DTWAIN_EnumContrastValuesEx

The DTWAIN_EnumContrastValuesEx function gets all of the possible contrast settings for a Source.

DTWAIN_ARRAY DTWAIN_EnumContrastValuesEx (

DTWAIN_SOURCE	Source,
DTWAIN_BOOL	bExpandRange );

Parameters

Source

An open TWAIN Source.

bExpandRange

Flag that determines whether the values will be expanded if the Source stores them in a TW_RANGE.

Return Values

If successful, a DTWAIN_ARRAY that will store the Source's contrast values. NULL is returned on failure. If the function fails, call DTWAIN_GetLastError() to get extended information.

Comments

The DTWAIN_EnumContrastValuesEx function has the same functionality as DTWAIN_EnumContrastValues, except that the DTWAIN_ARRAY is returned to the caller instead of the caller providing a pointer to a DTWAIN_ARRAY as a parameter.

TWAIN State Transitions

The Source must be in State 4 or higher

Prerequisite Function Call(s)

DTWAIN_SysInitialize

DTWAIN Source Selection Function