Re: Set the scan quality (dpi)

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This topic and its replies were posted before the current version of LEADTOOLS was released and may no longer be applicable.

#1 Posted : Monday, November 1, 2010 10:50:00 PM(UTC)

tthon

Groups: Registered
Posts: 6

I am using Lead Tool version 16.

I try to set the scan quality (200dpi) with the in VB6 code below and it hit "Invalid Capability Value". I have checked that it supports the ICAP_XRESOLUTION and ICAP_YRESOLUTION.

Is there any of the value is wrongly set?

    Set twCap = New TwainCapability
    twCap.Information.ContainerType = TwainContainerType_OneValue
    twCap.Information.Type = TwainCapabilityType_ImageYResolution
    twCap.OneValueCapability.itemType = TwainItemType_Fix32
    twCap.OneValueCapability.Value.IntegerValue = 200
    Call MyTwainSession.SetCapability(twCap, TwainSetCapabilityMode_Set)

    twCap.Information.Type = TwainCapabilityType_ImageXResolution
    twCap.OneValueCapability.itemType = TwainItemType_Fix32
    twCap.OneValueCapability.Value.IntegerValue = 200
    Call MyTwainSession.SetCapability(twCap, TwainSetCapabilityMode_Set)

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#2 Posted : Tuesday, November 2, 2010 6:38:50 AM(UTC)

Adam Boulad

Groups: Guests
Posts: 3,022

Was thanked: 2 time(s) in 2 post(s)

Use the following code to set the X resolution and Y resolution values:
'================
Dim twCap As TwainCapability
Dim data As New TwainItemValue
Set twCap = New TwainCapability
data.itemType = TwainItemType_Fix32
data.FloatValue = 200
twCap.Information.ContainerType = TwainContainerType.TwainContainerType_OneValue
twCap.Information.Type = TwainCapabilityType_ImageYResolution
twCap.OneValueCapability.itemType = TwainItemType_Fix32
Set twCap.OneValueCapability.Value = data
twnSession.SetCapability twCap, TwainSetCapabilityMode_Set

twCap.Information.Type = TwainCapabilityType_ImageXResolution
Set twCap.OneValueCapability.Value = data
twnSession.SetCapability twCap, TwainSetCapabilityMode_Set
'================

If you face the same error, try to use the Twain device using the standard Twain test utility from the Twain Working Group. This program is called Twacker and you can get it from here: http://www.twain.org/devfiles/twack.zip

Use the Twacker to get the supported DPI values by the device and see if it supports 200.

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