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ScreenCaptureException Class

Summary

The exception that is thrown when a LEADTOOLS ScreenCapture error occurs.

Syntax

C++

[SerializableAttribute()] 
public class ScreenCaptureException : LeadtoolsException

  
<SerializableAttribute()> 
Public Class ScreenCaptureException  
   Inherits Leadtools.LeadtoolsException 
   Implements System.Runtime.InteropServices._Exception, System.Runtime.Serialization.ISerializable

[SerializableAttribute()] 
public ref class ScreenCaptureException : public Leadtools.LeadtoolsException, System.Runtime.InteropServices._Exception, System.Runtime.Serialization.ISerializable

Example

using Leadtools; 
using Leadtools.Codecs; 
using Leadtools.ScreenCapture; 
 
void scEngine_CaptureInformation(object sender, ScreenCaptureInformationEventArgs e) 
{ 
   // Make sure that the image was captured successfully 
   Debug.Assert(e.Image != null); 
 
   // Define codecs class object to save the image 
   RasterCodecs codecs = new RasterCodecs(); 
   codecs.ThrowExceptionsOnInvalidImages = true; 
 
   // Save the resulted Image 
   codecs.Save(e.Image, Path.Combine(LEAD_VARS.ImagesDir, "Out_CapturedImage.bmp"), RasterImageFormat.Bmp, 24); 
 
 
   // NOTE: e.Information is a ScreenCaptureInformation structure filled with information 
   // about the captured image, this information can be used here 
   // Display a MessageBox with the bounds of the capture area 
   MessageBox.Show("Captured Area Bounds:\n" + 
      "Top:" + e.Information.Area.Top.ToString() + "\n" + 
      "Left:" + e.Information.Area.Left.ToString() + "\n" + 
      "Right:" + e.Information.Area.Right.ToString() + "\n" + 
      "Bottom:" + e.Information.Area.Bottom.ToString()); 
 
   // everything worked fine 
   e.Cancel = false; 
} 
 
public void ScreenCaptureExceptionExample() 
{ 
   ScreenCaptureEngine.Startup(); 
   ScreenCaptureEngine scEngine = new ScreenCaptureEngine(); 
   ScreenCaptureInformation captureInformation = null; 
   scEngine.CaptureInformation += new EventHandler<ScreenCaptureInformationEventArgs>(scEngine_CaptureInformation); 
 
   try 
   { 
      MessageBox.Show("After you close this message box,\npress F11 to capture the wallpaper."); 
      RasterImage image = scEngine.CaptureWallpaper(captureInformation); 
   } 
   catch (ScreenCaptureException ex) 
   { 
      //LEADTOOLS ScreenCapture Error 
      MessageBox.Show(string.Format("Could not capture wallpaper.{0}ScreenCapture error code: {1}{0}Message: {2}", Environment.NewLine, ex.Code, ex.Message)); 
   } 
   catch (Exception ex) 
   { 
      // Other errors 
      MessageBox.Show(string.Format("Could not capture wallpaper.{0}{1}", Environment.NewLine, ex.Message)); 
   } 
   ScreenCaptureEngine.Shutdown(); 
} 
 
static class LEAD_VARS 
{ 
   public const string ImagesDir = @"C:\Users\Public\Documents\LEADTOOLS Images"; 
}

Imports Leadtools 
Imports Leadtools.Codecs 
Imports Leadtools.ScreenCapture 
 
Public Sub scEngine_CaptureInformation(ByVal sender As Object, ByVal e As ScreenCaptureInformationEventArgs) Handles scEngine.CaptureInformation 
 
   ' Define codecs class object to save the image 
   Dim codecs As New RasterCodecs() 
   codecs.ThrowExceptionsOnInvalidImages = True 
 
   ' Save the resulted Image 
   codecs.Save(e.Image, Path.Combine(LEAD_VARS.ImagesDir, "CapturedImage.bmp"), RasterImageFormat.Bmp, 24) 
 
 
   ' NOTE: e.Information is a ScreenCaptureInformation structure filled with information 
   ' about the captured image, this information can be used here 
   ' Display a MessageBox with the bounds of the capture area 
   MessageBox.Show("Captured Area Bounds:" & Environment.NewLine & "Top:" & e.Information.Area.Top.ToString() & Environment.NewLine & "Left:" & 
                   e.Information.Area.Left.ToString() & Environment.NewLine & "Right:" + e.Information.Area.Right.ToString() & Environment.NewLine & 
                   "Bottom:" & e.Information.Area.Bottom.ToString()) 
 
   ' everything worked fine 
   e.Cancel = False 
End Sub 
 
WithEvents scEngine As ScreenCaptureEngine 
Public Sub ScreenCaptureExceptionExample() 
   ScreenCaptureEngine.Startup() 
   Dim captureInformation As ScreenCaptureInformation = Nothing 
   scEngine = New ScreenCaptureEngine() 
 
   Try 
      MessageBox.Show("After you close this message box," & Environment.NewLine & "press F11 to capture the wallpaper.") 
      Dim image As RasterImage = scEngine.CaptureWallpaper(captureInformation) 
   Catch ex As ScreenCaptureException 
      ' LEADTOOLS ScreenCapture Error 
      MessageBox.Show(String.Format("Could not capture wallpaper.{0}ScreenCapture error code: {1}{0}Message: {2}", Environment.NewLine, ex.Code, ex.Message)) 
   Catch ex As Exception 
      ' Other errors 
      MessageBox.Show(String.Format("Could not capture wallpaper.{0}{1}", Environment.NewLine, ex.Message)) 
   End Try 
   ScreenCaptureEngine.Shutdown() 
End Sub 
 
Public NotInheritable Class LEAD_VARS 
   Public Const ImagesDir As String = "C:\Users\Public\Documents\LEADTOOLS Images" 
End Class