DTWAIN_SetBlankPageDetectionString

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The DTWAIN_SetBlankPageDetectionString function allows detection of blank pages when acquiring from a TWAIN device, and optionally allows automatic discarding of blank pages.

DTWAIN_BOOL DTWAIN_SetBlankPageDetectionString (

DTWAIN_SOURCE	Source,
LPCTSTR	threshold,
LONG	options,
DTWAIN_BOOL	bEnable );

Parameters

Source

A DTWAIN_SOURCE denoting a TWAIN Source.

threshold

Sets the percentage of white pixels to black pixels to determine if a page is blank.

options

Sets the auto-discard options when processing blank pages.

bEnable

Enables/disables the blank page processing mechanism.

Return Values

The return value is TRUE if successful. Otherwise FALSE is returned.

Comments

The DTWAIN_SetBlankPageDetectionString function works exactly the same way as DTWAIN_SetBlankPageDetection, with the exception of the LPCTSTR parameters, which are strings that denote the values to use.

For example:

DTWAIN_SetBlankPageDetectionString( Source, "98.5", DTWAIN_BP_AUTODISCARD_ANY, TRUE)

TWAIN State Transitions

None

Prerequisite Function Call(s)

DTWAIN_SysInitialize

DTWAIN Source Selection Function