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AcquireSimple Method

Summary

Acquires one or more images from a WIA source.

Syntax

C++

public DialogResult AcquireSimple( 
   WiaVersion version, 
   IntPtr owner, 
   object item, 
   WiaDeviceType deviceType, 
   WiaAcquireFlags flags, 
   WiaProperties properties 
)

Public Function AcquireSimple( 
   ByVal version As WiaVersion, 
   ByVal owner As System.IntPtr, 
   ByVal item As Object, 
   ByVal deviceType As WiaDeviceType, 
   ByVal flags As WiaAcquireFlags, 
   ByVal properties As WiaProperties 
) As DialogResult

public:  
   DialogResult^ AcquireSimple( 
       WiaVersion^ version, 
      System::IntPtr owner, 
      Object^ item, 
      WiaDeviceType^ deviceType, 
      WiaAcquireFlags^ flags, 
      WiaProperties^ properties 
   )

Parameters

version
The WIA version to be used. Possible values are:

Value	Meaning
WiaVersion.Version1	Use WIA version 1.0.
WiaVersion.Version2	Use WIA version 2.0.

owner
Window handle of your application window.

item
This parameter is only used when acquiring from a scanner device while the ShowUserInterface flag is NOT set. Use this parameter to specify the scanner's paper source (Feeder or Flatbed).

This flag is optional. If you are using WIA 1.0, you can change the paper source by changing the WiaPropertyId.ScannerDeviceDocumentHandlingSelect property value for the root item, or by enumerating the available scanner items and passing the desired scanner item.

If you are using WIA 2.0, either enumerate the available scanner items and pass the desired scanner item; or pass null (Nothing in VB), in which case the enumeration will be performed internally and the first enumerated item will be used as the source item.

deviceType
Specifies which type of WIA device to use. Possible values are:

Value	Meaning
WiaDeviceType.Default	Generic WIA device. During device enumerations, this constant is used to enumerate all WIA devices. This is the default value.
WiaDeviceType.Scanner	The device is a scanner.
WiaDeviceType.DigitalCamera	The device is a camera. Note that this type of device is not supported by Windows Vista and later.
WiaDeviceType.StreamingVideo	The device contains streaming video. Note that this type of device is not supported by Windows Server 2003, Windows Vista, or later.

flags
Flag that determines certain actions of the WIA image acquisition selection dialog box. Possible values are:

Value	Meaning
WiaAcquireFlags.None	Default behavior for the device image acquisition dialog box.
WiaAcquireFlags.NoDefault	Force displaying the Select Device dialog box even if there is only one device available.
WiaAcquireFlags.SingleImage	Restrict image selection to a single image in the device image acquisition dialog box. This flag is not available if you are using WIA version 2.0.
WiaAcquireFlags.ShowUserInterface	Show the manufacturer's image acquisition dialog box.
WiaAcquireFlags.UseCommonUI	Use the system user interface (UI), if available, rather than the vendor-supplied UI. If the system UI is not available, the vendor UI is used.

properties

A WiaProperties structure containing the WIA properties for the currently selected data source.

Return Value

One of the DialogResult values. If an error occurs, an exception is thrown.

Remarks

This is a high level acquire function that can be called directly. When using this function, the following functions are called internally:

You can change the AcquireOptions property members before calling this method to control some options while acquiring from the WIA source.

Set this method to perform memory transfer or file transfer by performing one of the following actions:

Set the transfer mode through the WiaSession.SetProperties method.
Set the transfer mode by setting the value parameter to any of the transfer modes available through the WiaTransferMode and then call the WiaSession.SetPropertyLong method, passing WiaPropertyId.ItemTymed for the propertyId parameter of this method.

To perform memory transfer, add the AcquireEvent event to receive the acquired page(s). The event will also provide you with the percent completion of the page transfer progress.

When performing file transfer it is optional to add the AcquireEvent event since the event will only provide you with the saved file path and the percent completion of the file saving process.

When performing file transfer two properties within the WiaSession class become available:

FilesCount - contains the number of files being saved.
FilesPaths - a collection that contains the saved file paths and filenames.

