GdPictureImaging.TwainGetCapCurrentNumeric Method

Returns as numeric, the current value of a TWAIN capability.

public Boolean TwainGetCapCurrentNumeric(
    TwainCapabilities Cap, 
    ref Double CurrentValue
);

Visual Basic

Public Function TwainGetCapCurrentNumeric(
    ByVal Cap As TwainCapabilities, 
    ByRef CurrentValue As Double
) As Boolean

Parameters

Parameters	Description
Cap	A member of the TwainCapabilities enumeration.
CurrentValue	Output parameter. Current value of the selected TWAIN capability.

Returns

True if success, else False -> Use TwainGetLastResultCode() and TwainGetLastConditionCode() functions for diagnosing the error.

Remarks

Before using this function check that the TWAIN state is >= 4 (TWAIN_SOURCE_OPEN)

To get the TWAIN state, use the TwainGetState() function.

This function can be used to retrieve the following types of capabilities: TWTY_INT8 , TWTY_INT16, TWTY_INT32, TWTY_UINT8, TWTY_UINT16, TWTY_UINT32, TWTY_BOOL, TWTY_FIX32, TWTY_FRAME.

You can determine the type of each TWAIN capability using the TwainGetCapItemType function or looking the twain references from http://www.twain.org

Example

Catch the acquisition bit depth used by the default source

Copy Code

Dim CurrentCapValue As Double
 
oGdPictureImaging.TwainOpenDefaultSource(Me.Handle)
oGdPictureImaging.TwainGetCapCurrentNumeric(TwainCapabilities.ICAP_BITDEPTH, CurrentCapValue)
MsgBox "The current bit depth is: " + str(CurrentCapValue)
oGdPictureImaging.TwainCloseSource()