L_TwainLockContainer

#include "lttwn.h"

L_LTTWN_API L_INT L_TwainLockContainer(pCapability, ppContainer)

TW_CAPABILITY * pCapability;	/* pointer to a structure */
void ** ppContainer;	/* pointer to a pointer to a structure */

Gets the container information for the specified capability.

Parameter	Description
pCapability	Pointer to a TW_CAPABILITY structure from which to get the container.
ppContainer	Pointer to be updated with a pointer to the container.

Returns

SUCCESS	The function was successful.
! = SUCCESS	An error occurred. Refer to Return Codes.

Comments

This function is used to lock the container present in the TW_CAPABILITY structure.

Once the user has the pointer to the container, the container may be changed. When the user has finished changing the container he or she must call L_TwainUnlockContainer to unlock the container. Note that this can also be accomplished using the C DLL GlobalLock and GlobalUnlock functions.

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_TwainUnlockContainer.
Topics:	How to Work with the Containers
	TWAIN Functionality: Container Functions.

Example

 L_INT TwainLockContainerExample(TW_CAPABILITY twCap)
{
   L_INT nRet;
   TW_ONEVALUE* ptwOneVal = NULL;

   if (twCap.ConType == TWON_ONEVALUE)
   {
      nRet = L_TwainLockContainer (&twCap, (L_VOID **)&ptwOneVal);
      if(nRet != SUCCESS)
         return nRet;
      if (ptwOneVal) 
      {
         // Do processing
         nRet = L_TwainUnlockContainer (&twCap);
         if(nRet != SUCCESS)
            return nRet;
      }
   }
   return SUCCESS;
}