L_TwainGetNumericContainerINTValue

#include "lttwn.h"

L_LTTWN_API L_INT L_TwainGetNumericContainerINTValue(pCapability, nIndex, pnValue)

TW_CAPABILITY * pCapability;	pointer to a structure
L_INT nIndex;	value's index
L_INT *pnValue;	pointer to an integer 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.
pnValue	Pointer to an integer 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 integer.

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

L_INT TwainGetNumericContainerINTValueExample(L_INT nItemType,HTWAINSESSION hSession) 
{ 
   L_INT nRet; 
   TW_CAPABILITY twCap; 
   L_INT nValue; 
   nRet = L_TwainStartCapsNeg(hSession); 
   if(nRet != SUCCESS) 
      return nRet; 
   // Fill the TW_CAPABILITY structure with values 
   twCap.Cap = CAP_XFERCOUNT; 
   twCap.ConType = TWON_ONEVALUE; 
   nRet = L_TwainGetCapability(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_INT16) || (nItemType == TWTY_INT32) ) 
   { 
      nRet = L_TwainGetNumericContainerINTValue (&twCap, 0, &nValue); 
      if (nRet != SUCCESS) 
      { 
         MessageBox (NULL, TEXT("Failed to get capability item value"), TEXT("ERROR"), MB_OK); 
         return nRet; 
      } 
   } 
   nRet = L_TwainEndCapsNeg(hSession); 
   if(nRet != SUCCESS) 
      return nRet; 
   return nRet; 
}

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Function References

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