To cancel the acquire operation, add the AcquireEvent event and set the Cancel member of the WiaAcquireEventArgs to true.

For more information, refer to How to Acquire from the WIA Source.

Example

using Leadtools; 
using Leadtools.Codecs; 
using Leadtools.Wia; 
 
public void AcquireSimpleExample(IntPtr parent) 
{ 
   WiaSession wiaSession = new WiaSession(); 
 
   // Initialize and fill the required fields from the WiaDataTransferProperties structure  
   WiaDataTransferProperties wiaDataTransferProperties = WiaDataTransferProperties.Empty; 
   wiaDataTransferProperties.TransferMode = WiaTransferMode.Memory; 
   wiaDataTransferProperties.Compression = WiaCompressionMode.None; 
 
   // Initialize and fill the required fields from the WiaProperties structure  
   WiaProperties wiaProperties = WiaProperties.Empty; 
   wiaProperties.DataTransfer = wiaDataTransferProperties; 
 
   wiaSession.AcquireEvent += new EventHandler<WiaAcquireEventArgs>(wiaSession_AcquireSimpleEvent); 
 
   wiaSession.AcquireSimple(WiaVersion.Version1, parent, null, WiaDeviceType.Default, WiaAcquireFlags.ShowUserInterface | WiaAcquireFlags.UseCommonUI, wiaProperties); 
 
   wiaSession.AcquireEvent -= new EventHandler<WiaAcquireEventArgs>(wiaSession_AcquireSimpleEvent); 
} 
 
public void wiaSession_AcquireSimpleEvent(object sender, WiaAcquireEventArgs e) 
{ 
   Application.DoEvents(); 
 
   if ((e.Flags & WiaAcquiredPageFlags.StartOfPage) == WiaAcquiredPageFlags.StartOfPage) 
      Console.WriteLine("Beginning of data transfer."); 
   else if ((e.Flags & WiaAcquiredPageFlags.EndOfPage) == WiaAcquiredPageFlags.EndOfPage) 
      Console.WriteLine("End of data transfer."); 
 
   if (e.Image != null) 
   { 
      // You can load the image here.  
   } 
}

Imports Leadtools 
Imports Leadtools.Codecs 
Imports Leadtools.Wia 
 
<TestMethod()> _ 
Public Sub AcquireSimpleExample(ByVal parent As IntPtr) 
   Dim wiaSession As WiaSession = New WiaSession() 
 
   ' Initialize and fill the required fields from the WiaDataTransferProperties structure  
   Dim wiaDataTransferProperties As WiaDataTransferProperties = wiaDataTransferProperties.Empty 
   wiaDataTransferProperties.TransferMode = WiaTransferMode.Memory 
   wiaDataTransferProperties.Compression = WiaCompressionMode.None 
 
   ' Initialize and fill the required fields from the WiaProperties structure  
   Dim wiaProperties As WiaProperties = wiaProperties.Empty 
   wiaProperties.DataTransfer = wiaDataTransferProperties 
 
   AddHandler wiaSession.AcquireEvent, AddressOf Of WiaAcquireEventArgs 
 
   wiaSession.AcquireSimple(WiaVersion.Version1, parent, Nothing, WiaDeviceType.Default, WiaAcquireFlags.ShowUserInterface Or WiaAcquireFlags.UseCommonUI, wiaProperties) 
 
   RemoveHandler wiaSession.AcquireEvent, AddressOf Of WiaAcquireEventArgs 
End Sub 
 
Public Sub session_AcquireSimpleEvent(ByVal sender As Object, ByVal e As WiaAcquireEventArgs) 
   Application.DoEvents() 
 
   If (e.Flags And WiaAcquiredPageFlags.StartOfPage) = WiaAcquiredPageFlags.StartOfPage Then 
      Console.WriteLine("Beginning of data transfer.") 
   ElseIf (e.Flags And WiaAcquiredPageFlags.EndOfPage) = WiaAcquiredPageFlags.EndOfPage Then 
      Console.WriteLine("End of data transfer.") 
   End If 
 
   If Not e.Image Is Nothing Then 
      ' You can load the image here. 
   End If 
End Sub