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AcquireSimple Method

Summary

Acquires one or more images from a WIA source.

Syntax

C#
VB
C++
public DialogResult AcquireSimple( 
   WiaVersion version, 
   IntPtr owner, 
   object item, 
   WiaDeviceType deviceType, 
   WiaAcquireFlags flags 
) 
  
Public Function AcquireSimple( _ 
   ByVal version As Leadtools.Wia.WiaVersion, _ 
   ByVal owner As IntPtr, _ 
   ByVal item As Object, _ 
   ByVal deviceType As Leadtools.Wia.WiaDeviceType, _ 
   ByVal flags As Leadtools.Wia.WiaAcquireFlags _ 
) As DialogResult 
public: 
DialogResult AcquireSimple(  
   Leadtools.Wia.WiaVersion version, 
   IntPtr owner, 
   Object^ item, 
   Leadtools.Wia.WiaDeviceType deviceType, 
   Leadtools.Wia.WiaAcquireFlags flags 
)  

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.

Return Value

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

Remarks

This is a high level acquire function that you can call 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:

When performing memory transfer you need to 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.

Value

Meaning

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

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

Example

C#
VB
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 WiaAcquireOptions structure 
   WiaAcquireOptions wiaAcquireOptions = WiaAcquireOptions.Empty; 
   wiaAcquireOptions.MemoryBufferSize = 32 * 1024; 
   wiaAcquireOptions.DoubleBuffer = true; 
   wiaSession.AcquireOptions = wiaAcquireOptions; 
 
   wiaSession.AcquireEvent += new EventHandler<WiaAcquireEventArgs>(wiaSession_AcquireSimpleEvent); 
 
   wiaSession.Acquire(parent, null, WiaAcquireFlags.ShowUserInterface | WiaAcquireFlags.UseCommonUI); 
 
   wiaSession.AcquireEvent -= new EventHandler<WiaAcquireEventArgs>(wiaSession_AcquireSimpleEvent); 
   wiaSession.Shutdown(); 
} 
 
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 session As WiaSession = New WiaSession() 
 
   ' Initialize and fill the required fields from the WiaAcquireOptions structure 
   Dim wiaAcquireOptions As WiaAcquireOptions = wiaAcquireOptions.Empty 
   wiaAcquireOptions.MemoryBufferSize = 32 * 1024 
   wiaAcquireOptions.DoubleBuffer = True 
   session.AcquireOptions = wiaAcquireOptions 
 
   AddHandler session.AcquireEvent, AddressOf session_AcquireSimpleEvent 
 
   session.Acquire(parent, Nothing, WiaAcquireFlags.ShowUserInterface Or WiaAcquireFlags.UseCommonUI) 
 
   RemoveHandler session.AcquireEvent, AddressOf session_AcquireSimpleEvent 
   session.Shutdown() 
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 

Requirements

Target Platforms

Help Version 19.0.2017.10.18
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