Atalasoft DotImage 11.4
Atalasoft DotImage Class Library
Atalasoft.Twain
AcquireEventArgs Class
Acquisition Class
AlarmTypeFlags Enumeration
AsynchronousExceptionEventArgs Class
AsynchronousExceptionEventHandler Delegate
AutoDiscardMode Enumeration
BarCodeSearchMode Enumeration
BarCodeType Enumeration
BatchJobControl Enumeration
BeforeTwainDataTransferEventHandler Delegate
BitDepthReductionMode Enumeration
ClearBufferMode Enumeration
ColorFilterFlags Enumeration
CompressionMode Enumeration
CountryCode Enumeration
Device Class
DeviceCapability Enumeration
DeviceCollection Class
DeviceEventArgs Class
DeviceEventFlags Enumeration
DeviceEventHandler Delegate
DocumentFeeder Class
DocumentFeederAlignment Enumeration
DocumentFeederOrder Enumeration
DuplexMode Enumeration
FileInformation Class
FileItemType Enumeration
FileSystem Class
FileTransferEventArgs Class
FileTransferEventHandler Delegate
FlashMode Enumeration
FlipRotationMode Enumeration
FormDataCollection Class
HttpPost Class
ImageAcquiredEventHandler Delegate
ImageFilterMode Enumeration
ImagePixelType Enumeration
ImprinterEndorserMode Enumeration
ImprinterEndorserType Enumeration
InvalidStateException Class
ITwainDataStructure Interface
LanguageType Enumeration
LightPathMode Enumeration
LightSourceMode Enumeration
MemoryDataTransferEventArgs Class
MemoryDataTransferEventHandler Delegate
MemoryFileTransferEventArgs Class
MemoryFileTransferEventHandler Delegate
NoiseFilterMode Enumeration
OrientationMode Enumeration
OverscanMode Enumeration
PatchCodeType Enumeration
PowerSupplyMode Enumeration
QueryOperation Enumeration
SourceImageFormat Enumeration
StaticFrameSizeType Enumeration
TwainAutoSize Enumeration
TwainBarCode Class
TwainCameraSide Enumeration
TwainCapability Class
TwainConditionCode Enumeration
TwainContainer Enumeration
TwainController Class
TwainCustomData Class
TwainDataGroupFlags Enumeration
TwainDataImageInfoEventArgs Class
TwainDataTransferEventArgs Class
TwainDataTransferEventHandler Delegate
TwainDeviceCallbackEventArgs Class
TwainDeviceCallbackEventHandler Delegate
TwainDeviceEvent Class
TwainEvent Class
TwainEventMessage Enumeration
TwainException Class
TwainExtendedImageInfoID Enumeration
TwainExtendedImageInformation Class
TwainFeederPocket Enumeration
TwainFeederType Enumeration
TwainFileSystem Class
TwainHandle Class
TwainIccProfileOption Enumeration
TwainIdentity Class
TwainImageInfo Class
TwainImageLayout Class
TwainItemType Enumeration
TwainManager Class
TwainMemory Class
TwainPixelFlavor Enumeration
TwainResolution Class
TwainReturnCode Enumeration
TwainState Enumeration
TwainTransferMethod Enumeration
TwainTriplet Enumeration
TwainUserInterface Class
UnitType Enumeration
UnsupportedCapabilityException Class
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TwainDeviceCallbackEventHandler Delegate

This delegate is used with the RegisterTwainCallback(TwainDeviceCallbackEventHandler) method to allow the use of a callback instead of a message loop for device communication.

This feature is only available when using TWAIN 2.0 or higher.

Namespace:  Atalasoft.Twain
Assembly:  Atalasoft.DotTwain (in Atalasoft.DotTwain.dll) Version: 11.4.0.9.0.377 (.NET 4.5.2, x86)
Syntax
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public delegate ushort TwainDeviceCallbackEventHandler(
	TwainController controller,
	TwainDeviceCallbackEventArgs e
)

Parameters

controller
Type: Atalasoft.TwainTwainController
The TwainController that received the callback.
e
Type: Atalasoft.TwainTwainDeviceCallbackEventArgs
A TwainDeviceCallbackEventArgs containing information for this callback.

Return Value

Type: UInt16
The return code to send back to the driver.
Remarks
The callback must return quickly. If a process is going to take time, it must be performed in a separate thread.
See Also