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This enum is implemented in FRE for Windows.
ScanSourceUITypeEnum enumeration constants are used to specify which dialog box should be shown to the user to set scanning options. 
typedef enum {
 SSUIT_Fine,
 SSUIT_Scanner,
 SSUIT_None,
 SSUIT_All
}ScanSourceUITypeEnum;

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Elements

NameDescription
SSUIT\_FineUse the dialog box provided by FineReader Engine user interface.
SSUIT\_ScannerUse the dialog box provided by scanner.
SSUIT\_NoneDon’t show the dialog box. The scanning options will be specified using FineReader Engine API methods.
SSUIT\_AllAny type of user interface. This constant can be only used as an argument of the FindScanSources method, to indicate that your application can accept any type of user interface, but to one of the scanning methods you must provide a constant that signifies a specific UI type or none.

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Used in

IScanSource::AvailableUserInterfaceTypes IScanSource::BeginScan IScanSource::Scan IScanManager::FindScanSources