| | Class | Description |
|---|
 | ApplicationIdentity | An object that represents the TWAIN identity of the application. |
| CapabilityContainer | This class contains the capability information. |
| CapabilityContainerArray | This class is an array type container for storing capability information. |
| CapabilityContainerEnum | A class which contains enumeration capability information. |
| CapabilityContainerFrame | This class implements a capability container for storing a frame value. |
| CapabilityContainerOneValue | This class implements a one value type container for storing capability information. |
| CapabilityContainerOneValueCollection | This class implements a collection of CapabilityContainerOneValue objects. |
| CapabilityContainerOneValueFloat | This class implements a capability container for storing a float value. |
| CapabilityContainerOneValueString | This class implements a capability container for storing a string value. |
| CapabilityContainerRange | This class implements a range type container for storing capability information. |
| CapabilityNotSupportedException | This exception is thrown if an operation is performed using an unsupported capability. |
| Caption | This class implements an object that stores the settings used to place a caption on images when they are scanned. |
| ClipboardException | This exception is thrown if an error occurs trying to open the clipboard with the CopyToClipboard or CutToClipboard method. |
| CompressedImageNotAvailableException | This exception is thrown if no compressed image is available for the requested operation or an unsupported compressed image format was returned in response to a StartSession. |
| DataSourceCollection | A read-only collection of Data Source product names which is set by calling the OpenDataSourceManager method. |
| DataSourceInvalidOperationException | This exception is thrown if the Data Source performs an operation that caused an exception. |
| ExtendedImageInfoContainer | This class implements extended image info. |
| ExtendedImageInfoContainerValue | This class implements a single value of extended image info. |
| ExtendedImageInfoContainerValueCollection | This class represents a collection of ExtendedImageInfoContainerValue objects. |
| ExtendedImageInfoContainerValueFloat | This class implements a float value of extended image info. |
| ExtendedImageInfoContainerValueString | This class implements a string value of extended image info. |
| FileCreateException | This exception is thrown if TwainPRO is unable to create the file specified in the Save method. |
| FileOpenException | This exception is thrown if TwainPRO is unable to open an existing file to append pages when saving a multi-page image file, or if TwainPRO is unable to open a settings file. |
| FileReadException | This exception is thrown if TwainPRO is unable to read an existing file to append pages when saving a multi-page image file, or if TwainPRO is unable to read a settings file. |
| FileWriteException | This exception is thrown if an error occurs while TwainPRO is attempting to save a file to the path specified in the Save method, or while TwainPRO is attempting to write a settings file. |
| FtpOptions | This class implements properties and methods necessary for authentication and remote processing when saving an image. |
| FtpTransferException | This exception is thrown if an error occurs trying to FTP an image. |
| ImageNotAvailableException | This exception is thrown if no image is available for the requested operation or an unsupported DIB format was returned in response to a StartSession. |
| IndexOutOfRangeException | This exception is thrown if the requested index was out of range for the property array. |
| InternalErrorException | This exception is thrown if an internal failure occurs. |
| InternetFilesNotInstalledException | This exception is thrown if the required Internet DLL file(s) are missing. |
| InvalidBitDepthException | This exception is thrown if an invalid image resolution for the selected file format or an unsupported bits per pixel was returned from a StartSession. |
| InvalidLicenseException | This exception is thrown if a user attempts to access functionality that is not covered under the license in effect. |
| InvalidPropertyException | This exception is thrown if a property was set or queried that was not valid for the current capability type. |
| Licensing | This class implements methods for setting the license information for the toolkit. |
| LoadSettingsException | This exception is thrown if an error occurs when loading a settings file. |
| OperationCancelledException | This exception is thrown if the user cancelled the requested operation. |
| OutOfMemoryException | This exception is thrown if TwainPRO is unable to allocate memory for the requested operation. |
| PegasusFilesNotInstalledException | This exception is thrown if the required Pegasus DLL file(s) are missing. |
| PropertyOrMethodNotAvailableException | This exception is thrown if the property or method requested is not currently available. |
| SaveOptions | This class implements file writing of image formats. |
| SaveOptionsJpeg | Implements SaveOptions for the JPEG file format. |
| SaveOptionsPdf | This class implements SaveOptions for the PDF file format. |
| SaveOptionsPic | This class implements objects for saving PIC options. |
| SaveOptionsPng | This class implements objects for saving Png options. |
| SaveOptionsTiff | Implements SaveOptions for the TIFF file format. |
| ScannedEventArgs | Arguments for a scanned event. |
| ScannedImage | This class implements the scanned image and image information. |
| ScannedImageData | This class implements objects that contain the scanned image information. |
| ScanningEventArgs | Arguments for a scanning event. |
| SequenceException | This exception is thrown if an illegal operation is performed for the current Source Manager or Source state. |
| SourceCompressedImageOnlyException | This exception is thrown for trying to save the TwainPro-compressed image when hardware compression was used and only the source-compressed image is available. |
| StringIsTooLongException | This exception is thrown if a TwainPRO property was set to a string with too many characters. |
| TiffTagItemNotFoundException | This exception is thrown if a TIFF tag item is not found. |
| TiffTagNotFoundException | This exception is thrown if a TIFF tag is not found. |
| TwainDevice | This class implements methods and properties for all TWAIN device interaction. |
| TwainDllLoadException | This exception is thrown if TwainPRO is unable to find or load TWAINDSM.dll. |
| TwainException | This exception is thrown if a TWAIN error occurs. |
| TwainPro | The main object for this component. |
| TwainProCompressedImageOnlyException | This exception is thrown for trying to save the source-compressed image when no hardware compression was used and only the TwainPro-compressed image is available. |
| TwainProException | This class implements the base class for TwainPro Exceptions. |
| UnsupportedFileFormatException | This exception is thrown if the default file type is set and a file is saved using the extension of a file format that is not supported by TwainPRO, or if an invalid settings file is loaded. Supported file types are BMP, JPEG, ePIC, TIF, and PDF. |
| ValueOutOfRangeException | This exception is thrown if a TwainPRO property was set to an invalid value. |
