Creating a Basic LEADTOOLS DirectShow Capture Application

Perform the following steps to create and run a multimedia capture application using the LEADTOOLS Multimedia CaptureCtrl control.

Start Visual Studio.
Choose File->New->Project... from the menu.
In the New Project dialog box, choose either "Visual C# Projects" or "VB Projects" in the Projects Type List, and choose "Windows Application" in the Templates List.
Type the project name as "Multimedia Capture" in the Project Name field, and then click OK. If desired, type a new location for your project or select a directory using the Browse button, and then click OK.
In the "Solution Explorer" window, right-click "References" and choose "Add Reference..." from the context menu. In the "Add Reference" dialog box, click the ".NET" tab, select Leadtools.Multimedia and click OK. If this DLL does not appear under the .NET tab, click the Browse tab, navigate to the "<LEADTOOLS_INSTALLDIR>\Bin\Dotnet4\Win32" folder, and select the following DLL:
- Leadtools.Multimedia.dll
Click OK to add the above DLL to the application.

Make sure Form1 is in design view. Go to the toolbox (View->Toolbox) and drag a CaptureCtrl control on the form. NOTE: If you do not have CaptureCtrl in your toolbox, open the Tools menu and then choose Choose Toolbox Items from the menu. In the Reference Manager dialog, click Browse, navigate to the "<LEADTOOLS_INSTALLDIR>\Bin\Dotnet4\Win32" directory and then select Leadtools.Multimedia.dll. Click OK. After adding the control to the form, set the following properties for the capture control:

Property	Value
Name	_capturectrl
Anchor	Top, Bottom, Left, Right

Go to the toolbox (View->Toolbox) and drag a ProgressBar control on the form (below the capture control) and set the following properties:

Property Value

Name _progress

Anchor Bottom, Left, Right

Property	Value
Name	_progress
Anchor	Bottom, Left, Right

Go to the toolbox (View->Toolbox) and drag a Button control on the bottom of the form and set the following properties:

Property	Value
Name	_buttonCapture
Text	Capture
Anchor	Bottom, Right

Switch Form1 to code view (right-click Form1 in the Solution Explorer, then choose View Code) and add the following lines to the beginning of the file:
VB
```
Imports Leadtools.Multimedia 
```
C#
```
using Leadtools.Multimedia; 
```

Declare the following private variables:

Private _targetFile As String 
Private _captureTime As Integer

private string _targetFile; 
private int _captureTime;

Add an event handler to the Form1 Load event and code it as follows:

Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load 
'Note: Modify and uncomment the following line to remove the pop-up "NAG" dialog 
'Leadtools.Multimedia.Common.MultimediaSupport.UnlockModule("YOUR LTMM KEY",Leadtools.Multimedia.Common.LockType.Application, "YOUR APPLICATION ID") 
                 
   If (_capturectrl.VideoDevices.Count = 0) Then 
      Throw New Exception("No capture devices available") 
   End If 
                        
   _capturectrl.VideoDevices(0).Selected = True 
   _capturectrl.VideoCompressors.Mpeg2.Selected = True 
                     
   _targetFile = "capture.avi" 
   _captureTime = 30 
End Sub

private void Form1_Load(object sender, System.EventArgs e) 
{ 
//Note: Modify and uncomment the following line to remove the pop-up "NAG" dialog 
//Leadtools.Multimedia.Common.MultimediaSupport.UnlockModule("YOUR LTMM KEY", Leadtools.Multimedia.Common.LockType.Application, "YOUR APPLICATION ID"); 
                  
   if (_capturectrl.VideoDevices.Count == 0) 
      throw new Exception("No capture devices available"); 
                        
   _capturectrl.VideoDevices[0].Selected = true; 
   _capturectrl.VideoCompressors.Mpeg2.Selected = true; 
                     
   _targetFile = "capture.avi"; 
   _captureTime = 30; 
}

Add an event handler to the _capturectrl Progress event and code it as follows:

Private Sub _capturectrl_Progress(ByVal sender As System.Object, ByVal e As ProgressEventArgs) Handles _capturectrl.Progress 
   _progress.Value = CInt((_progress.Maximum * e.time) / (_captureTime * 1000)) 
End Sub

private void _capturectrl_Progress(object sender, ProgressEventArgs e) 
{ 
   _progress.Value = (int)((_progress.Maximum * e.time) / (_captureTime * 1000)); 
}

Add an event handler to the _capturectrl Complete event and code it as follows:

Private Sub _capturectrl_Complete(ByVal sender As System.Object, ByVal e As EventArgs) Handles _capturectrl.Complete 
   MessageBox.Show("Capture Complete") 
   _buttonCapture.Enabled = True 
End Sub

private void _capturectrl_Complete(object sender, EventArgs e) 
{ 
   MessageBox.Show("Capture Complete"); 
   _buttonCapture.Enabled = true; 
}

Add an event handler to the _buttonCapture Click event and code it as follows:

Private Sub _buttonCapture_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles _buttonCapture.Click 
   Try 
      _capturectrl.Preview = True 
      _capturectrl.TargetFile = _targetFile 
      _capturectrl.UseTimeLimit = True 
      _capturectrl.TimeLimit = _captureTime 
                        
      _capturectrl.StartCapture(CaptureMode.Video) 
      _buttonCapture.Enabled = False 
   Catch ex As Exception 
      MessageBox.Show(ex.Message) 
   End Try 
End Sub

private void _buttonCapture_Click(object sender, System.EventArgs e) 
{ 
   try 
   { 
      _capturectrl.Preview = true; 
      _capturectrl.TargetFile = _targetFile; 
      _capturectrl.UseTimeLimit = true; 
      _capturectrl.TimeLimit = _captureTime; 
                        
      _capturectrl.StartCapture(CaptureMode.Video); 
      _buttonCapture.Enabled = false; 
   } 
   catch (Exception ex) 
   { 
      MessageBox.Show(ex.Message); 
   } 
}