Help Version 19.0.2017.10.27
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#include "lttwn.h"
L_LTTWN_API L_INT L_TwainGetNumericContainerFRAMEValue(pCapability, nIndex, ptwFrame)
TW_CAPABILITY * pCapability; |
pointer to a structure |
L_INT nIndex; |
value's index |
TW_FRAME *ptwFrame; |
pointer to a TW_FRAME structure |
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. | |
| ptwFrame | Reference to a TW_FRAME value to be updated with the specified container value. | |
SUCCESS |
The function was successful. |
! = SUCCESS |
An error occurred. Refer to Return Codes. |
Use this function to get a value from a container's item list when the item list type is TW_FRAME.
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. |
L_INT TwainGetNumericContainerFRAMEValueExample(L_INT nItemType,HTWAINSESSION hSession){L_INT nRet;TW_CAPABILITY twCap;TW_FRAME twFrame;nRet = L_TwainStartCapsNeg(hSession);if(nRet != SUCCESS)return nRet;// Fill the TW_CAPABILITY structure with valuestwCap.Cap = ICAP_FRAMES;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_FRAME){nRet = L_TwainGetNumericContainerFRAMEValue (&twCap, 0, &twFrame);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;}