twain/twain-samples

[Bug] Scanner Error and Status messages get lost [sf#29]

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Reported by jim0watters on 2010-04-22 15:47 UTC
- Better handling of error, warning, and status messages with condition codes
- printError used throughout base class retrieves the last condition code and discards it
- make printError virtual so derived classes can display the message plus have access to the condition code.
- Add control to MFC Sample app to displaying the last or current status.