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I have downloaded the latest twain specs and it has an misleading error in it,in page 3-62:
TWAIN 1.9 Sources must support all TWAIN 1.8 required features and the following:
Operations
DG_CONTROL / DAT_USERINTERFACE / MSG_ENABLEDSUIONLY – this operation is
only required for mid- and high-volume scanners. It is strongly recommended for other
devices since it allows a way for an application to create predefined session setups for devices
that also include settings for custom features. Note that applications that support this
operation must also support DAT_CUSTOMDSDATA.DG_CONTROL / DAT_CAPABILITY / MSG_QUERYSUPPORTED
in page 5-124 one can read:
Requirements to be a TWAIN-Compliant Source
Requirements
TWAIN-compliant Sources must support the following:
Operations
DG_CONTROL / DAT_CAPABILITY / MSG_GET
<...many operations listed>
Many operations are listed there except
DG_CONTROL / DAT_CAPABILITY / MSG_QUERYSUPPORTED
In other words, an app developer can count on MSG_QUERYSUPPORTED
but an driver (source) developer is not required to implement it…
😥ha. keep reading, there are more
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