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私はちょうど単純なアプリケーションを使ってスクリーンショットを定期的に取得しました。WPFアプリケーションが動くとフリーズ
私が持っている主な問題は、移動するとアプリケーションがフリーズすることです。
だから、主な目標は、スクリーンショットのこの影響を取り出すことで、スレッドとなど
私はここですべてのコードを入れて、それはそうuがそれを再現することができます動作します。
このコードの.NETプロファイリング情報は次のとおりです。
ん、私はそれを修正することができますどのように任意の手掛かり?
XAML
<Window x:Class="Screenshot.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="MainWindow" Height="350" Width="525" Loaded="Window_Loaded" >
<Grid Height="Auto">
<Image Name="Image1"/>
</Grid>
</Window>
C#
public partial class MainWindow : Window
{
public MainWindow()
{
InitializeComponent();
}
ScreenGrabber grabber;
private void Window_Loaded(object sender, RoutedEventArgs e)
{
grabber = new ScreenGrabber(5);
grabber.Changed += new ChangedEventHandler(grabber_Changed);
}
void grabber_Changed(object sender, EventArgs e)
{
Image1.Dispatcher.Invoke(new Action(() => {
BitmapSource bs = ((ScreenGrabber)sender).GetImage();
Image1.Width = bs.Width;
Image1.Height = bs.Height;
Image1.Source = bs;
}));
}
}
C#DLL
namespace MyScreenGrabber
{
public delegate void ChangedEventHandler(object sender, EventArgs e);
public class ScreenGrabber : Window
{
public event ChangedEventHandler Changed;
protected virtual void OnChanged(EventArgs e)
{
if (Changed != null)
Changed(this, e);
}
byte[] BitmapData { set; get; }
int Interval { set; get; }
DispatcherTimer Timer { set; get; }
public ScreenGrabber(int interval)
{
Interval = interval;
Timer = new DispatcherTimer();
Timer.Interval = new TimeSpan(0, 0, Interval);
Timer.Tick += new EventHandler(Timer_Tick);
Timer.Start();
}
void Timer_Tick(object sender, EventArgs e)
{
WindowInteropHelper windowInteropHelper = windowInteropHelper = new WindowInteropHelper(this);
Screen screen = Screen.FromHandle(windowInteropHelper.Handle);
using (MemoryStream ms = new MemoryStream())
{
if (screen != null)
{
using (Bitmap bitmap = new Bitmap(screen.Bounds.Size.Width, screen.Bounds.Size.Height))
{
using (Graphics g = Graphics.FromImage(bitmap))
{
g.CopyFromScreen(screen.Bounds.X, screen.Bounds.Y, 0, 0, screen.Bounds.Size, CopyPixelOperation.SourceCopy);
}
ImageCodecInfo myImageCodecInfo;
myImageCodecInfo = GetEncoderInfo("image/jpeg");
System.Drawing.Imaging.Encoder myEncoder;
myEncoder = System.Drawing.Imaging.Encoder.Quality;
EncoderParameters encoderParameters = new EncoderParameters();
EncoderParameter encoderParameter = new EncoderParameter(myEncoder, 25L);
encoderParameters.Param[0] = encoderParameter;
bitmap.Save(ms, myImageCodecInfo, encoderParameters);
BitmapData = ms.ToArray();
OnChanged(EventArgs.Empty);
}
}
}
}
static ImageCodecInfo GetEncoderInfo(String mimeType)
{
int j;
ImageCodecInfo[] encoders;
encoders = ImageCodecInfo.GetImageEncoders();
for (j = 0; j < encoders.Length; ++j)
{
if (encoders[j].MimeType == mimeType)
return encoders[j];
}
return null;
}
public BitmapSource GetImage()
{
using (MemoryStream ms = new MemoryStream(this.BitmapData))
{
var decoder = BitmapDecoder.Create(ms, BitmapCreateOptions.PreservePixelFormat, BitmapCacheOption.OnLoad);
return decoder.Frames[0];
}
}
}
}
最適化されたコード:
namespace MyScreenGrabber
{
public delegate void ChangedEventHandler(object sender, EventArgs e);
public class ScreenGrabber : Window
{
public event ChangedEventHandler Changed;
protected virtual void OnChanged(EventArgs e)
{
if (Changed != null)
Changed(this, e);
}
byte[] BitmapData { set; get; }
int Interval { set; get; }
WindowInteropHelper windowInteropHelper;
Screen screen;
DispatcherTimer Timer { set; get; }
BackgroundWorker worker = new BackgroundWorker();
public ScreenGrabber(int interval)
{
Interval = interval;
windowInteropHelper = windowInteropHelper = new WindowInteropHelper(this);
screen = Screen.FromHandle(windowInteropHelper.Handle);
isDone = true;
Timer = new DispatcherTimer();
Timer.Interval = new TimeSpan(0, 0, Interval);
Timer.Tick += new EventHandler(Timer_Tick);
Timer.Start();
worker.DoWork += new DoWorkEventHandler(worker_DoWork);
worker.RunWorkerCompleted += new RunWorkerCompletedEventHandler(worker_RunWorkerCompleted);
}
void worker_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)
{
OnChanged(EventArgs.Empty);
isDone = true;
}
bool isDone;
void worker_DoWork(object sender, DoWorkEventArgs e)
{
GetScreenshot();
}
void Timer_Tick(object sender, EventArgs e)
{
if (isDone)
{
isDone = false;
worker.RunWorkerAsync();
}
}
void GetScreenshot()
{
using (MemoryStream ms = new MemoryStream())
{
if (screen != null)
{
using (Bitmap bitmap = new Bitmap(screen.Bounds.Size.Width, screen.Bounds.Size.Height))
{
using (Graphics g = Graphics.FromImage(bitmap))
{
g.CopyFromScreen(screen.Bounds.X, screen.Bounds.Y, 0, 0, screen.Bounds.Size, CopyPixelOperation.SourceCopy);
}
ImageCodecInfo myImageCodecInfo;
myImageCodecInfo = GetEncoderInfo("image/jpeg");
System.Drawing.Imaging.Encoder myEncoder;
myEncoder = System.Drawing.Imaging.Encoder.Quality;
EncoderParameters encoderParameters = new EncoderParameters();
EncoderParameter encoderParameter = new EncoderParameter(myEncoder, 25L);
encoderParameters.Param[0] = encoderParameter;
bitmap.Save(ms, myImageCodecInfo, encoderParameters);
BitmapData = ms.ToArray();
}
}
}
}
static ImageCodecInfo GetEncoderInfo(String mimeType)
{
int j;
ImageCodecInfo[] encoders;
encoders = ImageCodecInfo.GetImageEncoders();
for (j = 0; j < encoders.Length; ++j)
{
if (encoders[j].MimeType == mimeType)
return encoders[j];
}
return null;
}
public BitmapSource GetImage()
{
using (MemoryStream ms = new MemoryStream(this.BitmapData))
{
var decoder = BitmapDecoder.Create(ms, BitmapCreateOptions.PreservePixelFormat, BitmapCacheOption.OnLoad);
return decoder.Frames[0];
}
}
}
}
グッドポイントマン!私はちょうどバックグラウンドワーカーを追加し、それは完璧に動作します。 –