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This enum is implemented in FRE for Windows.
ScanSourceApiTypeEnum enumeration constants are used to specify the type of API supported by scanner. 
typedef enum {
 SSAT_Twain,
 SSAT_Wia,
 SSAT_All
}ScanSourceApiTypeEnum;

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Elements

NameDescription
SSAT\_TwainThis constant corresponds to TWAIN scanning API.
SSAT\_WiaThis constant corresponds to WIA scanning API.
SSAT\_AllThis constant signifies that both API types are supported.

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Used in

IScanSource::ApiType IScanManager::FindScanSources