Progress Event

Summary

Occurs periodically during a conversion operation to notify percentage completed.

Syntax
C#
VB
C++
public event ProgressEventHandler Progress 
Public Event Progress As ProgressEventHandler 
public: 
event ProgressEventHandler^ Progress 
Event Data

The event handler receives an argument of type ProgressEventArgs containing data related to this event. The following ProgressEventArgs properties provide information specific to this event.

PropertyDescription
percent The percentage complete for convert progress notifications.
time The time elapsed for capture progress notifications.
Remarks

The event handler is passed a ProgressEventArgs containing the percentage completed.

Example
C#
VB
using Leadtools; 
using Leadtools.Multimedia; 
using LeadtoolsMultimediaExamples.Fixtures; 
 
public bool _result = false; 
public ConvertCtrlForm _form = new ConvertCtrlForm(); 
 
public void ProgressExample() 
{ 
   string inFile = Path.Combine(LEAD_VARS.MediaDir, "ConvertCtrl_Source.avi"); 
   string outFile = Path.Combine(LEAD_VARS.MediaDir, "ConvertCtrl_ProgressExample.avi"); 
 
   // reference the convert control 
   ConvertCtrl convertctrl = _form.ConvertCtrl; 
 
   try 
   { 
      // set the input and output files 
      convertctrl.SourceFile = inFile; 
      convertctrl.TargetFile = outFile; 
 
      // select video and audio compressors for the output 
      convertctrl.VideoCompressors.H264.Selected = true; 
      convertctrl.AudioCompressors.AMR.Selected = true; 
 
      // set our progress event handler 
      convertctrl.Progress += new ProgressEventHandler(ConvertCtrl_Progress); 
 
      // convert it now! 
      convertctrl.StartConvert(); 
   } 
   catch (COMException cex) 
   { 
      if (cex.ErrorCode == (int)ErrorCode.VFW_E_WRONG_STATE) 
         throw cex; 
      _result = false; 
   } 
   catch (Exception) 
   { 
      _result = false; 
   } 
 
   // we'll loop on the state and pump messages for this example. 
   // but you should not need to if running from a Windows Forms application. 
   while (convertctrl.State == ConvertState.Running) 
      Application.DoEvents(); 
} 
 
public void ConvertCtrl_Progress(object sender, ProgressEventArgs e) 
{ 
   // set the result to true if complete 
   if (e.percent == 100) 
      _result = true; 
} 
 
static class LEAD_VARS 
{ 
   public const string MediaDir = @"C:\Program Files (x86)\LEAD Technologies\LEADTOOLS 20\Media"; 
} 
Imports Leadtools 
Imports Leadtools.Multimedia 
Imports LeadtoolsMultimediaExamples.Fixtures 
 
Public _result As Boolean = False 
Public _form As ConvertCtrlForm = New ConvertCtrlForm() 
 
Public Sub ProgressExample() 
   Dim inFile As String = Path.Combine(LEAD_VARS.MediaDir, "ConvertCtrl_Source.avi") 
   Dim outFile As String = Path.Combine(LEAD_VARS.MediaDir, "ConvertCtrl_ProgressExample.avi") 
 
   ' reference the convert control 
   Dim convertctrl As ConvertCtrl = _form.ConvertCtrl 
 
   Try 
      ' set the input and output files 
      convertctrl.SourceFile = inFile 
      convertctrl.TargetFile = outFile 
 
      ' select the video and audio compressors for the output 
      convertctrl.VideoCompressors.H264.Selected = True 
      convertctrl.AudioCompressors.AMR.Selected = True 
 
      ' set our progress event handler 
      AddHandler convertctrl.Progress, AddressOf ConvertCtrl_Progress 
 
      ' convert it now! 
      convertctrl.StartConvert() 
   Catch cex As COMException 
      If cex.ErrorCode = CInt(ErrorCode.VFW_E_WRONG_STATE) Then 
         Throw cex 
      End If 
      _result = False 
   Catch e1 As Exception 
      _result = False 
   End Try 
 
   ' we'll loop on the state and pump messages for this example. 
   ' but you should not need to if running from a Windows Forms application. 
   Do While convertctrl.State = ConvertState.Running 
      Application.DoEvents() 
   Loop 
End Sub 
 
Public Sub ConvertCtrl_Progress(ByVal sender As Object, ByVal e As ProgressEventArgs) 
   ' set the result to true if complete 
   If e.percent = 100 Then 
      _result = True 
   End If 
End Sub 
 
Public NotInheritable Class LEAD_VARS 
   Public Const MediaDir As String = "C:\Program Files (x86)\LEAD Technologies\LEADTOOLS 20\Media" 
End Class 
Requirements

Target Platforms

Help Version 20.0.2019.11.25
Products | Support | Contact Us | Intellectual Property Notices
© 1991-2020 LEAD Technologies, Inc. All Rights Reserved.

Leadtools.Multimedia Assembly