L_TwainGetNumericContainerSTRINGValue

#include "lttwn.h"

L_LTTWN_API L_INT L_TwainGetNumericContainerSTRINGValue(pCapability, nIndex, twString)

TW_CAPABILITY * pCapability;	/* pointer to a structure */
L_INT nIndex;	/* value's index */
TW_STR1024 twString;	/* reference to a TW_STR1024 value */

Gets the specified value from a container.

Parameter	Description
pCapability	Pointer to a TW_CAPABILITY structure that references the container value to get.
nIndex	Index of the value to get. Possible values are:
	Value	Meaning
	LTWAIN_VALUE_COUNT	[-1] Update ppValue with the number of items in the item list of the specified container. This option is only valid if the container is of type TW_ARRAY or TW_ENUMERATION. If the container is of any other type, this function will return an error code.
	LTWAIN_VALUE_CURRENT	[-2] Update ppValue with the current value of the container. If the container is of type TW_RANGE, ppValue is updated with the CurrentValue member of the TW_RANGE structure. If the container is of type TW_ENUMERATION, ppValue is updated with the CurrentIndex member of the TW_ENUMERATION structure. If the container is of any other type, the function will return an error code.
	LTWAIN_VALUE_DEFAULT	[-3] Update ppValue with the default value of the container. If the container is of type TW_RANGE, ppValue is updated with the DefaultValue member of the TW_RANGE structure. If the container is of type TW_ENUMERATION, ppValue is updated with the DefaultIndex member of the TW_ENUMERATION structure. If the container is of any other type, the function will return an error code.
	LTWAIN_VALUE_MINIMUM	[-4] Update ppValue with the minimum value of the container. If the container is of type TW_RANGE, ppValue is updated with the MinValue member of the TW_RANGE structure. If the container is of any other type, the function will return an error code.
	LTWAIN_VALUE_MAXIMUM	[-5] Update ppValue with the maximum value of the container. If the container is of type TW_RANGE, ppValue is updated with the MaxValue member of the TW_RANGE structure. If the container is of any other type, the function will return an error code.
	LTWAIN_VALUE_STEPSIZE	[-6] Update ppValue with the step size of the container. If the container is of type TW_RANGE, ppValue is updated with the StepSize membr of the TW_RANGE structure. If the container is of any other type, the function will return an error code.
	>= 0	Update ppValue with the value at the specified index. If the container is of type TW_ONEVALUE, nIndex must be zero and ppValue will be updated with the value of the TW_ONEVALUE structure. If the container is of type TW_ARRAY or TW_ENUMERATION, ppValue will be updated with the value at the specified index in the list of items. If the container is of type TW_ENUMERATION or TW_ARRAY, the value must not exceed the number of items in the container's item list or the function will return an error code.
twString	A TW_STR1024 value to be updated with the specified container value.

Returns

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

Comments

Use this function to get a value from a container's item list when the item list type is TW_STR1024.

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_TwainGetNumericContainerItemType, L_TwainGetNumericContainerINTValue, L_TwainGetNumericContainerUINTValue, L_TwainGetNumericContainerBOOLValue, L_TwainGetNumericContainerFIX32Value, L_TwainGetNumericContainerFRAMEValue, L_TwainGetNumericContainerUNICODEValue.
Topics:	How to Work with the Containers
	TWAIN Functionality: Container Functions.

Example

L_INT TwainGetNumericContainerSTRINGValueExample(L_INT nItemType,HTWAINSESSION g_hSession)
{
   L_INT nRet;
   TW_CAPABILITY twCap;
   TW_STR1024 twString;

   // Fill the TW_CAPABILITY structure with values
   twCap.Cap = ICAP_HALFTONES;
   twCap.ConType = TWON_ONEVALUE;
   nRet = L_TwainGetCapability(g_hSession, &twCap, LTWAIN_CAPABILITY_GETCURRENT);
   if (nRet != SUCCESS) 
   {
      MessageBox (NULL, TEXT("Failed to get capability"), TEXT("ERROR"), MB_OK);
      return nRet;
   }

   nRet = L_TwainGetNumericContainerItemType(&twCap, &nItemType);
   if (nRet != SUCCESS)
   {
      MessageBox (NULL, TEXT("Failed to get capability item type"), TEXT("ERROR"), MB_OK);
      return nRet;
   }
   else if ( (nItemType == TWTY_STR32) || (nItemType == TWTY_STR64) || 
             (nItemType == TWTY_STR128) || (nItemType == TWTY_STR255) || 
             (nItemType == TWTY_STR1024) )
   {
      nRet = L_TwainGetNumericContainerSTRINGValue (&twCap, 0, twString);
      if (nRet != SUCCESS)
      {
         MessageBox (NULL, TEXT("Failed to get capability item value"), TEXT("ERROR"), MB_OK);
         return nRet;
      }
   }

   return nRet;
}