In This Topic ▼

ShowDialogPreview Property

Summary

Gets or sets the option to continue to display the preview during a call to the ShowDialog method.

Syntax

C++/CLI

public virtual bool ShowDialogPreview { get; set; }

public: 
virtual property bool ShowDialogPreview { 
   bool get(); 
   void set (    bool ); 
}

Property Value

true if the preview will continue displaying during ShowDialog calls; false, otherwise.

Example

using Leadtools; 
using Leadtools.Multimedia; 
using LeadtoolsMultimediaExamples.Fixtures; 
 
 
public bool _result = false; 
public CaptureCtrlForm _form = new CaptureCtrlForm(); 
 
// capture control 
CaptureCtrl capturectrl; 
 
// output file 
string outFile = Path.Combine(LEAD_VARS.MediaDir, "CaptureCtrl_ShowDialogPreviewExample.avi"); 
 
public void ShowDialogPreviewExample() 
{ 
   // reference the capture control 
   capturectrl = _form.CaptureCtrl; 
 
   try 
   { 
      // set the source video device. use your device's name here 
      if (capturectrl.VideoDevices["USB"] == null) 
      { 
         throw new Exception("No USB video device available"); 
      } 
 
      capturectrl.VideoDevices["USB"].Selected = true; 
 
      // select video and audio compressors 
      capturectrl.VideoCompressors.Mpeg2.Selected = true; 
 
      // set the target file and format 
      capturectrl.TargetFile = outFile; 
      capturectrl.TargetFormat = TargetFormatType.AVI; 
 
      capturectrl.FrameRate = 5; 
      // 5 frames per second 
      capturectrl.UseFrameRate = true; 
      capturectrl.TimeLimit = 10; 
      // just 10 seconds of capture time 
      capturectrl.UseTimeLimit = true; 
 
 
      if (capturectrl.IsModeAvailable(CaptureMode.Video)) 
      { 
         // set show dialog preview, the preview mode will be enabled when ShowDialog is invoked 
         capturectrl.ShowDialogPreview = true; 
 
         // enable the preview 
         capturectrl.Preview = true; 
 
         // subscribe to the started event 
         capturectrl.Started += CaptureCtrl_Started; 
 
         // check the video capture dialog properties, if available 
         if (capturectrl.HasDialog(CaptureDlg.TargetFormat)) 
         { 
            capturectrl.ShowDialog(CaptureDlg.TargetFormat, _form); 
         } 
 
         // start capture 
         capturectrl.StartCapture(CaptureMode.Video); 
 
         // get the show dialog preview 
         bool ShowDialogPreview = capturectrl.ShowDialogPreview; 
 
         // set the result to what we expect 
         _result = (ShowDialogPreview && capturectrl.Preview); 
      } 
 
   } 
   catch (COMException) 
   { 
      _result = false; 
   } 
   catch (Exception) 
   { 
      _result = false; 
   } 
} 
 
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:\LEADTOOLS22\Media"; 
}

Requirements

Target Platforms

Reference

CaptureCtrl Class

CaptureCtrl Members

Download our FREE evaluation

Help Version 22.0.2022.12.7

Leadtools.Multimedia Assembly

Introduction

Getting Started

Namespaces

Leadtools.Multimedia Namespace

Leadtools.Multimedia.Common Namespace

Assemblies