parameter

Description

hSession

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

Returns

SUCCESS

The function was successful.

! = SUCCESS

An error occurred.  Refer to Return Codes.

Comments

Cancels the current acquire operation.

To cancel the acquire operation call this function inside the LTWAINACQUIRECALLBACK which is called by the L_TwainAcquireMulti function, or call this function inside the LTWAINBITMAPCALLBACK which is called by the L_TwainAcquire 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_TwainAcquire, L_TwainAcquireMulti, L_TwainFastAcquire

Topics:

How to Acquire from the TWAIN Source

 

TWAIN Functionality: Property Functions

Example

static L_INT EXT_CALLBACK BmpCB(HTWAINSESSION hSession, 
pBITMAPHANDLE pBitmap, 
L_VOID     * pUserData) 
{ 
   UNREFERENCED_PARAMETER(pBitmap); 
   UNREFERENCED_PARAMETER(pUserData); 
   L_TwainCancelAcquire(hSession); 
   return SUCCESS; 
} 
L_INT TwainCancelAcquireExample(pBITMAPHANDLE pBitmap,HTWAINSESSION g_hSession) 
{ 
   L_INT nRet; 
   nRet = L_TwainAcquire(g_hSession, 
   pBitmap, 
   sizeof(BITMAPHANDLE), 
   BmpCB, 
   LTWAIN_SHOW_USER_INTERFACE, 
   NULL, 
   NULL); 
   if (nRet == SUCCESS) 
      MessageBox(NULL, TEXT("The image acquisition process completed."), TEXT("Notice"), MB_OK); 
   else 
   { 
      MessageBox(NULL, TEXT(" The image acquisition process failed!"), TEXT("Error"), MB_OK); 
      return nRet; 
   } 
   return SUCCESS; 
} 

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