not all devices support what you’re trying, most of the ones that i’ve seen – but not all. to avoid the scanners userinterface set showUi to false (search the twain spec for showUi for more)
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not all devices support what you’re trying, most of the ones that i’ve seen – but not all. to avoid the scanners userinterface set showUi to false (search the twain spec for showUi for more)