EditGraph Method

Summary

Registers the current graph and runs the DirectShow GraphEdit utility.

Syntax
C#
VB
C++
public virtual void EditGraph() 
Public Overridable Sub EditGraph()  
public: 
virtual void EditGraph();  
Remarks

This method will display a modal dialog box indicating that the graph has been registered. The current thread is suspended during this time. The toolkit then attempts to invoke the GraphEdit utility from the DirectShow SDK. You can use GraphEdit's "Connect" menu option to view the registered graph. When done, exit GraphEdit, and click on the dialog's OK button to continue program execution.

Example
C#
VB
using Leadtools; 
using Leadtools.Multimedia; 
using LeadtoolsMultimediaExamples.Fixtures; 
 
public bool _result = false; 
public CaptureCtrlForm _form = new CaptureCtrlForm(); 
public CaptureCtrl _capturectrl; 
 
public void EditGraphExample() 
{ 
   // reference the capture control 
   _capturectrl = _form.CaptureCtrl; 
 
   // output file names 
   string outFile = Path.Combine(LEAD_VARS.MediaDir, "CaptureCtrl_EditGraphExample.mpg"); 
 
   try 
   { 
      // set the source video device, select using your device name here 
      if (_capturectrl.VideoDevices["USB"] == null) 
         throw new Exception("No USB video device available"); 
 
      _capturectrl.VideoDevices["USB"].Selected = true; 
 
      // select a video compressor 
      _capturectrl.VideoCompressors.Mpeg4.Selected = true; 
 
      // set the target file 
      _capturectrl.TargetFile = outFile; 
 
      // register the graph for GraphEdit  
      // you should see a message box that says the graph is registered  
      // once this message displays you can open GraphEdit and Connect to Remote Graph 
      _capturectrl.EditGraph(); 
 
      // set the started event handler 
      _capturectrl.Started += new EventHandler(CaptureCtrl_Started); 
 
      // run the capture 
      _capturectrl.StartCapture(CaptureMode.Video); 
 
      // set the result 
      _result = true; 
   } 
   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 (_capturectrl.State == CaptureState.Running) 
      Application.DoEvents(); 
} 
 
void CaptureCtrl_Started(object sender, EventArgs e) 
{ 
   // stop the capture (we do not need a complete capture for this example) 
   _capturectrl.StopCapture(); 
} 
 
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 CaptureCtrlForm = New CaptureCtrlForm() 
Public _capturectrl As CaptureCtrl 
 
Public Sub EditGraphExample() 
   ' reference the capture control 
   _capturectrl = _form.CaptureCtrl 
 
   ' output file names 
   Dim outFile As String = Path.Combine(LEAD_VARS.MediaDir, "CaptureCtrl_EditGraphExample.mpg") 
 
   Try 
      ' set the source video device, select using your device name here 
      If _capturectrl.VideoDevices("USB") Is Nothing Then 
         Throw New Exception("No USB video device available") 
      End If 
 
      _capturectrl.VideoDevices("USB").Selected = True 
 
      ' select a video compressor 
      _capturectrl.VideoCompressors.Mpeg4.Selected = True 
 
      ' set the target file 
      _capturectrl.TargetFile = outFile 
 
      ' register the graph for GraphEdit  
      ' you should see a message box that says the graph is registered  
      ' once this message displays you can open GraphEdit and Connect to Remote Graph 
      _capturectrl.EditGraph() 
 
      ' set the started event handler 
      AddHandler _capturectrl.Started, AddressOf CaptureCtrl_Started 
 
      ' run the capture 
      _capturectrl.StartCapture(CaptureMode.Video) 
 
      ' set the result 
      _result = True 
   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 _capturectrl.State = CaptureState.Running 
      Application.DoEvents() 
   Loop 
End Sub 
 
Private Sub CaptureCtrl_Started(ByVal sender As Object, ByVal e As EventArgs) 
   ' stop the capture (we don't need a complete capture for this example) 
   _capturectrl.StopCapture() 
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
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Leadtools.Multimedia Assembly