References ▼
#include "ltwrappr.h"
virtual L_INT LTwain::GetNumericContainerSTRINGValue(pCapability, nIndex, twString)
Gets the specified value from a container.
Pointer to a TW_CAPABILITY structure that references the container value to get.
Index of the value to get. Possible values are:
| Value | Meaning |
|---|---|
| LTWAIN_VALUE_COUNT | [-1] Update twString 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 twString with the current value of the container. If the container is of type TW_RANGE, twString is updated with the CurrentValue member of the TW_RANGE structure. If the container is of type TW_ENUMERATION, twString 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 twString with the default value of the container. If the container is of type TW_RANGE, twString is updated with the DefaultValue member of the TW_RANGE structure. If the container is of type TW_ENUMERATION, twString 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 twString with the minimum value of the container. If the container is of type TW_RANGE, twString 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 twString with the maximum value of the container. If the container is of type TW_RANGE, twString 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 twString with the step size of the container. If the container is of type TW_RANGE, twString is updated with the StepSize member of the TW_RANGE structure. If the container is of any other type, the function will return an error code. |
| >= 0 | Update twString with the value at the specified index. If the container is of type TW_ONEVALUE, nIndex must be zero and twString will be updated with the value of the TW_ONEVALUE structure. If the container is of type TW_ARRAY or TW_ENUMERATION, twString 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. |
A TW_STR1024 value to be updated with the specified container value.
| Value | Meaning |
|---|---|
| SUCCESS | The function was successful. |
| < 1 | 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_STR1024.
Required DLLs and Libraries
// initialize session and call this functionL_INT LTwain__GetNumericContainerSTRINGValueExample(LTwain *MyClass){L_INT nRet;L_INT nItemType;TW_STR1024 twString;TW_CAPABILITY twCap;// Fill the TW_CAPABILITY structure with valuestwCap.Cap = ICAP_HALFTONES;twCap.ConType = TWON_ONEVALUE;nRet = MyClass->GetCapability(&twCap, LTWAIN_CAPABILITY_GETCURRENT);if (nRet != SUCCESS){MessageBox (NULL, TEXT("Failed to get capability"), TEXT("ERROR"), MB_OK);return nRet;}nRet = MyClass->GetNumericContainerItemType(&twCap, &nItemType);if (nRet != SUCCESS){MessageBox (NULL, TEXT("Failed to get capability item type"), TEXT("ERROR"), MB_OK);return nRet;}else if (nItemType == TWTY_BOOL){nRet = MyClass->GetNumericContainerSTRINGValue (&twCap, 0, twString);if (nRet != SUCCESS){MessageBox (NULL, TEXT("Failed to get capability item value"), TEXT("ERROR"), MB_OK);return nRet;}}return SUCCESS;}